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ACM DTM Series Installation And Operating Instructions Manual

Digital transmitter module
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DTM Series
Digital Transmitter Module
Installation and Operating Instructions for the
AMC DTM Sensor Transmitter
IMPORTANT:
Please read these instructions completely and carefully
before installing and operating of this equipment.
Original, 09 June 2004
filename: Manual_DTM_Transmitter.doc
Copyright ©, June 2004
The Armstrong Monitoring Corporation
215 Colonnade Road South, Nepean, Ontario, Canada K2E 7K3
Tel: (613) 225-9531 • Fax: (613) 225-6965 • U.S. Toll Free: (800) 465-5777
E-mail: gas@armstrongmonitoring.com • Internet: www.armstrongmonitoring.com

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  • Page 1 DTM Series Digital Transmitter Module Installation and Operating Instructions for the AMC DTM Sensor Transmitter IMPORTANT: Please read these instructions completely and carefully before installing and operating of this equipment. Original, 09 June 2004 filename: Manual_DTM_Transmitter.doc Copyright ©, June 2004...

  • Page 3: Table Of Contents

    AMC-DTM-Sensor Transmitter TABLE OF CONTENTS SECTION TITLE PAGE Warranty........................iii Liability ........................... iii Modifications and Substitutions ..................iii Product Return ....................... iii Product Information .....................iv Transmitter ........................iv Factory Settings ......................iv Production Description....................1 General Description......................1 Installation ........................2 Location and Mounting ....................2 Cable Selection .......................3 Electrical Interfaces ......................5 4.3.1 Input Power Supply ......................5...
  • Page 4 AMC-DTM-Sensor Transmitter 5.5.5 Engineering Units ......................20 5.5.6 Pre-config (Predefined Configuration) ................21 5.5.7 Sensor Configuration.....................21 5.5.8 Password ........................21 5.5.9 Relays Option........................22 Calibration Procedure ....................23 General .........................23 Calibration Procedure....................24 6.2.1 Using Gas Depletion As A Measure Of Another Gas’s Concentration ......25 Preventive Maintenance....................26 Maintenance........................26 Sensor Replacement and Wiring ...................26 7.2.1 Sensor Interface ......................27...

  • Page 5: Warranty

    AMC-DTM-Sensor Transmitter 1 Warranty AMC products are warranted against defects in material and workmanship for a period of two (2) years from date of delivery. During the warranty period, we will repair or replace components that prove to be defective in the opinion of The Armstrong Monitoring Corporation. We are not liable for auxiliary interfaced equipment, nor consequential damage.

  • Page 6: Product Information

    AMC-DTM-Sensor Transmitter 2 Product Information 2.1 Transmitter Sensor/ Transmitter Unit Order Number Transmitter Part Number Transmitter Serial Number Sensor Part Number Sensor Serial Number Power Supply Requirements 12 to 24 Vdc @ 70 mA 2.2 Factory Settings Gas Type Range Zero Gas, at 4 mA signal Gas Concentration at 20 mA signal - iv -...

  • Page 7: Production Description

    3 Production Description 3.1 General Description The AMC-DTM series sensor/transmitter micro-controller based unit is designed to provide continuous, reliable surveillance of surrounding air for traces of a specific hazardous gas. There is a broad range of electrochemical gas sensors available for use with the DTM Transmitter.

  • Page 8: Installation

    AMC-DTM-Sensor Transmitter 4 Installation 4.1 Location and Mounting The sensor/transmitter should be mounted in a location sufficient enough for the sensor to receive its environment, and secure from potential mechanical damage. It should remain clean and free from debris. The internal area of the transmitter enclosure must be kept clean and dry. Mount the sensor/transmitter in a location such that it will not experience submersion in liquids, exposure to extreme temperatures, and electrical noise signals.

  • Page 9: Cable Selection

    AMC-DTM-Sensor Transmitter 4.2 Cable Selection Connection should be made using 3-conductor shielded cable. For best signal transmission and maximum noise rejection, run cable through steel conduit (cable shield must be grounded at the monitor or power supply). For basic cable selection (between monitor and transmitter) when using a 250 ohm load resistance, use the following chart: Cable Selection Chart Wire Gauge...
  • Page 10 AMC-DTM-Sensor Transmitter Figure 4-2: Cable Selection Graph - 4 -...

  • Page 11: Electrical Interfaces

    Table 4-1: Input Power Supply 4.3.2 Analogue Output (4-20 mA) For installation to a DC Power Supply only, the AMC-DTM series sensor/transmitter is field wired as illustrated in Figure 4-3. The terminal block pinout for TB-3 is given in Table 4-2 and output specifications are provided in Table 4-3.
  • Page 12 AMC-DTM-Sensor Transmitter For installation to an AMC Monitor, the AMC-DTM series sensor/transmitter is field wired as illustrated in Figure 4-4. The terminal block pinout for TB-3 is given in Table 4-2 and output specifications are provided in Table 4-3. Figure 4-4: Typical Field Wiring of AMC-DTM to AMC Monitor...

  • Page 13: Modbus Rs485 Interface

    AMC-DTM-Sensor Transmitter 4.3.3 MODBUS RS485 Interface For installation in a MODBUS configuration, the AMC-DTM series sensor/transmitters are field wired as illustrated in Figure 4-5. The terminal block pinout for TB-2 is given in Table 4-4 and RS485 specifications are provided in Table 4-5 and Table 4-6.
  • Page 14 AMC-DTM-Sensor Transmitter Value Parameter Units data rate 1200 19200 57600 Parity NONE/EVEN/ODD Data Bits (LSB sent first) Bits Stop Bits Bits Start Bits Bits Voltage Conductor Size Table 4-6: RS485 Interface Specification (ASCII Modbus Mode) - 8 -...

  • Page 15: Operation

    AMC-DTM-Sensor Transmitter 5 Operation The transmitter has a non-intrusive operation interface. The front face contains a capacitive contact that operates like normal push buttons. To operate a push button, simply place your index finger on the glass over the desired arrow. 5.1 Operator Interface Operator Interface, illustrated in Figure 5-1, consists of a four-button keypad, four LEDs and a LCD.

  • Page 16: Liquid Crystal Display

    AMC-DTM-Sensor Transmitter • Button “Forward” enters currently scrolled submenu. It also serves as “yes” choice, when offered. When entering text or numbers, it moves entry point forward one character. Figure 5-2: Keypad part of the Operator Interface 5.1.2 Liquid Crystal Display Liquid Crystal Display (LCD) displays 12 characters in each of the two lines (2x12).
  • Page 17 AMC-DTM-Sensor Transmitter When an Alarm is declared, LCD displays Concentration Display and Alarm Display in 2 two- second flash periods. See Figure 5-3 and Figure 5-4. F A1 A2 A3 ALARM 1 > 50.0%LEL Figure 5-4: Alarm Display The first line shows the name of the active alarm. The second line shows the condition triggering the alarm.

  • Page 18: Device Programming Menu

    AMC-DTM-Sensor Transmitter F A1 A2 A3 ALARM 2 > 80.0%LEL s Figure 5-7: LCD - Alarm display during Silence period When the transmitter detects a failure, Fail Alarm condition is displayed. See Figure 5-8. F A1 A2 A3 FAIL LCD err 140:l Figure 5-8: FAIL Alarm display 5.2 Device Programming Menu The following is a graphical representation of the programming menu of the transmitter...
  • Page 19 AMC-DTM-Sensor Transmitter options_____ alarm 1_____ threshold___ 0000.0ppm___ type________ disabled____ increasing__ decreasing__ On Delay____ 00min_______ Silence_____ 00min_______ Run Time____ set value___ 00min______ infinite____ name________ ALARM 1_____ alarm 2_____ alarm 3_____ Range_______ 0000.0ppm___ Hysteresis__ 0.0%Range___ Zero Buffer_ 0.0%Range___ gas label___ name________ relays______ alarm 1 norm.eng____ - 13 -...
  • Page 20 AMC-DTM-Sensor Transmitter norm.de-eng_ alarm 2 alarm 3 Fail___ test________ are you sure? advanced____ password____ enter old:__ 0___________ ------------ enter new:__ 0___________ ------------ new again:__ 0___________ Modbus______ address_____ 001_________ type________ ASCII_______ RTU_________ data rate____ 1200bps_____ 2400bps_____ 4800bps_____ 9600bps_____ 19200bps____ 38400bps____ 57600bps____ sensor______ - 14 -...
  • Page 21 AMC-DTM-Sensor Transmitter #electrodes_ 0___________ polarity____ +(positive)_ -(negative)_ ref bias____ +(positive)_ 000mV_______ -(negative)_ 000mV_______ fail detect_ manuf. data_ s/w version_ Eng. Units__ ppm_________ ppb_________ %LEL________ %VOL________ pre-configs_ ---- unconfi 86AA NH3____ 86AD NH3bla_ 91AE CO_____ 91AF CO_____ ..._________ factry test_ alignment___ unit reset__ A/D readout_ uA/mV/wiper_...

  • Page 22: Features

    AMC-DTM-Sensor Transmitter 5.3 Features The AMC Digital Transmitter Module (DTM) has the following features. 5.3.1 Keypad Inactivity While operating in Menu mode, the transmitter will automatically switch back to Display mode if keypad inactivity has been detected for a period of 10 minutes. 5.3.2 Scroll Speedup Pressing the Up or Down key for half a second starts scrolling at faster speed, 10 characters per second, until either the key is released or 1 minute has elapsed since the key was pressed.

  • Page 23: Power Up Sequence

    AMC-DTM-Sensor Transmitter 5.3.6 Power Up Sequence During power up and initialization, the transmitter displays the message “warm-up”, suppresses gas alarms and leaves fail alarm conditions unaffected. The transmitter output current is also set to the minimum value. For minimum value, see Table 4-3, 4-20mA Output Specifications. If the transmitter has an error recorded in its Flash Memory device, the error condition information is restored from Flash Memory.

  • Page 24: Type

    AMC-DTM-Sensor Transmitter 5.4.2 Type Alarm can be of three types: Increasing, Decreasing and Disabled. 5.4.3 Name Operator can specify the name of the alarm displayed on the Liquid Crystal Display (LCD). The name may have up to 12 characters and can include any of the characters displayable by the LCD.

  • Page 25: Silence Timer

    AMC-DTM-Sensor Transmitter 5.4.5 Silence Timer This feature is used to silence an alarm and to temporarily deactivate its relay output. Alarm LED and LCD displays are still shown. The Silence Timer is adjustable from 0 to 99 minutes in steps of 1 minute. A timer value of 0 disables this feature, except when Minimum Run Time is infinite.

  • Page 26: Zero Buffer

    AMC-DTM-Sensor Transmitter Decreasing alarm triggers when gas concentration stays lower than the threshold value for period of time equal to Activation Delay. It is deactivated when concentration stays above the threshold plus the hysteresis value for period of time equal to Minimum Run Time. The default Hysteresis parameter is 2% of Range.

  • Page 27: Pre-Config (Predefined Configuration)

    AMC-DTM-Sensor Transmitter %LEL: ddd%LEL Max value 499. %VOL: ddd.d%VOL if Range <= 30%VOL. ddd%VOL if Range > 30%VOL. Max value 100.0 If measured concentration is greater than the Maximum value displayable it is capped to the Maximum value. Leading zeros are not shown. 5.5.6 Pre-config (Predefined Configuration) Advisory: Changing pre-config configuration is a destructive action.

  • Page 28: Relays Option

    AMC-DTM-Sensor Transmitter 5.5.9 Relays Option The Relays functionality of the transmitter is fixed as follows: • Relay 1 – alarm 1 • Relay 2 – alarm 2 • Relay 3 – alarm 3 • Relay 4 – fail alarm All four relays can be configured as normally energized or normally de-energized. It is recommended that the Fail Alarm is normally energized and that the Gas Alarms are normally de-energized to ensure the proper operation during power failure (Fail asserted, Gas Alarms de-...

  • Page 29: Calibration Procedure

    AMC-DTM-Sensor Transmitter 6 Calibration Procedure 6.1 General Before the unit can be calibrated, the correct sensor must be set in the sensor pre-config menu. These are found in the menu “log in”, “options”, “advanced”, “pre-config”. Gas sensor is calibrated using two gas concentrations: Zero concentration and an adjustable concentration value (Span).

  • Page 30: Calibration Procedure

    AMC-DTM-Sensor Transmitter 6.2 Calibration Procedure When operator enters “calibrate” menu, “calibrate the unit?” question is presented. If the operator confirms that their intention is to calibrate the unit, the unit drives 4-20mA output to 2mA and de-asserts all gas alarms. This state is retained for 2 minutes after the calibration is over to allow gas sensor to recover from the high gas concentration applied during calibration.

  • Page 31: Using Gas Depletion As A Measure Of Another Gas's Concentration

    AMC-DTM-Sensor Transmitter 6.2.2 Span Adjustment F A1 A2 A3 ALARM 1 > 50.0%LEL Figure 6-2: Alarm 1 Menu Operator then chooses “Span” in the “calibrate” menu. Operator is then required to enter the concentration of the gas used for calibration. Operator then applies the gas used for calibration. After this is done, operator continues in the same fashion as with Zero concentration.

  • Page 32: Preventive Maintenance

    AMC-DTM-Sensor Transmitter 7 Preventive Maintenance 7.1 Maintenance The sensor/transmitter unit should be brushed or wiped clean once a year or more, depending on the accumulation, of any dust or dirt that has settle on the transmitter. 7.2 Sensor Replacement and Wiring Sensor life is typically 2 to 5 years.

  • Page 33: Sensor Interface

    AMC-DTM-Sensor Transmitter 7.2.1 Sensor Interface The AMC-DTM series transmitter accepts either a 3-wire or 2-wire electrochemical sensor. Figure 7-2 illustrates connections at terminal block TB-1 for both sensor types. The terminal block pinout for TB-1 is given in Table 7-1.

  • Page 34: Appendix A - Modbus Accessible Data

    AMC-DTM-Sensor Transmitter Appendix A - Modbus Accessible Data The Modbus functions that are supported are: 1 – Read coil 3 – Read Holding Registers 6 – Write Single Register 16 – Write Multiple Registers Modbus Accessible features Data Modbus Modbus Read/Write Register # function...
  • Page 35 AMC-DTM-Sensor Transmitter Data Modbus Modbus Read/Write Register # function Access or Coil # Alarm 2 status Coil (0-alarm is off or alarm is Coil 2 in Activation Delay state. 1-alarm is on, Silence timer is active or Run Timer is active) Alarm 3 status Coil (0-alarm is off or alarm is Coil 3 in Activation Delay state.

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