Young Intrinsically Safe Wind Monitor Model 05501 - Manual (Page 2)

Page 1
05501LM-90(D)
MODEL 05501LM
WIND MONITOR
Intrinsically Safe with 4-20 mA Outputs
INTRODUCTION
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.
INITIAL CHECK-OUT
When the instrument is unpacked, check it carefully for signs of
shipping damage.
WIND SPEED SPECIFICATION SUMMARY
Operating Range 0 to 60 m/s (134 mph)
Gust Survival 100 m/s (220 mph)
Sensor Type 18 cm diameter 4-blade helicoid
polypropylene propeller, 29.4 cm air
passage per revolution
Distance Constant 2.7 m (8.9 ft.) for 63% recovery
Threshold Sensitivity 1.0 m/s (2.2 mph)
Output Signal 4-20 mA for 0 to 50 m/s (100 m/s optional)
Power Requirement: 10 to 30 VDC at 20 mA max
WIND DIRECTION (AZIMUTH) SPECIFICATION SUMMARY
Range 360° mechanical,
355° electrical (5° open)
Sensor Balanced vane,
38 cm (15 in) turning radius.
Damping Ratio 0.3
Delay Distance 1.3 m (4.3 ft) for 50% recovery
Threshold Sensitivity 1.1 m/s (2.4 mph) at 10° displacement
Natural Wavelength 7.4 m (24.3 ft) Damped
7.2 m (23.6 ft) Undamped
Output Signal 4-20 mA for 0 to 360°
Power Requirement: 10 to 30 VDC at 20 mA max
GENERAL
Ambient Temperature -50 to 50°C (-58 to 122°F)
Intrinsic Safety Class I, Division 1, Groups A, B, C, D
when installed with approved
Intrinsically Safe Barrier
(see Wiring Diagram)
Entity Approval Vmax = 30V
Imax = 100 mA
Ci = 0.01 uF
Li = 0.0 uH