Owner's manual
65-2405RK-03 Combustible Gas Transmitter • 1
Overview
This manual describes the 65-2405RK-03 combustible gas transmitter. This manual also 
describes how to install, start up, configure, maintain, and calibrate the transmitter when 
it is used with a gas monitoring controller. A parts list at the end of this manual lists 
replacement parts and accessories for the combustible gas transmitter.
Specifications
Table 1 lists specifications for the combustible gas transmitter.
WARNING: When using the 65-2405RK-03, you must follow the instructions and 
warnings in this manual to assure proper and safe operation of the 
65-2405RK-03 and to minimize the risk of personal injury. Be sure to 
maintain and periodically calibrate the 65-2405RK-03 as described in this 
manual.
Table 1:Specifications
Description Specification
Target Gas Combustible gas (methane calibration standard)
Area Classification Explosionproof for Class I, Groups B, C, and D
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 100% LEL
Response Time 90% in 45 seconds
Operating Temperature -4°F to 122°F (-20°C to 50°C)
Accuracy ± 5% of reading or ± 2% LEL (whichever is greater)










