Casella-cel Automatic weather station Manual do Utilizador descarregar pdf (Página 27)

The installed device may be specified as optimised for either rain, frost

or dew. The rain sensing version incorporates a heater to dry the surface once

rain has ceased, and also to eliminate it’s sensitivity to the formation of dew.

The sensor will respond to a single 1 mm diameter droplet of distilled

water.

3.9.1 Leaf Wetness Sensor Specification

Part number: 187081B

Transducer: Three element carbon electrode

Length: 150 mm

Supply voltage: 9 - 18 V DC

Power consumption: 5 mA Max

Output Calibration Wet =1.5 V approximately

Dry = 0 V

Sensing area 15 x 30 mm

Operating temp. -10°C to +55°C

Cable: 3 m cable supplied

3.9.2 Leaf Wetness - Sensus Channel Configuration

3.10 Grass Temperature Sensor

The grass minimum temperature

measurement is achieved by locating a

shielded thermometer at a fixed height

above the grass, supported on a small frame.

3.10.1 Grass Temperature Sensor Specification

Part number: 120650B

Sensor type: Semi conductor current generator

Figure 20: Grass temperature sensor

Page 27 of 34

Automatic Weather Station

Assembly & Commissioning Handbook

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Casella-cel Automatic weather station Manual do Utilizador Página 27