Humidity & Temperature Devices > Sensors

HygroMer WA-1 - The perfect Sensor for water activity applications

Water acclivity - humidity sensor

•Established on the market over 10 years

•Advanced mechanical design and chemical resistance

•Good long-term stability

A capacitive polymer humidity sensor is a special type of humidity sensor based on the use of polymeric materials to detect changes in humidity. The sensors utilize the properties of polymers that react to moisture and thereby influence the capacitance of the sensor. The evaluation electronic convert the capacitive value into humidity value.

The HygroMer WA-1 sensor stands for Industrial with contained space and is considered for measurements with moderate temperatures.

Applications

•Pharmaceutical & Food industries

•Industrial high-temperature

•Chemical industries, processes and manufacturing

WA-1 Dimension

Innovation in Humidity Measurement

•Best long-term stability

•Robust mechanical construction

•Response time < 15 s

•0...100 %RH

•-50...170 °C

•PTFE surface protection

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Functions

Description

Characteristic polynomial

5th degree polynomial

Y = A0 + A1*x + A2*x2 + A3*x3 + A4*x4 + A5*x5

A0 = 2.00000E+02

A1 = 7.12550E-01

A2 = -1.19025E-03

A3 = 2.01789E-04

A4 = -1.59209E-06

A5 = 4.65615E-09

Specifications

Capacity:	220 pF ±50 pF
Humidity operating range:	0…100 %RH
Temperature operating range:	-50...170 °C
Accuracy at 23 °C:	±1.0 %RH
Hysteresis (4 hours each at 10 %RH - 90 %RH - 10 %RH):	< 0.5 %RH
Response time τ63:	<15 s (at 23 °C and 1 m/s)
Long-term stability:	<1 %RH / year
Uncompensated temperature deviation:	-0.15 %RH/°C (30…90 %RH)
Frequency range (without DC components):	5...50 kHz
Max. Voltage:	±12 VDC

The shown data are guide values. The resistance of the sensor strongly depends on the temperature and humidity conditions as well as on

exposure duration to the pollutant. Allowed fault caused from the pollutant: ±2 %RH (10…90 %RH).

Pollutant	Formula	Max.Workplace Allowed Concentration		Allowed Concentration Continuous Operation
Pollutant	Formula	(ppm)	(mg/m3)	(ppm)	(mg/m3)
Acetic acid	CH3COOH	10	25	800	2000
Acetone	CH3COCH3	1000	2400	3300	8000
Ammonia	NH3	25	18	5500	4000
2-Butanone (MEK)	C2H5COCH3	200	590	3300	8000
Chlorine	Cl2	0.5	1.5	0.7	2
Ethanol	C2H5OH	1000	1900	3500	6000
Ethyl acetate	CH3COOC2H5	400	1400	4000	15000
Ethylene glycol	HOCH2CH2OH	100	260	1200	3000
Ethylene oxide	C2H4O	3		3
Formaldehyde	HCHO	1	1.2	2400	3000
Hydrochloric acid	HCl	5	7	300	500
Hydrogen sulfide	H2S	10	15	350	500
Isopropanol	(CH3)2CHOH	400	980	4800	12000
Methanol	CH3OH	200	260	3500	6000
Nitrogen oxides	NOx	5	9	5	9
Ozone	O3	0.1	0.2	0.5	1
Petrol		300	1200		150000
Sulfur dioxide	SO2	5	13	5	13
Toluene / Xylene	C6H5CH3	100	380	1300	5000

The data in this documentation result from experience and testing. Depending upon site conditions (temperature, dampness, pollutants etc.)

the values can differ. A warranty claim cannot be derived from it.