ELPRO HUMIDITY SENSOR
ELPRO dataloggers for humidity measurement
HOTDOG DH1, DH3
ECOLOG TH1, TH2
HOTBOX SE HygroClip (sensor)
Sensor properties HYGROMER® C94
Operating range
Humidity 0…100 %rh
Temperature in °C -50…+200 °C (sensor 3087: -35...+70°C or sensor 3087-B: -35...+110°C)
Air velocity in m/s
Without sensor protection 3 m/s
With sensor protection 40 m/s
Output signals capacitance range
Reproducibility 0.5 %rh
Long-term stability <1%rh/12 months
Time constant at 1m/s air speed <12 s
Typical, operating life >10 years
Reversibility reversible after condensation
Pressure dependence no
Maintenance interval depends strongly on application
Energy requirement/stability none/immediately stable
Humidity sensors
ELPRO-BUCHS uses the HYGROMER® C94 humidity sensor, this is a high-quality product, which constantly
proves its performance in long-term use, including measurement sites where high levels of pollution are present.
Changing environmental influences and experience with pollutants are continuously monitored and necessary
developments implemented. The measuring range is between 0…100 %rh at -50...+200°C. Thanks to modern
electronic temperature compensation, the humidity is accurately measured and displayed over the entire working
range.
Response time/Time constant
The time constant of a sensor is defined as the time required to perform 63 % of a humidity change. The time
constant is larger at low temperature, low air movement and high humidity. The time constant also increases when
a filter is used. The filter reduces the airflow over the sensor and a slower diffusion of water molecules results in a
slower response time. Therefore humidity equilibrium is reached after an extended period of time.
Reproducibility
The specifications stated refer to a humidity cycle of 10-95-10 %rh.
Long term stability
Measurement experiences of the used humidity sensor (HYGROMER® C94) under different conditions have
shown an excellent long term stability of <1%rh in 12 month. The stability of this sensor may be influenced by some
environmental parameters like: dust, vapours and concentration of chemical substances.
Application recommend Operating
Calibration interval life
Room conditions 12 month 10 –15 years
Incubator with 40 °C and 85 %rh 12 month 10 years
High humidity, permanent >90 %rh 6 – 12 month 10 years
High humidity, cheese storage room
with ammonium concentration 6 month 5 – 10 years
Polluted air with dust 3 – 6 month 3 – 6 years
Chemically aggressive environment 2 – 4 month 1 – 4 years

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