RKI Instruments M2 Series - Manual (Page 8)

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.
WARNING: M2 detector heads with firmware version 5.0 or later have a different
Modbus register assignment than M2s with previous versions of
firmware. If you are adding M2s with firmware version 5.0 or later to an
existing Modbus network installation, confirm what firmware version is
installed in the M2s already in the network and if necessary, take all steps
required to address the differences in Modbus register assignments. See
“Supported Modbus Functions” on page 55 for information on the current
Modbus register assignments. The firmware version is shown on the
Information Screen described on page 25.
Area Classification Explosion-proof for Class I, Groups B, C, and D (Combustible, CO
2
, CSA
Type CO and H
2
S, and CSA Type oxygen)
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 Catalytic Combustible Gas:
± 5% of reading or ± 2% LEL (whichever is greater)
IR Combustible Gas/IR CO
2
:
± 5% of reading or ± 2% of full scale (whichever is greater)
Oxygen:
± 0.5% O
2
Hydrogen Sulfide:
± 5% of reading or ± 2 ppm H
2
S (whichever is greater)
Carbon Monoxide:
± 5% of reading or ± 5 ppm CO (whichever is greater)
ESM-01 Toxic Sensors:
± 10% of reading or ± 5% of full scale (whichever is greater)
*
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