ACG+
Service & Troubleshooting Manual
Int. Approved
Document ref: P0149-825-00
October 2022
Page 26 of 37
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Commercial in Confidence
4]
Ensure that the dowty washer is fitted to the new sensor as shown and insert the new
sensor into the sensor housing, taking care not to damage the sensor head. Screw the
sensor into its mount and fully tighten using a 30mm spanner
5]
Re-connect the cable to the new sensor, into the port labelled 'II', checking for correct
orientation. Push the connector in full to ensure it is secure.
4.2
Filter replacement
The ACG+ has two types of user changeable filters. These are the internal activated charcoal filter and an internal
hydrophobic particulate filter.
4.2.1
Activated charcoal filter replacement
The activated charcoal filter is fitted to absorb any VOCs present in the gas sample before the carbon monoxide
content in the gas is measured by the carbon monoxide sensor. The carbon monoxide sensor is cross-sensitive to
VOCs so this must be filtered out before gas sample is passed over the carbon monoxide sensor to ensure
accurate measurement is made.
The procedure for changing the activated charcoal filter is as follows.
1]
Disconnect both 6mm elbow push fittings from filter.
2]
Remove filter from clip and remove the elbows from the filter.
3]
Reverse the above process to fit a new filter.
