User manual

User Manual

SlowSequence 'measure HC2S3 every 5 seconds

Scan (5,Sec,0,0)

'HC2S3 Temperature & Relative Humidity

`Note this forces and only works in sequential mode

`Contact Campbell Scientific if your program must work in pipeline mode

SW12(1) `switch on 12V

Delay(1,3000,mSec) `delays for 3 seconds

VoltSe(AirTC,1,mV2500,2,0,0,_50Hz,0.1,-40) `measure probe

VoltSe(RH,1,mV2500,1,0,0,_50Hz,0.1,0)

SW12(0) `switch off 12V

If RH>100 AND RH<103 Then RH=100

NextScan

EndProg

9.2 Example Programs using Differential Measurement

Instructions

Temperature and humidity are measured on differential input channels 1 and 2

respectively. The program sets relative humidity = 100 if the measured value is

> 100 but less than 103%. Values > 103% are not set = 100, and indicate a

problem with the sensor or its calibration.

Table 9-4. Wiring for

Differential Measurement Examples

Colour Description CR1000 CR10(X)

Brown Temperature 1H 1H

Jumper to

Yellow

Temperature Signal

Reference

1L 1L

White Relative Humidity 2H 2H

Yellow Signal Reference 2L 2L

Grey Power Ground G G

Clear Shield G

Green Power 12V 12V

For these examples the sensor is powered on continuously.