Casella-cel Automatic weather station Instrukcja Użytkownika Pobierz pdf (Strona 25)

3.7 Rainfall Sensor

The tipping bucket raingauge should be

positioned horizontally at least twice the

height of any obstruction (weather station

tripod) away from the obstruction.

It is a well proven method of

monitoring rainfall with a divided bucket

assembly mounted on pivots. The bucket

assembly is adjusted to tip each time an

amount of water proportional to 0.2 mm of

rainfall has collected in one or other side of

the bucket. Therefore, each time the bucket

tips, a signal proportional to precisely 0.2 or

0.5 mm of rainfall is sent to the logger.

The gauge has a body and funnel

constructed of aluminium alloy, with an

accurately machined “Septum Ring”.

The aluminium base plate is

equipped with levelling screws and a spirit

level for precise adjustment.

3.7.1 Rainfall Sensor Specification

Part number: 100000E (0.2 mm) no de-bounce

100573E (0.5 mm) no de-bounce

Transducer: Tipping Bucket

Aperture: 400 cm

Resolution: 0.2 or 0.5 mm per tip as relevant

Accuracy: ±1%

Capacity: Unlimited

Operating temp: 1°Cto85°C

Supply Voltage: 7 - 20 V DC (supplied from environmental

case)

Power Consumption: Typically 2-3 mA

Output calibration: Debounced 0 to 5 V pulses.

Cable: 9 m cable supplied

3.7.2 Tipping Bucket - Sensus Channel Configuration

Optional Sensors

Tipping bucket rainfall sensor

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Automatic Weather Station

Assembly & Commissioning Handbook

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