User Manual

2 • 65-2405RKSS Combustible Gas Transmitter

Description

This section describes the components of the combustible gas transmitter. The transmitter

is a 4 - 20 mA type detector head. It consists of the combustible gas detector, amplifier, and

junction box.

Figure 1: Combustible Gas Transmitter Component Location

Combustible Gas Detector

The combustible gas detector is a catalytic type detector that produces an electrical output

that corresponds to the detection range. It is packaged in a 1/2 inch NPT nipple with a

sintered metal flame arrestor on one end allowing ambient air to diffuse into the detector.

The flame arrestor also contains any sparks which may occur within the detector. The 1/2

inch NPT mounting threads at the top of the detector allow you to mount it into the

bottom conduit hub of the junction box. A 3/4 in. x 1/2 in. NPT reducer is necessary to

install the combustible gas detector in the junction box. A rainshield screws onto the

bottom of the detector (flame arrestor end). The rainshield helps protect the detector from

rain and debris in the monitoring environment. Four color-coded leads extend from the

top of the detector. The leads allow you to connect the detector to the amplifier.

PWR / SIG

LEL

WRB

Mounting Screw

Amplifier

Zero Pot

LEL Detector

Detector Terminal Strip

J-Box

Detector (sensor) Current

Label

Controller Terminal Strip

Factory Adjust Pot

Jumper Pins,

Factory Use Only

ZERO

SPAN

Red + Test Point

Black - Test Point

Reducing Bushing,

3/4NPTto1/2NPT

Factory Adjust Pot

Span Pot

Sensor

Current

148mA