Michell Instruments S904, Руководство пользователя

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S904 & S904D User’s Manual
Michell Instruments 11
INSTALLATION
2.4 Desiccant
The S904 Series has a container fi lled with a desiccant which is used to dry the air.
Figure 11 Desiccant Replacement
The desiccant container can be accessed by following these steps:
1. Remove the clear plastic screw cap on the front panel.
2. Pull out the desiccant container using the fi nger tips.
3. Fill with desiccant up to the thread as shown in
Figure 12 below.
Figure 12 Level of Silica Gel Required
The natural color of the desiccant (dry silica gel) should be orange, or blue (depending
on type). As moisture is absorbed, the color will gradually change to transparent or
pink (depending on type). When the desiccant has become transparent or pink - this
is an indication that the instrument’s ability to generate low humidity is reduced. It is
recommended that the silica gel is replaced or regenerated at this time.
The desiccant can be regenerated by emptying it completely from the desiccant chamber
and drying it in an oven for approximately 3 hours at a temperature of +130°C (266°F).
After drying it in an oven, allow the desiccant to cool before re fi lling the desiccant
chamber and re fi tting the chamber into the generator. Ensure that the screw lid is
correctly fi tted.
Frequency of desiccant regeneration or replacement is dependant entirely upon the
length of time in operation. Typically, given a normal calibration pro fi le and operation
cycle, the S904 Series can continually generate accurate and stable chamber humidity
for a period of several weeks before regeneration or replacement of the desiccant is
necessary.