4 specifications – Campbell Scientific 0871LH1 Freezing Rain Sensor User Manual
Page 7

4
4 Specifications
Power Supply
Operating Voltage:
18 – 29.5 VDC
Power
Draw:
5W
max
at 24 VDC (sensing mode)
27W max at 24 VDC (deicing mode)
Temperature
Operating: -55
°C to +71°C
Storage: -65
°C to +90°C
Communication Outputs
Discrete Outputs:
for Icing and Status
No Icing – Open, Icing – Ground
Status OK – Ground, Status Failure – Open
RS-422: Hexidecimal
24-byte
string
(ASCII
format)
9600 Baud (1 Start Bit, 8 Data Bits, No Parity, 1
Stop Bit)
RS422 Outputs:
for Icing and Status
No Icing – 0, Icing – 1
Status OK – 0, Status Failure – 1
Icing Signal Period:
60 second activation from start of icing
measurement (Discrete or RS-422 outputs)
Connector Pinout
Table 1. 0871LH1 Connector Pinout
Connector Pin
Signal Description
A 24VDC
B 24VDC
Return
C Case
Ground
D RS-422
High
E RS-422
Low
F Ice
G Status
Mating Connector: MS27473T10B99SN
De-icing Control
Automatically triggered with accumulation of
0.5mm of ice on probe
Max heating time – 25 seconds
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