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Millwatch/Silowatch
Single Stream
User Guide
1 General Description
This User Guide gives instructions on how to install, operate and maintain the
following instruments:
•
Millwatch / Silowatch (CO single stream, including High-CO)
•
Silowatch (CO + O
2
single stream)
Each instrument is an extractive gas analyser designed to monitor carbon
monoxide (CO) levels in coal pulverizing mills, hoppers and storage silos. The
Silowatch also monitors Oxygen (O
2
) levels.
Carbon monoxide is produced by incomplete or spontaneous combustion and its
presence can give advanced warning of a fire.
There are two types of sample probe available, one sample probe has a hardened
protective cover designed for highly abrasive pulverised coal.
A continuous sample of gas is drawn into the analyser via sample probes and
lines.
The sample gas is conditioned within the analyser and then analysed by dual
sensors which operate alternately to improve sensor life and accuracy, whilst also
providing a vital self checking function.
To prevent blockages the probe is automatically purged with compressed air at
preset intervals.
WARNING
The Millwatch and Silowatch are
not
designed for use in hazardous
areas.
The Millwatch and Silowatch are intended as an early warning
device. It is not a substitute for a certified fire detection system.
