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AMC 2751 Instruction Manual

Transmitter with electrochemical sensor
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INSTRUCTION MANUAL
IMPORTANT:
Please read these installations and operating instructions completely
and carefully before starting.
Filename: 3067405B.doc
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
2751
Transmitter with
Electrochemical Sensor
The Armstrong Monitoring Corporation
Revised: Apr 23, 2007
Copyright ©, April 2004, AMC

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  • Page 1 Revised: Apr 23, 2007 Filename: 3067405B.doc Copyright ©, April 2004, 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...

  • Page 3: Table Of Contents

    AMC-2751 Transmitter & Sensor TABLE OF CONTENTS Section Title Page WARRANTY......................3 LIABILITY......................3 PRODUCT RETURN ..................3 MODIFICATIONS AND SUBSTITUTIONS............3 PRODUCT INFORMATION..................4 SENSOR/TRANSMITTER MODULE ..............4 FACTORY CALIBRATION ................. 4 PRODUCT DESCRIPTION ..................5 GENERAL DESCRIPTION................. 5 3.1.1...
  • Page 4 AMC-2751 Transmitter & Sensor...

  • Page 5: Warranty

    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).

  • Page 6: Product Information

    AMC-2751 Transmitter & Sensor 2 PRODUCT INFORMATION 2.1 SENSOR/TRANSMITTER MODULE Sensor/transmitter unit order number. …………………… AMC-2751 Sensor/transmitter serial number..……………………….. Transmitter board with display order number ……….….. Sensor order number..…………………….……..……… … AMC 91AG Sensor Date Code………………………………….……….. Power Supply Requirement…………………………………. 12 to 24 VDC @ 20 mA Sensor Warranty……………………………………………..

  • Page 7: Product Description

    3 PRODUCT DESCRIPTION 3.1 GENERAL DESCRIPTION The AMC-2751 sensor/transmitter unit is designed to provide continuous, reliable surveillance of surrounding air for the target gas listed in the Factory Settings (Section 2.2). This unit provides a 4 to 20 mA, variable current signal, which is proportional to the gas concentration detected.

  • Page 8: Amc-2751 Housing

    AMC-2751 Transmitter & Sensor 3.2 AMC-2751 HOUSING The AMC-2751 sensor/transmitter unit is enclosed in an ABS housing as shown in Figure 1. This housing is suitable for use in parking and service garages where the unit is not exposed to rain or direct sunlight.

  • Page 9: Installation

    4 INSTALLATION 4.1 LOCATION AND MOUNTING Mount the AMC-2751 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, blockage by surrounding articles and sources of interference gases.

  • Page 10: Cable Selection And Wiring

    The AMC-2751 minimum stated voltage requirement of 12 VDC is based on the use of a 250 ohm load resistor to covert the current signal into a voltage signal. The maximum Cable Distance Chart (Figure 3) assumes the use of a 250 ohm load resistor, and a safety margin of .5 VDC.
  • Page 11 AMC-2751 Transmitter & Sensor TRANSMITTER CIRCUIT WHITE BLACK TRANSMITTER TERMINAL BLOCK WARNING 1 TRANSMITTER ( - ) TERMINAL CONNECTS TO MONITOR SIG (SIG) TERMINAL. 12 TO 27 VDC CONDUIT SHIELD WHITE BLACK WARNING 2 CABLE SHIELD MUST MONITOR NOT BE USED AS A CONDUCTOR.

  • Page 12: Interfacing To Computer Or Datalogger

    AMC-2751 Transmitter & Sensor 4.2.2 INTERFACING TO COMPUTER OR DATALOGGER The signal output of the AMC-2751 sensor/transmitter is a 4 to 20 mA DC current, therefore it can be connected to computers or data-loggers equipped with an analog-to-digital converter. In many cases a load resistor is required to convert the 4 to 20 ma current signal to a voltage signal, as shown in Figure 5.

  • Page 13: Operation And Calibration

    5 OPERATION AND CALIBRATION 5.1 OPERATION The AMC-2751 sensor/transmitter is factory calibrated for the gas listed in the Product Information (Section 2) at the beginning of this manual. The sensor/transmitter should not require re-calibration when first installed and powered up, but a test for correct operation is recommended after a stabilization period of 30 minutes.

  • Page 14: On Site Calibration Equipment Required

    4) Apply a Zero gas sample, with a calibration adapter cup firmly and completely over the sensor opening on side of AMC-2751 for 2 minutes with a flow rate of .5 liters per minute. 5) At 2 minutes adjust the Zero trimmer for a zero current of 4.00 mA +/- .1ma. Note that the zero current may give a signal representing a gas concentration as high as 2ppm depending on the zero gas used.
  • Page 15 AMC-2751 Transmitter & Sensor DIGITAL MULTIMETER Set scale for 200 mV or more. Set scale for 20 mA or more. 12.000 +050.0 INSERT REMOTE CAL LEAD INTO CAL JACK Use "Clip On" type lead to take voltage measurements. CAL JACK...

  • Page 16: Maintenance

    6.3 SENSOR/TRANSMITTER REPLACEMENT The sensor life of the AMC-2751 is typically over 4 years. When its signal is greatly reduced or unstable, the sensor replacement is required. Please note that the sensor itself is not replaceable. To replace the circuit card with the sensor, please contact the factory.

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