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RKI M2A Operator's Manual

Rig monitor for hydrogen sulfide
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M2A Rig Monitor
for Hydrogen Sulfide
Operator's Manual
Part Number: 71-0399
Revision: 0
Released: 9/20/18
RKI Instruments, Inc.
www.rkiinstruments.com

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Summary of Contents for RKI M2A

  • Page 1 M2A Rig Monitor for Hydrogen Sulfide Operator’s Manual Part Number: 71-0399 Revision: 0 Released: 9/20/18 RKI Instruments, Inc. www.rkiinstruments.com...
  • Page 2 Frequency of calibration depends upon the type of use you have and the sensor types. Typical calibration frequencies for most applications are between 3 and 6 months, but can be required more often or less often based on your usage. M2A Rig Monitor Operator’s Manual...
  • Page 3 Product Warranty RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.

  • Page 4: Table Of Contents

    Mounting the M2A Rig Monitor ........
  • Page 5 Adjusting Strobe/Horn Volume ......... 35 Replacing Components of the M2A Rig Monitor ......36 Chapter 7: RS-485 Modbus Output .

  • Page 6: Chapter 1: Introduction

    Chapter 1: Introduction Overview This chapter briefly describes the M2A Rig Monitor. This chapter also describes the M2A Rig Monitor Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2A Rig Monitor.

  • Page 7: Specifications

    ± 5% of reading or ± 2 ppm H S (whichever is greater) These are the RKI factory settings. You can change the alarm settings in Configuration Mode. See “Viewing & Changing M2A Rig Monitor Parameters” on page 27. WARNING:...

  • Page 8: Chapter 2: Description

    Chapter 2: Description Overview This chapter describes external and internal components of the M2A Rig Monitor. External Description This section describes the junction box and all external components of the M2A Rig Monitor. Strobe/Horn Mounting Slot (2X) Junction Box C over...
  • Page 9 S detector consists of a junction box with a mounting bracket, the detector, and the calibration cup/splash guard. Mounting Bracket Detector Cable (25 ft) Cable Bushing To M2A Rubber Spacers (3X) Terminal Strip H2S Detector (Factory Wired) Calibration Cup/ Splash Guard Figure 2: H S Junction Box Component Location M2A Rig Monitor Operator’s Manual...
  • Page 10 S detector is installed in the junction box’s bottom conduit hub and is factory wired to the M2A through the left cable bushing in the M2A junction box with a 25 foot cable for remote installation. The mounting bracket at the top of the junction box is used to mount the junction box.

  • Page 11: Internal Description

    Internal Description This section describes the internal components of the M2A Rig Monitor. The internal components of the Rig Monitor include the terminal PCB which provides for all the wiring connections to the Rig Monitor and the control PCB which displays the gas reading and has the control buttons.
  • Page 12 Leave this jumper installed unless directed to remove it for a Modbus installation. See “Chapter 7: RS-485 Modbus Output” on page 38 for a description of using the Rig Monitor in a Modbus system. M2A Rig Monitor Operator’s Manual...
  • Page 13 The push button switches are located along the bottom edge of the control PCB (see Figure 4). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right. Table 2: M2A Rig Monitor Control Button Functions Switch Function UP (YES) •...
  • Page 14 The alarm 2 LED is on when the Rig Monitor is experiencing an alarm 2 condition. • RX & TX LED’s These LED’s indicate data being received (RX) and transmitted (TX) when the Rig Monitor’s Modbus output is operating. M2A Rig Monitor Operator’s Manual...

  • Page 15: Chapter 3: Installation & Startup

    Chapter 3: Installation & Startup Overview This chapter describes procedures to mount the M2A Rig Monitor in the monitoring environment and wire it to input power and devices. Mounting the M2A Rig Monitor Perform the following procedure to install the instrument housing at the mounting site.
  • Page 16 Ensure that the detector is facing down. To Bottom To Left Cable Cable Bushing Bushing 1.50 Ø .75 Detector Cable 12 VDC Battery Cable 14.87 Max Figure 7: H S Junction Box Outline & Mounting Dimensions M2A Rig Monitor Operator’s Manual...

  • Page 17: Wiring The M2A Rig Monitor

    Wiring the M2A Rig Monitor WARNING: Always verify that the power source is OFF before making any wiring connections. The detector leads, power cable wiring, and strobe/horn wiring are all factory wired as shown in the figure below. White Term inal PCB...
  • Page 18 All of the conduit hubs are used in the Rig Monitor so you will need to uninstall the power cable from the bottom conduit hub and install a junction box that has multiple conduit hubs. Install appropriately rated cable bushings in the junction box. M2A Rig Monitor Operator’s Manual...
  • Page 19 Use an appropriately rated junction, conduit, conduit fittings, and appropriate construction technique to maintain the NEMA 4 environmental rating of the M2A junction box and avoid water entering the junction box at the conduit hubs. Guide the power wiring through the new junction box to the Rig Monitor and reconnect it.

  • Page 20: Start Up

    12. Secure the junction box cover to the junction box. Wiring into a Modbus Network If you wish to wire the Rig Monitor into a Modbus network, see “Wiring the M2A Rig Monitor in a Modbus System” on page 38.
  • Page 21 The M2A Rig Monitor is not an active gas monitoring device during the fresh air adjustment procedure. The 4-20 mA output signal will “freeze” at 3.5 mA and all relays will remain in their non-alarm state while the M2A Rig Monitor is in Calibration Mode. The output signal will not indicate current readings and the relays will not resume operating normally until the M2A Rig Monitor is in normal operation again.

  • Page 22: Chapter 4: Operation

    Chapter 4: Operation Overview This chapter describes the M2A Rig Monitor in normal operation. This chapter also describes the Rig Monitor in alarm 1, alarm 2, and fail conditions and suggests responses to these conditions. Normal Operation Normal operation is defined as follows: •...

  • Page 23: 4 - 20 Ma Signal Output Operation

    If you enter Calibration Mode, Configuration Mode, or Modbus Mode, the signal output will be fixed at 3.5 mA until the Rig Monitor returns to normal operation. If the M2A’s input power decreases below 9.5 volts so that the M2A is in a low power alarm, •...
  • Page 24 Condition Cause Visual Indication(s) If the M2A Rig Monitor is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and the display alternates between the gas reading and the ALMS 1&2 message. NOTE: You can select normally energized (N. EN) or normally de-energized (N. DE- EN) alarm 1 and alarm 2 relay settings in Configuration Mode.
  • Page 25 Resetting the alarm circuit turns off the A2 light, resets the OLED, and de-energizes the alarm 2 relay. NOTE: If the ENTER button is pressed while the M2A Rig Monitor is in an alarm 2 condition, the A2 LED will flash but all other indications will remain unchanged.
  • Page 26 When the input power increases above 10.0 volts, the Rig Monitor will begin its warm-up sequence. Verify that the Rig Monitor enters normal operation after its warm-up sequence. If necessary, perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 20. M2A Rig Monitor Operator’s Manual...

  • Page 27: Chapter 5: Configuration Mode

    If you are installing a new M2A Rig Monitor, it has been setup at the factory. Use Configuration Mode only if you want to change the M2A Rig Monitor’s setup.
  • Page 28 2 condition is initiated. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in 15 minute increments from 15 - 60 minutes. M2A Rig Monitor Operator’s Manual...
  • Page 29 Go back to step 3 and continue. If you wish to save the adjustments made, press and release the UP/YES button. Config Saved is indicated on the display for a few seconds and the M2A Rig Monitor returns to normal operation.

  • Page 30: Chapter 6: Maintenance

    M2A Rig Monitor, and replacing field replaceable parts. Preventive Maintenance This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2A Rig Monitor. It includes daily and quarterly procedures. Daily Verify a display reading of 0 ppm. Investigate significant changes in the reading.
  • Page 31 Table 5:Troubleshooting the M2A Rig Monitor Condition Symptom(s) Probable Causes Recommended Action Frequent or The Rig Monitor • The Rig Monitor is 1. Verify that the Rig Monitor wiring experiencing false is properly shielded. See “Wiring Suspect alerts you to frequent readings due to RFI the M2A Rig Monitor”...

  • Page 32: Calibration Frequency

    3 months may be necessary. Calibration This section describes how to calibrate the M2A Rig Monitor. It includes procedures to prepare for calibration, enter Calibration Mode, adjust the fresh air (zero) setting, adjust the span setting, and return to normal operation.
  • Page 33 While in the calibration program, if there is no switch activity for the calibration time-out period the unit will return to normal operation. See “Viewing & Changing M2A Rig Monitor Parameters” on page 27 for instructions to set the calibration time-out.
  • Page 34 If you want to exit Calibration Mode, press and release the DOWN/NO button. The M2A Rig Monitor will indicate Leaving CAL Mode and the M2A Rig Monitor will return to normal operation. Adjusting the Fresh Air Reading The display will indicate FreshAir Adjust? as described above in “Preparing for Calibration”.

  • Page 35: Adjusting Strobe/Horn Volume

    Loosen the captive screw at the bottom front of the strobe/horn. Grasp the top and bottom of the strobe/horn and push up and out in order to remove the cover. Base Captive Screw Push Out Push Up Here Figure 10: Top Case Removal M2A Rig Monitor Operator’s Manual...

  • Page 36: Replacing Components Of The M2A Rig Monitor

    Place the cover over the base and push in and down in order to reinstall the cover. Make sure that the cover is sealed to the base by the gasket. Screw the captive screw at the bottom front of the strobe/horn back in. Replacing Components of the M2A Rig Monitor Replacing the H S Plug-in Sensor Disconnect the battery clamps from the + and - terminals of the 12 VDC battery.
  • Page 37 10. Connect the battery clamps to the + and - terminals of the 12 VDC battery. CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the next step. 11. Calibrate the replacement detector as described in the Calibration section of this manual. M2A Rig Monitor Operator’s Manual...

  • Page 38: Chapter 7: Rs-485 Modbus Output

    The Modbus protocol supports a maximum of 247 unique slave addresses (1-247). The M2A Rig Monitor’s line driver provides for up to 128 M2A Rig Monitors to be connected together without the need for a repeater. Figure 13 & Figure 14 below illustrate typical Rig Monitor wiring configurations.
  • Page 39 Figure 12 also illustrates typical alarm device wiring. The ground jumper must be removed in this wiring configuration. Power Supply 10-30 VDC Remove Remove Ground Jumper Ground Detector Detector Additional Wiring Wiring Jumper M2As Common Input Terminals Modbus Controller Figure 12: Recommended Modbus Wiring M2A Rig Monitor Operator’s Manual...
  • Page 40 Not Installed Not Installed Not Installed ID = 1 ID = 127 ID = 126 ID = 125 Figure 13: Multiple M2A Rig Monitors in a Daisy Chain Configuration ID = 128 ID = 1 Termination Modbus Termination Jumper Master...

  • Page 41: Using The M2A Rig Monitor In A 4-Wire Modbus System

    NOTE: If the M2A Rig Monitor 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. While in normal operation, simultaneously press and hold the DOWN/NO and ENTER buttons for 5 seconds to enter Modbus Mode.
  • Page 42 NO button. The DO OVER? YES/NO message will display. Press and release the UP/ YES button. The Re-do MB Setup message will display and the M2A Rig Monitor will return to the first adjustable parameter. Go back to step 3 and continue.

  • Page 43: Supported Modbus Functions

    The Rig Monitor supports Function Code 03: Read Holding Registers and Function Code 16: Write Registers. The register assignments detailed below were implemented in Rig Monitor firmware version 5.0. Please see revision B of the M2A manual if you have an M2A Rig Monitor with a firmware version previous to 5.0.
  • Page 44 Rig Monitor’s OLED (not NULL Terminated). Register 12 Register 12 is the range (full scale readout). Register 13 Register 13 is the alarm 1 set point. The decimal point location is the same as specified in Register 1. M2A Rig Monitor Operator’s Manual...
  • Page 45 Register 29 is the alarm 2 normal relay state. 0=Normally De-Energized 1=Normally Energized Register 30 Register 30 is the alarm 2 relay reset. 0=Latching 1=Self-Resetting Register 31 Register 31 is the alarm 2 ON delay. Integer values are in seconds. M2A Rig Monitor Operator’s Manual...
  • Page 46 8=Calculated Zero Is Too High 9=Zero Failure 10=Span Failure 11=Calibration 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 M2A Rig Monitor Operator’s Manual...
  • Page 47 There are 21 registers in Function Code 16 that can be used to write to the Rig Monitor. This manual only describes Register 16 because it can be used to reset an alarm condition. For a complete description of Function Code 16, request Appendix B from RKI Instruments, Inc.

  • Page 48: Parts List

    Parts List Table 11 lists replacement parts and accessories for the M2A Rig Monitor Transmitter. Table 11: Parts List Part Number Description 06-1248RK Calibration kit sample tubing (3/16 in. x 5/16 in.; specify length when ordering) 07-0033RK Cap gasket, for CSA type CO and H...

  • Page 49: Appendix A: Control Button Quick Reference Guide

    Appendix A: Control Button Quick Reference Guide The M2A Rig Monitor’s control buttons allow access to operational modes, resetting of alarms, and display of the Information Screen. Table 12 shows which button combinations perform these functions and which parameters are available for adjustment while in the operational modes.

  • Page 50: Appendix B: Function Code 16 Registers

    Appendix B: Function Code 16 Registers The M2A Rig Monitor supports Function Code 16 that allows writing to the Rig Monitor. There are 21 registers in this Function Code. The register assignments detailed below were implemented in M2A Rig Monitor firmware version 5.0. Please see revision B of the M2A manual if you have an M2A Rig Monitor with a firmware version previous to 5.0.
  • Page 51 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 Rig Monitor manual. Register 17 Register 17 is the calibration month (MSB) and day (LSB).
  • Page 52 Register 19 Register 19 is for clearing change flags. When parameters are changed at the M2A Rig Monitor, a flag is raised at the controller. This register can be used to clear those flags. Table 13: Register 19, Clear Change Flags Bit(s) Value &...

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