Campbell HMP 35A Manuale delle Istruzioni Scaricare il pdf (Pagina 23)

HMP155A Temperature and Relative Humidity Probe

Because of the inverse relationship between relative humidity and air

temperature, finding the mean relative humidity is meaningless. A more useful

quantity is the mean vapor pressure. The mean vapor pressure can be

computed online by the datalogger (see Appendix B.3, Mean Vapor Pressure

Examples).

8. Sensor Maintenance

The HMP155A probe requires minimal maintenance. Check monthly to make

sure the radiation shield is free from debris. The filter at the end of the sensor

should also be checked for contaminates.

8.1 Periodic Maintenance

8.1.1 Cleaning

Clean the probe with a soft, lint-free cloth moistened with mild detergent.

8.1.2 Changing the Probe Filter

1. Remove the filter from the probe.

2. After removing the filter, check the O-ring and change it if necessary.

3. Install a new filter on the probe.

New filters can be ordered from Campbell Scientific or Vaisala.

FIGURE 8-1. Changing the filter

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Campbell HMP 35A Manuale delle Istruzioni Pagina 23