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65-2640RK-04 M2A Transmitter Operator’s Manual

Chapter 2: Description

Overview

This chapter describes the components of the M2A transmitter. The transmitter is a 4 - 20 mA type detector head.
It consists of the combustible gas detector, calibration adapter/splash guard, terminal PCB, the M2A junction
box, and the detector junction box. The two junction box configuration is intended for situations where the
detector needs to be installed at an inaccessible location. The detector junction box can be installed at the
inaccessible location and the M2A junction box can be installed in a more readily accessible area.

External Description

This section describes the junction boxes and all external components of the M2A transmitter.

Figure 1: M2A External Components

M2A

Junction

Box

3/4 NPT Conduit

Hub, Plugged

Magnetic
W and

Terminal
Strip

3/4 NPT Conduit Hub

Calibration Adapter/

Splash Guard

Combustible Gas

Detector

Detector

Junction Box

3/4 NPT

Conduit Hub

3/4 NPT
Conduit Hub

Mounting Slot (2x)

W indow

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Содержание 65-2640RK-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2640RK 04 M2A Transmitter Operator s Manual Part Number 71 0317RK Revision F Released 8 28 20...

Страница 2: ...Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings Please calibrate and maintain this instrument regularly Frequency of calibration depends...

Страница 3: ...replacement costs local repair costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTAT...

Страница 4: ...8 Internal Description 10 Chapter 3 Installation Startup 14 Overview 14 Mounting the M2A Transmitter 14 Wiring the M2A Transmitter 16 Start Up 20 Chapter 4 Operation 22 Overview 22 Normal Operation 2...

Страница 5: ...Replacing the Combustible Gas Detector 38 Chapter 8 RS 485 Modbus Output 40 Overview 40 Wiring the M2A in a Modbus System 40 Using the M2A in a 4 wire Modbus System 43 Modbus Mode 43 Supported Modbus...

Страница 6: ...s visible through the window in the cover front face and provides a 4 20 mA signal which indicates the target gas reading for use by a gas monitoring controller recording device or programmable contro...

Страница 7: ...larm Settings Alarm 1 Alarm 2 10 LEL 50 LEL Construction housing Explosion proof Junction Box NEMA 4X Area Classification Explosion proof for Class I Groups B C and D Sampling Method Diffusion Input P...

Страница 8: ...the detector needs to be installed at an inaccessible location The detector junction box can be installed at the inaccessible location and the M2A junction box can be installed in a more readily acce...

Страница 9: ...box This wiring should go through the top 3 4 NPT conduit hub Three spacers installed on the back of the junction box controls the distance of the junction box from a mounting surface Combustible Gas...

Страница 10: ...ange and an RS 485 Modbus output signal The 4 20 mA signal may be used by a recording device gas monitor controller or programmable controller The Modbus output may be used to connect the M2A to a Mod...

Страница 11: ...s Terminal Strip The Modbus terminal strip is a three position plug in style terminal strip and is the bottom terminal strip in the left terminal column It allows connection of the M2A into a Modbus n...

Страница 12: ...ushing it onto the banana jacks The jacks retain the control PCB Figure 4 Control PCB Component Location OLED Display The OLED display is located at the top of the control PCB It indicates the current...

Страница 13: ...4 Fail LED The fail LED turns on when the M2A is experiencing a fail condition A fail condition can be caused by a detector failure or low detector signal Alarm 1 LED The alarm 1 LED is on when the M...

Страница 14: ...The site should be easily accessible For the detector junction box select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heavier gas...

Страница 15: ...lyurethane tubing to the fitting at the bottom of the calibration adapter splash guard and route it to an accessible area that is close to the M2A junction box See the Chapter 9 Parts List on page 50...

Страница 16: ...tector junction box 10 Secure the detector junction box s cover to the junction box 11 Guide the other end of the four conductor shielded cable or four wires in conduit through the bottom conduit hub...

Страница 17: ...detector junction box and the M2A junction box connect the cable s drain wire to an available chassis earth ground at the M2A junction box Do not connect the shield drain wire at the detector junction...

Страница 18: ...PLC and DCS Device Wiring on page 52 then continue with step 8 Use the following recommendations to determine how to wire the M2A If Modbus connections will not be used and only the PWR SIG connectio...

Страница 19: ...junction box 5 Make controller device and relay connections as appropriate If shielded cable is used for the PWR SIG connections connect the cable shield s drain wire to an available chassis ground at...

Страница 20: ...n page 36 Verify that the M2A is in a fresh air environment environment known to be free of combustible or toxic gas vapors and of normal oxygen content 20 9 CAUTION If you suspect the presence of com...

Страница 21: ...ime out period see Viewing Changing M2A Parameters on page 27 for instructions to change the calibration time out 1 While in normal operation press and hold the UP YES button for 5 seconds to enter Ca...

Страница 22: ...tion Screen displays the M2A s operating voltage and firmware and hardware information To display the Information Screen do the following 1 Press and hold the DOWN NO button for 3 seconds The Informat...

Страница 23: ...ration If the M2A s input power decreases below 18 5 volts so that the M2A is in a low power alarm the signal output is fixed below 2 4 mA until the low power alarm is cleared If the M2A goes into a f...

Страница 24: ...to reset the alarm 1 circuit Resetting the alarm 1 circuit turns off the A1 LED resets the OLED display and de energizes the alarm 1 relay NOTE If the ENTER button is pressed while the M2A is in an al...

Страница 25: ...n Fail Condition Indications The M2A indicates a fail condition for any of the following The detector wiring is disconnected or incorrectly connected The display reading is 10 of full scale or lower W...

Страница 26: ...equence Responding to a Low Power Condition 1 Determine and correct the cause of the low power condition 2 When the input power increases above 10 0 volts the M2A will begin its warm up sequence 3 Ver...

Страница 27: ...tons when the following screen appears 2 If you want to exit Configuration Mode press and release the DOWN NO button and the M2A will return to normal operation If you want to continue in Configuratio...

Страница 28: ...at which the M2A initiates an alarm 2 condition ALARM 2 activation Increase Indicates if the alarm 2 circuit is activated by gas readings increasing Increase or decreasing Decrease to the ALARM 1 Lev...

Страница 29: ...ero suppression is 2 0 LEL the M2A will display a reading of 0 LEL for gas readings from 2 LEL to 2 LEL It is settable from 0 to 6 of the detection range FILTER 5 secs The filter feature helps smooth...

Страница 30: ...first turned on Selecting the Gas Type 1 While in normal operation or during the warm up sequence press and hold the UP YES and DOWN NO buttons for five seconds Release them when the following screen...

Страница 31: ...ressing the ENTER button display will ask SAVE IT YES NO 8 To save the configuration settings press and release the UP YES button The display will indicate Config Saved and the M2A will begin its warm...

Страница 32: ...calibrating an M2A after changing the gas type the M2A will not ask if you want to calibrate or whether you want to perform a fresh air adjustment span adjustment or zero adjustment Since a complete...

Страница 33: ...obable causes and recommended action for problems you may encounter with the M2A NOTE This troubleshooting guide describes M2A problems only If the M2A is connected to a controller see the controller...

Страница 34: ...d See Wiring the M2A Transmitter on page 16 2 Verify that the detector wiring is correct and secure 3 Increase the filter setting in Configuration Mode 4 Increase the zero suppression setting in Confi...

Страница 35: ...nto the calibration cylinder Do not use a zero air cylinder for this operation 4 Use the flexible tubing coming from the calibration adapter splash guard to connect the regulator to the calibration ad...

Страница 36: ...rocedure assumes the use of a calibration kit which includes a calibration gas cylinder a zero air cylinder and a fixed flow regulator with an on off knob NOTE The detector must be calibrated with a g...

Страница 37: ...eading press and release the UP YES button ENTER will alternate with FreshAir on the top display line and the current gas reading will be on the bottom display line To skip adjusting the fresh air rea...

Страница 38: ...te period the signal output will remain fixed at 3 5 mA and the relays will remain in their non alarm state to avoid unwanted alarms while the calibration gas clears from the detector At the end of th...

Страница 39: ...ator s Manual 39 10 Turn on or plug in power to the M2A NOTE Allow the replacement detector to warm up for 15 minutes before you continue with the next step 11 Calibrate the replacement detector as de...

Страница 40: ...12 below illustrate typical M2A wiring configurations If more than 128 M2As need to be connected together RS 485 repeater s should be used such that no more than 128 M2As reside on any given network...

Страница 41: ...should only be done if wiring for a system that is being replaced is already installed and it is not practical to run another wire See Figure 10 below for this wiring configuration In this configurat...

Страница 42: ...n an M2A that is at the end of a Modbus line Any M2A in a Modbus system that is not at the end of a line must have the termination jumper removed see Figure 11 Figure 12 below Figure 11 Multiple M2As...

Страница 43: ...ically returns to normal operation NOTE If the M2A returns to normal operation because of a time out it enters a warm up period just as it does when it is first turned on 1 While in normal operation s...

Страница 44: ...ormal operation NOTE All M2As on a Modbus network must be configured with the same baud rate and parity and each M2A must have a unique slave ID For an M2A to participate on a network the ENABLED DISA...

Страница 45: ...ading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 13 Format of Reading 0 XXX no decimal point 1 XX X 2 X XX 3 XXX 12 0 Numerical value o...

Страница 46: ...1 Register 14 Register 14 is the alarm 2 set point The decimal point location is the same as specified in Register 1 8 Fail Status 0 Fail Not Asserted 1 Fail Asserted 7 6 Alarm 2 Status 0 No Alarm 1 U...

Страница 47: ...m 1 relay reset 0 Latching 1 Self Resetting Register 26 Register 26 is the alarm 1 ON delay Integer values are in seconds Register 27 Register 27 is the alarm 1 OFF delay Integer values are in seconds...

Страница 48: ...0 and the 1st 0 Register 37 Register 37 is the calibration year Register 38 Register 38 is the calibration outcome Upper Gas Operation Lower Air Operation Calibration Outcome Codes 1 Sensor Missing 2...

Страница 49: ...ction Code 16 see Appendix C Function Code 16 Registers on page 54 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With the...

Страница 50: ...ation cylinder 50 LEL hydrogen in air 103 liter 81 0004RK 01 Calibration cylinder 50 LEL propane in air 34 liter steel 81 0004RK 03 Calibration cylinder 50 LEL propane in air 103 liter 81 0007RK 01 Ca...

Страница 51: ...utton Quick Reference Chart Mode Entered or Function Performed Button Combination Adjustable or Viewable Parameters Alarm Reset Press and Release ENTER n a Show Information Screen Press and Hold DOWN...

Страница 52: ...PWR SIG terminal strip connections and one or more relays are used route the connections to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded cable or in...

Страница 53: ...LC and DCS Device Wiring Alarm Device Power Fail Alarm Device Alarm 1 Alarm Device 24 VDC 24 VDC Power Supply 24 VDC Typical Alarm Wiring Shown 24 VDC 4 20 mA In S Alarm 2 Alarm Device C NC NO ALARM 1...

Страница 54: ...y Energized Register 4 Register 4 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 5 Register 5 is the alarm 1 ON delay Integer value is in seconds Register 6 Register 6 is the alarm 1...

Страница 55: ...e is in minutes 5 10 15 20 25 or 30 Register 16 Register 16 is explained in Supported Modbus Functions in the M2A manual Register 17 Register 17 is the calibration month MSB and day LSB This is zero b...

Страница 56: ...65 2640RK 04 M2A Transmitter Operator s Manual 56 Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configuration 1 Reset Alarm...

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