Vector Instruments

United Kingdom

See product on windspeed.co.uk

The Porton™ Anemometer is a highly sensitive but robust transducer in which the rotational speed of a 3-cup rotor is measured by means of a photo-electronic pulse generator and ratemeter. An analogue d.c. voltage output is obtained which is substantially linear with respect to windspeed allowing accurate averaging of windspeed data. The standard range A100 instrument gives 0..10v for 0..100Knots, the high range A100H instrument gives 0..7.5v for 0..75m/s. For low windspeed use, variants are available giving increased output voltages. All rotors are supplied with

h individual calibration data traceable to national standards, and the low torque offered by the precision ball-race mounted shaft ensures a low thresholdspeed (0.15m/s) and good repeatability. The small size and light weight of the A100 series anemometers together with the unique gravity sensitive fastener for the rotor facilitates use in portable applications. These instruments also feature a remote calibration system. 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. Specification Highlights: Threshold: 0.15m/s (0.3Kt) Starting Speed: 0.2m/s (0.4Kt) Stopping Speed: 0.1m/s (0.2Kt) Maximum Windspeed: over 75m/s (146Kts) Temperature Range: -50 to +70 °C Accuracy (Pulse O/P): 1% of reading (10..55m/s), 0.1m/s (0.1m/s..10m/s) Linearity (Pulse O/P): 0.7% FRO (10..55m/s) Distance Constant: 2.3m +/-10% (R30 rotor) Accuracy (Analog O/P): 1% FRO (10..55m/s, cosnt. temp/supply voltage using cal facility). Supply Voltage: 10..30V DC (max 30mA, typically less than 15mA, see note below) Analog Output Signal: 0 to 10V = 0 to 100Kts (A100), 0 to 7.5V = 0 to 75m/s (A100H) Pulse Output Signal: 0V / 7.5V, at 10Hz per Knot (A100) or 10Hz per m/s (A100H) Rotor: 3-cup R30 type (standard) Dimensions: This instrument is constructed using our standard rotor and anemometer body design and dimensions.
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