Description: The RH-1A Relative Humidity probe is an inexpensive, wide input range, low-power humidity sensor. The RH-1A contains a rugged capicitive humidity sensing element that can output RH from 0 to 100% and withstand direct immersion. The RH-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. See the Data Logger Selection Guide for help with locating the appropriate instrument for your inputs.

Data logger Interface:

The RH-1A provides a linear 0 to 1Vdc output corresponding to 0 to 100% relative humidity. This sensed signal can be directly connected to one of the ModuLogger "Mini" analog inputs, one of 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:

Operating Temperature	-10 to 60C
Accuracy	better than +/-3% over 10 to 90%RH
Operating Range	0 to 100%RH
Stability	better than +/-2% over 2 years
Excitation Voltage	7 to 28 Vdc
Current Consumption	2 mA
Output Signal	0 to 1 Vdc corresponding to 0 to 100%RH
Probe Dimensions	0.47" dia, 2.7 " long
Cable	Jacketed multi-conductor; (specify length at time of order)

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Logic Beach, Incorporated
8363-6F Center Drive
La Mesa, CA 91942
Phone: (619) 698-3300
Fax: (619) 469-8604