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Appendix B. CNF4 Heater/Ventilator

B.3 Wiring

The following table shows the recommended datalogger wiring for using the

CNR4 sensor with the CNF4 heater/ventilator while making the differential

measurement.

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

Heater/Ventilator Control

Function Wire Color CR1000 CR3000

Pyranometer Up Signal Red Differential Input (H) Differential Input (H)

Pyranometer Up Reference *Blue Differential Input (L) Differential Input (L)

Pyranometer Down Signal White Differential Input (H) Differential Input (H)

Pyranometer Down Reference *Black Differential Input (L) Differential Input (L)

Pyrgeometer Up Signal Grey Differential Input (H) Differential Input (H)

Pyrgeometer Up Reference *Yellow Differential Input (L) Differential Input (L)

Pyrgeometer Down Signal Brown Differential Input (H) Differential Input (H)

Pyrgeometer Down Reference *Green Differential Input (L) Differential Input (L)

Shield Clear

Thermistor

Thermistor Signal White Single-ended Input Single-ended Input

Thermistor Voltage Excitation Red Voltage Excitation (VX) Voltage Excitation (VX)

Thermistor Signal Reference Black

Shield Clear

CNF4 Heater/Ventilator

Ventilator Power Red SW12V SW12V-1

Ventilator Ground Blue G G

Heater Power Green SW12V SW12V-2

Heater Ground Yellow G G

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

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.

CAUTION

B-7

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Campbell CVF4 Specifiche Pagina 49