Modular Humidity and Temperature Sensor type PM15P0 pages

Galltec Mess- und Regeltechnik GmbHt

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

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

PM15P
Modular Sensor for Humidity and Temperature
with hx processor

Digital Measuring Head PMU-P

Description of the Sensor
The sensor PM15P measures the air humidity by means
of a humidiy-dependant condenser. The capacitive
Mela® humidity measuring element, produced using
thinfilm 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 humidity or temperature values measured are
calculated in the exchangeable PMU-P measuring
head, with the calibration values stored there, and
communicated on to the following electronic transmitter
components as calibrated digital measuring values.
The PMU-P measuring heads are calibrated and
thus enable a replacement within seconds. Replaced
measuring heads can be recalibrated in the factory.
The transmitter with the hx processor uses the values
of the relative humidity and the temperature to calculate
the dew point temperature, the enthalpy, the mixing ratio, the absolute humidity or the wet-bulb temperature,
in accordance with the laws of physics. The values are
emitted at two analogue outputs with the standardised
signals 0...10VDC, 0...1VDC, 0...20mA or 4...20mA.
The outputs can be configured differently and are defined using the software.
The Mela® measuring element is protected by a filter
and a basket guard. The sensors are designed for
unpressurised systems, the measurement medium is
non-aggressive air.
Please consult the application instructions for the
sensing 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.
Ex works. Depending on the specific range of application a regular recalibration t
of the measuring head (PMU-P) has to be effected.
2)t
Higher accuracies on request.
3)t
The accuracy of the calculated values depends on both the operating point in t
t accordance with the hx diagram and on the primary values measured.
4)t See load diagram
1)t

Humidity
measuring range ....................................................... 0...100%rh
measuring accuracy 10...90%rh at 25°C ............... ±1.5%rh 1)2)
t
at <10%rh or >90%rh .............................................. ±2%rh
t
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
Temperature
measuring element .......................................... Pt1000 1/3DIN
measuring range ................................................... -40...+85°C
measuring accuracy ...................................... ±0.15 K at 25°C
resolution ..................................................... 0.01 K (read out)
influence of temperature (TK) ............................... <0.005 K/K

Transmitter PMO15P with hx processor

physical outputs
t
dew point temperature ................................. 0...70°C 3)
t
enthalpy .................................................. 0...80 kJ/kg 3)
t
mixing ratio ................................... 0...100g/kg dry air 3)
t
absolute humidity ............... 0...20g/m³ or 0...100g/m ³)t
t
wet-bulb temperature .............................. -10...+50°C 2)
t
relative humidity ......................................... 0...100%rh
t
temperature ranges ..............
ttt
........... -30...+70°C; 0...+50°C; 0...100°C
There are respectively 2 physical values available at the output
response time t63 at v=2m/s with PTFE-pocket filter ..... < 15 s
electrical outputs
t
voltage .......................... 2x 0...1VDC or 2x 0...10VDC
t
current ................................................. 2x 0(4)...20mA
linearity ....................................................................... <0.25%
power supplyttt
....... 0...1V ................ 6...30V DC
tttt
....... 0...10V ............ 15...30V DC
tttt
...... 0(4)...20mA .... 6...30V DC 4)
load ..................................................................... acc. diagram
electromagnetic compatibility ........................ ref. EN 61326-1
min. load resistance for voltage output ..................... 10 kOhm
consumption of electronics ......................................... <10 mA
permissible ambient temperature ......................... -20...+70°C
max. air speed ............................................................... 15m/s
minimum air speed across the measuring head
for output:t
2x 0(4)...20mA ......................................... 1 m/s
t
t 2x 0...10V, 2x 0...1V ........................... ≥0.5 m/s
protective system transmitter .......................................... IP 64
housing material ................................................. plastic, black
mounting position ........................................................ optional
cable connection 6 x AWG24 ......................................... 2.5 m

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 : June 2012
PM15P_E. Subject to modifications.