Chapter 6 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 55
0711-195
Figure 22 Filter Structure
Stainless steel mesh filter (do not touch)
Replace the filter as follows:
1. Grip the old filter from the top of the filter body using an 11 mm
socket wrench. Turn the filter counterclockwise until it is loose.
2. Pull the filter straight out carefully; do not damage the sensor, and
do not lose the spring washer.
3. Take the new filter, and insert it to the filter threads. The spring
washer should be under the filter.
4. Tighten the new filter by turning it clockwise with the 11 mm
socket wrench. Tighten to 5 N m.
Calibration and Adjustment
The DMT152 is fully calibrated as shipped from factory. The
recommended calibration interval is 2 years. If the transmitter is used in
the wet end of the measurement range, calibration should be done every
year. Calibration should also be done if there is a reason to believe that
the device is not within the accuracy specifications.
You can perform a simple field checking operation by comparing the
readings of the DMT152 and the DM70 hand-held dewpoint meter with a
calibrated reference probe. For more information, see section Field
Check Using DM70 on page 56.
If there is need for calibration or adjustment, contact a Vaisala Service
Center or your local Vaisala representative. See section Technical
Support on page 61.
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