Feuchtigkeits- und Temperatursensoren Serie A und B

The A series with exchangeable sensor part consists of a calibrated sensor part with 4-pin plug and a transmitter with analog output. Sensor part and transmitter can be combined and matched with each other, according to the physical and mechanical requirements. The measured humidity and temperature values are calculated in the calibrated sensor part with the calibration values stored there, and are passed on as digital measurement values.

In the two-piece design B series, sensor part and transmitter are firmly connected. The sensors can be readjusted on site using buttons and LED. They can also be factory-calibrated and readjusted using software.

The sensors of the A and B series with integrated hx processor measure humidity by means of a humidity-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 transmitters with the hx processor use 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 1). The values are emitted at two analogue outputs with the standardised signals 0….1VDC or 0 ….10VDC or 4 ….20mA.

The outputs can be configured differently and are defined using the software. Further measuring ranges on request.

The sensor parts and transmitters of the B series are firmly connected. In addition, the installation of a passive temperature element is possible (e.g. Pt100). All further technical features correspond to the ones of the A series.

The scope of delivery includes the sintered high-grade steel filter ZE13. If a better dynamics should be required, we recommend to use the filter type ZE04 together with a PTFE filter which protects the humidity sensing element directly. We recommend to do so in particular at low air speeds and also its increased service life, even under more challenging operating conditions (pollutant impact or permanent humidity > 95 %rh). The use of different filters is not possible. The sensors are designed for unpressurised systems (except the ...HD, 0D, ED... version), the measurement medium is non-aggressive air.

Please consult „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.

1) The accuracy of the calculated values depends on both the operating point in accordance with the hx diagram and on the primary values measured. The hx processor operates in the range -30 °C < T < +70 °C, 5 % rh<F<95 % rh. Values outside this range are not calculated, the last valid value is displayed. Normal atmospheric pressure of 1013.25 mbar is used when calculating the hx values.

Humidity

Measuring range - 0...100%rh 

Measuring accuracy *)

• 10...90%rh dla 23°C - ±1.5%rh
• dla <10%rh lub >90%rh - ±2%rh

Influence of temperature  (TK) - ±0.02%rh/K

Hysteresis - < 1%rh

Response time  t₆₃ dla v=2m/s - < 10 s

*) ex works. Depending on the specific range of application a regular recalibration of the sensor parts  has to be effected. Higher accuracies on request.

General Data

Measuring medium 

•  air, non-aggressive 

Operating voltage 

• 0...1 V ...... 6...30 VDC / 6...26 VAC
• 0...10 V ......... 15...30 VDC / 13...26 VAC
• 4...20 mA ...........................10...30 VDC

Power consumption

• < 7 mA

Load RL (current output)

Load resistance (voltage output)

• 0...10 (1) V ............. ≥ 10 (2) kOhm

Admissible ambient temp

•  on the transmitter -40...85°C
• use of duct sensor up to  150°C (TH do 200°C) -40...50°C

Degree of protection ........ transmitter IP65

• measuring head  (see table)
• plug-in connection sensor part - >  transmitter IP67

material of housing sensor part 

• stainless steel
• transmitter - pressure die casting of alu

Directive about electromagnetic compatibility 2014/30/EU

• DIN EN 61326-1 wydane 07/13
• DIN EN 61326-2-3 wydane 07/13

Temperature

Measuring element  - Pt1000 kl.B

Output range  - w tabeli

Measuring accuracy at 23°C *) - ±0.15K

Influence of temperature (TK)  - <0.005 K/K

*) depending on the extension of the output range, max. 0.25 K

Options

Digital display

• 2 lines, 3 digits + 1 decimal place 
• display approx. 21 x 40 mm², digit approx. 8 mm hig