INST

RU

CT

ION

MA

NU

AL

Copyright © 20Campbell Scientific (Canada)Corp.

0871LH1Freezing Rain Sensor

201

1

1 ............................................................................................................................................... 2 2 ................................................................................................................................................ 2 3 ............................................................................................................. 2 4 ....................................................................................................................................... 4 5 .............................................................................................................................. 6 6 ................................................................................................................. 7 7 .............................................................................................................................. 7 8 ..................................................................................................................... 7 9 .................................................................................................................................................. 8

9.1 0871LH1CBL-L Wiring for Discrete Output ................................................................................ 8 9.2 0871LH1CBL-L Wiring for RS422 Output .................................................................................. 9

10 .............................................................................................................................. 10 10.1 CR1000 Example – Discrete Outputs ...................................................................................... 10 10.2 CR23X Example – Discrete Outputs ........................................................................................ 11 10.3 CR1000 Example – RS422 Outputs ........................................................................................ 13

1 ....................................................... 20 2 ................................................................................................................................. 20 3 ................................................................................................................. 20 4 .............................................................................................................. 20 5 ..................................................................................................... 21 6 ...................................................................................................................... 22 7 ................................................................................................................... 22 8 .......................................................................................................................... 23 9 ....................................................................................................... 24 10 ......................................................................................... 25

1 .................................................................................................... 26 1.1 Microcontroller .......................................................................................................................... 27 1.2 Watchdog/Reset Circuit ............................................................................................................ 27 1.3 Serial EEPROM ........................................................................................................................ 27 1.4 Probe Oscillator ........................................................................................................................ 27 1.5 Heater Control .......................................................................................................................... 27 1.6 Drive Coil .................................................................................................................................. 28 1.7 Feedback Coil .......................................................................................................................... 28 1.8 Heater ....................................................................................................................................... 28 1.9 DC Power Supply ..................................................................................................................... 28 1.10 Status Output ........................................................................................................................... 28 1.11 Ice Signal Output ...................................................................................................................... 28

2 .................................................................................................................... 29 3 ................................................................................................................. 30

3.1 Input/Output Pin Designations.................................................................................................. 30

2

1

2

3

3

Strut HeatersProbe HeaterTermination

Drive Coil

Feedback Coil

Ultrasonic Vibrating Probe40KHz Nominal

Magnet

Strut HeatersProbe HeaterTermination

Drive Coil

Feedback Coil

Ultrasonic Vibrating Probe40KHz Nominal

Magnet

4

4

5

6

5

7

6

7

8

8

9

9

10

10

11

12

13

14

15

16

17

18

19

20

1

2

3

4

21

5

22

6

7

23

8

24

9

25

10

26

1

27

28

29

Ω

2

30

3

Campbell Scientific (Canada) Corp. | 14532 131 Avenue NW | Edmonton AB T5L 4X4 | 780.454.2505 | www.campbellsci.caAUSTRALIA | BRAZIL | CANADA | COSTA RICA | FRANCE | GERMANY | SOUTH AFRICA | SPAIN | UNITED KINGDOM | USA