Temperature And Relative Humidity Probe; Battery Voltage - Campbell 012 Operator's Manual

SECTION 4. MAINTENANCE
4.5 TEMPERATURE AND RELATIVE
HUMIDITY PROBE
The HMP35C Probe requires minimal
maintenance. Monthly, check to make sure the
radiation shield is free from debris. The screen
on the sensor should also be checked as often.
Annually, check the calibration of the probe. (It
should be sent to CSI if recalibration is needed
and facilities to do so are unavailable.)
4-2

4.6 BATTERY VOLTAGE

The battery voltage is recorded daily. The
battery should be recharged when the voltage
is below 11 volts. Incorrect battery voltage
readings occur when the battery is low.
Weather stations charging with AC power
should check the charging source, transformer,
or regulating circuit if the voltage readings are
12 volts or less. A normal charging voltage is
around 13.5 volts.