Benefits and Features
Well-suited for long-term, unattended applications
Accurate and rugged
Mounts to a mast, crossarm, or user-supplied pole
Compatible with most Campbell Scientific data loggers

Technical Description
The HMP155A uses a HUMICAP180R capacitive thin film polymer sensort o measure RH, and a PRTt o measure temperature.
A warmed probe option ensures accurate measurements and better long-term stability in high-condensing environments, where required.
To reduce the current drain, power can be supplied to the HMP155A only during measurement when the sensor is connected to the datalogger's switched 12V terminal. Dataloggers that do not have a switched 12 V terminal, such as the CR510 or CR7, can use the SW12V switched 12V deviceto switch powerto the sensor only during measurement.