Campbell Scientific HMP45C Temperature and RH Probe - Manual (Page 22)

Appendix A. Wiring for Older HMP45C Probes
TABLE A-2. Connections for Differential Measurements for Old Wiring Configurations
Color Description
CR10(X), CR510,
CR500
CR1000, CR3000
CR800, CR9000,
CR23X 21X, CR7
Yellow Temperature Differential Input (H) Differential Input (H) Differential Input (H)
Jumper to
Purple
Signal Reference Differential Input (L) Differential Input (L) Differential Input (L)
Blue Relative Humidity Differential Input (H) Differential Input (H) Differential Input (H)
Purple Signal Reference Differential Input (L) Differential Input (L) Differential Input (L)
Orange Power Control Control Port Control Port Control Port
Red Power 12 V 12 V 12 V
Black Power Ground G G
Clear Shield G
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A-2