Vaisala DMT340 User Manual download pdf (Page 151)

Chapter 6 _______________________________________________________________ Maintenance

VAISALA _______________________________________________________________________ 149

CHAPTER 6

MAINTENANCE

Periodic Maintenance

Cleaning

Clean the transmitter enclosure with a soft, lint-free cloth moistened with

mild detergent.

Changing the Probe Filter

NOTE

Some probe and filter combinations are equipped with a

washer under the

filter. The purpose of the washer is to prevent vibration from loosening

the filter. If the washer is present, leave it in place

when changing the

filter.

1. Turn the filter counter-clockwise to loosen it.

2. Remove the filter from the probe. Be careful not to touch the sensor

with the filter. Without the filter in place, the sensor is easily

damaged – handle the probe carefully.

3. Install a new filter on the probe. When using the stainless steel

filter, take care to tighten the filter properly (recommended

force 5 Nm).

New filters can be ordered from Vaisala, see Available Options and

Accessories Table 35 on page 170.

Calibration and Adjustment

The DMT340 is fully calibrated and adjusted as shipped from factory.

Typical calibration interval is two years. Depending on the application it

may be good to make more frequent checks. Calibration must be done

always when there is a reason to believe that the device is not within the

accuracy specifications.

It is recommended that calibration and adjustment should be carried out

in a Vaisala Service Center. For contact information of Vaisala Service

Centers, see www.vaisala.com/servicecenters.

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Vaisala DMT340 User Manual Page 151