Vaisala HMD70U Service Manual Page 50

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48
HMK15 Humidity Calibrator
No measuring instrument stays
accurate by itself. It is essential that
the functioning of an instrument
is periodically checked against a
reference. Vaisala has developed the
Vaisala Humidity Calibrator HMK15 to
make calibration and spot checking
of humidity probes and transmitters
easy and reliable.
Method Used by
Leading Laboratories
The operating principle of the
HMK15 is based on the fact that a
saturated salt solution generates a
certain relative humidity in the air
above it. The reading of the humidity
probe or transmitter can then be
adjusted accordingly. Many leading
laboratories use this generally
In addition to laboratory use, Vaisala Humidity Calibrator HMK15 is suitable for on-
site checks of humidity probes and transmitters.
accepted and reliable method to
calibrate humidity instruments.
Usually two or three different salt
solutions are used. Salts are chosen
according to the application.
Certified Salts
The HMK15 can be ordered with
certified and pre-measured salts.
A sample calibration is made from
each batch in Vaisalas Measurement
Standards Laboratory (MSL).
Calibrated Thermometer
The HMK15 can be ordered with
a thermometer, which is used for
measuring the temperature during
the calibration. It can also be used
for checking the temperature
measurement accuracy of the
transmitter. The thermometer can
contain either mercury (accuracy
±0.3 °C (±0.54 °F)) or red capillary
fluid (accuracy ±1.0 °C (±1.8 °F)).
FINAS Approved
Measurement Standards
Laboratory
Vaisala’s Measurement Standards
Laboratory is a FINAS accredited
calibration laboratory. FINAS is a
member of the EA (the European
Cooperation for Accreditation).
Features/Benefits
Easy and reliable calibration
of humidity probes and
transmitters
Based on saturated salt
solutions
Fast temperature equilibration
No external power required
Suitable for laboratory use
and on-site checks
Chambers and transit covers
make HMK15 easy to transport
Pre-measured certified salts
available
Vaisala Service Centers offer
accredited calibrations for
humidity, temperature and
barometric pressure.
thermometer with
calibration certificate
transit covers
for secure
transportation
and long-term
storage
three step plugs to fit all
chamber holes (12 mm,
13.5 mm and 18.5 mm)
Finnish Accreditation Service
K008 (EN ISO/IEC 17025)
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