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

Page 7

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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