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AMC 350 Instructions Manual

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Installation, Calibration & Maintenance
of the AMC-350 Sensor/Transmitter
IMPORTANT:
Please read these installations and operating instructions completely
and carefully before starting.
Filename; Manual_amc-350_transmitter.doc
215 Colonnade Road South, Nepean, 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/gas/
350
Sensor/Transmitter
INSTRUCTIONS
The Armstrong Monitoring Corporation
Revised, 7/21/2004
Copyright ©, April 1989, AMC

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  • Page 1 Sensor/Transmitter INSTRUCTIONS Installation, Calibration & Maintenance of the AMC-350 Sensor/Transmitter IMPORTANT: Please read these installations and operating instructions completely and carefully before starting. Revised, 7/21/2004 Filename; Manual_amc-350_transmitter.doc Copyright ©, April 1989, AMC The Armstrong Monitoring Corporation 215 Colonnade Road South, Nepean, Ontario, Canada K2E 7K3 Tel: (613) 225-9531 •...

  • Page 3: Table Of Contents

    SENSOR / TRANSMITTER SPECIFICATIONS............5 HOUSING OPTIONS ..................6 INSTALLATION ....................... 7 LOCATION AND MOUNTING................7 CABLE SELECTION AND WIRING ..............8 COMPUTER, DATALOGGER OR NON-AMC INTERFACE ......9 OPERATION AND CALIBRATION ................ 11 OPERATION ....................11 CALIBRATION ....................11 5.2.1 EQUIPMENT REQUIRED ..................11...
  • Page 4 AMC-350 Sensor/Transmitter NOTE This page intentionally left blank.

  • Page 5: Warranty

    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.

  • Page 6: Product Information

    AMC-350 Sensor/Transmitter 2 PRODUCT INFORMATION 2.1 SENSOR/TRANSMITTER Sensor/Transmitter Unit Order Number..……………………….. Transmitter Part Number…………..……………..………………. Transmitter Serial Number………...………………………….…… Sensor Part Number…………………………………………….….. Sensor Serial Number ………….………………………………….. Power Supply Requirement ………………………………………. 12 to 26 VDC @ 250 mA Signal Output Load ……………………………………………….. maximum 250 ohms Sensor Warranty ………………………………………………..

  • Page 7: Product Description

    3 PRODUCT DESCRIPTION 3.1 GENERAL DESCRIPTION The AMC-350 series sensor/transmitter unit is designed to provide continuous, reliable surveillance of surrounding air for traces of hazardous gases (listed in Factory Calibration, section 2.2). It provides a 4 to 20 mA, variable current signal, which is proportional to the gas concentration detected.

  • Page 8: Housing Options

    AMC-350 Sensor/Transmitter 3.2 HOUSING OPTIONS The AMC-350 series sensor/transmitter units are available in the following housings (see FIGURE 1). The explosion-proof housings are also available with a corrosion resistant finish. • Explosion-Proof (rated for Class I, Groups B, C, D) •...

  • Page 9: Installation

    AMC-350 Sensor/Transmitter 4 INSTALLATION 4.1 LOCATION AND MOUNTING Mount the sensor/transmitter unit on a solid, non-vibrating surface or structure in an area where the local concentration of gas is unaffected by the presence of ventilation systems. sensor/transmitter housing SHOULD NOT touch the mounting surface. In some cases this may require the use of a spacer between the mounting surface and the sensor/transmitter housing.

  • Page 10: Cable Selection And Wiring

    AMC-350 Sensor/Transmitter 4.2 CABLE SELECTION AND WIRING The transmitter output (–, S, +) terminal block connects to the (–, S, +) connections on a channel terminal block of the monitor (one transmitter per channel), as shown in FIGURE 4. Connection should be made using 3-conductor, shielded cable (shield must be grounded at the monitor).

  • Page 11: Computer, Datalogger Or Non-Amc Interface

    AMC-350 Sensor/Transmitter FIGURE 4: Transmitter wiring layout. 4.3 COMPUTER, DATALOGGER OR NON-AMC INTERFACE Refer to FIGURE 5 for the following. All Armstrong sensor/transmitter units can be interfaced with computers or dataloggers through analog-to-digital converters. The signal output from the transmitter is a 4 to 20 mA DC current. This can be measured from the signal wire, or if a voltage measurement is needed, connect a load resistor (250 ohms max) between the transmitter signal output (S) and power supply ground (–).
  • Page 12 AMC-350 Sensor/Transmitter FIGURE 5: Interface to computer, datalogger or non-AMC monitor.

  • Page 13: Operation And Calibration

    5 OPERATION AND CALIBRATION 5.1 OPERATION The AMC-350 series sensor/transmitter unit is factory calibrated for the gas listed in Product Information (section 2). The unit should not need recalibration when first installed and powered up, but a test for correct operation is recommended.

  • Page 14: Transmitter Calibration/Verification Procedure

    AMC-350 Sensor/Transmitter 5.2.2 TRANSMITTER CALIBRATION/VERIFICATION PROCEDURE The calibration procedure may cause the monitoring equipment to give a false alarm; therefore appropriate precautions should be taken. Instructions for introducing the gas sample are included with every Calibration Kit or available separately on request (depending on type of gas or application).
  • Page 15 AMC-350 Sensor/Transmitter FIGURE 6: Calibration/Verification Set-up.

  • Page 16: Preventive Maintenance

    AMC-350 Sensor/Transmitter 6 PREVENTIVE MAINTENANCE 6.1 GENERAL The sensor/transmitter 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 in water or other liquids.
  • Page 17 AMC-350 Sensor/Transmitter FIGURE 7: Sensor replacement procedure.

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