Description: The RHT-1A Relative Humidity probe is an inexpensive, wide input range, low-power humidity and temperature sensor. The RHT-1A contains a rugged capacitive humidity sensing element and a precision RTD for temperature sensing. The unit can measure RH from 0 to 100% and temperature from -10 to 60C (14 to 140F). The RHT-1A is of cylindrical shape with the connection cable projecting out of one end. The sensing element is field replaceable and is protected from dirt and grit by an integral membrane filter. The probe can withstand direct immersion and will recover to factory specifications after drying. See the Data Logger Selection Guide for help with locating the appropriate instrument for your inputs.

Data logger Interface:

The RHT-1A provides a linear 0 to 1Vdc output corresponding to 0 to 100% relative humidity. For temperature sensing a second output is provided which has a linear 0 to 1Vdc output corresponding to -40 to 60C. These sensed signals can be directly connected to the ModuLogger "Mini" analog inputs, the ModuLogger System Base or MLIM-1 Interface Modules and/or the HyperLogger™ HLIM-1 Interface Modules input channels. Scaling and other desired data manipulation is readily handled in the programming of the logger using the powerful HyperWare software.

The unit can be powered from a DC source in the range of 7 to 28Vdc and is quick to stabilize after application of power. Due to its quick stabilization after power-up, the unit can be powered on just prior to taking a reading, sampled, then powered off to conserve logger battery energy. The unit can be powered directly by the ModuLogger, Mini, or HyperLogger™ system batteries (optionally switched through a logger output relay) or from a PSM-2 Power Supply Module in conjunction with any of the Logic Beach data logging systems.

Specifications