Campbell Scientific 0871LH1 Freezing Rain Sensor - 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