Anemometers and Windvanes in action!
Windspeed Ltd (Vector Instruments), 113 Marsh Road, RHYL, N. Wales, LL18 2AB, United Kingdom.
Windspeed Limited
Click for info on: Wind Speed sensors Click for info on: Wind Direction Sensors Click for info on: Masts + Mountings Click for info on: Air Temperature sensors Click for info on: Masts + Mountings Anemometer, Windvane and Air Temperature sensors
 Saturday, June 15 2024  Home [arrow]  Products [arrow]  Anemometers [arrow]  A100R, A100R/K Search site:  

Latest Weather...
(Rhyl, N.Wales, UK)
Wind Speed:  7.8 mph
Wind Direction:  336 °
Air Temp.:  14.4 °C
Rel. Humidity:  75.7 %
Rain (last Hr):  0.0 mm
(updated at: 15:13 UTC)

Please call/email us if you need:

Translate using Google:

This website requires Javascript and Cookies to be enabled for correct operation. Privacy Policy...

Use subject to Terms & Conditions.

GDPR: to request or decline communications containing marketing, news & updates from us, click HERE.
Celebrating more than 50 years manufacturing & servicing High Quality Vector Instruments Anemometers and Windvanes at Windspeed Ltd
A100R Contact Closure (Switching) Anemometer
Datasheet: login to download The A100R is an anemometer designed for "run of wind" or average wind speed measurements when used with an electronic counter or a data logger.

The calibrated 3-cup R30 series rotor drives an actuator in a carefully balanced magnet system with the resulting varying field operating a reed switch (contact opens and closes once per rotor revolution).

No power is required for the A100R models other than that necessary to detect the reed-switch contact opening/closing making this instrument ideal for use at remote sites.

NEW: The A100R/K is a new variant of the A100R using the R30 Rotor from the A100L2/A100LK (The A100R/K "body" is exactly the same as the standard A100R). This ensures that the A100R/K cosine response is optimised for applications requiring "First Class" performance such as Wind Assessment. The A100R/K specification is the same as the standard A100R however it has a slightly different output calibration (approx 0.777Hz per m/s rather than 0.8Hz per m/s). In situations where the A100L2, A100LK or A100LM cannot be used (e.g. due to data logger input limitations) using the A100R/K will result in improved performance compared to the standard A100R.

An A100R-02 (and A100R-02/K) variant is also available which produces twice as many pulses (i.e. double the output frequency) vs the standard A100R at the same windspeed. Please contact our sales desk for details.

Common questions about the A100R/K:
Construction is from anodised aluminium alloys, stainless steels and weather resisting plastics for exposed parts. Precision corrosion resistant ball-races and a stainless steel shaft enable the R30 rotor response to produce a highly sensitive yet robust instrument suitable for continuous exposure to the weather.

Options for this anemometer include:
Note: /WR, /HE-1 and /HE-2 are not recommended for high precision applications.

The recommended mounting adaptors for use with this instrument are our type 405 and 405-1 series.

RoHS2 (RoHS Directive 2011/65/EU): The reed-switch in the current A100R and A100R/K models does NOT now contain any mercury. The A100R and A100R/K design was changed in late 2016 to use a "dry" reed-switch in order to make the A100R compliant with RoHS2. The small amount of mercury content in the reed-switches of older A100R units (serial numbers before/lower-than 15000) may prohibit the use of those older units in some countries/states, however any new A100R units supplied (serial numbers 15000 and higher/later) contain no mercury and are not affected by any such restrictions.

The change to using a mercury-free reed-switch also means that the minimum operating temperature is now extended down to -40C.

Extensive testing has been conducted to select a "dry" (mercury-free) reed-switch which has the same durabilty/reliability as the older type, however ALL "dry" reed-switches can exhibit a small amount of "contact bounce". Because the A100R cable and built-in RC filter tends to damp/filter any contact-bounce, and the vast majority of dataloggers incorporate "debouncing" on the inputs used to connect reed-switch anemometers, this change should not affect operation, however users should ensure that their logger is indeed configured/specified to adequately debounce the input channel being used in order to prevent incorrect windspeed readings (due to contact/switch "bounce" being mis-interpreted as pulses from the anemometer).

Specification Highlights:

  • Threshold:
  • 0.2m/s
  • Maximum Windspeed:
  • over 75m/s (146Kts)
  • Temperature Range:
  • -40 to +70 °C operating (-50 to +70 °C storage)
  • Accuracy:
  • 1% of reading between 10 and 55m/s, 2% above 55m/s. 0.1m/s for 0.3..10m/s (or 0.7..10m/s for /WR version)
  • Distance Constant:
  • 2.3m +/-10% (R30 rotor)
  • Switching Voltage:
  • Rated 72V dc maximum, recommended operation: between 1V and 5V.
  • Switching Current:
  • Rated 40mA maximum, recommended operation: 1mA or less. Note: switch life is not reduced by operation in dry (0mA) circuits.
  • Switch Life:
  • Rated 25 x 109 operations minimum, equivalent to at least 20 years use.
  • Duty Cycle:
  • 50% +/- 5% up to 50m/s (+/-10% up to 75m/s)
  • Impedance:
  • 120 Ohm resistance in series with the switch, plus 10nF capacitor across line for interference suppression.
  • Calibration:
  • 0.8 rotor revolutions per metre, one contact closure per revolution = 1 contact closure per 1.25m of wind, i.e. 0..60Hz = 0..75 m/s approx. (Note: the A100R-02 variant produces 2 contact closures per 1.25m of wind, i.e. 0..120Hz = 0..75m/s approx)
  • Rotor:
  • 3-cup R30S (standard)
  • Dimensions:
  • This instrument is constructed using our standard rotor and anemometer body design and dimensions.
  • Wiring/Connections (Cable colours):
  • For wiring details click HERE
  • Cable:
  • 3m (9ft10in) permanently attached 4-conductor* cable with braided shield/screen as standard. Longer lengths are available to order (up to 115m). Spec: Def Stan 61-12 part 4, 0.22mm˛(?24AWG). *Note: 2 conductors unused in non-/HE4 models.
  • MEASNET/IEC Calibration Certificate (optional extra):
  • The A100R/K Anemometer is available with an IEC/MEASNET Calibration Certificate (for an additional charge)
  • Regulatory/Certifications: :
  • UKCA CE marks CE and UKCA Marked for RoHS3 (RoHS2+Phthlatales amendments) and EMC

  • Obtaining best accuracy
  • Reliability & Safety
  • Specifications are correct at time of writing and may change without notice. Please contact us to confirm the latest specifications.

    Additional Information:

    This instrument is commonly used in conjunction with our W200P, W200G and SRW1G Windvanes.
    FAQ: Obtaining Slope/Offset Figures
    FAQ: Does my old A100R contain mercury?
    FAQ: IP Ratings
    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
    Website design and content is copyright (c) 2003-2024 Windspeed Limited (unless otherise stated). All trademarks are acknowledged.