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| A100R Contact Closure (Switching) Anemometer |
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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). The reed switch is mercury-wetted which results in bounce-free operation.
No power is required 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.
Common questions about the A100R/K:
What is the A100R/K variant and why/when should it be used?
What is the "K" in A100R/K for?
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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:
/HE-4 Internal Anti-Icing Heater/HE-1 & /HE-2 External/Retrofit Anti-Icing Heaters/WR Marine Version
/K Version with optimised cosine response (see above)
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.
RoHS: The reed-switch in the A100R and A100R/K contains a very small amount of mercury which ensures that the contact is "bounce-free" for maximum reliability. Unfortunately, these products will come into the scope of the EU RoHS Directive during 2014 which will mean that we will no longer be able to use mercury wetted reed switches in these products. Before 2014, we plan to introduce upgraded/replacement products which will use "dry" (non- mercury) reed-switches. Updated specifications will appear on this page when they become available. As 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 (/WR version: 0.6m/s) | | Maximum Windspeed: | over 75m/s (146Kts) | | Temperature Range: | -30 to +70 °C operating (-50 to +70 °C storage - mercury in reed switch reezes at -38°C) | | 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 (or 0..60Hz = 0..75 m/s approx.) | | Rotor: | 3-cup R30S (standard) | | Dimensions: | This instrument is constructed using our standard rotor and anemometer body design and dimensions. |
Notes: | | | 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
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Windspeed Limited (trading as Vector Instruments),
115 Marsh Road, RHYL, North Wales, LL18 2AB, United Kingdom
Tel: +44 (0) 1745 350700 Fax: +44 (0) 1745 344206
Email: sales@windspeed.co.uk
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Website design and content is copyright (c) 2003-2011 Windspeed Limited (unless otherise stated). All trademarks are acknowledged.
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A100 Series Anemometers
