Manual
1. Introduction
With the HYGROMER
®
meteorology probe MP 400A for measuring humidity and temperature, you have
purchased a precision measuring instrument which incorporates more than 25 years experience of the
company ROTRONIC AG in this special field.
Special resistance to air pollutants is achieved by the HYGROMER
®
sensor IN-1 which, in combination
with the sophisticated electronics, guarantees outstanding measuring accuracy. When the following
instructions are observed, many years of perfect operation and long-term stability of the probe and thus
reliable measurement are assured.
The HYGROMER
®
meteorology probe is a combined humidity and temperature probe for use in
meteorology and similar demanding applications, for example in tunnels, on motorways, airports etc.
Except for the sensor element, the HYGROMER
®
meteorology probe is protected against unintentional
penetration of humidity. Its linear voltage output has been matched to the requirements of data collection
and transmission systems.
We accept no liability for damage and disturbances which result from non-observation of these operating
instructions.
You can obtain further copies of these operating instructions either from ROTRONIC AG or one of our
representatives.
2. Start-up
The HYGROMER
®
meteorology probes can be connected to external power supplies and signal
processing circuits with the 4-pin Tuchel connector installed as standard.
(Connection diagram see chapter 8).
The probe must be protected against water splashes and rain. A weather and radiation protector is
available from ROTRONIC AG as an accessory. Additional sensor protection is necessary for air
velocities greater than approx. 20 m/s, otherwise the sensors can be damaged.
Important!
Incorrect voltage supplies and overloading of the outputs can destroy the probe!
3. Performance of measurements
The HYGROMER
®
meteorology probes (relative humidity and temperature) are factory adjusted before
delivery, for which reason checking upon reception of the instrument is not necessary as a rule.
The probe is ready for use half a second after being switched on.
Important!
Before a reliable measurement can be made, the measuring probe and medium to be measured must be
in temperature and humidity equilibrium.
Example: At 50 %RH and 23 °C, a temperature difference of 1 K (between sensor and the medium to be
measured) causes a humidity error of about 3 %RH!
The necessary adjustment time, which can last up to 30 minutes, depends upon several factors:
- Size of the humidity and temperature deviation of probe and medium before start of measurement
- Change of the measured values during the adjustment time.
The humidity measurement delivers a better picture of the progress of acclimatization since it reacts
much more quickly and more sensitively than the temperature measurement. The 1/10 percent display is
therefore very suitable as a trend display. If the display oscillates about a mean value, then adjustment is
completed.
Due to the HYGROMER
®
IN-1 sensor, specially developed for the HYGROMER
®
meteorology probe,
insensitivity to chemical influences far beyond the MAK value range is largely guaranteed (MAK =
Maximum workplace exposure)
InstructionManual_ML_MP400_V2.doc