Armstrong Monitoring | Hazardous Gas Monitoring Specialists
Instruction Manual for Armstrong Monitoring models including: AMC-SIR Infrared Refrigerant Sensor Transmitter, AMC-SIR, Infrared Refrigerant Sensor Transmitter, Refrigerant Sensor Transmitter, Sensor Transmitter, Transmitter
AMC-SIR Infrared Refrigerant Sensor/Transmitter - Armstrong Monitoring
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DocumentDocumentAMC-SIR
Refrigerant Gas Sensor/Transmitter
INSTRUCTION MANUAL
IMPORTANT:
Please read these installation and operating instructions completely and carefully before starting.
Filename: 3575405B.doc
Revised February 2022 Copyright ©, February 2022, AMC
The Armstrong Monitoring Corporation 215 Colonnade Road South, Ottawa, Ontario, Canada K2E 7K3 Tel: (613) 225-9531 · Fax: (613) 225-6965 · Canada & U.S. Toll Free: 1-800-465-5777
E-mail: gas@armstrongmonitoring.com · Internet: www.armstrongmonitoring.com
AMC-SIR Refrigerant Gas Sensor/Transmitter
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AMC-SIR Refrigerant Gas Sensor/Transmitter
TABLE OF CONTENTS
Section Title
Page
1 WARRANTY............................................................................................................. 3 1.1 LIABILITY........................................................................................................... 3 1.2 PRODUCT RETURN ......................................................................................... 3 1.3 MODIFICATIONS AND SUBSTITUTIONS......................................................... 3
2 PRODUCT INFORMATION...................................................................................... 4 2.1 Manual Coverage............................................................................................... 4 2.2 SENSOR/TRANSMITTER MODULE ................................................................. 5 2.3 FACTORY CALIBRATION ................................................................................. 5
3 PRODUCT DESCRIPTION ...................................................................................... 6 4 INSTALLATION AND OPERATION ........................................................................ 8
4.1 LOCATION AND MOUNTING............................................................................ 8 4.1.1 MOUNTING .......................................................................................................... 8 4.1.2 WALL MOUNTING................................................................................................ 9 4.1.3 POLE MOUNTING...............................................................................................10
4.2 WIRING............................................................................................................ 11 4.2.1 MONITOR AND POWER SUPPLY WIRING ........................................................11 4.2.1.1 THE ANALOG INTERFACE..........................................................................11 4.2.1.2 TRANSMITTER TO MONITOR WIRING.......................................................12 4.2.1.3 TRANSMITTER CURRENT OUTPUT ..........................................................13 4.2.1.4 SENSOR/TRANSMITTER COMMUNICATION FAILURE .............................15 4.2.1.5 BOOT-UP PHASE AFTER TURN-ON ..........................................................15
4.3 CABLE SELECTION ........................................................................................ 16 5 CALIBRATION ....................................................................................................... 17
5.1 On Site Calibration equipment required ........................................................... 17 5.2 CALIBRATION PROCEDURE ......................................................................... 17
5.2.1 ZERO VERIFICATION.........................................................................................18 5.2.2 ZERO RECALIBRATION PROCEDURE..............................................................19 5.2.3 SPAN VERIFICATION .........................................................................................19 5.2.4 SPAN RECALIBRATION PROCEDURE..............................................................19
6 MAINTENANCE ..................................................................................................... 20 6.1 GENERAL ........................................................................................................ 20 6.2 VERIFICATION OF OPERATION .................................................................... 20 6.3 SENSOR/TRANSMITTER REPLACEMENT.................................................... 21
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AMC-SIR Refrigerant Gas Sensor/Transmitter
Figures and Tables Figure 2-2-1 AMC-SIR Refrigerant Gas sensor 2 vs sensor 1 .................................................... 4 Figure 3-1 AMC-SIR Refrigerant Gas sensor/transmitter Enclosure Overview ........................... 7 Figure 4-1 Standard Enclosure Mounting and Orientation .......................................................... 9 Figure 4-2 Pole Mounting ..........................................................................................................10 Figure 4-2 AMC-SIR Refrigerant Gas sensor/transmitter layout ................................................11 Figure 4-3 Jumper (JP3) installed .............................................................................................12 Figure 4-4 Transmitter to Monitor Wiring Diagram.....................................................................13 Figure 4-5 Transmitter to Non-AMC Monitor Wiring Diagram ....................................................14 Figure 4-6 Transmitter to Non-AMC Monitor with shunt resistor ................................................14 Figure 4-7 Wire Cable Selection Graph.....................................................................................16 Figure 5-1 Cal Meter Setup .......................................................................................................18 Table 1: Sensor and Display Outputs for AMC-SIR ...................................................................21
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AMC-SIR Refrigerant Gas Sensor/Transmitter
1 WARRANTY
The AMC-SIR Refrigerant Gas sensor/transmitter is warranted against defects in material and workmanship for a period of one year 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 sole 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. AMC is not liable for auxiliary interfaced equipment, nor for incidental 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 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 personnel should install and maintain the equipment.
AMC shall have no liability arising from auxiliary interfaced equipment, for incidental or 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.
WARNING
CHECK TO ASSURE THE WORKING AREA IS FREE FROM HAZARDS DURING INSTALLATION OR WHEN PERFORMING MAINTENANCE, AND USE PROPER PRECAUTIONS. FOLLOW PROPER INSTALLATION PRACTICES AS MAY BE REFERENCED/DICTATED IN OR BY LOCAL, PROVINCIAL, OR STATE BYLAWS AND/OR CODES.
1.2 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. All products returned to the client will be shipped by freight collect.
1.3 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.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
2 PRODUCT INFORMATION
2.1 Manual Coverage
This manual released in 2016 only covers the new Sensor 2 shown below. Sensor 1 is covered in earlier manuals that specify SIR_manual_rev_X as the filename on the front page. The filename specified for this manual on the front page is 3305405F.
TO TB1 TRANSMITTER
J1
LED1
POWER
Sensor 1
DIFFERENT CONNECTORS
TP1 V+
TP2 SIG
TB2
TO MONITOR CHG RSRS+ V+ SigV Ret
TO TB1 TRANSMITTER
S
GND TP3 GND
J1
LED1
POWER
1 1
Sensor 2
TP1
V+
TP2
SIG
TB2
TO MONITOR CHG RSRS+ V+ SigV Ret
GND
GND
TP3
S
Figure 2-2-1 AMC-SIR Refrigerant Gas sensor 2 vs sensor 1
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AMC-SIR Refrigerant Gas Sensor/Transmitter
2.2 SENSOR/TRANSMITTER MODULE
Sensor/transmitter unit order number. ............ Sensor/transmitter serial number................... Power Supply Requirement.......................... Current Requirement................................... Operating Temperature .............................. Relative Humidity ...................................... Signal Linearity..........................................
14 to 28VDC 70mA average, 140mA max
-20° to +40° C 0 to 95% RH, non-condensing Linear to the concentration of gas
2.3 FACTORY CALIBRATION
Gas Type.................................................. Zero Gas, at 4mA signal.............................. Gas Concentration at 20mA signal Calibration Adapter Part Number.................. Calibration Kit Part Number.........................
AMC-FL1 AMC-C1-FL1
Note:
All Armstrong Monitoring systems must be installed and maintained according to instructions to assure 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. For re-calibration extended warranty program information please call 1-800-465-5777.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
3 PRODUCT DESCRIPTION
The AMC-SIR Refrigerant Gas sensor/transmitter unit is designed to provide continuous, reliable surveillance of surrounding air for the target gas listed in the Factory Calibration (Section 2.3). Based on the physical measurement method of infrared absorption, it provides the best technique for reliable, precise measurements and selectivity.
The AMC-SIR Refrigerant Gas sensor/transmitter provides a 4-20mA current output proportional to the Gas Concentration.
Two versions of the AMC-SIR, the AMC-SIR and the AMC-SIR-ERS, are available with broadband sensors. These products are calibrated with the refrigerant gas R134a, and can be used to detect a range of different target refrigerant gases using a known scaling factor. If the SIR is installed with the AMC-1AREF Monitor then the alarm level and display settings are adjusted in the factory based on the target gas scaling factor. Refer to the Monitor User Manual for details.
The AMC-SIR can be used to detect the following gases R134a R123 R22 R23 R32 R407c R407f R410a R455a R507a
The AMC-SIR-ERS can be used to detect the following gases R1233zd R1234yf R1234ze R125 R404a R407a R438a R448a R449a R452a R513a R514a
Each sensor/transmitter unit is factory calibrated and is ready for field installation and operation.
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AMC-SIR Refrigerant Gas Sensor/Transmitter OVERVIEW:
Figure 3-1 AMC-SIR Refrigerant Gas sensor/transmitter Enclosure Overview
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AMC-SIR Refrigerant Gas Sensor/Transmitter
4 INSTALLATION AND OPERATION
The following sections provide guidelines for installation; location and mounting, wiring, and cable selection.
4.1 LOCATION AND MOUNTING
Mount the AMC-SIR Refrigerant Gas sensor/transmitter on a solid, non-vibrating surface or structure in an area where the ambient concentration of gas is not directly affected by the presence of clean air supply, ventilation systems, or blockage by surrounding articles and sources of interference gas or contaminants. The AMC-SIR Refrigerant Gas sensor/transmitter shall be installed in an area where refrigerant from a leak is most likely to concentrate. The installer is required to provide the necessary mounting hardware for the unit. There is a 7/8" conduit hole for the installation wiring located on the bottom of the enclosure, refer to Fig. 4-1.
4.1.1 MOUNTING 1. Remove cover and mounting bracket with transmitter. 2. Mount housing using defined mounting holes. See Figure 4-1or Figure 4-2. 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. Mount enclosure with the sensor located as shown in Error! Reference source not found.(upright). This will ensure correct orientation. DO NOT mount sensor on its back (facing up) with power as this can affect precision of the sensor.
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AMC-SIR Refrigerant Gas Sensor/Transmitter 4.1.2 WALL MOUNTING
Figure 4-1 Standard Enclosure Mounting and Orientation
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AMC-SIR Refrigerant Gas Sensor/Transmitter 4.1.3 POLE MOUNTING
Figure 4-2 Pole Mounting
Warning:
Choose appropriate conduit hardware as to not interfere with internal components.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
4.2 WIRING
The AMC-SIR Refrigerant Gas sensor/transmitter was designed to operate with a power supply voltage range of 14V to 28VDC. It can be interconnected to a suitable Armstrong monitor panel or be powered from a stable 14-28VDC power source, with its 4-20mA signal interconnected to a suitable measuring device.
For best signal transmission and maximum noise rejection, it is recommended to run the three conductor shielded installation cable through steel conduit (the cable shield must be chassis grounded at the monitor or power supply).
4.2.1 MONITOR AND POWER SUPPLY WIRING
All field wiring connections for the AMC-SIR Refrigerant Gas sensor/transmitter are made via TB2. Figure 4-2 shows the wiring layout of the AMC-SIR Refrigerant Gas sensor/transmitter.
TO TB1 TRANSMITTER
J1
LED1
POWER
TP1
V+
TP2
SIG
TB2
TO MONITOR CHG
RS-
RS+
V+ SigV Ret
CHG RSRS+ V+ SigV Ret
S
S
1
GND
GND
TP3
GND
LANDING POINT FOR CABLE SHIELD INVERTED SIGNAL LINE FOR THE INTEGRATED RS485 INTERFACE NON - INVERTED SIGNAL LINE FOR THE INTEGRATED RS485 INTERFACE POWER SUPPLY CONNECTION 14 - 28VDC
SIGNAL OUTPUT CONFIGURED FOR 4-20mA COMMON GROUND
Figure 4-2 AMC-SIR Refrigerant Gas sensor/transmitter layout
4.2.1.1 THE ANALOG INTERFACE
The analog interface of the AMC-SIR Refrigerant Gas sensor/transmitter offers a linearized 420mA analog current signal; proportional to the concentration of gas measured. This signal is interpreted by the interconnected monitor.
Alternatively, the AMC-SIR Refrigerant Gas sensor/transmitter can also be used independently, with its 4-20mA output connected to a suitable measuring device.
The standard configuration for output current is 4-20mA with the JP3 jumper installed. (Condition as delivered) See Fig 4-3.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
JP2 JP3
Figure 4-3 Jumper (JP3) installed
4.2.1.2 TRANSMITTER TO MONITOR WIRING When connecting to an AMC Monitor, the AMC-SIR Refrigerant Gas sensor/transmitter is wired with a 3-conductor shielded cable. Fig. 4-4 shows the connection between the AMC-SIR Refrigerant Gas sensor/transmitter and an AMC Monitor. In this configuration, power is provided via the Monitor. When the power supply is turned on, the green (power) LED will be illuminated and the AMC-SIR Refrigerant Gas sensor/transmitter will become active. See section 4.2.1.5 for Boot-up phase after turn-on.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
TO TB1 TRANSMITTER
J1
LED1
POWER
TRANSMITTER HOUSING REMOVED FOR CLARITY
TP1V+
TP2
SIG
TB2
TO MONITOR CHG RSRS+ V+ SRigeVt
SHIELD
S
1
GND TP3 GND
+ AMC S MONITOR
CHASSIS GND
NOTE:
ALL WIRING MUST PASS THROUGH CONDUIT OPENING LOCATED AT THE BOTTOM OF ENCLOSURE. REFER TO FIGURE 4-1
Figure 4-4 Transmitter to Monitor Wiring Diagram
4.2.1.3 TRANSMITTER CURRENT OUTPUT
When using a non AMC monitor, AMC-SIR Refrigerant Gas sensor/transmitter is connected as shown in Fig. 4-5. If necessary, the output current may be converted to a linear voltage signal in order to measure the signal. To accomplish this, a high-precision resistor must be connected to the current input of the non AMC monitor as a shunt. See Fig. 4-6.
The resultant voltage drop across the resistor then linearly reflects the concentration value of
the measured gas. Depending on the operating current setting, the following values for the
output voltage can be established:
4-20mA
0.4V 2.0V with a 100 load resistor
4-20mA
1.0V 5.0V with a 250 load resistor
4-20mA
2.0V 10.0V with a 500 load resistor
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AMC-SIR Refrigerant Gas Sensor/Transmitter
1 1
S S
TRANSMITTER HOUSING REMOVED FOR CLARITY
TP1
V+
TO TB1 TRANSMITTER
TP2
SIGTB2
TO MONITOR
CHG
RS-
RS+ V+
SHIELD
+ FILTERED
SigV Ret
{ POWER 14 - 28 VDC
J1
GND
- SUPPLY
LED1
POWER
TP3 GND
4-20mA SIGNAL
NOTE:
ALL WIRING MUST PASS THROUGH CONDUIT OPENING LOCATED AT THE BOTTOM OF ENCLOSURE. REFER TO FIGURE 4-1
- COMPUTER
{
DATALOGGER OR NON-AMC
+ MONITOR
CHASSIS GND
Figure 4-5 Transmitter to Non-AMC Monitor Wiring Diagram
TO TB1 TRANSMITTER
J1
LED1
POWER
TRANSMITTER HOUSING REMOVED FOR CLARITY
TP1
V+
TP2
SIG
TB2
TO MONITOR CHG RSRS+ V+ SigV Ret
GND
TP3 GND
SHIELD
+
S
NON-AMC MONITOR
L
O
- A
D
CHASSIS GND
NOTE: ALL WIRING MUST PASS THROUGH CONDUIT OPENING LOCATED AT THE BOTTOM OF ENCLOSURE. REFER TO FIGURE 4-1
Figure 4-6 Transmitter to Non-AMC Monitor with shunt resistor
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AMC-SIR Refrigerant Gas Sensor/Transmitter
Caution:
Maximum load resistance is 500 ohms @ 24VDC, 300 ohms @ 14VDC. Special consideration is required to provide the transmitter with enough supply voltage as lowering the supply voltage reduces the maximum load allowable. See section 4.3 for appropriate cable lengths to accommodate required supply voltages.
4.2.1.4 SENSOR/TRANSMITTER COMMUNICATION FAILURE If the sensor malfunctions, this state is indicated as follows at the current output:
4-20mA operation output current is frozen at 3.5mA. Depending on the operating mode and the downstream evaluation, such a state can then be used for fault detection purposes. When the defect is fixed, the AMC-SIR Refrigerant Gas sensor/transmitter automatically begins its normal boot-up phase and then switches back to normal mode, as described in section 4.2.1.5.
4.2.1.5 BOOT-UP PHASE AFTER TURN-ON
After the power supply and the desired interface have been connected to the AMC-SIR Refrigerant Gas sensor/transmitter, the sensor starts with a boot phase. This lasts less than 2 minutes and serves to check all internal components and routines. During the boot phase, the following states can occur depending on the selected operating mode:
4-20mA output:
Initial output current is approx. 3.2mA, increasing to 4mA after about 2 minutes, in a gas-free environment. The sensor signal can fluctuate during the warm-up period.
When the boot phase is finished, and when all test routines have properly finished, the AMCSIR Refrigerant Gas sensor/transmitter automatically switches to normal operating mode and provides a signal output proportional to the gas concentration.
Caution:
The AMC-SIR Refrigerant Gas sensor/transmitter must be in operation for 60 minutes to achieve full stabilization.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
4.3 CABLE SELECTION
The following section details the cable selection needed to ensure proper operation of the AMCSIR Refrigerant Gas sensor/transmitter. The figure below is an aid for cable selection. A 3-conductor shielded cable is employed for interconnection. All AMC Monitors typically output 24VDC with the exception of the 1A Monitor which will vary from 19-24VDC depending on the load, so choose cable accordingly. When using just AMC-SIR transmitters with a 1A Monitor the voltage will be over 20VDC. There are three variables that determine the maximum cable length; wire gauge, power supply voltage, and load resistance. A minimum operating voltage of 14VDC is required at the sensor/transmitter. Wire gauge can range from 20 to 16 AWG.
Figure 4-7 Wire Cable Selection Graph
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AMC-SIR Refrigerant Gas Sensor/Transmitter
5 CALIBRATION
This section describes the calibration procedure for the AMC-SIR Refrigerant Gas sensor/transmitter.
Each AMC-SIR Refrigerant Gas sensor/transmitter is factory calibrated and should be ready for operation after installation and a 60 minute stabilization time.
Verification of calibration is recommended two times per year. For highly demanding applications, more frequent checks are recommended.
Caution:
- Only qualified personnel should perform the actual calibration. - Users new to gas calibration are advised to consult with Armstrong Monitoring - For the AMC-SIR calibrate with 1000ppm R134a only. - For the AMC-SIR-ERS calibrate with 2000ppm R134a only.
The Armstrong Monitoring Corporation offers the following calibration plans: 1. Factory pre-calibrated replacement sensor/transmitter units 2. On site installation and calibration by Armstrong Monitoring 3. On site calibration by Armstrong Monitoring 4. Training by Armstrong Monitoring
5.1 On Site Calibration equipment required
For qualified personnel, the following is a recommended list of calibration equipment required.
A digital multi-meter with ranges of 20.0mA or greater. A calibration jack plug type test lead for the above meter (provided by AMC) Zero & Span gases for use with a 0.5lpm flow regulator (contact AMC for information) Cal Adapter, P/N: AMC-FL1 or AMC-C1-FL1 for calibration kit
5.2 CALIBRATION PROCEDURE
The transmitter is equipped with a remote calibration feature allowing for one-man calibration at the transmitter location. The transmitter output is measured using a digital multimeter set to mA scale, with a cal jack plug connected to the cal jack (J1), see Fig 5-1. When using the cal jack, signal to the monitor is interrupted and will instead be shown in mA on the multimeter connected to the cal jack (J1). The analog output range corresponding to the Factory Calibration (Section 2.3) is 4-20mA.
Warning:
The calibration procedure will cause signal loss to the monitor. Appropriate precautions may be required.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
DIGITAL MULTIMETER
(DC CURRENT MODE)
mA DC
TRANSMITTER HOUSING REMOVED FOR CLARITY
mA Com
REMOTE CALIBRATION LEAD
TO TB1 TRANSMITTER
J1
LED1
POW ER
JP2 JP3 STATUS LEDs 1-3
TP1 V+
TP2 SIG
TB2
TO MONITOR CHG RSRS+ V+ SigV Ret
GND
TP3 GND
1
S
INSERT PLUG INTO CAL JACK
CALIBRATION ADAPTER
REGULATOR
CALIBRATION GAS
CYLINDER
Figure 5-1 Cal Meter Setup
Caution:
The AMC-SIR Refrigerant Gas sensor/transmitter must be in operation for 60 minutes before calibration can be performed! Unless otherwise specified for the application, it is recommended that the sensors be tested a minimum of twice a year and calibrated when necessary.
5.2.1 ZERO VERIFICATION
The zero point should be checked with zero gas. Gas should be applied at 0.5lpm using the AMC-FL1 calibration adapter, as shown in Figure 5-1.Once the sensor has been completely purged, the output measured at the cal jack should be between 3.9 - 4.1mA. If the measured value is:
Within this expected range proceed to Span Verification. Greater than 4.8mA or less than 3.2mA, then an on site calibration will be required with
Armstrong Monitoring to recalibrate the sensor. Slight zero deviations on the other hand can be re-adjusted using the Zero Recalibration
Procedure below.
Caution:
Only use pure zero gas consisting of nitrogen or air.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
5.2.2 ZERO RECALIBRATION PROCEDURE
1. Apply zero gas until sensor has been completely purged.
2. While the zero gas is still being applied, locate JP2 jumper and connect to JP2 position. Yellow Status LED flashes on then should become steady. If this Yellow LED continues to flash, contact Armstrong Monitoring for service.
3. Removing the JP2 jumper will incorporate the setting into the module. The Green Status LED's flashes 3 seconds to confirm. If a Red Status LED flashes an error has occurred and process must be repeated. The output current on the meter should now read 4mA. If 0mA current can not be achieved or the LEDs do not operate properly contact Armstrong Monitoring for service.
4. Proceed to span recalibration after successful zero calibration.
5.2.3 SPAN VERIFICATION The span should be checked with a precision sample of gas, equivalent to the concentration shown in Factory Calibration (Section 2.3.) Gas should be applied at 0.5lpm using the AMC-FL1 calibration adapter, as shown in Figure 5-1.
1. Apply span gas (100% full scale) to the sensor until it is purged. The output measured at the cal jack should be 20mA. If the current measured is off by more than +/-5% then proceed to the Span Recalibration Procedure below.
5.2.4 SPAN RECALIBRATION PROCEDURE 1. Apply span gas until sensor purged with span gas.
2. While the span gas is still being applied, locate JP2 jumper and connect to JP2 position. Yellow Status LED flashes on then should become steady. If this Yellow LED continues to flash the calibration gas could be deficient, if not contact Armstrong Monitoring for service.
3. Removing the JP2 jumper will incorporate the setting into the module. The Green Status LED's flashes 3 seconds to confirm. If a Red Status LED flashes an error has occurred and process must be repeated. The output current on the meter should now read 20mA . +/-5%. If 20mA current can not be achieved or the LEDs do not operate properly contact Armstrong Monitoring for service.
Caution:
Only use the Full Range (20mA) gas concentration as defined in Factory Calibration (Section 2.3)
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AMC-SIR Refrigerant Gas Sensor/Transmitter
6 MAINTENANCE
6.1 GENERAL
The AMC-SIR Refrigerant Gas sensor/transmitter unit 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.
6.2 VERIFICATION OF OPERATION
Scheduled calibration is critical in maintaining proper function of gas sensor/transmitters. Verification of operation should be performed at least once every 6 months. For highly demanding applications, more frequent verification is recommended. As mentioned, Armstrong Monitoring offers a number of different maintenance plans to suit your requirements see Section 5. Note for AMC-SIR or AMC-SIR-ERS transmitters verification can be performed using the calibration gas (R134a) or using the target gas. If R134a gas is used then the current output from the sensors will be as expected but any displays on the 1AREF Monitor will show incorrect readings as they have been factory adjusted to the target gas scaling factor. If the target gas is used the correct reading for the specific gas concentration will be shown on the 1AREF Monitor displays but the current output from the sensor will depend upon the sensor scaling factor per the table below.
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AMC-SIR Refrigerant Gas Sensor/Transmitter
Gas
R134a R123 R22 R23 R32 R407c R407f R410a R455a R507a Gas
R1233zd R1234yf R1234ze R125 R404a R407a R438a R448a R449a R452a R513a R514a
Table 1: Sensor and Display Outputs for AMC-SIR
SIR Version
Target Gas
Scaling Factor
AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR AMC-SIR SIR Version
AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS AMC-SIR-ERS
R134a R123 R22 R23 R32 R407c R407f R410a R455a R507a Target Gas R1233zd R1234yf R1234ze R125 R404a R407a R438a R448a R449a R452a R513a R514a
1 1.077 1.432 1.042 1.641 1.009 0.992 1.082 2.676 1 Scaling Factor 0.909 0.682 0.632 0.675 0.773 0.852 0.843 0.86 0.851 0.614 0.735 0.684
Sensor Current Output
(mA)
1000ppm 1000ppm
R134a
Target Gas
20
20
20
18.9
20
15.2
20
19.4
20
13.8
20
20
20
20
20
18.8
20
10
20
20
2000ppm 1000ppm
R134a
Target Gas
20
12.8
20
15.7
20
16.7
20
15.9
20
14.7
20
12.8
20
13.5
20
13.3
20
13.4
20
17
20
14.9
20
15.7
1AREF Display Output
1000ppm R134a 1000 1074 1429 1039 1633 1000 1000 1081 2667 1000 2000ppm R134a 1818 1368 1260 1345 1495 1818 1684 1720 1702 1231 1468 1368
1000ppm Target Gas 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000ppm Target Gas 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000
6.3 SENSOR/TRANSMITTER REPLACEMENT
When its signal is greatly reduced or unstable, a sensor/transmitter replacement is required; see section 2.2 for replacement sensor/transmitter P/N. Contact AMC immediately.
Warning:
DO NOT replace the sensor/transmitter board while the system is still powered up.
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