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WetBoss Relative Humidity 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 mystique 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 recalibrate 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 whimper. 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-manufactured 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.
| Item |
Code |
Catalog |
| WetBoss*100 (complete) |
7.1900 |
WB100 |
| add digital meter, installed |
|
add -D |
| Relay Module, 2 thresholds; in separate box |
|
RM420i |
| Filter assembly |
|
WB-FLT/A |
| RH calibration kit |
|
KAL-KIT/RH |
The WetBoss is US/MSHA classified G, issue #49 for use in hazardous methane
areas when properly powered through intrinsic safety barriers. Unit is also
covered under MSHA MultiBoss evaluation file, Classes G, H and L, issues 95,
32 and 64, respectively - as well as in Canada NRCan(EMR) #1053 - for use in
hazardous (methane and natural gas).
Call for additional information and to order.
WetBoss is a registered Rel-Tek trademark.
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