PMU-P0 pages

Galltec Mess- und Regeltechnik GmbH

D-71145 Bondorf . Germany
Tel. +49 (0)7457-9453-0 . Fax +49 (0)7457-3758
E-Mail: sensoren@galltec.de . Internet:www.galltec-mela.de

MELA Sensortechnik GmbH

D-07987 Mohlsdorf (Thüringen) . Germany
Tel. +49(0)3661-62704-0 . Fax +49(0)3661-62704-20
E-mail:mela@melasensor.de . Internet: www.galltec-mela.de

Digital Humidity-Temperature Sensor
PMU-P
Order No. 620101023594
with asynchronous ASCII transmission protocol,
calibrated for relative humidity and temperature in
exchangeable, plug-in design.

Technical Data

The exchangeable digital sensor PMU-P is equipped with
the tried and tested Mela® humidity measuring element
FE09/4. Protected by a PTFE pocket filter, the measuring
element measures the air humidity. The pocket filter consists of porous vapour-permeable material and protects the
sensor element from most dirt, dust and pollutants.
The electronics and the plug contacts on the back are extrusion-coated with plastic to make them watertight.
The capacitive Mela® humidity measuring element, produced using thin-film technology, consists of a base plate, on
which the electrodes are housed, and a hygroscopic polymer layer above it. The hygroscopic polymer layer absorbs
water molecules from the medium to be measured (air) or
releases them, thereby altering the capacity of the condenser.
The electronics sets off the humidity values measured in
this way against the calibration values it has stored and
emits them via the plug contacts in the form of calibrated,
digital ASCII protocol. The sensor head is also equipped
with a temperature probe Pt1000 1/3DIN which is used for
both acquiring the air temperature and also for temperature
compensation in the humidity measurement by the PMUP.
The PMU-P measuring heads are calibrated and thus enable an easy replacement. Replaced measuring heads can be
recalibrated in the factory.
Please consult the "application instructions for the sensing
application
elements" (product info sheet no. A 1) or check with the
manufacturer for further information which you need to
bear in mind when using humidity sensors with capacitive
sensing elements.

1)

2)

Ex works. Depending on the specific range of application a regular
recalibration of the sensor head (PMU-P) has to be effected.
H
Higher accuracies on request.

Temperature
measuring element .................................... Pt1000 1/3DIN
measuring range ............................................. -40...+85°C
measuring accuracy ................................. ±0,15 K at 25°C
resolution ................................................. 0,01K (read out)
influence of temperature (TK) .......................... <0,005 K/K
General
permissible ambient temperature ................... -20...+70°C
response time t63 at v=2m/s with PTFE-pocket filter ..... < 15 s
protective system sensor ........................................... IP20
protective system plug ............................................... IP40
measuring medium ...... air, pressureless, non-aggressive
Vcc ........................................................................ 3.3VDC
output .......................................... ASCII (Galltec-protocol)
housing .................................................................... plastic
consumption of electronics ..................................... < 5 mA
maximum air speed ................................................ 15 m/s
mounting position .................................................. optional
electromagnetic compatibility.......................... EN 61326-1
contacting .... 4Pin female socket, series 719 from Binder

Accuracy of humidity in %rh at 25°C

Humidity %rh

Description of the sensor

Humidity
measuring range ............................................... 0..100%rh
measuring accuracy 10...90%rh at 25°C ........ ±1,5%rh 1)2)
at <10%rh or >90%rh .................................. ±2%rh
at <10°C or >40°C .............. ±0,05%rh/K additional
resolution ............................................. 0,01%rh (read out)
hysteresis ............................................................... < 1%rh
protection against dust ......................... PTFE pocket filter

Measuring value of humidity %rh

Calibration values (humidity generator)

This information is based on current knowledge and is intended to provide details of our products and their possible applications. It does not, therefore, act
as a guarantee of specific properties of the products described or of their suitability for a particular application. It is our experience that the equipment may
be used across a broad spectrum of applications under the most varied conditions and loads. We cannot appraise every individual case. Purchasers and/or
users are responsible for checking the equipment for suitability for any particular application. Any existing industrial rights of predection must be observed.
The perfect quality of our products is guaranteed under our General Conditions of Sale. Issue : April 2011 PMU-P_