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HT/O Installation Instructions TG200992 Issue 1/A 30/01/08

Installation Instructions HT/O

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4 Maintenance

Over time, the sensing element may become covered in dust. The dust can be removed using compressed air. Under no

circumstances should water or cleansing agents be used on the sensing elements.

It is recommended that the accuracy of the sensor is verified every 12 months. If the sensor falls outside the quoted accuracy,

replace the filter and recalibrate as shown below:

Replace filter

Preparation

• Keep sensor and humidity chamber in same room for

4 hours before.

• Place probe in humidity chamber 30 mins before.

• Keep temperature constant during calibration.

a unscrew

c ACC/HTO/FILTER

Caution: Do not touch humidity sensing element

Remove Cover

Detach Sensor

Caution: This unit contains static sensitive devices.

Suitable anti-static precautions should be taken

throughtout the operation to prevent damage to

the units.

BS EN100015/1 Basic Specification: protection of

electrostatic sensitive devices.

Remove from Radiation Shield

Locate buttons

push

buttons

calibration

LED

See Section 5, Disposal

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