Envent Engineering Ltd. Page 20 Revision 2.4
humidification of the sample before it gets into contact with the H
2
S sensing tape;
refer to Figure 7 .
Figure 7. Envent's Humidifier Unit for 330S & 331S
The humidifier works by using Nafion Tubing. This material has the capability to
transports water vapor from the most humidified medium to the driest medium. The
sample gas traveling inside the Nafion tube is dryer than the outside of the tube which
is being saturated with water, thus, humidifying the gas sample. It is important to have
a constant flow to create a constant humidification of the sample gas.
The humidifier unit can be filled with distilled water or 5% Acetic Acid up to where the
line indicates on the unit. Acetic acid is preferable over distilled water since it prevents
the liquid to create mold and fungus overtime. Also the freezing point for water is 0 °C
and for 5% Acetic Acid is -2 °C making it more reliable under freezing temperatures.
For the SDS models, the humidifier has two inlet and outlet ports. It is important to
make sure that the tubing is not connected to the wrong port. The Vinyl tubing that
connect to the humidifier are label with a 1 and a 2, make sure they are matched
when installing them to the humidifier.
The analyzer should not be exposed to ambient temperatures lower than 0 °C.
By default, all 330S/331S H
2
S analyzers have a temperature alarm set to 0 °C
descending.
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