Vaisala HUMICAP HMP46 User's Guide download pdf (Page 41)

HMI41 AND PROBES

M210316EN-A Operating Manual

9. MAINTENANCE

9.1 Changing the HUMICAP



180 humidity sensor

Unscrew the plastic grid (HMP41&45) or the sintered filter (HMP46).

Remove the damaged sensor and mount a new HUMICAP

180 humidity

sensor in its place. Handle the sensor with care. Calibrate the probe using a

two-point calibration procedure (see section 5.2.4).

9.2 Chemical tolerances of the HUMICAP



180 sensor

Long-term exposure of the HUMICAP



sensor to certain chemicals and gases

may affect the characteristics of the sensor and shorten its life. The following

table gives the recommended maximum ambient concentrations of some

chemicals:

ppm (typ.)

Organic solvents 1000...10 000

Aggressive chemicals (e.g. strong acids

such as SO

, H

S, HCl, Cl

, etc.)

1...10

Weak acids 100...1000

Bases 10 000...100 000

If necessary, request detailed information on allowed concentrations from

Vaisala representatives.

9.3 Using the HMP46 in high temperatures

The HMP46 probe can be temporarily used in high temperatures. For example,

the probe can be installed in +180 °C for 30 minutes provided that the probe

handle and 10 cm of the metal tube are at room temperature. When the

HMP46 probe is used in high temperatures, it warms up. Take necessary

precautions before touching it!

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Vaisala HUMICAP HMP46 User's Guide Page 41