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Vector - Model A100R -Contact Closure Switching Anemometer
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. Note: Also consider our A100AC for an alternative anemometer model which is lower-cost, requires no power to operate, produces 2 pulses/revolution and does not contain mercury.
No power is required for the A100R models other than that necessary to detect the reed-switch contact openingclosing making this instrument ideal for use at remote sites.
NEW: The A100RK is a new variant of the A100R using the R30 Rotor from the A100L2A100LK (The A100RK "body" is exactly the same as the standard A100R). This ensures that the A100RK cosine response is optimised for applications requiring "First Class" performance such as Wind Assessment. The A100RK specification is the same as the standard A100R however it has a slightly different output calibration (approx 0.777Hz per ms rather than 0.8Hz per ms). In situations where the A100L2, A100LK or A100LM cannot be used (e.g. due to data logger input limitations) using the A100RK will result in improved performance compared to the standard A100R.
Common questions about the A100RK:
What is the A100RK variant and whywhen should it be used?
What is the "K" in A100RK for?
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 ExternalRetrofit 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.
Mercury & RoHS2 (RoHS Directive 201165EU): The reed-switch in the A100R and A100RK contains a very small amount of mercury which ensures that the contact is "bounce-free" for maximum reliability. The mercury content may prohibit the use of the A100R in some countriesstates, however there is currently no issue with them in the EU. These professionalindustrial A100R products will come into the scope of the updated EU RoHS Directive 201165EU during 2017 which will mean that we will no longer be able to use mercury wetted reed switches in these products. We will soon be introducing upgradedreplacement A100R models which will use "dry" (non- mercury) reed-switches to make the A100R range RoHS compliant. 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 configuredspecified to adequately debounce the input channel being used in order to prevent incorrect windspeed readings (due to contactswitch "bounce" being mis-interpreted as pulses from the anemometer).
Alternatives to the A100R & A100RK:
If you are not able to use the A100R models due to the mercury content, please consider our other anemometer models (which do not contain mercury) such as the new A100AC or the popular A100LK & A100LM.