RKI Instruments M2 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
M2 Transmitter
Operator’s Manual
Part Number: 71-0107RK
Revision: D
Released: 10/7/10

M2 Transmitter Operator’s Manual
WARNING
Read and understand this instruction manual before
operating instrument. Improper use of the gas monitor
could result in bodily harm or death.
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 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.

M2 Transmitter Operator’s Manual
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. This warranty does not apply to those items
which by their nature are subject to deterioration or consumption in normal service, and
which must be cleaned, repaired, or replaced on a routine basis. Examples of such items
are:
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty 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
approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,
AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF
RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF
ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR
OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors,
dealers, and representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses

M2 Transmitter Operator’s Manual
Table of Contents
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
About this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
External Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 3: Installation & Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mounting the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Information Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4 - 20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Viewing & Changing M2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

M2 Transmitter Operator’s Manual
Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Calibration, Combustible Gas, CO2, and Toxic Versions . . . . . . . . . . . . . . . . . . . . . 40
Calibration, Oxygen Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Replacing Components of the M2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Wiring the M2 in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Using the M2 in a 4-wire Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Appendix B: Function Code 16 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
(Appendix B available from RKI Instruments, Inc. Not included in manual as normally
provided with M2 detector head.)

1 M2 Transmitter Operator’s Manual
Chapter 1: Introduction
Overview
This chapter briefly describes the M2 Transmitter. This chapter also describes the M2
Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the
specifications for the M2.
About the M2 Transmitter
The M2 transmitter is a fixed mount, continuous-monitoring detector head. All user
adjustable parameters may be accessed using push button switches. In addition,
calibration may be performed non-intrusively by use of a magnetic wand accessory which
activates magnetic switches through a window at the front face of the detector head.
The M2 displays the current gas reading on an LCD display 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
programmable controller. The M2 also provides an RS-485 Modbus output. Three sets of
relay contacts, two controlled by the gas alarms and one by the fail alarm, rated at 115
VAC 5 amps are available for controlling devices such as lights or horns or for controlling
higher rated relays.
Four operating modes allow you to display and change setup and calibration settings and
change the gas type. They are Calibration Mode, Configuration Mode, Gas Type Mode,
and Modbus Mode.
About this Manual
The M2 Transmitter Operator’s Manual uses the following conventions for notes, cautions,
and warnings.
NOTE: Describes additional or critical information.
CAUTION: Describes potential damage to equipment.
WARNING: Describes potential danger that can result in injury or death.

M2 Transmitter Operator’s Manual 2
Specifications
Table 1 lists specifications for the M2.
Table 1: M2 Specifications
Target Gas/Detection
Range Combustible Gas/Carbon Dioxide (CO2)
• Catalytic LEL: 0 - 100% LEL, 1% LEL increments (CH4calibration
unless otherwise specified. H2specific detector available)
•IR(infrared)CH
4LEL: 0 - 100% LEL, 1% LEL increments
• IR HC LEL: 0 - 100% LEL, 1% LEL increments (propane calibration)
•IRCH
4Volume: 0 - 100 % volume, 1% increments
•IRCO
2ppm: 0 - 5,000 ppm, 20 ppm increments
•IRCO
2Volume: 0 - 5.00 % volume, 0.01% increments
•IRCO
2Volume: 0 - 50.0 % volume, 0.1% increments
•IRCO
2Volume: 0 - 100 % volume, 1% increments
Oxygen
•Oxygen(O
2): 0 - 25.0 % volume, 0.1% increments
CO/H2S
• Carbon Monoxide (CO): 0 - 300 ppm, 1 ppm increments
• Hydrogen Sulfide (H2S): 0 - 100 ppm, 1 ppm increments
ESM-01 Toxic
•Ammonia(NH
3): 0 - 75.0 ppm, 0.1 ppm increments
•Arsine(AsH
3): 0 - 1.50 ppm, 0.01 ppm increments
•Chlorine(Cl
2): 0 - 3.00 ppm, 0.01 ppm increments
• Hydrogen Cyanide (HCN): 0 - 15.0 ppm, 0.1 ppm increments
• Phosphine (PH3): 0 - 1.00 ppm, 0.01 ppm increments
• Sulphur Dioxide (SO2): 0 - 6.00 ppm, 0.01 ppm increments
Alarm Settings
(Alarm 1/Alarm 2) Combustible Gas (%LEL): 10 %LEL/50 %LEL Combustible Gas (%Volume): 100 %/100 %
CO2 0 - 5,000 ppm: 2,500 ppm/5,000 ppm
CO2 0 - 5.00%: 0.50 %/3.00 %
CO2 0 - 50.0%: 50.0%/50.0%
CO2 0 - 100%: 100%/100%
Oxygen: 19.5%(decreasing)/23.5%(increasing)
Carbon Monoxide: 25 ppm/50 ppm
Hydrogen Sulfide: 10 ppm/50 ppm
Ammonia: 12 ppm/25 ppm
Arsine: 0.20 ppm/0.50ppm
Chlorine: 0.50 ppm/1.50 ppm
Hydrogen Cyanide: 5.0 ppm/10.0 ppm
Phosphine: 0.10 ppm/0.30 ppm
Sulphur Dioxide: 1.00 ppm/2.00 ppm
Construction
(housing) Explosion-proof Junction Box, NEMA 4
Area Classification Explosion-proof for Class I, Groups B, C, and D (Combustible, CO2, CSA
Type CO and H2S, and CSA Type oxygen)

3 M2 Transmitter Operator’s Manual
WARNING: When using the M2, you must follow the instructions and warnings in
this manual to assure proper and safe operation of the M2 and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the M2 as described in this manual.
Sampling Method Diffusion
Input Power 19 - 30 VDC
Controls • Three push button switches
• Three magnetic switches for non-intrusive calibration
Weight 4.5 lbs.
Signal Output • 4 to 20 mA, 500 ohms impedance max
• RS-485 Modbus
Operating
Temperature • ESM-01 Type: -10°C to 40 °C
• All Others: -20°C to 50°C
Accuracy ± 5% of full scale
*These are the RKI factory settings. You can change the alarm settings in Configuration Mode. See
“Viewing & Changing M2 Parameters” on page 30.
Table 1: M2 Specifications

M2 Transmitter Operator’s Manual 4
Chapter 2: Description
Overview
This chapter describes external and internal components of the M2 Transmitter.
External Description
This section describes the junction box and all external components of the M2 transmitter.
Figure 1: M2 External Components
Junction Box
The M2’s cast aluminum junction box is dust and weather resistant. The junction box also
protects the M2 and all connections made to it. Use the two 3/4 in. conduit hubs to mount
the detector to the junction box (factory installed in the bottom hub) and connect wiring
from an external device (top hub).
Use the junction box’s two mounting holes to mount the M2 to a vertical surface at the
monitoring site. The window in the cover on the front of the junction box allows you to
view the LCD display and use the magnetic wand to actuate the magnetic control
switches so you can perform non-intrusive calibration. Removing the cover allows you to
access the interior of the junction box.
3/4 NPT
Conduit Hub
Junction Box
Cover
Window
Detector
(Catalytic LEL Detector Shown)
Mounting Hole (2) Magnetic
Wand

5 M2 Transmitter Operator’s Manual
Magnetic Wand
The magnetic wand is a short plastic rod with a magnet in one end. It is used to actuate
the magnetic control switches on the control PCB while the junction box cover is still
installed so that non-intrusive calibration can be performed.
Gas Detector
The gas detector senses the target gas and is mounted in a 3/4” conduit hub on the right
bottom side of the M2. A variety of detectors may be used with the M2. Table 2 below lists
the detectors that can be used with the M2.
Table 2: M2 Detectors
Target Gas, Range Detector(s) Used
Combustible Gas, 0 - 100% LEL • 61-0140RK (Catalytic UL version)
• 61-0140RK-05 (Catalytic CSA version)
Hydrogen, 0 - 100% LEL • NC-6205-01 (Catalytic UL version, hydrogen specific)
• NC-6205-05 (Catalytic CSA version, hydrogen specific)
CH4, 0 - 100% LEL • 61-0190RK-CH4 (IR UL)
HC, 0 - 100% LEL (cal. to propane) • 61-0190RK-HC (IR UL)
CH4, 0 - 100% volume • 61-0192RK-CH4 (IR UL)
CO2, 0 - 5,000 ppm • 61-0191RK-02 (IR UL)
• 61-0198RK-02 (IR)
CO2, 0 - 5% • 61-0191RK-03 (IR UL)
• 61-0198RK-03 (IR)
CO2, 0 - 50% • 61-0191RK-05 (IR UL)
• 61-0198RK-05 (IR)
CO2, 0 - 100% • 61-0191RK-10 (IR UL)
• 61-0198RK-10 (IR)
Oxygen, 0 - 25% • 65-2494RK (capillary)
• 65-2510RK (partial pressure)
• 65-2511RK (capillary)
• 65-2514RK (capillary, CSA)
CO, 0 - 300 ppm • 65-2433RK-05 (CSA)
• 65-2496RK
H2S, 0 - 100 ppm • 65-2423RK-05 (CSA)
• 65-2495RK
NH3, 0 - 75 ppm • 65-2300RK-NH3
AsH3, 0 - 1.5 ppm • 65-2300RK-ASH3
CL2, 0 - 3 ppm • 65-2300RK-CL2
PH3, 0 - 1 ppm • 65-2300RK-PH3
SO2, 0 - 6 ppm • 65-2300RK-SO2