Greystone CMD5B1 Series Installation Manual

Carbon Monoxide Transmitter

Operation

In normal operation the sensor will measure the CO level in the surrounding air and output a proportional value on the 4-20
mA output. The CO measurement range is 0 to 300 ppm. An optional relay can be used to indicate an alarm condition. The
trip point for the relay can be programmed to three different settings with an on-board jumper. If the CO level exceeds the
trip point then the relay is activated. The relay will remain activated until the CO level drops below the (trip level –
hysteresis) where hysteresis is 3% or 9 ppm.

Start-up

Verify that the Carbon Monoxide Transmitter is properly wired according to the wiring diagrams and all connections are
tight. Apply power to the device and the sensor will begin reading the CO level and output the analog signal.
Mounting
The CO enclosure should be mounted on a flat surface three to five feet from the floor of the area to be controlled. Do not
mount the sensor near doors, opening windows, supply air diffusers or other known air disturbances. Avoid areas with
vibrations or rapid temperature changes.
IN-CMD5B1-01-01

Introduction

The CO Transmitter uses an electrochemical sensor to monitor the CO
level and outputs a 4-20 mA signal. The standard product features a 2-
wire loop-powered output. Optionally, the device may be configured with
an alarm relay and operates in 3-wire sourcing mode.

Before Installation

Read these instructions carefully before installing and commissioning the
CO transmitter. Failure to follow these instructions may result in product
damage. Do not use in an explosive or hazardous environment, with
combustible or flammable gases, as a safety or emergency stop device or
in any other application where failure of the product could result in
personal injury. Take electrostatic discharge precautions during
installation and do not exceed the device ratings.
May 2, 2017
Installation Manual
Page 1