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Chapter 7: Maintenance

M2A-XL Transmitter Operator’s Manual

Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the M2A-XL.

NOTE:

This troubleshooting guide describes M2A-XL problems only. If the M2A-XL is
connected to a controller, see the controller operator’s manual for problems you may
encounter with the controller.

Table 14: Troubleshooting the M2A-XL

Condition

Symptom(s)

Probable Causes

Recommended Action

No Power

The display back

-

light is off and the
display screen is
blank.

• The power wiring is

disconnected or
misconnected.

• The display cable is

disconnected or
misconnected.

1. Verify that the 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 connector on the top edge of
the control PCB and on the bottom of the
terminal PCB.

3. If the power difficulties continue, contact

RKI for further instruction.

Frequent or
Suspect
Alarms

The M2A-XL alerts
you to
frequent or suspect
alarms while the
fresh air
readings remain on
zero (20.9 for oxy

-

gen).

• The M2A-XL is

experiencing false
readings due to RFI or
EMI.

• The detector wiring is

disconnected,
misconnected, or
intermittent.

1. Verify that the M2A-XL wiring is

properly shielded. See “Wiring the M2A-
XL Transmitter” on page 30.

2. Verify that the detector wiring is correct

and secure.

3. Increase the alarm on delay setting in

Configuration Mode.

4. If the frequent or suspect alarm

difficulties continue, contact RKI for
further instruction.

Flickering
Display

The display reading
flickers often.

• The M2A-XL is

experiencing false
readings due to RFI or
EMI.

• The noise filter setting is

too low.

• The zero suppression

setting is too low.

• The display screen is

malfunctioning.

1. Verify that the M2A-XL wiring is

properly shielded. See “Wiring the M2A-
XL Transmitter” on page 30.

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

Configuration Mode.

5. If the display difficulties continue,

contact RKI for further instruction.

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Содержание M2A-XL

Страница 1: ...RKI Instruments Inc www rkiinstruments com M2A XL Transmitter Operator s Manual Part Number 71 0610 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: ...cates 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 approval TH...

Страница 4: ...2A XL Transmitter 25 Wiring the M2A XL Transmitter 30 Start Up 38 Chapter 4 Operation 41 Overview 41 Normal Operation 41 Information Screen 41 4 20 mA Signal Output Operation 42 Alarm Indications 43 C...

Страница 5: ...485 Modbus Output 73 Overview 73 Wiring the M2A XL in a Modbus System 73 Using the M2A XL in a 4 wire Modbus System 77 Modbus Mode 77 Supported Modbus Functions 79 Chapter 9 Parts List 85 Appendix A C...

Страница 6: ...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 control...

Страница 7: ...en Oxygen O2 0 25 0 volume 0 1 increments CO H2S Carbon Monoxide CO 0 300 ppm 1 ppm increments Carbon Monoxide CO 0 200 ppm 1 ppm increments Carbon Monoxide CO 0 100 ppm 1 ppm increments Hydrogen Sulf...

Страница 8: ...50 ppm 1 00 ppm Combustible Gas LEL 10 LEL 50 LEL Combustible Gas 0 100 Volume 100 100 Hydrogen Cyanide 5 0 ppm 10 0 ppm Hydrogen Sulfide 0 50 ppm 5 0 ppm 10 0 ppm Hydrogen Sulfide 0 100 ppm 10 ppm 5...

Страница 9: ...7 Series N A 20 C to 40 C Infrared Combustible 20 C to 50 C 40 C to 50 C Infrared CO2 20 C to 50 C 40 C to 50 C Accuracy Catalytic Combustible Gas LEL range 5 of reading or 2 LEL whichever is greater...

Страница 10: ...4 NPT conduit ports to mount the detector to the junction box factory installed in the bottom port and connect wiring from an external device left port The top port is shipped with a factory installe...

Страница 11: ...ctor senses the target gas and is mounted in a 3 4 NPT conduit port on the right bottom side of the M2A XL A variety of detectors may be used with the M2A XL See the sections below for descriptions of...

Страница 12: ...ed IR detectors Table 3 Infrared IR Detectors Target Gas Range M2A XL Part Number Detector Used CH4 0 100 LEL 65 2649RK CH4 61 0190RK CH4 UL 65 2664RK CH4 61 0197RK CH4 CH4 0 5 00 volume 65 2649RK CH4...

Страница 13: ...entire oxygen detector must be removed if replacement is required for the 65 2510RK CO2 0 50 volume 65 2660RK 05 61 0191RK 05 UL 65 2661RK 05 61 0198RK 05 CO2 0 100 volume 65 2660RK 10 61 0191RK 10 U...

Страница 14: ...ence between the 65 2428 and the 65 2428 01 is that the sensor used in the 65 2428 01 is resistant to degradation caused by frequent exposure to low levels of H2S or occasional exposure to high levels...

Страница 15: ...05 65 2438 CSA 65 2663RK 65 2496RK CO 0 200 ppm 65 2646RK 05 02 65 2438 01 CO 0 100 ppm 65 2646RK 05 01 65 2438 01 H2S 0 100 ppm 65 2645RK 05 65 2428 CSA 65 2645 05 07 65 2428 01 CSA 65 2662RK 65 249...

Страница 16: ...e the splashguard to allow access to the sensor that protrudes through the detector housing cap You can then push the appropriate ESM 01 calibration cup onto the sensor The table below outlines the M2...

Страница 17: ...s for the CT 7 Series detectors Table 7 CT 7 Series Detectors Target Gas Range M2A XL Part Number Detector Used Cl2 0 3 ppm 65 2670 CL2 3 65 2302 CL2 3 Cl2 0 5 ppm 65 2670 CL2 5 65 2302 CL2 5 Cl2 0 10...

Страница 18: ...670 NH3 2 65 2302 NH3 2 NH3 0 500 ppm 65 2670 NH3 5 65 2302 NH3 5 SO2 0 10 ppm 65 2670 SO2 10 65 2302 SO2 10 Table 7 CT 7 Series Detectors Target Gas Range M2A XL Part Number Detector Used Hydrophobic...

Страница 19: ...hree standoffs and rests on a thin layer of foam A banana jack is screwed into each of the standoffs and is used for mounting the control PCB The terminal PCB converts the electrical output from the d...

Страница 20: ...t Figure 10 Terminal PCB Component Location Power Signal Terminal Strip The power signal terminal strip is a three position plug in style terminal strip located at the top of the left terminal column...

Страница 21: ...l strips consists of from top to bottom 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 s...

Страница 22: ...g standoffs and pushing it onto the banana jacks The jacks retain the control PCB Figure 12 Control PCB Component Location OLED Display The OLED display is located at the top of the control PCB It ind...

Страница 23: ...is not possible to actuate two magnetic switches at once with only one magnetic wand Since displaying the Information Screen only requires the use of one switch the wand may be used to show the Inform...

Страница 24: ...alarm 1 LED is on when the M2A XL is experiencing an alarm 1 condition Alarm 2 LED The alarm 2 LED is on when the M2A XL is experiencing an alarm 2 condition RX TX LED s These LED s indicate data bein...

Страница 25: ...m start up maintenance and calibration procedures Select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heavier gases mount the detec...

Страница 26: ...nsions Catalytic LEL and ppm CSA Version Figure 15 Outline Mounting Dimensions IR Combustible CO2 3 4 NPT Conduit Port Plugged 2 3 max 1 00 4 86 3 4 NPT Conduit Port 0 25 2X 5 5 5 66 2 82 6 2 7 8 max...

Страница 27: ...Outline Mounting Dimensions Replaceable Sensor H2S CO and Oxygen Non Explosion Proof 3 4 NPT Conduit Port Plugged 1 1 2 20 For Calibration Cup 2 6 max 1 00 4 86 3 4 NPT Conduit Port 0 25 2X 5 5 5 66...

Страница 28: ...n Startup M2A XL Transmitter Operator s Manual Figure 18 Outline Mounting Dimensions H2S CO and Oxygen CSA Explosion Proof 3 4 NPT Conduit Port Plugged 1 00 3 4 max 3 4 NPT Conduit Port 0 25 2X 5 5 5...

Страница 29: ...itter Operator s Manual Chapter 3 Installation Startup 29 Figure 19 Outline Mounting Dimensions ESM 01 Toxic 3 4 NPT Conduit Port Plugged 4 82 max 1 00 4 86 3 4 NPT Conduit Port 0 25 2X 5 5 5 66 2 82...

Страница 30: ...are not to pull too hard and damage the cable which connects the control and terminal PCBs 4 Let the control PCB hang by the cable The terminal strips are now visible on the terminal PCB The control P...

Страница 31: ...L R white wire to terminal labeled LEL W green wire to terminal labeled LEL G black wire to terminal labeled LEL B Figure 21 Catalytic LEL and ppm Detector Wiring Figure 22 IR Combustible IR CO2 Detec...

Страница 32: ...labeled OXY Figure 23 Partial Pressure Oxygen Detector Wiring Figure 24 CSA Capillary Type Oxygen Detector Wiring Figure 25 Capillary Type Replaceable Sensor Oxygen Detector Wiring Green White C NC NO...

Страница 33: ...TOXIC Figure 26 H2S CO Detector Wiring CSA Non Explosion Proof CO or H2S Gas Detectors Red wire to terminal labeled TOXIC black wire to terminal labeled TOXIC Figure 27 H2S CO Detector Wiring Black R...

Страница 34: ...lor coded wire Connect the color coded wire see chart below to the terminal labeled TOXIC and the black wire to the terminal labeled TOXIC Figure 28 ESM 01 Toxic Detector Wiring Black Brown AsH3 Yello...

Страница 35: ...ge to the terminal strip The detector terminal strip and the alarm 1 relay terminal strip may be removed by grasping them with your fingers if the adjacent terminal strips have been removed WARNING If...

Страница 36: ...onduit port 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 the junction box s hazardous location r...

Страница 37: ...ctions Make sure any wire or cable used for relay wiring is appropriately rated for the power that it will carry NOTE If shielded cable is used for the PWR SIG connections leave the cable shield s dra...

Страница 38: ...that all wiring connections are correct and secure 3 Turn on the incoming power 4 If necessary turn on the controller or other monitoring device that is connected to the M2A XL 5 The OLED display will...

Страница 39: ...t do not remove the junction box cover Use the magnetic wand accessory to actuate the magnetic switches instead of pushing the control switch buttons To actuate a magnetic switch and perform the same...

Страница 40: ...Cal Gas 5 Press and release the DOWN NO button The display will indicate Leaving CAL Mode and the M2A XL will return to normal operation Oxygen Version Adjusting the Fresh Air Reading 1 While in norma...

Страница 41: ...M2A XL Information Screen The Information Screen displays the M2A XL s operating voltage and firmware and hardware information To display the Information Screen do the following 1 Press and hold the...

Страница 42: ...ration is performed In this situation the signal output will be fixed at 3 5 mA for LEL and toxic versions and 17 4 mA for oxygen versions from the time Gas Type Mode is entered until the M2A XL is ca...

Страница 43: ...for O2 gas reading at or above the alarm 1 set point A1 LED is on Gas reading alternates with ALARM 1 message Alarm 2 Increasing gas reading at or above the alarm 2 setpoint A2 LED is on Gas reading...

Страница 44: ...s the alarm 1 relay NOTE If the ENTER button is pressed while the M2A XL is in an alarm 1 condition the A1 LED will flash but all other indications will remain unchanged You cannot de energize the ala...

Страница 45: ...il condition for any of the following The detector wiring is disconnected or incorrectly connected The plug in sensor is not properly plugged into the socket in the detector housing body NOTE It could...

Страница 46: ...input voltage is displayed on the bottom line of the OLED display The fail relay de energizes NOTE The low power alarm cannot be cleared using the ENTER button When the voltage increases to 10 0 volts...

Страница 47: ...Changing M2A XL 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 48: ...tiated It can 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 minutes A1 OffDy alarm 1 off delay 0 sec The amount of ti...

Страница 49: ...ng For example if the zero suppression setting for a combustible LEL detector is 2 0 LEL the M2A XL will display a reading of 0 LEL for gas readings from 2 LEL to 2 LEL It is setta ble from 0 to 6 of...

Страница 50: ...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 UP YES b...

Страница 51: ...d 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 appears 2 I...

Страница 52: ...the highest displayed value Anything higher is displayed as OVER Table 13 Toxic Oxygen Gas Types Gas Type Choices Detection Range H2S 0 100 ppm CO 0 300 ppm CO 0 200 ppm CO 0 100 ppm CL2 0 3 00 ppm C...

Страница 53: ...meter setting and move to the next one Use the UP YES and DOWN NO buttons to adjust a setting See Chapter 5 Configuration Mode on page 47 for a complete description of Configuration Mode 7 When you ha...

Страница 54: ...e after changing the gas type 11 See Calibration Combustible Gas CO2 and Toxic Versions on page 58 or Calibration Oxygen Version on page 63 for calibration instructions NOTE When calibrating an M2A XL...

Страница 55: ...formance of the M2A XL It includes daily quarterly and biannual procedures Daily Verify a display reading of zero 20 9 for an oxygen M2A XL Investigate significant changes in the reading Quarterly Cal...

Страница 56: ...continue contact RKI for further instruction Frequent or Suspect Alarms The M2A XL alerts you to frequent or suspect alarms while the fresh air readings remain on zero 20 9 for oxy gen The M2A XL is e...

Страница 57: ...n the detector housing cap is blocked with dirt of some other particulate contamination For CT 7 Series detectors The hydrophobic membrane on the plug in sensor face is blocked with dirt or some other...

Страница 58: ...ncy of every 6 months for a non IR M2A XL or 12 months for an IR M2A XL is adequate If an application is very demanding for example if a combustible or toxic gas is present often and in significant co...

Страница 59: ...of the magnetic wand to the M2A XL s glass cover directly above the magnetic switch you wish to actuate Touching the glass and removing the wand is the same as pressing and releasing a button Touchin...

Страница 60: ...ClO2 be sure the M2A XL has been on for 15 minutes before performing a calibration For ClO2 be sure the M2A XL has been on for 2 3 hours before performing a calibration WARNING RKI Instruments Inc re...

Страница 61: ...inder into the fixed flow regulator 5 Turn the regulator knob counterclockwise to open the regulator 6 Allow zero air to flow for two minutes If there was gas present causing a reading on the M2A XL t...

Страница 62: ...he calibration cup from the detector For an ESM 01 detector pull the calibration cup off of the ESM 01 sensor and screw the splashguard back onto the detector housing cap The M2A XL will continue to d...

Страница 63: ...s will remain in their non alarm state while the M2A XL is in Calibration Mode The output signal will not indicate current readings and the relays will not resume operating normally until the M2A XL i...

Страница 64: ...sh air adjustment the M2A XL will freeze the display reading at the highest response and the M2A XL will continue to display this reading and retain it in its memory until the fresh air adjustment pro...

Страница 65: ...to continue with adjusting the zero setting press and release the UP YES button APPLY will alternate with ZERO Gas on the top display line and the current oxygen reading will be on the bottom display...

Страница 66: ...placing Components of the M2A XL Replacing the Gas Detector NOTE For M2A XL versions that do not have a replaceable plug in sensor or if you determine that it is necessary to replace the entire detect...

Страница 67: ...replacement detector leads through the bottom conduit port of the junction box then screw the mounting threads of the detector into the conduit port If necessary for environmental conditions apply thr...

Страница 68: ...if necessary Be sure the ribbon cable is routed down below the control PCB so it will not be damaged by the cover when it is screwed back on 13 Secure the junction box cover to the junction box 14 Tur...

Страница 69: ...not removed Figure 31 Plug In Sensor Jumper Removal 6 If you are replacing a CO sensor install the rubber boot and charcoal filter onto the new sensor s face If you are replacing the 65 2428 explosio...

Страница 70: ...sure that the cap gasket is in place and screw the detector cap back onto the housing body 6 Turn on or reconnect power to the M2A XL Replacing an Oxygen Plug in Sensor NOTE This procedure is applicab...

Страница 71: ...If the splash guard was unscrewed from the detector cap screw it back onto the detector cap 7 Turn on or reconnect power to the M2A XL NOTE Allow the replacement sensor to warm up for 15 minutes befor...

Страница 72: ...the white hydrophobic membrane from the sensor face with a small flat blade screwdriver or a similar tool 5 Peel off the hydrophobic membrane It may be necessary to clean off the sensor face to remov...

Страница 73: ...n be found online at www modbus org specs php The Modbus protocol supports a maximum of 247 unique slave addresses 1 247 The M2A XL s line driver provides for up to 128 M2As to be connected together w...

Страница 74: ...uration 5 wires are used for wiring the M2A XL into a Modbus system Figure 32 also illustrates typical alarm device wiring The ground jumper must be removed in this wiring configuration Figure 32 Reco...

Страница 75: ...bus 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 configuration Figure 33...

Страница 76: ...ination jumper removed see Figure 34 Figure 35 below Figure 34 Multiple M2As in a Daisy Chain Configuration Figure 35 Multiple M2As in a Two Branch Configuration Modbus Master Up to 128 M2As can be co...

Страница 77: ...XL automatically returns to normal operation NOTE If the M2A XL 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 norm...

Страница 78: ...to normal operation NOTE All M2As on a Modbus network must be configured with the same baud rate and parity and each M2A XL must have a unique slave ID For an M2A XL to participate on a network the EN...

Страница 79: ...egisters 1 2 is shown below in Table 17 Table 18 Table 17 Register 1 Numerical Reading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 13 Fo...

Страница 80: ...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 Unused Code 3 Overscale Status 0 No...

Страница 81: ...egister 14 is the alarm 2 set point The decimal point location 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 Regi...

Страница 82: ...n seconds Register 32 Register 32 is the alarm 2 OFF delay Integer values are in seconds Register 33 Register 33 is zero suppression Toxics and LEL 0 6 of full scale Oxygen 0 0 7 Oxygen The decimal po...

Страница 83: ...libration Is Overscale 12 LEL Sensor Offset Is Too High 13 LEL Null Operation Failed 14 Operation Not Performed Register 39 Register 39 is the auto zero disable 0 AutoZero Enabled 1 AutoZero Disabled...

Страница 84: ...M2A XL It is useful for remotely silencing alarms With the M2A XL in an alarm condition bit 0 can be used to silence it NOTE Register 40 in Function Code 03 the remote configuration register must be...

Страница 85: ...140RK 05 LEL detector catalytic type CSA version 61 0140RKA CH4 ppm detector catalytic type UL version 61 0140RKA 05 CH4 ppm detector catalytic type CSA version 61 0190RK CH4 CH4 0 100 LEL 0 5 00 volu...

Страница 86: ...membrane for 65 2302 SO2 10 detector 65 2039RK Plug in H2S sensor for 65 2428 01 detector 65 2049 01 CT 7 Series plug in sensor 0 15 0 ppm HCN with membrane for 65 2302 HCN 15 detector 65 2051 01 CT 7...

Страница 87: ...10 CT 7 Series detector 0 10 0 ppm sulfur dioxide includes sensor 65 2428 H2S detector assembly 0 100 ppm CSA version includes plug in sensor 65 2428 01 H2S detector assembly CSA version for frequent...

Страница 88: ...cylinder CO2 2 000 ppm in nitrogen 103 liter 81 0071RK 01 Calibration cylinder CO2 5 000 ppm in nitrogen 34 liter steel 81 0071RK 03 Calibration cylinder CO2 5 000 ppm in nitrogen 103 liter 81 0072RK...

Страница 89: ...ob 0 25 LPM for 34 liter aluminum 58 liter 103 liter cylinders Used to calibrate NH3 ESM 01 M2A XL only 81 1103RK Calibration cup for 3 4 NPT IR detectors 81 1117RK Calibration cup for catalytic LEL p...

Страница 90: ...01 plug in sensor 0 3 00 ppm chlorine ESM K01D CL2 10 ESM 01 plug in sensor 0 10 0 ppm chlorine NC 6205 01 Hydrogen specific LEL detector catalytic type UL version NC 6205 05 Hydrogen specific LEL de...

Страница 91: ...Table 21 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 Screen P...

Страница 92: ...strip If the PWR SIG terminal strip connections and one or more relays are used route the connections to the M2A XL in conduit Use shielded cable in the conduit for the PWR SIG connections and unshie...

Страница 93: ...XL Figure 36 PLC and DCS Device Wiring Alarm 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 24 VDC Alarm 2 Alarm Device S...

Страница 94: ...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 Regis...

Страница 95: ...y Integer value 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 1...

Страница 96: ...t the controller This register can be used to clear those flags Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is the Remote Configurati...

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