 2020 Micro Response
Vane
Description
This is a highly reliable, low threshold wind direction sensor. It responds
to winds as low as 0.5 MPH. The machined aluminum body is aerodynamically
shaped to combat sensor-induced turbulence. A labyrinth beneath the vane assembly
prevents water and dust particles from reaching the sealed bearings at the
top of the shaft. The reinforced, lightweight foam tail has a butyrate skin
and a stainless steel counterweight.
Features
As the vane turns, it rotates a stainless steel shaft held in place with
instrument-grade bearings. A waterproof conductive plastic potentiometer is
coupled to the base of the shaft. This potentiometer has excellent linearity.
Very low torque 0.15 inch ounces is required to move the wiper. The use of
a single wiper doubles the life expectancy of the potentiometer compared to
the dual-wiper potentiometers. Electronic switching inside the signal conditioning
module provides an output range of 0° to 540°.
Heaters
Optional heaters are available for use in cold climates to minimize freezing
of vane and anemometer shafts. The heater assembly, Model 20201, mounts between
the top and bottom sections of the sensor body. It consists of a solid block
of aluminum with a machined cavity containing a 20-watt heater. The block
acts as a heat sink, and the heater raises the block's temperature 20°C above
the ambient temperature. Environmental connectors are supplied with the heater.
An optional thermostat is available.
Mounting
The Model 2023 crossarm is recommended for mounting the micro response vane
in conjunction with the micro response anemometer. A mast adapter is available
for mounting either sensor alone on a l-inch 25mm O.D. mast. Fixed keying
of the sensor bodies makes orientation necessary one time only.
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