RKI Instruments 65-2658RK-CH4-4 Operator'S Manual Download Page 1

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RKI Instruments, Inc.

www.rkiinstruments.com

65-2658RK-CH4-4

M2A Transmitter

Operator’s Manual

Part Number: 71-0461

Revision: D

Released: 8/28/20

Summary of Contents for 65-2658RK-CH4-4

Page 1: ...RKI Instruments Inc www rkiinstruments com 65 2658RK CH4 4 M2A Transmitter Operator s Manual Part Number 71 0461 Revision D Released 8 28 20...

Page 2: ...h 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 depend...

Page 3: ...or 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 REPRESENT...

Page 4: ...n 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...

Page 5: ...ime 35 Calibration 36 Replacing the IR CH4 Detector 38 Chapter 8 RS 485 Modbus Output 39 Overview 39 Wiring the M2A in a Modbus System 39 Using the M2A in a 4 wire Modbus System 42 Modbus Mode 42 Supp...

Page 6: ...ch 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 programmable co...

Page 7: ...arm 1 Alarm 2 100 100 Construction housing Explosion proof Junction Box NEMA 4X Area Classification Explosion proof for Class I Groups B C and D Sampling Method Diffusion Input Power 10 30 VDC Control...

Page 8: ...re 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 ac...

Page 9: ...erminal 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...

Page 10: ...range 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 Mo...

Page 11: ...page 16 for all wiring procedures related to M2A Modbus 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...

Page 12: ...nana jacks in the terminal PCB mounting standoffs and pushing it onto the banana jacks The jacks retain the control PCB Figure 4 Control PCB Component Location OLED Display The OLED display is located...

Page 13: ...e 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...

Page 14: ...s 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 ga...

Page 15: ...le 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 List on pag...

Page 16: ...h the top conduit hub of the detector junction box To make wiring more convenient use wire colors that correspond to the detector wire colors red white green and black 9 Connect the wires to the termi...

Page 17: ...he opposite end of the cable s drain wire to the M2A junction box s chassis earth ground Figure 7 Wiring the Detector to the M2A 14 Reinstall the detector terminal strip into its socket 15 If shielded...

Page 18: ...th 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 connections will be used use a two or three conductor shielded...

Page 19: ...he 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...

Page 20: ...h Air Signal Adjustment If the M2A is installed in a classified area and non intrusive zero adjustment is required follow the instructions below but do not remove the junction box cover Use the magnet...

Page 21: ...e display will indicate SPAN w Cal Gas Skip to the next section Adjusting the Span Setting 4 Screw the zero air cylinder into the fixed flow regulator 5 Use the flexible tubing coming from the calibra...

Page 22: ...mation 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 Inform...

Page 23: ...peration 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...

Page 24: ...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 alar...

Page 25: ...ail 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 When...

Page 26: ...sequence 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 Ve...

Page 27: ...buttons 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 Configura...

Page 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...

Page 29: ...ther than 0 0 such as 1 0 the M2A will display a reading of 0 0 for gas readings from 1 0 volume to 1 0 volume The zero suppression is settable from 0 to 6 of the detection range FILTER 5 secs The fil...

Page 30: ...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 appears 2 If you want to exit Gas...

Page 31: ...pressing 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 war...

Page 32: ...n 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...

Page 33: ...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 operato...

Page 34: ...hielded 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...

Page 35: ...n the regulator s on off knob counterclockwise to open the regulator Gas will begin to flow Take note of the time or start a stopwatch 6 When you first start to notice an increase in the gas reading n...

Page 36: ...is no switch activity for the calibration time out period the unit will return to normal operation See Viewing Changing M2A Parameters on page 27 for instructions to set the calibration time out NOTE...

Page 37: ...ro air cylinder into the fixed flow regulator 5 Use the flexible tubing coming from the calibration adapter splash guard to connect the regulator to the calibration adapter 6 Turn the regulator knob c...

Page 38: ...e period the REMOVE CAL GAS message will stop appearing and the M2A will return to normal operation 10 Disconnect the calibration adapter splash guard s flexible tubing from the regulator NOTE Do not...

Page 39: ...e 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...

Page 40: ...s 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 configura...

Page 41: ...in 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...

Page 42: ...atically 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...

Page 43: ...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 the ENABLED DI...

Page 44: ...Reading 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...

Page 45: ...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...

Page 46: ...rm 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 second...

Page 47: ...y 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...

Page 48: ...unction Code 16 see Appendix C Function Code 16 Registers on page 53 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With t...

Page 49: ...volume IR type 71 0461 65 2658RK CH4 4 M2A Transmitter Operator s Manual this document 81 0013RK 01 Calibration cylinder 50 volume CH4 in nitrogen 34 liter steel 81 0076RK 01 Zero air calibration cyl...

Page 50: ...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 Screen Press and Hold DOW...

Page 51: ...he 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...

Page 52: ...PLC 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...

Page 53: ...0 Normally De Energized 1 Normally 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 Regi...

Page 54: ...5 second increments Register 15 Register 15 is the calibration timeout Value is in minutes 5 10 15 20 25 or 30 Register 16 Register 16 is explained in Supported Modbus Functions in the M2A manual Reg...

Page 55: ...Transmitter Operator s Manual 55 Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configu...

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