AMC AMC-1225 User manual

1225
Sensor Modules
INSTRUCTIONS
Installation and Operation of the
AMC-1225 Sensor Modules For Use With AMC
Gas Monitors
IMPORTANT:
Please read these installation and operating instructions completely
and carefully before starting.
filename: 3573405B, DOC, AMC1225 Manual.doc
Copyright ©, August 2018, AMC
The Armstrong Monitoring Corporation
215 Colonnade Road South, Ottawa, Ontario, Canada K2E 7K3
Tel: [phone] • Fax: [phone] • U.S. & CANADA Toll Free: [phone]
E-mail: [email protected] • Internet: www.armstrongmonitoring.com/gas/

AMC-1225 SENSOR MODULES
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TABLE OF CONTENTS
Section Title Page
1WARRANTY..........................................................................................................................2
1.1LIABILITY.......................................................................................................................2
1.2MODIFICATIONS AND SUBSTITUTIONS.....................................................................2
1.3PRODUCT RETURN......................................................................................................2
2PRODUCT INFORMATION...................................................................................................3
2.1AMC-1225 SENSOR MODULES ...................................................................................3
2.2FACTORY CALIBRATION .............................................................................................4
3PRODUCT DESCRIPTION ...................................................................................................5
3.1GENERAL DESCRIPTION.............................................................................................5
3.1.1INTERNAL FEATURES ..........................................................................................5
4INSTALLATION ....................................................................................................................7
4.1LOCATION AND MOUNTING........................................................................................7
4.1.1MOUNTING.............................................................................................................7
4.2CABLE SELECTION AND WIRING ...............................................................................9
4.2.1MULTI-UNIT INTERCONNECTION......................................................................10
4.2.2TERMINATION......................................................................................................10
5OPERATION AND CALIBRATION.....................................................................................12
5.1OPERATION ................................................................................................................13
5.1.1ALARM CONDITIONS ..........................................................................................13
5.1.2FAULT SUPERVISION .........................................................................................13
5.2CALIBRATION..............................................................................................................13
5.2.1SETTING UP CHAMBER AND APPLYING GAS....Error! Bookmark not defined.
5.2.2ADJUSTMENTS....................................................................................................13
6MAINTENANCE ..................................................................................................................16
6.1GENERAL ....................................................................................................................16
6.2VERIFICATION OF OPERATION ................................................................................16
6.3SENSOR REPLACEMENT ..........................................................................................16
Figure 2-1 AMC-1224, 1225 Sensor Modules ..............................................................................3
Figure 3-1 Internal Features of the AMC-1224, 1225 Sensor Module..........................................6
Figure 4-1 Hole Mounting .............................................................................................................8
Figure 4-2 Pole Mounting..............................................................................................................9
Figure 4-3 Detail Wiring of Sensor Modules...............................................................................11
Figure 4-4 Typical System Configuration Layouts......................................................................12
Figure 5-1 Calibration/Verification set-up procedure ..................................................................15

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1WARRANTY
AMC-1225 Modules are warranted against defects in material and workmanship for a period of
one (1) year from date of delivery. During the warranty period, The Armstrong Monitoring
Corporation will repair or replace components that prove to be defective in the opinion of AMC.
We are not liable for auxiliary interfaced equipment, or 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
such failure is due to misuse or conditions of use.
1.1 LIABILITY
All AMC products must be installed and maintained according to instructions. Only qualified
technicians should install and maintain the equipment. 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 labour 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.
1.2 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.
1.3 PRODUCT RETURN
All products returned for warranty service will be by prepaid freight and they will only be
accepted with a repair number issued by AMC. All products returned to the client will be freight
collect.
WARNING
USING ELECTRICALLY OPERATED EQUIPMENT NEAR GASOLINE, OR GASOLINE
VAPOURS MAY RESULT IN FIRE OR EXPLOSION, CAUSING PERSONAL INJURY AND
PROPERTY DAMAGE. CHECK TO ASSURE THE WORKING AREA IS FREE FROM SUCH
HAZARDS, AND USE PROPER PRECAUTIONS.

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2PRODUCT INFORMATION
Figure 2-1 AMC-1225 Sensor Modules
2.1 AMC-1225 SENSOR MODULES
Sensor Module Part Number ……………………………
Sensor Module Serial Number ………………………….
Sensor Element Part Number………………….………..
Sensor Element Serial Number ………………………...
Wire Gauge ………………………………………………. 18 AWG @ 150 ft max between units
Power Supply Requirement …………………………….. 6 to 30 VDC
Operating Temperature …………………………………. 0 to 40 C
Operating Pressure ……………………………………… Ambient atmospheric pressure
Humidity …………………………………………………... 0 to 99% RH, non-condensing

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2.2 FACTORY CALIBRATION
Gas type ……………………………………………………………
Low Alarm Setting ………………………………………………...
High Alarm Setting ………………………………………………..
Calibration Mixing Chamber Part Number………………………
Note:
All Armstrong Monitoring systems must be installed and maintained according to
instructions, to ensure proper operation. Only qualified technicians should install and
maintain the equipment. Qualified personnel should perform the installation according to
applicable electrical codes, regulations and safety standards. Insure correct cabling
practices are implemented.

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3PRODUCT DESCRIPTION
In this section a general product description is given followed by a detailed list of the AMC-1224,
1225 unit’s internal features.
3.1 GENERAL DESCRIPTION
The AMC-1225 sensor unit provides continuous, reliable surveillance of surrounding air for
traces of hazardous gases that are listed in the Product Information Section. This unit is
designed to allow interconnection in series as in a “daisy chain” configuration (refer to Figure
4-3) to a single or multi-channel AMC-1A series monitor or so equipped inputs of other AMC
Gas Monitors. A maximum of eight (8) sensors can be connected to each zone. The units can
also be branched out from the central line allowing maximum flexibility. Each unit provides Low
alarm, High alarm and sensor Fail signals, which are transferred from one sensor to the next
down the line back to the monitor.
3.1.1 INTERNAL FEATURES
Each sensor module features alarm indicators, adjustment trimmers and connection terminal
blocks as listed and described below.
1) SENSOR: Long life solid state, no maintenance, factory calibrated
2) HIGH ALARM INDICATOR: High levels of gas are indicated by an illuminated red
LED.
3) LOW ALARM INDICATOR: Low levels of gas are indicated by an illuminated yellow
LED.
4) POWER / FAIL INDICATOR: Power is indicated by an illuminated green LED. A
sensor failure causes the green LED to turn OFF.
5) HIGH ALARM ADJUSTMENT: Sets the high alarm trip point.
6) LOW ALARM ADJUSTMENT: Sets the low alarm trip point.
7) SIGNAL ADJUSTMENT: Sets the sensitivity of the sensor.
8) TERMINATING JUMPERS: Jumper clips are supplied installed on the circuit card.
When connecting additional sensor modules, the jumper clip corresponding to the
terminal block must be removed. Refer to section 4.2.2 TERMINATION for more
details.
9) OUTPUT TERMINAL BLOCK: The output terminal block, labeled (-,s,+), connect to
the (-,s,+) terminals in the monitor, or to the input (-,s,+) terminals of another sensor
module.
10)INPUT TERMINAL BLOCKS: The input terminal blocks, labeled (-,s,+), are used to
connect additional sensor modules. Each unused input terminal block must be
locked-out using a terminal jumper, see Figure 3-1 – JP1, JP2.

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Figure 3-1 Internal Features of the AMC-1225 Sensor Module

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4INSTALLATION
This section discusses topics relating to the proper installation of the AMC-1225 unit. The
proper location, sensor wiring selection and multi-unit interconnection are all discussed in detail
in the following section.
4.1 LOCATION AND MOUNTING
Mount the sensor unit on a solid non-vibrating surface or structure easily accessible for status
checking and calibration. The unit must be mounted in an area where the local concentration of
gas is unaffected by the presence of ventilation systems.
4.1.1 MOUNTING
1. Remove cover and mounting bracket with transmitter.
2. Mount housing using defined mounting holes.
3. Drill holes for conduit and then install conduit. See Warning below.
4. Reattach cover and bracket.
Warning:
Conduit should enter the housing from the bottom to ensure best protection against
ingress of condensation.
Conduit entry from the top from the top of the housing is Not Recommended.
However, if conduit entry through the top is the only available option, a Condensation
Drip Shield is provided to help protect the electronics from water ingress due to
condensation from the EMT conduit. If conduit entry is through the top of the housing,
a drain hole must be drilled into the bottom side of the housing to allow the
condensation to exit the housing. Any water damage related to conduit entry from the
top will not be covered under warranty.
NOTE:
Mounting arrangement of the housing depends on location and mounting surface.
Mounting hardware is NOT supplied.

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Figure 4-1 Standard Enclosure Mounting

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Figure 4-2 Pole Mounting
4.2 CABLE SELECTION AND WIRING
To gain access to the terminal blocks, remove the four (4) screws and front panel from the
housing. This will expose the field wiring terminals. The sensor / transmitter output (-,s,+)
terminal block connects to the input terminal block of the previous unit or to the sensor /
transmitter terminal block in the monitor as shown in Figure 4-3.

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NOTE:
Turn off the power supply before removing or replacing the sensor.
Connection 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 stranded wire is allowed between each unit
as well as between the monitor and first units. For other distances or cable sizes consult with
The Armstrong Monitoring Corporation.
4.2.1 MULTI-UNIT INTERCONNECTION
Each sensor is designed to interconnect to other units in series and/or parallel combinations.
Various typical configurations are shown in Figure 4-4, illustrating the versatility of this type of
system. Because each sensor is pre-calibrated, additional units can be added to a system
without altering the monitor settings. When multiple units are interconnected, either some or all
jumpers need to be removed. See Figure 4-3
4.2.2 TERMINATION
For any unused terminals a jumper has to be inserted. See Figure 4-3. Failure to do so may
cause the system to malfunction.

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Figure 4-3 Detail Wiring of Sensor Modules

AMC-1225 SENSOR MODULES
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Figure 4-4 Typical System Configuration Layouts
5OPERATION AND CALIBRATION
This section covers instructions for the proper operation and calibration of the AMC-1224, 1225
unit. The operation principles are described in further detail followed by different types of
periodic adjustments that might be required throughout the lifetime of the equipment.

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5.1 OPERATION
In general, after the stabilization period and in a clean air environment, the sensor module
should be displaying a GREEN Power ON LED. This green indicator, as well as the yellow and
red alarm indicators, are all visible through windows on the front panel.
5.1.1 ALARM CONDITIONS
If any gas exceeds the LOW alarm trip point setting, the yellow LED will turn ON and the unit will
transmit a signal and turn ON the yellow LED at the monitor. Likewise, if any gas exceeds the
HIGH alarm trip point setting, the red LED will turn ON.
5.1.2 FAULT SUPERVISION
The AMC-1225 is equipped with fault detection circuitry. This condition is indicated by turning
OFF the green LED viewed through the front panel. The condition will exist until the fault is
corrected.
5.2 CALIBRATION
The AMC-1225 sensor unit is factory calibrated at levels based on set standards. Calibration is
recommended two times per year.
Transmitters need to be returned to factory for calibration.
5.2.1 ADJUSTMENTS
All calibration adjustments are made using the three trimmers next to the single row of LEDs,
see Figure 3-1.
The LOW alarm adjustment is used to establish the low alarm trip point. This is done by
exposing the sensor to a low alarm gas concentration and adjusting the LOW trimmer
counterclockwise until the YELLOW LED just lights up.
The HIGH alarm adjustment is used to establish the high alarm trip point. This is done by
exposing the sensor to a high alarm gas concentration and adjusting the HIGH trimmer
counterclockwise until the RED LED just lights up.

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NOTE:
If the sensor has been replaced, adjust the SIGNAL first, then proceed with LOW alarm
and HIGH alarm adjustments. Signal calibration is performed using a digital multimeter
set to measure DC voltages to two (2) decimal places (e.g. 0.00 Volts).
The SIGNAL adjust is used to set the sensitivity of the sensor. This is done by exposing the
sensor to the LOW alarm concentration of gas. The voltage associated with signal can be
measured between the negative (-) power line on the output terminal block and the test point
next to the signal trimmer, see Figure 5-1Figure 5-1. The voltage measured at the signal test
point should be approximately 1.20 Volts.
When calibration is completed, remove the calibration chamber, replace the sensor element
while observing the correct polarity, and then reinstall the cover plate with the four screws.
CAUTION:
Only qualified personnel should perform the actual calibration. Users are advised to
consult The Armstrong Monitoring Corporation as to the recommended calibration gas
concentration for the application, and any other questions.

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Figure 5-1 Calibration/Verification set-up procedure

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6MAINTENANCE
This section covers topics related to the maintenance of the AMC-1225 unit. A general
description of maintenance to be carried out is followed by a verification of operation and then
details about the sensor replacement.
6.1 GENERAL
The sensor unit should be brushed or wiped clean once a year or more of any dust or dirt which
settles on it depending on the accumulation.
The unit should NOT be submerged or placed under conditions where water or other liquids
would be able to enter the transmitter.
6.2 VERIFICATION OF OPERATION
Verification of operation should be performed at least once every 6 months. For highly
demanding applications more frequent verification is recommended.
6.3 SENSOR REPLACEMENT
Sensor life is typically in excess of 10 years. The sensor should be replaced when the green
LED turns OFF while the unit is powered.
CAUTION:
Turn off the power supply before attempting the following.
When the sensor needs replacing, reorder the Part Number listed in Product Information (page
4). To replace the sensor element remove the four screws and cover plate from the housing.
Unplug the used sensor element from its socket and discard. Then plug in the replacement
sensor element, refer to Figure 3-1 for sensor polarity. Reinstall the cover plate and screws.
NOTE:
Allow 24 hours for the new sensor element to stabilize (burn-in) before recalibration, then
follow instructions in the Calibration section of this manual.