____________________________Weather Station____________________________

 

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WIND - VANE

 

 

Wind Direction Sensor

: Wind Vane.

Sensing

: Vane coupled to linear endless potentiometer.

Starting threshold

: Better than 0.5 meters/sec.

Range

: 0 to 357 degrees (3 degrees electrical gap in the Potentiometer

Output

: 0 to 5 kilo ohm resistance ( 0 to 357 degrees).

Resolution

: 1 degree.

Accuracy

: +/ 3 degrees.

Operating Temperature

: -40 to + 60 degree Celsius

Construction of sensor body

: Brass housing, stainless steel shaft and aluminum vane

 

PRINCIPLE OF OPERATION
Wind Vane is a counter balanced, low threshold wind vane. A Linear, wire wound endless potentiometer is coupled to the vane by an SS shaft. As the vane turns, it rotates a stainless steel shaft  which is coupled to the potentiometer. This potentiometer has excellent linearity, very low starting torque.

The north of the wind vane is marked on its body. This line is to be aligned with actual North with the help of prismatic compass, at the time of installation. Sensor gives minimum resistance at North (i.e., 0 degree approximately 20 ohms ). The resistance output linearly proportional to the position of the wind vane

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ANEMOMETER

 

Wind speed Sensor

: 3 Cup Anemometer.

Sensing

: 3 cup assembly mounted on friction free shaft and coupled to a chopper.

Starting threshold

: 0.3 meters/sec.

Range

: 0 to 65 meters/sec.

Distance constant

: 2.5 Meters

Output

: TTL pulses output proportional to wind speed Built in line driver to drive long cable > 50 ohms loop resistance.

Accuracy

: Better than 0.5 m/s up to 10 m/s + 2% FSD

Diameter of cup

: 50 mm.

Diameter of cup assembly

: 165 mm.

Construction of sensor body

: Brass housing and stainless steel shaft .

 

Principle Of Operation:

ANEMOMETER is a fast response, low threshold op to electronic anemometer. When rotated by wind, a chopper on the anemometer shaft Interrupts an infra red light source , generating pulses from a photo transistor. The signal is amplified and fed through a line driver . The frequency is proportional to wind speed. The anemometer is provided with a 3 pin connector for easy replacement and comes with 10 meters of shielded cable.

For operation at low temperature the sensor can be supplied with a built in heater The Anemometer can be supplied with a 20W 24 V DC built in heater for operation at low temperatures.

Note : these specifications are likely to change without notice.

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RELATIVE HUMIDITY 



Sensing

: Solid state capacity type sensor.

Resolution

: 0.1 %.

Range

: 0 to 100 % operating at -40 C to +50 C

Accuracy

: ± 3% of full scale reading.

Operating Temperature

: -40 o C to +50 o C.

Power requirement

: + 5 volts DC.

Power consumption

: ~ 4 mA.

Output

: 0- 1V for 0 to 100% humidity

Weather Shield

: Weather shield with weather proof reflective white paint coating.

Size of body

: 250 (H) x 90 mm diameter. (with weather shield)


PRINCIPLE OF OPERATION:  

Humidity sensor features an improved design to provide highly accurate and rapid measurements. The humidity sensor is a thin film capacitor element. A dielectric polymer absorbs water molecules from the air through a thin metal electrode and this causes a capacitance change proportional to humidity. The response is essentially linear. A sintered filter is provided to protect the sensor element from dirt, atmospheric pollutant and water condensation.

A solid state electronic circuit is built in each probe to produce 0 to 1000 M. Volts output signal corresponding to relative humidity value 0 to 100%. The output is single ended.

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RAINFALL SENSOR


 

Sensor

: Tipping bucket rain gauge.

Sensing

: Magnet and reed switch (on-off output).

Resolution

: 0.5 mm.

Accuracy

: better than + 5%

Operating Temperature

: -40 o C to +50 o C. with built in heater(optional)

Rim diameter

: 203 mm.

Collecting area

: 325 mm².

Material

: Raingauge shell made of FRP. Bucket made of    stainless steel and mounting assembly of powder coated brass.( SS316 body optional)

Capacity

: Unlimited.

Sensitivity

: 0.5 mm or, 0.2 mm (rainfall per pulse)

 

PRINCIPLE OF OPERATION:  

It uses a tipping bucket mechanism to produce a contact closure every time it receives a predetermined quantity of rainfall . The body and funnel are made of FRP (Fiber glass Reinforced Plastic), rim is made of gun metal. All parts having contact with water are made of stainless steel. Each tip of the bucket produces an on-off output when the magnet passes over the reed switch.

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DATALOGGERS FOR TEMPERATURE/PRESSURE/ HUMIDITY

 

 

Sunpro Instruments (I) Pvt. Ltd.,
presents 8 ch / 16 ch / 24 ch / 32 channels process scanners & datalogger for any process parameter like pH / cond. / Temp. / Pressure / level / humidity / flow etc. On line/ Off line datalogging with computer printer output as well as Computer connectivity with software available.
Microprocessor based L.E.D/L.C.D. display scanners / dataloggers in din rack mounted enclosure will have easy operative connectors with feather touch front key operations with menu to feed according to site conditions like speed/logging time/scan time/ Input signals etc.
Universal input available & suitable scans time with display, with hold / skip facility, common set point & common output for alarm relay 3/5 amp can be incorporated. Individual scan channel indication by separate L.E.D. possible.
“WE UNDER TAKE VALIDATION / MAPPING CALIBRATION JOB IN HOUSE /ON SITE FOR TEMP. / PRESSURE / HUMIDITY / AIRVELOCITY ETC. TRACABLE TO N.P.L. STANDARDS & CERTIFY THE SAME.”