Campbell Scientific 0871LH1 Freezing Rain Sensor - Manual (Page 6)

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rain sensor remains in an icing environment. The ice signal activates at
0.5mm ice accretion and stays on for 60 seconds after the end of the icing
encounter. Specifically, when the output is activated, a 60-second timer is
started. Each time 0.5mm forms on the probe, the 60-second counter is
reset. In effect, the output stays on for 60 seconds after the beginning of
the “last” icing encounter.
The Status output indicates whether the freezing rain sensor is
functioning correctly using tests that are described in more detail in
following sections of this document.
Strut Heaters
Probe Heater
Termination
Drive Coil
Feedback Coil
Ultrasonic Vibrating Probe
40KHz Nominal
Magnet
Strut Heaters
Probe Heater
Termination
Drive Coil
Feedback Coil
Ultrasonic Vibrating Probe
40KHz Nominal
Magnet
Figure 1 MSO Circuit Sectional View
Figure 2 MSO Circuit Schematic