AquaXact Issue 1.0
© Servomex Group Limited 2017
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any circumstances, as measurements would be incorrect and/or response time slow
due to water retention inside these materials.
Try to run pipes to the sensor upwards, so that contaminants tend to fall back into the
main line.
Keep the length of the sample line to the sensor as short as possible.
Use small diameter pipes (1/4” or 1/8” OD).
Use sufficient flow rates (e.g. 2-15 liter/min with 6 feet of 1/8” piping is recommended).
The flow rate will influence the systems response time.
Do not install any devices upstream of the sensor, such as other measuring systems,
flow meters etc., which are not absolutely necessary as these are potential leak
sources.
Install a coalescing and / or particulate filter ahead of the sensor to prevent any liquid or
particulate contamination of the sensor.
If filters are used upstream of the sensor, make sure these only contain non-
hygroscopic filter materials.
If pressure regulators, shut-off valves etc. are used upstream of the sensor, make sure
they do not contain rubber or other hygroscopic materials.
Mechanical installation
4.2
Various adapters are available for direct connection into existing dew point transmitter
openings. Ask your representative for a sample block cell, if you do not have the ability to
provide an appropriate sample cavity mounting. If the 14 mm x 1.25 mm thread is used
then the AquaXact will seal against the wall of the sample cell with the provided Viton A
O-ring. The AquaXact is light enough such that the standard thread will mechanically
support the whole transmitter. To prevent any leaks, tighten the transmitter into the sample
cavity, with a 1½ “wrench, 1/8 turn past finger-tight to assure metal-to-metal contact, do
not exceed 15 foot-pounds.
The sensor tip can be removed from the transmitter by unscrewing it (Figure 4-3). Make
sure that the sensor is securely fastened to the transmitter (the tension washer should be
compressed), so that it does not come loose during use, do not over-tighten because the
sintered material will break.
