Warranty

This product is warranted against defects in material and workmanship for a period of two years from date of delivery. Maintenance items are not warranted. During the warranty period, The Armstrong Monitoring Corporation will repair or replace components that prove to be defective in the opinion of AMC. Any equipment deemed to be defective by the user should be returned to The Armstrong Monitoring Corporation for evaluation (see product return below). Site visits by Armstrong personnel, to evaluate/repair equipment, are not covered by this warranty unless covered under the site contract. AMC is not liable for auxiliary interfaced equipment, nor for consequential damage. This warranty shall not apply to any product which has been modified in any way, which has been repaired by any other party other than a qualified technician or authorized AMC representative, or when failure is due to misuse or conditions of use.

Note: Extended Warranty and mail in calibration programs are available (please call 1-800-465-5777) or see our contacts page at www.armstrongmonitoring.com

Liability

All AMC products must be installed and maintained according to instructions. Only qualified personnel should install and maintain the equipment. This product must not be placed in areas with combustible gases reaching 100% LEL (environments prone to explosions).

AMC shall have no liability arising from auxiliary interfaced equipment, for consequential damage, or the installation and operation of this equipment. AMC shall have no liability for labor or freight costs, or any other costs or charges in excess of the amount of the invoice for the products.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED AND SPECIFICALLY THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE DESCRIPTION ON THE FACE THEREOF.

Product Return

All products returned for warranty or service should be shipped by prepaid freight and will be accepted only with RMA or repair number issued by AMC.

Contact Information

For information, please call 1-800-465-5777, visit www.armstrongmonitoring.com or email directly support@armstrongmonitoring.com.

Modifications And Substitutions

Due to an ongoing development program, AMC reserves the right to substitute components and change specifications at any time without incurring any obligations.

Glossary

AMC-ATx Transmitter Specifications

Product Description

The AMC-ATx serves continuous, reliable monitoring of ambient air for target gas(es) via onboard sensor modules. 

Plug-and-play modular architecture accommodates; hot-commissioning and field replaceable Sensor Modules (eligible for the EZ-CAL exchange program). 

In addition, each transmitter features alarm/system status indicators, an on-board relay and colour-coded connection terminal blocks, as listed and described herein. 

Product Order Numbers

External View

Internal View

Sensor Module Specifications

Accessories

Calibration Kit

The Calibration Kit, as shown below, consists of the AMC-FM2 Calibration Adaptor that secures the calibration gas hose to the front of the Sensor Module along with a hose to connect to the calibration gas cylinder regulator.

Weathershield

NOTE: The Weathershield assembly is compatible with both wall and pole mounting configurations. To install the Weathershield follow these steps:

Place the Bracket Assembly behind the Transmitter.

Mount the Bracket Assembly, and Transmitter to the wall or pole. (Mounting Screws NOT Included).

Place the Weathershield over the bracket. The side screws fit into the slots. Tighten the screws to hold the Weathershield in place.

Vandal Guard

NOTE: The Vandal Guard assembly is only compatible with wall mounting configurations. To install the Vandal Guard, follow these steps:

Mount the Transmitter to the wall. (Mounting Screws not included).

Connect all wiring to the Transmitter.

Mount the Vandal Guard to the wall. (Mounting Screws NOT Included). NOTE: Mounting hole is 0.25 inch (6.3mm) diameter and are on an 8.0” W x 4.38” H (200mm x 110mm) pattern.

Pole Mounting Brackets

Overview

NOTE: All Armstrong Monitoring systems must be installed and maintained according to instructions to assure proper operation. Only qualified personnel should install and maintain the equipment. For exchange, re-calibration or extended warranty programs information please call 1-800-465-5777 or through contacts at www.armstrongmonitoring.com

The installation is very important as the operational effectiveness is a direct result of the quality of the installation. The following sections provide guidelines for installation, location and mounting, wiring, and cable selection.

Transmitter Mounting

Mount the device on a solid, non-vibrating surface or structure. Mount in an area where the ambient concentration of gas is not directly affected by the presence of a clean air supply, ventilation systems, or blockage by surrounding articles. Locate away from sources of interference gases. If the main objective is the fastest possible leak detection, mount the sensor near the potential leak sources. Please refer to local codes for installation information. The installer is required to provide any mounting hardware that may be required.

In order to mount the device:

1. Remove cover.
2. Mount housing using defined mounting holes. See the Enclosure Mounting figure and Enclosure Pole Mounting figure.
3. Drill holes for conduit and then install conduit. See WARNING below.
4. Re-attach cover and bracket.

WARNING:

The transmitter should not be placed near cleaning products/solvents, particularly ones that contain alcohol. This can permanently damage sensor elements or cause negative output values.

Conduit should enter the housing from the bottom to ensure best protection against ingress of condensation.

Conduit entry from the top or back of the housing is Not Recommended. Any water damage related to conduit entry from the top or back will not be covered under warranty.

Qualified personnel should perform the installation according to all applicable electrical codes, regulations and safety standards. Ensure correct cabling practices are implemented.

Mount all equipment away from any source of electro-magnetic interference (EMI) or radio frequency interference (RFI) such as power transformers, electric motors, etc.

Equipment must be positioned such that the change of water damage is minimized; Example away from fire suppression sprinkler heads, away from wet or damp locations where there would be risk of water damage.

Ensure a balanced layout of sensors to cover the intended area. Refer to the Accessory Mounting section if the transmitter is to be mounted on a pole, in a location where water spraying or splashing could be an issue, or in locations where a vandal guard is required.

NOTE: Mount enclosure as shown in the below Enclosure Mounting figure. This will ensure correct orientation.

Wiring

End Of Line

EOL termination is a critical requirement for the last unit of the bus when configured as ‘Multidrop’. Without this termination, the transmitters (communicating via ‘Multidrop’) closer to the monitor will incorrectly report Alarm levels and the system will remain in a ‘Fault’ condition.

The EOL jumper located at the rear of the lid has two possible positions to enable (ON) or disable (OFF) the EOL option as shown below. The jumper needs to be inserted into one of these two positions.

To change EOL settings on the ATx, you must:

1. Remove Power.
2. Open Lid.
3. Update the position of the EOL jumper based on the bus position of the unit.

Multidrop Communication

Input and Output Magnitudes in Various Conditions in Current or Voltage Mode:

Operation condition	Voltage Mode (VDC)	Current Mode (mA)
Fail	<0.5	<2
Normal	0.5-1.5	2-6
Low Alarm	1.5-2.5	6-10
High Alarm	>2.5	>10

Connection between the Monitor and the ATx should be made using 3-conductor, shielded cable (shield must be grounded at the monitor). Run cable through steel conduit for best signal transmission and maximum noise rejection. A maximum length of 150 feet of 18 AWG size cable is recommended between each module as well as between the monitor and first module. For other distances or cable sizes, consult with The Armstrong Monitoring Corporation

Each ATx is designed to interconnect to other modules in series configuration. Since each module is pre-calibrated, additional modules can be added to a system without altering the monitor settings. When multiple modules are interconnected, the EOL switch is in the off position except for the last one.

The analog input terminal blocks are used for connecting the ATx in Voltage Mode. The wiring is conveyed in the following table.

Gas Monitor	ATx
Chassis Ground	Connect to the cable shield
Negative -	Negative -
Signal S	Signal S
Positive +	Positive +

Overview

This section describes each sub-system of the AMC-ATx.

Status LEDs

Refer to the Product Description section for LED locations and descriptions. During operation the LEDs will display the following configurations:

Overview

Note that a Menu Flow Chart is available further in this manual. The menu images and menu flow diagrams in this manual represent gas types with labels such as “GAS1”, “GAS2”, etc. These are mapped to specific gases based on the customer order.

Normal Operation

Upon startup, a brief splash screen is shown on the display which includes the Armstrong Monitoring Corp’s logo and the current version of firmware. After a couple of seconds, the display will update to show the main info screen (see below). NOTE: The gas reading is not visible initially while the sensor modules are warming up. The warm-up period will be shown in the details section for the selected sensor until the warm-up period expires. NOTE: Factory configurations define a warm-up default value that prevents false alarms while sensors are warming up. This value may be viewed during warm-up through the detailed sensor screen section.

As shown above, two sensors are currently attached to the transmitter. Only one sensor can be selected at a time for the purpose of inspecting its details. Use the UP and DOWN buttons to navigate between each sensor. The following diagram illustrates the main info screen after pressing the DOWN button from the previous display. Notice how the details are updated to reflect the newly selected sensor.

After a programmed timeout period without any button presses, the display will go blank (screen saver mode). To re-enable the display, simply press the ENTER button.

Failed Sensor

In the event of a failed sensor, the sensor’s gas reading is replaced with a large FAULT indication, and the detailed description is updated accordingly. If the sensor fails while the display is OFF, the display will immediately turn ON and the failed sensor will be selected by default. In addition, the FAULT indication will toggle between normal and inverse video mode at a rate of once per second as shown below.

If the fault condition is resolved, the main display for the failed sensor will resume normal operation by indicating the sensor’s current gas reading.

Warning And Alarm Indication

When a warning or an alarm occurs, the sensor’s gas reading is replaced with a large WARN indication for warnings or a large ALARM for alarms. If the sensor enters a warning or alarm state while the display is OFF, the display will immediately turn ON and the sensor responsible for the warning/alarm will be selected by default. Similar to the FAULT indication, the WARN/ALARM indication will toggle between normal gas reading and inverse video mode for the alarm status at a rate of once per second as shown below.

For units configured at factory to use latched alarms, when the alarm condition is cleared the display will indicate that the relays are latched until cleared by the user by pressing the ENTER button to release the latching condition.

Fault Indication

The following two menu images show a fault condition in normal and inverse video modes.

Detailed Information Screens

Press the UP and DOWN buttons to select the desired sensor then press the ENTER button to access the detailed status screen for the selected sensor.

The detailed status screen (page 1 of 2) provides the sensor and calibration status of the selected sensor. Use the UP or DOWN buttons to page to the detailed sensor screen.

The detailed sensor screen (page 2 of 2) provides a list of aggregated sensor readings as well as the current sensor reading. Use the UP or DOWN buttons to page to the detailed status screen.

Either of these two screens will timeout after 300 seconds if no button is pressed thereby turning the display OFF. Alternatively, the user can exit these detailed screens on demand by pressing the ENTER button to return to the main info screen.

Firmware Info Screen

To access the firmware info screen, press and hold the DOWN button until the following screen appears.

Quick Info Screen

To access the quick info screen, press and hold the UP button until the following screen appears. 

The quick info screen provides the bus voltage supplied to unit (V), temperature (ºC and ºF), pressure (Pa), and relative humidity (%RH), or "N/A" if not available. 

The user can exit the quick info screen by pressing the ENTER button to return to the main info screen. 

Password Entry

To access the service menu system, the user needs to press and hold the ENTER button while the main info screen is active until the following password entry screen is displayed.

Enter the password using a combination of the UP, DOWN and ENTER buttons. The password is factory set to UP - DOWN - UP - DOWN - ENTER – ENTER. As the password is being entered, the display updates with each button press. The screen below illustrates the state of the password entry after 3 button presses. The password entry screen will timeout after 10 seconds if no button is pressed thereby returning the user back to the main info screen.

Main Menu

Top Level

Once the correct password is entered, the main service menu is displayed as shown in the following screen.

Once again, the UP and DOWN buttons can be used to navigate the list of service menus. The main service menu provides the menu items listed in the table below:

Menu Item	Description
<Sensor #>: <Gas Label>	Each sensor is included in the service menu indicated by its number and gas label (Ex: S2: CO).
ATx	Access the settings for the transmitter module through the ‘ATx’ menu item.
Exit	Select this menu item to exit the service menu.

To exit the Service Menu, press DOWN repeatedly until the end is reached and Exit is highlighted as shown below.

With ‘Exit’ highlighted (as above), press ENTER to exit the service mode and return back to the main info screen as shown below. Alternatively, press and hold the ENTER button for a period of 2 seconds will also return the user to the main info screen.

Sensor Menu

Calibration Procedure

Navigate to the Service Menu and select the sensor to be calibrated. If the ENTER button is pressed, then the following menu is shown. This menu is common to all sensor modules, therefore selecting any sensor will produce the same menu.

Note that during ADAPTiCal a timeout during the buffering, find zero, background confirmation, or find gas step will result in automatic return to the Service Menu.

The UP and DOWN buttons can be used to navigate the list of service menus for the selected sensor. The sensor’s service menu provides the following menu items:

Menu Item	Description
ADAPTiCal	Select this menu item to start calibration for the selected sensor.
As Found	Allows user to enter the background concentration reading before performing a bump test. (Refer to the As Found section below for further explanation).
Reset	Allows user to trigger a software reset of the selected sensor.
Exit	Select this menu item to return to the main service menu. The current sensor will be selected when the main service menu appears.

With ‘ADAPTiCal’ highlighted (as above), press ENTER to initiate a calibration sequence for the selected sensor. Once initiated, the user will be presented with the following screens in which the background and span level concentrations used for the calibration can be entered:

Once the background and span level gas concentrations are entered, the calibration procedure will start automatically, and the state of the calibration will be displayed on the display as shown below. Throughout the entire calibration procedure, the Abort command remains highlighted therefore the procedure can be aborted at any time by pressing the ENTER button.

During calibration, the procedure will transition through the following set of states:

Menu Item	Description
Buffering	A software register is acquiring data before the gas level can be evaluated.
Find Zero	The gas concentration for ‘zero’ gas is determined.
Background Confirmation	Procedure is ready for the user to apply gas. User will be prompted to press the ENTER button after the OK command is highlighted to indicate when they have applied gas, or Abort if the estimated background reading disagrees with portable unit.
Find Gas	Calibration routine will stay in this state until it has detected the full application of gas.
Find Span	Calibration is underway with the specified gas applied. This state will remain active until it either passes or fails.

When the calibration procedure completes its cycle, the result will either be a PASSED or FAILED with calibration results as shown by the following two images.

In either case, the OK command is highlighted, therefore, press the ENTER button to return to the sensor’s service menu. 

Calibration Procedure Tips

Note: If an “As Found” (Bump Test) is to be performed prior to calibration, first follow the routine outlined in the As Found section.

• To begin calibration, go to the menu, and select the sensor to be calibrate, then select “ADAPTiCal”. Refer to the above Calibration Menu section for details.
• The operator will be asked to provide a background gas concentration. Use the arrow keys to adjust the rightmost digit while pressing enter to commit each digit. Repeat this for all digits.
• It is recommended that prior to calibration to manually set the ventilation system to reduce the background gas concentration to near zero.
• It is recommended to use a trusted secondary measurement device (such as a handheld gas meter) to obtain an accurate reading of the background gas concentration. Enter this value for the background gas concentration when prompted.
• If background gas concentration cannot be reduced to near zero or if the background gas concentration cannot be established, apply pure nitrogen gas to the sensor prior and during the finding zero stage of calibration. Enter 0 for the background gas concentration when prompted.

CAUTION:

In the case of repeated CO Gas Calibrations performed in quick succession (i.e. less than 30 minutes apart) first follow the routine outlined in the ‘As Found’ section. Then use the Background value provided by the unit during ADAPTiCal startup.

A CO sensor element has a tendency to increase its background zero offset after each span gassing. Entering a Background of 0.0 in the second or third attempt can lead to failed calibration.

• The operator will then be asked to provide a span level gas concentration (i.e. the concentration of the target gas that is in the cylinder being used to calibrate). Use the arrow keys to adjust the rightmost digit while pressing enter to commit each digit. Repeat this for all digits.
• It is recommended that this concentration be relatively close to the maximum span range of the sensor for best results (as an example, service technicians could use 75ppm gas concentration cylinder for calibrating 100ppm CO Span sensor, however we recommend 100ppm CO).
• The sensor will enter buffering and the “Find Zero” stage of calibration, assessing the output at the background concentration. When this stage succeeds, the operator will be notified on screen, and the calibration routine will pause until it is acknowledged. Before acknowledging, get the target span gas ready to flow. When ENTER is pressed, start applying the gas.
• The sensor will wait until it detects gas and will enter the “Find Span” stage of calibration. This typically takes between 30 and 180 seconds.
• Once this stage succeeds, the sensor will check that the result is within limits and notify the operator whether the calibration routine has failed or succeeded. The operator maybe be notified if sensor is nearing end of life.
• If the calibration fails, the calibration can be attempted again right away, but it is recommended that the operator accepts the background gas concentration provided by the unit since the unit will retain the original background gas concentration.

As Found

Before calibration, a bump test ("as found test”) is usually performed to ensure each sensor is in working order and returning reasonable responses. The bump test involves applying a test gas to the sensor. However, sensors such as CO have a recovery time measured in multiple hours. As a result, the calibration routine would find a zero at a concentration that is not the true background concentration, should the sensor not have sufficient recovery time.

The “As Found” menu item (see below Menu Flow Diagrams section for Sensor Service Menu Flow Diagram figure) allows the user to enter the measured background concentration before performing a bump test. This value is persisted in memory for 24 hours. If a calibration is performed during this 24h period, the persisted background concentration will be used to negate the effect of the bump test and sensor recovery time on the calibration process.

Before performing a bump test, navigate to the “As Found” menu and enter the current background reading. The user should then navigate to the main screen so that the gas concentration may be monitored during the bump test. The user may then apply a test gas and monitor the response.

Reset Sensor

From the sensor’s service menu, press ENTER with the ‘Reset’ menu selected as shown below to initiate a software reset the selected sensor.

Service Menu

Overview

If the ‘ATx’ menu item is activated from the main service menu via the ENTER button, then the device service menu will appear on the display as shown in the following diagram.

The UP and DOWN buttons can be used to navigate the list of service menus for the ATx. The following table outlines all the menu items from the ATx menu:

Menu Item	Description
Sensors	Select this menu item to activate the Sensors sub-menu.
Alarms	Select this menu item to activate the Alarms sub-menu.
Relays	Select this menu item to activate the Relays sub-menu.
Inputs	Select this menu item to activate the Inputs sub-menu.
Outputs	Select this menu item to activate the Outputs sub-menu.
Test	Select this menu item to toggle the test enable flag.
Date	Select this menu item to adjust the current date - year, month, and day.
Time	Select this menu item to adjust the current time - hour and minute.
Reset	Select this menu item to trigger a software reset of the ATx.
Exit	Select this menu item to return to the main service menu. The menu item for the ATx will be selected when the main service menu appears.

Sensor Settings

From the service menu, selecting ‘Sensors’ will update the display to show the following sub-menu.

The UP and DOWN buttons can be used to navigate the list of menu items for the transmitter sensors sub-menu. The table below outlines all the menu items from the sensors sub-menu:

Menu Item	Description
S1: <Gas Label>	Select this menu item to activate the configuration sub-menu for sensor 1.
S2: <Gas Label>	Select this menu item to activate the configuration sub-menu for sensor 2.
Exit	Select this menu item to return to the service menu.

Selecting a sensor from the service menu will update the display to show the following sub-menu.

The UP and DOWN buttons can be used to navigate the list of menu items for the sensor configuration sub-menu. The table below outlines all of these menu items:

Menu Item	Description
Zero Buff	Select this menu item to edit the zero-buffer level for the display of small gas concentrations.
Cal Freq	Select this menu item to edit the time period between re-calibrations.
Override	Select this menu item to access the sensor override sub-menu for the selected sensor.
Exit	Select this menu item to return to the Sensors sub-menu.

Zero Buffer

If ‘Zero Buff’ is activated, the display will be updated to show the following editing screen.

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the Zero Buffer for the selected sensor. Otherwise, the edit value is rejected. In either case, the menu returns to the Sensor Configuration sub-menu menu with the ‘Zero Buff’ menu item selected.

Calibration Frequency

If ‘Cal Freq’ is activated from the Sensor Configuration sub-menu, then the display will be updated to show the following editing screen.

The available options for ‘Cal Freq’ are listed in the table below.

Menu Item	Description
OFF	Next calibration due date is not calculated.
3 Months	Next calibration due date is calculated as 3 months from last calibration timestamp.
4 Months	Next calibration due date is calculated as 4 months from last calibration timestamp.
6 Months	Next calibration due date is calculated as 6 months from last calibration timestamp.
12 Months	Next calibration due date is calculated as 12 months from last calibration timestamp.

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the Calibration Period for the selected sensor. Otherwise, the edit value is rejected. In either case, the menu returns to the Sensor Configuration sub-menu menu with the ‘Cal Freq’ menu item selected.

Sensor Override

If ‘Override’ is activated from the sensor’s service menu, then the display will be updated to show the following sub-menu. 

If ‘Sim Enable’ is activated from the ‘Override’ sub-menu, then the display will be updated to show the following editing screen. 

When the ENTER button is pressed, the confirmation screen (described previously) is displayed. If ‘Yes’ is selected, the edit value is persisted as the new value for the Sim Enable Flag. Otherwise, the edit value is rejected. In either case, the menu returns to the Override sub-menu menu with the ‘Sim Enable’ menu item selected. 

If ‘Sim Gas’ is activated from the ‘Override’ sub-menu, then the display will be updated to show the following editing screen. 

When the ENTER button is pressed with the last digit highlighted, the confirmation screen (described previously) is displayed. If ‘Yes’ is selected, the edit value is persisted as the new value for the Sim Gas concentration value. Otherwise, the edit value is rejected. In either case, the menu returns to the Override sub-menu menu with the ‘Sim Gas’ menu item selected. 

Selected ‘Exit’ from the ‘Override’ sub-menu returns the user to the Sensor Configuration sub-menu with the ‘Override’ menu item selected. 

Alarms Settings

From the service menu, selecting ‘Alarms’ will update the display to show a selection of Sensor inputs, allowing the user to edit their respective alarms.

The UP and DOWN buttons can be used to navigate the list of menus for the Alarms sub-menu. The table below outlines all the menu items from the Alarms sub-menu:

Menu Item	Description
S1: <Gas Label>	Select this menu item to activate the alarm configuration sub-menu for sensor 1.
S2: <Gas Label>	Select this menu item to activate the alarm configuration sub-menu for sensor 2.
Exit	Select this menu item to return to the service menu. The alarms menu item will be selected when the service menu appears.

Selecting a sensor from the transmitter alarms sub-menu (ex: S1: GAS1) will update the display to show the following sub-menu.

The UP and DOWN buttons can be used to navigate the list of menus for the ‘Sensor Alarms’ sub-menu. The below table outlines all the menu items from the sensor sub-menu:

Menu Item	Description
ALARM 1-3	Select this menu item to edit the alarm configuration for the selected alarm (1-3).
ALARM HYST	Select this menu item to edit the alarm hysteresis. This hysteresis value is applied to all alarms for the selected sensor.
Exit	Select this menu item to return to the Alarms sub-menu.

Selecting an alarm from the sensor alarms sub-menu will update the display to show the following:

The below table outlines all the menu items from the alarm sub-menu:

Menu Item	Description
Threshold	Select this menu item to edit the alarm’s threshold.
Level	Select this menu item to edit the alarm setpoint.
Input	Select this menu item to edit the alarm input value.
Type	Select this menu item to edit the alarm type (increasing or decreasing).
Output	Select this menu item to edit the alarm trigger output (i.e. activate which relays).
Act Delay	Select this menu item to edit the alarm act delay in terms of seconds.
Min Run	Select this menu item to edit the alarm minimum run time in terms of seconds.
Exit	Select this menu item to return to the sensor alarm configuration sub-menu.

Threshold

If ‘Threshold’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed, the confirmation screen (described previously) is displayed. If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s threshold value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Threshold’ menu item selected. 

Level

If ‘Level’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

The available options for ‘Level’ are listed in the below table:

Menu Item	Description
None	Alarm is not evaluated.
Warning	If alarm threshold is exceeded, alarm state will be ‘Warning’
Alarm	If alarm threshold is exceeded, alarm state will be ‘Alarm’
High Alarm	If alarm threshold is exceeded, alarm state will be ‘High Alarm’

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s level value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Level’ menu item selected. 

Input

If ‘Input’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

The available options for ‘Input’ are listed in the below table:

Menu Item	Description
Inst. Value	Instantaneous gas value, updated once per second.
15m Avg	Gas concentration averaged over the past 15 minutes.
8h Avg	Gas concentration averaged over the past 8 hours.
Daily Peak	Daily peak value.

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s input value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Input’ menu item selected. 

Type

If ‘Type’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

The available options for ‘Type’ are listed in the below table:

Menu Item	Description
Increasing	Alarm is triggered when alarm exceeds its threshold in an increasing direction.
Decreasing	Alarm is triggered when alarm exceeds its threshold in a decreasing direction.

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s type value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Type’ menu item selected.

Output

If ‘Output’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed with ‘Done’ selected, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s output value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Output’ menu item selected.

Act Delay

If ‘Act Delay’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed while the last digit is highlighted, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s activation delay value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Act Delay’ menu item selected.

Min Run

If ‘Min Run’ is activated from the alarm configuration sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed while the last digit is highlighted, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the selected alarm’s minimum run value. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Min Run’ menu item selected.

Alarm Hysteresis

Selecting the ‘ALARM HYST’ menu item from the sensor alarms sub-menu will update the display to show the following:

When the ENTER button is pressed while the last digit is highlighted, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the alarm hysteresis which applies to all alarms associated with the selected sensor. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘ALARM HYST’ menu item selected.

Relay Settings

From the service menu, selecting ‘Relays’ will update the display to show the following sub-menu.

The UP and DOWN buttons can be used to navigate the list of menus for the Relays sub-menu. The following table outlines all the menu items from the Relays sub-menu:

Menu Item	Description
Local	Select this menu item to activate the configuration sub-menu for the local relay.
Exit	Select this menu item to return to the service menu. The Relays menu item will be selected when the service menu appears.

Selecting the local relay from the Relays sub-menu will update the display to show the following:

The following table outlines all the menu items from the relay sub-menu:

Menu Item	Description
Polarity	Select this menu item to edit the relay’s polarity setting.
Exit	Select this menu item to return to the Relays sub-menu.

Polarity

If ‘Polarity’ is activated from the relay sub-menu, then the display will be updated to show the following editing screen.

The available options for ‘Polarity’ are listed in the following table.

Menu Item	Description
Normal	Relay output is energized when associated alarm is active. Otherwise, the relay output is de-energized.
Reverse	Relay output is de-energized when associated alarm is active. Otherwise the relay output is energized.

When the ENTER button is pressed, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is persisted as the new value for the polarity of the local relay. Otherwise, the edit value is rejected. In either case, the menu returns to the alarm configuration sub-menu with the ‘Polarity’ menu item selected.

Date

From the service menu, selecting ‘Date’ will update the display to show the following screen:

When the ENTER button is pressed when the last digit is highlighted, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is recorded as the new current date. Otherwise, the edit value is rejected. In either case, the menu returns to the service menu with the ‘Date’ menu item selected. 

Time

From the service menu, selecting ‘Time’ will update the display to show the following screen:

When the ENTER button is pressed when the last digit is highlighted, the screen will update to display the confirmation dialog (described previously). If ‘Yes’ is selected, the edit value is recorded as the new current time. Otherwise, the edit value is rejected. In either case, the menu returns to the service menu with the ‘Time’ menu item selected. 

Reset Transmitter

From the service menu, press ENTER with the ‘Reset’ menu selected as shown below to software reset the ATx.

General

Maintenance is a crucial activity that should be done at the proper time intervals, which are discussed below.

The device should be brushed or wiped as required, depending on the rate of accumulation of any dust or dirt.

To avoid sensor damage, the unit MUST NOT be submerged in any liquids. Hosing or splashing of the unit with any liquids must also be avoided.

Ensure the green indicators (LEDs) indicate a healthy state.

Calibration Overview

Sensors naturally degrade over time and will start to underreport gas concentrations, meaning that a calibration is necessary to maintain a safe environment. 

When the unit is due for calibration the Sensor Module LED will blink CYAN-YELLOW as opposed to its usual green to be able to see at a glance which sensor(s) is(are) overdue.

Information on Calibration Dates (when calibration is due, calibration frequency) can be found in the Transmitter Menu.

Caution:

• Only qualified personnel should perform the actual calibration.
• Users new to gas calibration are advised to consult with Armstrong Monitoring.

The Armstrong Monitoring Corporation offers the following calibration plans:

• Factory pre-calibrated exchange replacement of Sensor Modules.
• On site installation by Armstrong Monitoring.
• Training by Armstrong Monitoring for end users.

For additional details, please refer to the Contact Information section.

Scheduled Calibration

Scheduled calibration is critical in maintaining proper function. It is recommended that the Sensor Module(s) be calibrated a minimum of twice a year or more often for demanding workplace applications. As mentioned, Armstrong Monitoring Corporation offers a number of different maintenance plans to suit your requirements. Please see the above Contact Information section for more details.

Required Equipment

The following is a recommended list of equipment required:

For qualified personnel, the following is recommended calibration gas for calibration of the AMC-Sensor module:

Note:

Safe handling ceiling limit should be considered for all gas calibrations. Please contact your local regulatory authority for more information.

Calibration gas concentrations above 105ppm CO for 100ppm CO Sensors and 315ppm CO for 300ppm CO Sensors are not supported.

For NO₂ Sensors, calibration gas concentrations greater than 10.5ppm are not supported.

Please refer to the Calibration Kit section for the Calibration Kit that provides the mating adaptor for connecting the calibration gas cylinder to the face of the Sensor Module.

Sensor Module

Sensor Module Replacement

Sensor Modules are designed to be field replaceable. When changing the sensor module, first ensure that the unit is fully powered down.

Remove Sensor Module

Detach the cable to the top connector on the Sensor Module.

Rotate the Sensor Module so the tab aligns as shown and remove from the Lid Assembly.

Install Sensor Module

To install the replacement Sensor Module, assemble the Sensor Module to the Lid Assembly:

Rotate the Sensor Module so the tab aligns as shown.

Push and turn clockwise until the Sensor module is secured.

Attach the Cable to the top connector on the Sensor Module.

Verification Of Operation

Simulation Of Gas Levels

The Sensor Configuration Menu for a selected sensor allows the current gas reading to be overridden by a simulated gas level. This may be useful during system configuration to verify operation of the Digital Monitor or alarm relays.

If ‘Override’ menu item is activated from the sensor’s configuration menu, then the display will be updated to show the following sub-menu.

If ‘Sim Enable’ is activated from the ‘Override’ sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed, the confirmation screen (described previously) is displayed. If ‘Yes’ is selected, the edit value is persisted as the new value for the Sim Enable Flag. Otherwise, the edit value is rejected. In either case, the menu returns to the Override sub-menu menu with the ‘Sim Enable’ menu item selected.

If ‘Sim Gas’ is activated from the ‘Override’ sub-menu, then the display will be updated to show the following editing screen.

When the ENTER button is pressed with the last digit highlighted, the confirmation screen (described previously) is displayed. If ‘Yes’ is selected, the edit value is persisted as the new value for the Sim Gas concentration value. Otherwise, the edit value is rejected. In either case, the menu returns to the Override sub-menu menu with the ‘Sim Gas’ menu item selected.

Selected ‘Exit’ from the ‘Override’ sub-menu returns the user to the sensor’s configuration menu with the ‘Override’ menu item selected.

Test Outputs

The Test Menu allows the activation of all relays and LEDs, regardless of alarm state. This may be useful during system configuration to verify operation of the LEDs and relays, as well as to verify that the polarity settings are correct.

From the service menu, selecting ‘Test’ will update the display to show the following:

When the ENTER button is pressed, the confirmation screen (described previously) is displayed.

In addition to activating all relays (taking into account polarity settings), the display LEDs will appear SOLID GREEN and all sensor LEDs will appear SOLID WHITE, if functional.

Symptoms And Corrective Actions

Errata

The following issues have been identified in this release of the system. These will be addressed in future updates.

Default Alarm Settings

Each sensor can have up to three separate alarm levels associated with its gas reading. These alarms are evaluated is ascending order (Alarm 1 through Alarm 3) therefore, it is expected that the alarms are specified in descending order with respect to severity In the following table, the setpoint for each alarm is specified as well as the alarm level in parathesis (HA = High Alarm, A = Alarm, W = Warning, N = None).

Default Sensor Module Settings

Main Screen / Password Flow

ATx Service Menu

Sensor Service Menu

Sensor Configuration Menu

Alarm Menu

Document Revision History