B.3 wiring – Campbell Scientific CNR4 Net Radiometer User Manual

Page 53

Appendix B. CNF4 Heater/Ventilator

B.3 Wiring

aking the differential

measurement.

TABLE B-1. CR1000 and CR3000 Datalogger Connections for Differential Measurement with

Heater/Ventilator Control

The following table shows the recommended datalogger wiring for using the
CNR4 sensor with the CNF4 heater/ventilator while m

Function

Wire Color

CR1000

CR3000

Pyranometer Up Signal

Red

Differential Input (H)

Pyranometer Up Reference

*Blue

Differential Input (L)

Pyranometer Down Signal

White

Differential Input (H)

Pyranometer Down Reference

*Black

Differential Input (L)

Pyrgeometer Up Signal

Grey

Differential Input (H)

Pyrgeometer Up Reference

*Yellow

Differential Input (L)

Pyrgeometer Down Signal

Brown

Differential Input (H)

Pyrgeometer Down Reference

*Green

Differential Input (L)

Shield Clear

Thermistor

Thermistor Signal

White

Single-Ended Input

Thermistor Voltage Excitation

Red

Voltage Excitation (VX)

Voltage Excitatio (VX)

Thermistor Signal Reference

Black

Shield Clear

CNF4 Heater/Ventilator

Ventilator Power

Red

SW12V

SW12V-1

Ventilator Ground

Blue

Heater Power

Green

SW12V

SW12V-2

Heater Ground

Yellow

Shield Clear

*Jumper to

with user supplied wire

Pull back wires for Pt-100 (grey, brown, green, and yellow), which are not in use, and tie them around the TEMP
cable using a cable tie or electrical tape to avoid possible damage to the Pt-100, due to electrical short circuit.

Do not use the SW12 channel of a CR1000 or CR3000 to

CAUTION

simultaneously power the heater and ventilator.

Simultaneously powering the heater and ventilator will
exceed the current limit of the SW12 channel. If the heater
and ventilator need to be used at the same time, connect
the CNF4 to the 12V channel instead of the SW12 channel
and use an external relay to switch the power on and off.
Refer to Section 4.1 of the CR1000 and CR3000 manual
for details on the 12V current source limits.

B-7