HUMOR 20
High-precision Humidity Calibrator
The role of humidity calibrations that are accurate, reproducible,
and documentable is becoming more and more important.
ISO quality guidelines and regulations according to FDA guidelines in the pharmaceutical industry, etc., require that humidity
instruments have a traceable, accurate calibration.
The humidity calibrator HUMOR 20 developed by E+E is the
ideal reference instrument for these requirements.
The HUMOR 20 can be used in the humidity range of
10-95 % RH both for monitoring cylindrical sensors (transmitters,
hand-held instruments,...) and also for monitoring instruments
with cubic dimensions (data loggers, wall instruments,...).
HUMOR 20
A temperature sensor integrated in the measurement chamber
also permits the monitoring of an optional temperature output.
The HUMOR 20 is traceable to international standards and can
be delivered with an official, internationally recognised OEKD
calibration certificate. Due to its high accuracy, the HUMOR 20 is
the basis for accredited calibration laboratories for relative
humidity.
Based on its operating principle, the HUMOR 20 can be used
under typical conditions in a laboratory climate. This means that
expensive, fully air-conditioned rooms are not necessary. For
operation HUMOR 20 requires only distilled water, filtered oil-free
Automatic Calibration Module
air with a pressure of 10 bar and a power supply between
100-230 V AC. The specimen can be powered by 24 V DC that is available directly on the HUMOR 20.
Operation
The operation of the HUMOR 20 is based on a fundamental two-pressure process and thus is similar to
instruments used in national bureaus for standards.
Air
p
1
Air or nitrogen at a pressure p1 is led through a waterfilled saturation chamber and saturated to 100 % RH at
p1. By means of a reduction valve, the saturated air is
reduced to the ambient pressure p and fed into the
measurement chamber. Due to the construction, the
saturation chamber and the measurement chamber are
at the same temperature. Under these conditions, the
water-vapour partial pressure ews is reduced at the
same ratio as the total pressure.
Essentially, the following applies:
e = e
From this it follows that: RH = e / ews = p / p
ws
p / p
*
1
Schematic Illustration of a Two-pressure Reactor
1
Thus, the generated relative humidity essentially depends on the ratio of the two pressures.
Constructionspecific deviations from this ratio are corrected during factory adjustments. By adjusting the
pressure p1 the relative humidity is brought to the desired value in the measurement chamber.
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Pressure regulator
p , T
e
Water T, p
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1
e
ws
HUMOR 20
HUMOR 20
Reduction
valve
p1 --> p
Measurement
chamber
Saturation
chamber
Typical Applications Features
calibration laboratories
reference device
bureau of standards
manufacturers of measurement instruments
independent of ambient temperature
highest accuracy
traceable calibration
easy handling
traceable to international standards
OEKD certificatable
Automatic Calibration Module
The optional available Automatic Calibration Module enables an automatic set point adjustment of the desired
reference humidity. With the software, included in the scope of supply, checkpoints, stabilisation times, etc.
can be set. Furthermore the instrument allows for an automatic print out of a calibration protocol for a
transmitter with analogue standard interface.
Calibration and Adjustment using HUMOR 20
24 V DC electrical supply for the test sample are provided
directly at HUMOR 20.
Furthermore, four inputs for the voltage or current outputs
of transmitters are available when using the Automatic
Calibration Module for generating calibration protocols.
The software which is included in the scope of supply
allows the user to record measurement values in a log file,
to print out calibration protocols and to configure or to
readjust the HUMOR 20.
Software - Features:
- Freely selectable numbers of measuring points and
stabilisation times when using the Automatic
Calibration Module
- Creation and print out of professional calibration
protocols with:
- Specimen number
- Calibration date
- Reference and actual values
- Temperature display can be switched between °C and °F
- 1-point customer humidity calibration of the HUMOR 20
- 6-point customer humidity calibration of the HUMOR 20
- 1-point customer temperature calibration
- Reset of HUMOR 20 to factory calibration
HUMOR 20
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