Casella CEL Airborne particulate monitoring system - Manual (Page 17)

HB3256-03 Page 15
Temperature and Humidity Sensor Wiring.
The combined temperature and humidity sensor is supplied with a radiation screen. The unit
should be secured to a suitable support structure free from possible shading effects or error
sources.
The temperature / humidity probe is connected to the APM system as detailed below.
Sensor connection Sensor wire
colour APM system connection
Supply +ve RED 12 volt supply (on terminal strip)
Supply 0v BLUE 0 volt reference (on terminal strip)
Temperature signal YELLOW CH1 +
Humidity signal GREEN CH1 -
Screen Yellow/Green Chassis earth point
Before applying power to the system, confirm all system wiring is correct.