The Micro Response Wind Sensors have been carefully designed to provide accuracy, sensitivity, dependability, and ease of use. They are sensitive enough to catch the slightest breeze, yet rugged enough to withstand gale force winds. Fixed keying of the sensor bodies makes orientation necessary one time only. The crossarm can be installed quickly and accurately on a tower or mast. Micro Response Wind Sensors are selected when the requirement is for high response, low maintenance sensors.
The 200-2020 Micro Response Wind Vane 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.
As the vane turns, it rotates a stainless steel shaft held in place with instrument-grade bearings. A waterproof, wirewound potentiometer with zero gap 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 dual-wiper potentiometers. Electronic switching in the signal conditioning module provides a range of 0-540°.
The 200-2030 Micro Response Anemometer is a highly responsive and rugged 3-cup anemometer designed to measure very low wind speeds (0.5 mph threshold). It is constructed entirely of stainless steel and anodized aluminum to resist corrosive environments. Like its wind vane counterpart, the micro response anemometer has an aerodynamically shaped body and utilizes a labyrinth to prevent dust and water from reaching the bearings.
Rotation of the main shaft by the cup assembly moves a slotted disc through a photon beam, which is generated by a long-life infrared LED. The interruption of the beam causes a pulse output with a frequency proportional to wind speed. A quick release waterproof connector is standard. The photon-coupled chopper is mounted on the connector and can be removed from the body simply by removing the connector.
One other type of micro response anemometer is available, similar to 200-2030 except in terms of output. The 200-2031 utilizes a dc generator to produce a dc voltage proportional to wind speed. The main shaft couples the cup assembly directly to the generator. Output is approximately 5.5 mV/mph.
The 200-20201 Heaters are available for use in cold climates to minimize freezing of vane and anemometer shafts. The heater assembly 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. 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; one thermostat will control any number of heaters.
The 200-2023 Crossarm is recommended for mounting the vane in conjunction with the micro response anemometer. A mast adapter is available for mounting either sensor alone on a 1-inch (25 mm) o.d. mast. Once installed and oriented, the sensors can be removed from the crossarm or mast adapter for maintenance and reinstalled without reorientation. A keyed connector allows replacement in the original position only.