Alpha Moisture Systems dewSMART DT20 Руководство по эксплуатации - Страница 9

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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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DOC: DSI000IDT20.9-1-1