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Campbell Scientific 0871LH1 Freezing Rain Sensor User 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