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Windspeed Ltd (Vector Instruments), 113 Marsh Road, RHYL, N. Wales, LL18 2AB, United Kingdom.
Windspeed Limited (trading as Vector Instruments)
Tel.: +44 (0) 1745 350700 (08:30-13:00hrs UK time)
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 Thursday, May 30 2024  Home [arrow]  Products [arrow]  Relative Humidity [arrow]  H301 Search site:  

Latest Weather...
(Rhyl, N.Wales, UK)
Wind Speed:  7.7 mph
Wind Direction:  313 °
Air Temp.:  12.0 °C
Rel. Humidity:  95.5 %
Rain (last Hr):  0.0 mm
(updated at: 04:36 UTC)

Please call/email us if you need:

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*** Celebrating more than 40 years manufacturing & servicing High Quality Vector Instruments Anemometers and Windvanes at Windspeed Ltd ***
H301 Aspirated Psychrometer
Datasheet: login to download NOTE: THIS PRODUCT IS NO LONGER AVAILABLE (MAY 2010).

This page remains here "for reference only".

We will, however, endeavour to maintain the availability of spares/consumables for existing users of this product where possible.

Our H301 Aspirated Psychrometer is an aspirated humidity sensor using the "Wet and Dry Bulb" method for reliable determination of air temperature and relative humidity. A pair of 100 Ohm 4-terminal platinum resistance elements (RTD/PRT) are used as the sensing elements.

A double-walled element enclosure minimizes errors due to thermal radiation and an optional radiation shield (/RS) is available to reduce errors due to sunlight.

A long-life motor/fan ensures a high air flow past the sensing elements for an accurate wet-bulb depression.

The instrument construction is weather resistant while retaining easy access to the sensing elements for calibration, cleaning and wick replacement. A 500ml water reservoir provides for over 7 days continuous operation.

Note: This sensor does not contain any signal conditioning or amplifiers to process the sensing element signals. Most data loggers can be configured to measure PRT/RTD sensors in a 3 or 4-wire bridge circuit, and can often also be set to control the fan/motor too.

Specification Highlights:

  • Accuracy:
  • 0.2°C (in normal meteorological conditions)
  • Temperature Range:
  • -20 to +65 °C
  • Response Time:
  • 50 seconds
  • Maximum Wind Speed:
  • over 75 m/s (170mph, 150kts)
  • Sensing Elements:
  • Two, each 100 Ohm RTD/PRT (100 Ohm+/-0.033% at 0°C) 1/3-DIN43760
  • Configuration:
  • Wired as a pair of 4-terminal resistors
  • Air Speed Past Elements:
  • 4 m/s, BS4485 (fan rated 40m3/hour)
  • Fan/Motor Supply:
  • 12V DC (typically at 350mA)
  • Rated Fan/Motor Life:
  • 12,000 Hours (12V DC, 83% RH to DIN40046)
  • Weight:
  • 1.4Kg
  • Cables:
  • Fan/Motor Power: 5m 2-core
    Elements: 5m, 8-core (stranded 7/0.2mm, braided shield)

    This product is manufactured to special order .
    Specifications are correct at time of writing and may change without notice. Please contact us to confirm the latest specifications.
    Please call/email us if you would like access to additional product information, data and specification sheets for this product.
    Windspeed Ltd (Vector Instruments)
    Windspeed Limited (trading as Vector Instruments),
    113 Marsh Road, RHYL, North Wales, LL18 2AB, United Kingdom
    Tel: +44 (0) 1745 350700   Fax: +44 (0) 1745 344206
    Website design and content is copyright (c) 2003-2024 Windspeed Limited (unless otherise stated). All trademarks are acknowledged.
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