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Delta OHM
Absolute humidity and temperature

Absolute humidity and temperature

Product catalog summary

Overview
The HD3817T and HD38V17T are active transmitters designed for measuring absolute humidity and temperature. They offer outputs of 4...20mA current or 0...10Vdc voltage. These devices are suitable for industrial applications, particularly in environments with high temperatures and humidity variations.

Specifications

Absolute Humidity: Measurement range of 0...130 g/m³, with a sensor working range of 0 to +200°C. Accuracy is ±3g/m³ at 35 g/m³ and 40°C.
Temperature: Measurement range of 0 to +200°C using a 4-wire Pt100 sensor. Accuracy is 1/3 DIN.
Response Time: 60 seconds for humidity and 10 seconds for temperature to reach 63% of the final value.
Power Supply: Standard 24VAC, with options for 115VAC or 230VAC.
Construction: Stainless steel probe with a 20µm sintered bronze filter, housed in a polycarbonate case with IP66 protection.

Applications
These transmitters are used in industries such as chemical, textile, food, paper production, and wood drying. They are particularly effective in environments where traditional sensors fail due to high temperatures or contamination.

Installation and Calibration
The devices are factory-calibrated and require no user calibration. Installation should ensure good air circulation, and the probe can be mounted using various fittings.

Electrical Connections
Connections are specified for power supply and probe outputs, with detailed terminal and cable color instructions provided.

Ordering Information
When ordering, specify power supply, stem length (127 mm or 227 mm), and probe cable length (2 m or 5 m).

Compliance and Standards
The devices comply with CE standards for safety and electromagnetic interference, including EN61000 and EN55020.

Catalog excerpts

HD3817T… HD38V17T… [ I ] Trasmettitore attivo di umidità assoluta e temperatura [ GB ] Absolute humidity and temperature active transmitter [ E ] Transmisor activo de humedad absoluta y de temperatura [ F ] Transmetteur actif d’humidité absolue et température [ D ] Aktiver Transmitter für absolute Feuchte und Temperatur

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[ GB ] [ GB ] Description The HD3817T... and HD38V17T... are double absolute humidity and temperature active transmitters with 4...20mA current or 0...10Vdc voltage outputs, respectively. Absolute humidity is the ratio between the mass of water vapour and the measured volume of air, and is expressed in g/m3. The transmitters of the HD3817T... family may be used in materials humidity control during a drying process. When the materials are dried through heating or a hot air flow, the air absolute humidity increase is directly proportional to the quantity of water lost by the materials. A control...

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Calibration The instruments are calibrated in the factory; no calibration is required by the user. Installation Notes Each probe is calibrated in the factory with its transmitter: A probe cannot be used onto another transmitter. The transmitter has to be installed into a position with good air circulation. The probe orientation is not important. To set the probe in a ventilation channel, into a duct, inside a dryer, etc. you can use the HD9008.31.12 flange, a PG16 (10…14mm) metallic fairlead or a 3/8” biconical universal fitting. HD9008.31.12 flange H L A A D D L PG16.12 metallic fairlead D =...

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Delta Ohm srl - Via G. Marconi, 5 - 35030 Caselle di Selvazzano (Pd) - Italy Tel. 0039 0498977150 r.a. Fax 0039 049635596 - E-mail: [email protected] Web Site: www.deltaohm.com RoHS 2002/95/EC 01 05.08 Manufacture of portable and bench top instruments Current and voltage loop transmitters Temperature - Humidity - Pressure Air speed - Light - Acoustics pH - Conductivity - Dissolved Oxygen - Turbidity Elements for weather stations - Thermal Microclimate SIT CENTRE N°124 Temperature - Humidity - Pressure - Air speed Photometry/Radiometry - Acoustics CE CONFORMITY • Safety: EN61000-4-2, EN61010-1 Level...

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All Delta OHM catalogs and technical brochures

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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