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WetBoss?*100 RH Sensor -- Sensing humidity may seem easy, reflecting back on the original horsehairs and the like, but indeed, precise monitoring of RH is anything but
easy. There is a fair amount of snake-oil in the industry, i.e. specs boasting of 0-100% ranges, knowing full well that the very low and very high ends are only estimates, and shrouded by
the 5% FS tolerance.
The mysique deepens when one discovers the virtual impossibility of reliably field recalibrating an RH sensor. Recognizing that the only way to assure continued accuracy, Rel-Tek
engineered a field replaceable sensor head that can be simply plugged in without having to recalbrate the unit. In essence, the factory calibration follows the head, not the base unit. We
make no bones about it, our unit is dependable between 5-95%. And, we can assure continued accuracy throughout the entire life of the product.
Thus, the WetBoss*100 has evolved over a dozen years into an honest, dependable, quality product that does the job without a wimper. Every year or so you can replace the sensing
head -- a five minute job -- returning the sensor to its factory new calibration. Powered by 12-30VDC, 4-20ma, 2-wire hookup. It is MSHA classified for hazardous methane areas. A digital
meter can be purchased for front panel mounting to continuously display the RH reading in 1/2" high characters. The WetBoss*100 is US-manufactrured and serviced. Rely on Rel-Tek for the
best solutions.
Spec: 5-95% RH, 4-20ma, 2-wire transmitter
Technology: Capacitance detector
The WetBoss*100 senses ambient relative humidity (RH) and transmits a linear 4-20ma analog signal for remote readout. It consists of an electronic module and a sensor module, mounted in a
5x5x2" plastic housing supplied. The WetBoss*100 is powered by the signal current flowing in the current loop. The 2-wire hookup simplifies installation and checkout. The signal current
range corresponds with 0% and 100% RH, factory adjusted at 60-80F. Special circuitry maintains the 4-20ma signal accurate over a wide range of input voltages and line-plus-termination
resistances, Transmission range can be as far as several kilometers, depending on voltage drop conditions around the circuit. Required input voltage is 10-30VDC at sensor terminals.
The effective range of the WetBoss*100 is 5-95% RH, with accuracy of +/- 5% RH over an ambient temperature range of 0-70C, 32-150F. Storage temperature is -25 to +70C, -13 to 150F). Storage
humidity range is 0-100% RH, without condensation. Temperature dependence of RH readout is about +0.1% RH per degree C. Unit is calibrated at normal ambient conditions 22C (72F). A
calibration adjustment pot is provided. Electronic circuits are potted in epoxy for protection against physical damage, water and dust intrusion. Interchangeability of sensing modules is
normally within +/- 5% RH. Time constant in still air is about 10 minutes. An optional dual-screen dust filter protects the humidity sensing element from accumulations of dust, mud, etc.
The filter is replaceable.
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