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To ensure precise measurements, the probe is always installed in a ra-diation shield. Condensation on the probe in early morning mist or in fog results in incorrect measurements due to delayed measurement when the weather conditions change due to sunlight or if the fog lifts.In this case, a ventilat-ed radiation shield does not provide any improvement, as it cannot prevent condensation on the sensor.
The EE33 series humidity and tem-perature sensor is the only one on the market which is equipped with a double-heated probe. Both the sensor tube and the sensor element are heated. Condensa-tion on the probe is prevented even under the most extreme conditions and the values meas-ured always correspond to the actual conditions.
How does the heated measure-ment probe work?
Double probe heating means that both the sensor tube and the sen-sor element are separately heated. A monolithic MNC01 humidity / tem-perature sensor is used as the sen-sor element. This is operated in a controlled heating mode. The image made with a thermal imaging camera clearly shows how the sensor tube heater works. The front section of the probe is heated to an excess temperature of 5 – 7°C which reliably prevents con-densation.
The primary parameter which is measured is the dewpoint, which is always independent of the excess temperature due to the probe and
Air humidity and temperature play an important role in mete-orology. Highly accurate measurements of these climate pa-rameters form the basis of accurate forecasts and meaningful records.
For sophisticated applications such as ice warning systems for road traffic it is essential to avoid delays in measurement due to condensation and to prevent false measurements due to icing. The EE33 fulfils these require-ments, as both the probe and the sensor element are heated. The version K transmitter provides the dewpoint temperature as the initial measurement. With version J, all the calculated humidity parameters are available via the additional temperature sensor.
Comparison of the EE33 with other measuring transducers
E+E Elektronik Ges.m.b.H. • Langwiesen 7 • A-4209 Engerwitzdorf • AustriaTel: +43 (0)7235 605-0 • Fax: +43 (0)7235 605-8 • [email protected] • www.epluse.com
LG Linz Fn 165761 t • VAT-ID-No. ATU44043101 • place of jurisdiction: A-4020 Linz • DVR0962759
HUmIDITy mEAsUREmENT IN mETEoRoLoGy
R
Ges.m.b.H.
YOUR PARTNER IN SENSOR TECHNOLOGY
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ratur [°C]
relative
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rF]
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8:01 8:45 9:28 10:11 10:54 11:37 12:21 13:04
Zeit [hh:mm]
ventilierter StrahlungsschutzRM Young
EE33 Bauform Jmit beheizter Fühlertechnologie
ventilierter Strahlungsschutzlow cost
nicht ventilierter StrahlungsschutzE+E / HA010506
Temperaturverlauf
Messwertverzögerung durch Betauung um 2h30min
Ventilated radiation shield RM Young
EE33 version J with heated sensor technology
Low-cost ventilated radiation shield
E+E unventilated radiation shield
Temperature curve
• Application conditionsMeasurement range: 0...100% rel. hum.; -40...180°COutput: 0...1 / 5 / 10 V or 0 / 4...20 mAAccuracy: ± 1.3% rel. hum. ± 0.2℃
• E+E solutionEE33-JHumidity measuring transducers for high-humidity and chemical applications
High accuracy measurement of relative humidity, dewpoint and temperature even at high humidity close to the condensation or with high chemical contamination.
E+E Elektronik Ges.m.b.H. • Langwiesen 7 • A-4209 Engerwitzdorf • AustriaTel: +43 (0)7235 605-0 • Fax: +43 (0)7235 605-8 • [email protected] • www.epluse.com
LG Linz Fn 165761 t • VAT-ID-No. ATU44043101 • place of jurisdiction: A-4020 Linz • DVR0962759
R
Ges.m.b.H.
YOUR PARTNER IN SENSOR TECHNOLOGY
sensor heating. All other humidity parameters derived can be calculated by the use of an additional temperature probe.
The additional temperature probe is positioned so that the humidity probe heater does not affect the temperature measurement. Very accurate meas-urement results are obtained if the probes are installed in two separate radia-tion shields.
EE33 sensor tube - thermal image
