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Chapter 2: Description

65-2640XL-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

Terminal
Strip

M2A-XL

Junction

Box

Mounting Hole (2x)

3/4 NPT Conduit Hub

Magnetic
W and

3/4 NPT
Conduit Hub

3/4 NPT

Conduit Hub

Calibration Adapter/

Splash Guard

Combustible G as

Detector

Detector

Junction Box

W indow

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Содержание 65-2640XL-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2640XL 04 M2A Transmitter Operator s Manual Part Number 71 0611 Revision P1 Released 10 20 22...

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: ...indicates the full extent of our liability and we are not responsible for removal or replacement costs local repair costs transportation costs or contingent expenses incurred without our prior approv...

Страница 4: ...8 Internal Description 10 Chapter 3 Installation Startup 15 Overview 15 Mounting the M2A Transmitter 15 Wiring the M2A Transmitter 17 Start Up 22 Chapter 4 Operation 24 Overview 24 Normal Operation 2...

Страница 5: ...Replacing the Combustible Gas Detector 44 Chapter 8 RS 485 Modbus Output 45 Overview 45 Wiring the M2A in a Modbus System 45 Using the M2A in a 4 wire Modbus System 49 Modbus Mode 49 Supported Modbus...

Страница 6: ...lay which is 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 programm...

Страница 7: ...increments Alarm 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 Diffu...

Страница 8: ...ded 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 installe...

Страница 9: ...minal strip The other side of the terminal strip is for user supplied wiring to the detector terminal strip located in the M2A junction box This wiring should go through the top 3 4 NPT conduit hub Th...

Страница 10: ...ntrusive calibration can be performed Internal Description This section describes the internal components of the M2A The internal components of the M2A include the terminal PCB which provides for all...

Страница 11: ...olumn on the right consists of the relay terminal strips A 20 position connector at the bottom of the terminal PCB is used to connect the terminal PCB to the control PCB with a ribbon cable A 5 positi...

Страница 12: ...the fail alarm 1 and alarm 2 relay terminal strips They are three position plug in style terminal strips The relay terminal strips are used to connect devices such as lights and horns that are control...

Страница 13: ...ons The M2A includes three push button switches that allow you to enter the M2A s operating modes navigate through the modes update settings and save changes to the settings The push button switches a...

Страница 14: ...n page 24 Status LEDs The M2A includes five status LEDs that are located above the display see Figure 4 Fail LED The fail LED turns on when the M2A is experiencing a fail condition A fail condition ca...

Страница 15: ...cedures 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 heav...

Страница 16: ...I D flexible polyurethane 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 L...

Страница 17: ...ication of the junction boxes conduit seals must be installed as shown in Figure 7 Adhere to your local electrical code when installing the conduit seal 8 Guide multi conductor shielded cable or cable...

Страница 18: ...ave been removed 13 Pull out the detector terminal strip and connect the four wires to the terminal strip as follows see Figure 7 Connect the wire corresponding to the detector s red wire to the LEL R...

Страница 19: ...arth ground at the M2A junction box Do not connect the shield drain wire at the detector junction box Black Green White Red Detector Terminal Strip C NC NO ALARM 1 C NC NO ALARM 2 C NC NO F AI L Cable...

Страница 20: ...dbus output is used WARNING If the top conduit hub is used for wiring be sure to seal the threads to ensure water does not enter the junction box A conduit seal which is normally required to maintain...

Страница 21: ...Output on page 45 See Figure 8 below for field wiring connections to the M2A Figure 8 Wiring the M2A Junction Box to a Controller and Alarm Devices 3 Re install the control PCB and ribbon cable if ne...

Страница 22: ...e Calibration on page 40 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...

Страница 23: ...nt a different time out period see Viewing Changing M2A Parameters on page 29 for instructions to change the calibration time out 1 While in normal operation press and hold the UP YES button for 5 sec...

Страница 24: ...he Information 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 Th...

Страница 25: ...ll continue to indicate this until Calibration Mode is entered and a calibration is performed In this situation the signal output will be fixed at 3 5 mA from the time Gas Type Mode is entered until t...

Страница 26: ...alerts you to an alarm 1 condition as follows The A1 LED turns on The gas reading alternates with the ALARM 1 message The alarm 1 relay energizes Table 4 Visual and Audible Alarm Indications Condition...

Страница 27: ...senses an alarm 2 condition The M2A alerts you to an alarm 2 condition as follows The A2 LED turns on The gas reading alternates with the ALARM 2 message The alarm 2 relay energizes NOTE If the M2A i...

Страница 28: ...is 9 5 volts or less WARNING While in a low power condition the M2A is not an active gas monitor When the M2A senses a low power condition it alerts you as follows The F LED turns on The message LowPo...

Страница 29: ...ng Changing M2A Parameters 1 While in normal operation simultaneously press and hold the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following scree...

Страница 30: ...n be set in 1 sec ond increments from 0 60 seconds in 1 minute increments from 1 15 minutes and in 15 minute increments from 15 60 min utes A1 OffDy alarm 1 off delay 0 sec The amount of time the M2A...

Страница 31: ...play 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 out jumpy or noisy signals from the detecto...

Страница 32: ...s the UP YES button to return to normal operation If you wish to change some of the adjustments made press and release the DOWN NO button The DO OVER YES NO message will display Press and release the...

Страница 33: ...arm up period just as it does when it is 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 second...

Страница 34: ...ration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed 6 While in Configuration Mode press and release the ENTER button to accept the displayed param...

Страница 35: ...he display will indicate CAL NEEDED Since the gas type has been changed a successful calibration must be performed before the M2A can enter normal operation 10 Press and release the UP YES button to e...

Страница 36: ...ceable parts Preventive Maintenance This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2A It includes daily and quarterly procedures Daily V...

Страница 37: ...he wiring to the power source or controller is correct and secure 2 Verify that the ribbon cable connecting the terminal PCB to the control PCB is securely installed This ribbon cable plugs into a con...

Страница 38: ...RKI for further instruction Fail Condi tion M2A indicates a fail condition Controllerindicates a fail condition The detector wiring to the terminal PCB is disconnected or misconnected The wiring from...

Страница 39: ...r Unable to Calibrate Unable to successfully set the fresh air or span reading during calibration M2A requires frequent calibration NOTE See Calibration Frequency on page 39 for calibration frequency...

Страница 40: ...ed between starting the gas flow and noticing a reading response 7 Turn the regulator s on off knob clockwise to close the regulator 8 Unscrew the regulator from the calibration cylinder 9 Disconnect...

Страница 41: ...instead of pushing the control switch buttons To actuate a magnetic switch and perform the same operation as pressing a control switch button touch the magnet in the end of the magnetic wand to the M2...

Страница 42: ...ible tubing coming from the calibration adapter splash guard to connect the regulator to the calibration adapter 6 Turn the regulator knob counterclockwise to open the regulator 7 Allow zero air to fl...

Страница 43: ...0 LEL 8 The M2A will perform a span operation The display will indicate SPAN Gas PASS for a few seconds then indicate SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds NOTE If the sp...

Страница 44: ...detector through the bottom conduit hub of the detector junction box then screw the mounting threads of the detector into the conduit hub If necessary for environmental conditions apply thread sealant...

Страница 45: ...igure 11 Figure 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...

Страница 46: ...iring Adding an M2A to an Existing M2 Modbus Installation with Recommended Wiring An M2A can be wired into an existing M2 Modbus system The shape of the terminal PCB will be different but the wiring c...

Страница 47: ...on terminal on the Modbus controller is omitted Instead the Common terminal on the Modbus controller is connected to the of the 24 VDC power supply The ground jumper must be installed in this wiring c...

Страница 48: ...nation jumper removed see Figure 11 Figure 12 below Figure 11 Multiple M2As in a Daisy Chain Configuration Figure 12 Multiple M2As in a Two Branch Configuration ID 125 Modbus Master Up to 128 M2As can...

Страница 49: ...the M2A automatically 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 no...

Страница 50: ...M2A returns to normal 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...

Страница 51: ...or registers 1 2 is shown below in Table 10 Table 11 Table 10 Register 1 Numerical Reading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 1...

Страница 52: ...ail Not Asserted 1 Fail Asserted 7 6 Alarm 2 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 5 4 Alarm 1 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unu...

Страница 53: ...n is the same as specified in Register 1 Registers 15 19 Registers 15 19 are the Gas Name ASCII String NULL Terminated Registers 20 22 Registers 20 22 are the Gas Units String NULL Terminated Register...

Страница 54: ...in seconds Register 33 Register 33 is zero suppression Toxics and LEL 0 6 of full scale Oxygen 0 0 7 Oxygen The decimal point location is the same as specified in Register 1 Register 34 Register 34 i...

Страница 55: ...ion register access level 0 None 1 Alarm Reset Function Code 16 Write Registers There are 21 registers in Function Code 16 that can be used to write to the M2A This manual only describes Register 16 b...

Страница 56: ...inder 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 Calibration...

Страница 57: ...tting Table 14 Control Button Quick Reference Chart Mode Entered or Function Performed Button Combination Adjustable or Viewable Parameters Alarm Reset Press and Release ENTER n a Show Information Scr...

Страница 58: ...rminal strip If the 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 uns...

Страница 59: ...the M2A Figure 13 PLC and DCS Device Wiring S PWR SIG Alarm 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown A B C RS 485 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 2...

Страница 60: ...g 1 Increasing Register 3 Register 3 is the alarm 1 relay state 0 Normally De Energized 1 Normally Energized Register 4 Register 4 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 5 Reg...

Страница 61: ...is in seconds Register 13 Register 13 is the zero suppression Toxics and LEL 0 6 Full Scale Oxygen 0 0 7 Oxygen Value must be an integer Any decimals are omitted Register 14 Register 14 is the noise...

Страница 62: ...This register can be used to clear those flags Table 16 Register 19 Clear Change Flags Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is...

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