PCME QAL 181 X, User Manual, Page: 25 / 106

- PCME QAL 181 MANUAL: 25 -
3.9 Mounting the blower unit (Option)
This section describes the installation of the optional PCME Small Blower Unit for use with the
PCME QAL 181 sensor. This may be used as an alternative to the use of instrument air. The
blower is designed to supplying sufficient purge air (50 Litres/min) under normal stack conditions.
HAZARDOUS VOLTAGES
THIS EQUIPMENT CONTAINS LETHAL VOLTAGES (100-240VAC 50/60HZ).
Disconnect mains supply before opening enclosure.
Positive stack pressure will reduce the air purge capability.
With zero stack pressure, blower delivers 50 Litres/minute
Above 15mbar positive stack pressure it is recommended to use an instrument air
line.
The blower is supplied pre-fitted with 2m tubing, ended with a short piece of narrow
tubing to connect to the sensor. Do not add any additional restrictions to the tubing.
This will reduce the air supply to the sensor.
Ensure the lid is tightened fully (using ¼-turn screws). This ensures the filter can
operate fully to keep the air clean.
The filter is a replaceable part. To remove the filter slacken the filter bracket (shown
below).