Humidity and Temperature Transmitter for Demanding Meteorological Applications

Abbildung 1: Der neue EE33-M Feuchte & Temperatur Messumformer ist ideal für anspruchsvolle Anwendungen in der Meteorologie geeignet. (Foto: E+E Elektronik GmbH) / Figure 1: The new EE33-M humidity and temperature transmitter is ideal for demanding meteorological applications. (Photo: E+E Elektronik GmbH)

Abbildung 2: EE33-M Feuchte & Temperatur Messumformer mit Strahlungsschutz LAM630. (Foto: E+E Elektronik GmbH) / Figure 2: EE33-M humidity and temperature transmitter with radiation shield LAM630. (Photo: E+E Elektronik GmbH)

Abbildung 3: Herzstück des EE33-M ist der beheizte, monolithische rF/T-Sensor HMC01. (Foto: E+E Elektronik GmbH) / Figure 3: Core of the EE33-M is the heated, monolithic HMC01 RH/T sensor. (Photo: E+E Elektronik GmbH)

EE33-M is the newest addition to the well proven EE33 transmitter series for relative humidity (RH) and temperature (T). The heated RH sensor, the additional heating of the RH sensing probe and a separate T probe ensure highly accurate outdoor measurements even under condensation conditions. A special coating protects the RH sensor against pollution. Together with a radiation shield, EE33-M is ideal for high-end meteorology applications.

The heart of EE33-M is the innovative, monolithic HMC01 sensor, developed and manufactured in thin-film technology by E+E Elektronik. HMC01 combines the RH sensor and heating resistor on a single substrate. A dual heating system prevents condensation on the RH sensor, on the sensing probe and on the filter cap, which leads to extremely short response time and fast recovery after condensing conditions. The measuring principle with separate RH and T probes enables precise continuous measurement even at permanent high humidity. The proprietary E+E coating protects the RH sensor element and its leads against corrosive and electrically conductive pollution.

A radiation shield is essential for best performance outdoors. The sensing probes of EE33M match modern radiation shields with forced ventilation such as LAM630.

EE33-M calculates all RH and T related parameters such as dew point temperature, absolute humidity, and mixing ratio. An optional connection cable allows for easy adjustment and configuration of the transmitter. The optional RS485 interface enables a network of up to 32 transmitters.