PM15P
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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-Teichwolframsdorf . 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 of the measuring head (PMU-P) has to be effected. 2) Higher accuracies on request. 3) The accuracy of the calculated values depends on both the operating point in accordance with the hx diagram and on the primary values measured. 4) See load diagram 1) Transmitter PMO15P with hx processor 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 2013 PM15P_E. Subject

ESD protection advice All PM15P sensors are made up of a PMO15P transmitter with a PMU-P sensor head and contain components which can be damaged by the effects of electrical fields or by charge equalisation when touched. This is why the PMU-P sensor heads, that can be supplied separately and that are suitable for being exchanged on location, are packaged in conductive, reusable ESD protected bags. The following protective measures must be taken when exchanging a PMU-P sensor head on the PMO15P transmitter: • Before unpacking the PMU-P sensor head, ensure electrical potential equalisation...

PMU-P 6201010232AA relative humidity 0...100%rh ASCII temperature -30...70°C ASCII "plug and measure unit" (digital) (digital) relative humidity relative humidity relative humidity mixing ratio absolute humidity absolute humidity wet-bulb temperature relative humidity relative humidity relative humidity mixing ratio absolute humidity absolute humidity wet-bulb temperature further outputs and measuring ranges on demand Load for 0(4)...20mA current version 1200 Measuring value of humidity %rh Calibration values (humidity generator)

Transmitter with 2 outputs V DC or mA calibrated measuring head PMU-P ASCII Interface Connection diagrams internal bridge internal bridge When installing the sensors, the sensor outputs must not be connected to GND / V- / V+.