Alpha Moisture Systems dewSMART DT20 Instruction Manual - Page 9

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1. General Specification

Page 9

INSTALLING AND COMMISSIONING SENSOR

It is advisable to carry out an initial purge routine of the sample loop, before installing the

sensor, in order to remove the possibility of sensor damage on start-up.

Refer to the sample system schematic on page 6 of this manual and open the inlet

isolation valve slowly, until a small flow of air/gas at atmospheric pressure flows through

the inlet pipework to the sensor holder and exhausts through the sensor entry pOli of the

sensor holder.

Allow this purge to continue for about 15 to 20 minutes to remove any residual moisture

from the sample pipework and components.

Close the inlet isolation valve, install the sensor into the sensor holder and ensure that the

sensor cable connector is correctly positioned, that the sealing cup is in place and the

retaining screw is screwed down securely to effect a weatherproof seal.

Open the inlet valve slowly again and, by opening all valves after the sensor holder,

allow a low pressure purge through the whole sample system. (Note. If a closed by-pass

loop is installed, this section of the procedure is not possible).

Set the required pressures and flows within the sample loop.

This completes the installation and commissioning but, on initial start-up, it could take

several hours for the system to reach equilibrium, depending on the number and type of

components used in the sample loop.

The instrument will now indicate the dewpoint of air/gas surrounding the sensor, at

sensor pressure and the analogue output will be giving a mA signal proportional to the

indicated dewpoint.

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