Intrinsically Safe Wind Monitor
The intrinsically safe Wind Monitor-IS is a high performance wind sensor approved for use in hazardous areas.
The Wind Monitor-IS can safely be used in Class 1, Division 1, Group A,B,C,D hazardous areas.* The wind speed sensor is a four blade propeller. The propeller drives a reliable, non-contacting transducer. The wind direction sensor is a durable molded vane. Vane angle is sensed by a precision, long-life potentiometer housed in a sealed chamber. Internal circuitry converts signals for wind speed and wind direction into separate, 4 to 20 mA current outputs. The instrument is constructed of UV stabilized plastic with stainless steel and anodized aluminum fittings. The instrument installs on standard 1 inch pipe.
*Tested in accordance with Safety Standard UL 913, Intrinsically Safe Apparatus and Associated Apparatus for use in Class I, II, and III Division I, Hazardous (classified) locations. Must be properly installed with approved Intrinsically Safe barrier.
Model 05501LM Wind Monitor IS is an intrinsically safe wind sensor that converts horizontal wind speed and direction measurements to calibrated 4-20 mA signals. Each signal is derived from independent 2-wire loop-powered circuits. The sensor operates over a wide ambient temperature range.
Intrinsic safety is achieved when the sensor is used with approved barriers. Intrinsically safe systems are recognized as practical and effective means of operating instruments in an explosive environment. The technique limits the amount of energy available to ignite explosive gases or ignitable mixtures. This is accomplished by controlling the amount of voltage and current in the hazardous area.
When used with an approved Intrinsically Safe barrier, the Wind Monitor IS can be used in Class 1, Division 1, Group A,B,C,D hazardous areas. The categories are defined as follows:
Class I - Locations in which flammable gases or vapors are or may be present in quantities sufficient to produce explosive or ignitable mixtures.
Division 1 - Locations in which hazardous concentrations in the air exist continuously, intermittently, or periodically under normal operating conditions
Group A - Atmospheres containing acetylene
Group B - Atmospheres containing hydrogen, or gases or vapors of equivalent hazard, such as manufactured gas.
Group C - Atmospheres containing ethyl-ether vapors, ethylene, or cyclo-propane
Group D - Atmospheres containing gasoline, hexane, naptha, benzine, butane, propane, alcohol, acetone, benzol, lacquer solvent vapors, or natural gas
The Wind Monitor IS is rugged and corrosion resistant, yet accurate and lightweight. Housing, nose cone, propeller, and other components are injection molded with U.V. stabilized plastic. Both the propeller and vertical shafts use stainless steel precision grade ball bearings.
Propeller rotation produces an AC sine wave signal with frequency proportional to wind speed. Internal circuitry converts this signal to a calibrated 4 to 20 mA current output.
Vane position is sensed by a 10K ohm precision conductive plastic potentiometer. This signal is also converted to 4 to 20mA output.
The instrument mounts directly on a standard one inch pipe, outside diameter 34 mm (1.34"). An orientation ring is provided so the instrument can be removed for maintenance and re-installed without loss of wind direction reference. Both sensor and orientation ring are secured to the mounting pipe by stainless steel band clamps. Electrical connections are made in a junction box at the base.