Casella-cel Nomad portable weather station Manual de usuario descargar pdf (Pagina 43)

Operating temperature: -25° to +80°C

6.2.3 General Specification

Part number: 187012B

Supply voltage: 8 to 24 V (supplied from environmental case)

Power consumption: Typically 10 mA at 12 V

Output calibration

Temperature: 0 to 1 V for -40 to + 60°C

Humidity: 0 to 1 V for 0 to 100% RH

6.3 Wind Speed Sensor

The sensitive three cup anemometer is

mounted at one end of the sensor head

cross-arm. The rotational speed is monitored

using an infra-red light source, interrupter

and optical sensor that provides 20 pulses

from 0 to 5 V per revolution. This

non-contacting design can measure wind

speeds up to 75 m/sec.

The instrument has an anodised

aluminium alloy outer case that offers a

durable, all-weather construction suitable for

installation in harsh environments.

An output from this sensor is led to

a terminal box on the sensor cross arm, from

where a single sensor cable is taken to the

7-pin socket on the bottom panel of the environmental case.

6.3.1 Wind Speed Sensor Specification

Part number: 178031C

Sensor type: Three cup anemometer

Transducer: Optical interrupter

Maximum wind speed: 75 m/s

Starting velocity: Typically 0.3 m/s

Distance constant: Typically 3.5 m/s

Time constant: Typically <0.5 s

Resolution: 7.84 cm

Non-linearity: <±0.6 %

Accuracy: ±0.3 m/s below 3 m/s

±3% over 3 m/s

Output calibration: 12.75 Hz/m/s

Output: 20 pulses per revolution 0 to 5 V

Operating temp: -20°Cto+70°C

Stabilisation time: <1 sec from power on

Supply voltage: 6 - 28 V DC (supplied from environmental

case)

Power consumption: 3 mA

6.4 Wind Direction Sensor

The weather vane is mounted at the other end of the sensor head cross-arm

from the anemometer.

DO NOT loosen the fitting of the weather vane, as this carries a

guide mark “N” that must point north to orient the cross arm correctly.

The wind vane is a small lightweight GMR design that offers a rapid

response to changes in wind direction with virtually friction free sensing. The

01057

Figure 12: Wind speed sensor

Standard Sensors

Page 43 of 68

NOMAD Portable Weather Station

Users Handbook

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