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Precipitation & Leaf Wetness Sensors

Precipitation sensors measure rainfall amount and intensity, while leaf wetness sensors detect moisture on plant surfaces after rain, dew or spray. Our range includes tipping bucket rain gauges for general and intense rainfall, a radar rainfall sensor that tells rain, snow and hail apart, plus a leaf wetness sensing grid, suitable for meteorological, hydrological and agricultural applications.


Model 52203 Tipping Bucket Rain Gauge.

R.M. Young
The model 52202/ 52203 Tipping Bucket Rain Gauge meets the specifications of the World Meteorological Organization. Extensive use of molded thermoplastic compounds gives maximum performance and resistance to corrosion.
Catchment area200 cm2
Resolution0.1 mm per tip
Accuracy2 % up to 25mm / h
OutputMagnetic reed switch, normally open
Operating temp-20 deg C to 50 deg C (model 52202 is heated for colder climates)
Measuring Rangen/a
52203 photo 1
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Model TE525mm Tipping Bucket Rain Gauge.

Texas Electronics
The TE525 series tipping bucket rain gages are manufactured by Texas Electronics. Both the TE525WS (8" orifice) and TE525 (6" orifice) measure in 0.01 inch increments; the TE525MM measures in 0.1 mm increments. These gages funnel precipitation into a bucket mechanism that tips when filled to a calibrated level. A magnet attached to the tipping mechanism actuates a switch as the bucket tips. The momentary switch closure is counted by the pulse-counting circuitry of Campbell Scientific dataloggers.
Catchment area24.5 cm (Orifice diameter)
Resolution0.1 mm per tip
Accuracy±1% up to 10 mm/hr, +0-3% 10-20 mm/hr, +0-5% 20-30 mm/hr
OutputPulse (magnetic reed switch)
Operating temp0° to +50°C
Measuring Rangen/a
TE525mm photo 1
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TE525mm photo 3

Model CS700L Tipping Bucket Rain Gauge for intense rainfall events.

Hydrological Services
The CS700 rain gage is manufactured by Hydrological Services Pty. Ltd.'s (ModelTB-3). Rain funnels into a tipping bucket mechanism that tips when 0.01 inches (0.254 mm) of rain has been collected. Each tip is marked by a dual reed switch closure that is recorded by a datalogger pulse count channel. After measurement, the water empties through drains in the base of the gage. The CS700's syphoning mechanism causes the rain to flow at a steady rate to the tipping bucket mechanism (regardless of rainfall intensity). Because of this, typical rain bucket errors become constant allowing the calibration process to minimize them. This produces accurate measurements for a range of 0 to 19.69" (500mm)/hr enabling the CS700 to record intense rainfall events.
Catchment area200 cm2 Catchment
Resolution0.254 mm per tip
Accuracy2% @ 100mm/hr
OutputPulse (magnetic reed switch)
Operating tempn/a
Measuring Range0-500 mm/hr
CS700L photo 1
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CS700L photo 3

Model RK400-01 Tipping Bucket Rainfall Sensor

Rika Sensors
The RK400-01 Tipping Bucket Rainfall Sensor is an instrument for testing rainfall in the nature. In order to meet the requirement of information transmission, processing, recording and display, the amount of rainfall is converted to pulse output. It can be widely used in weather stations, hydrometric stations, agriculture & forestry, defense & field monitoring stations. It can provide the original data for flood-prevention, water-supply system, and reservoir water management in plant.
Rainfall collectorDiameter: φ200mm, height: 350mm
Measured rainfall intensityMax: 4mm/min
Allow rainfall intensityMax: 10mm/min
Resolution0.1mm, 0.2mm
Accuracy (2mm/min)±4%
Maximum load voltage30VDC (pulse output)
Maximum load current20mA (pulse output)
OutputReed switch pulses, RS485 (12-24VDC supply)
Operating temperature (no freeze)-20 to +80°C
Main materialCollector: 304SS, tipping bucket: ABS
Tipping bucketSingle
Heating (optional)Heating power: approx. 350W
Heating voltage: 220VAC
Collector filterRemovable filter (prevent leaves and sundries) optional
Weight (unpacked)3.5kg
RK400-01 photo 1
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RK400-01 photo 3

Model RK400-13 Radar Rainfall Sensor

Rika Sensors
RK400-13 is a sensor that uses radar wave technology to detect rainfall. It can distinguish the types and intensity of rain, snow and hail. Compared with the traditional mechanical rain gauge, the detection is more sensitive and fast, and there is no need to worry about the influence of the cover of leaves and other objects on the surface of the detector for rainfall detection, and no need for heating device to prevent icing. There are no moving parts inside the product, which is maintenance-free, small in size and low in energy consumption.
Measurement objectrain, snow, hail
Measured rainfall intensity0-200mm/h (rainfall)
Sample interval1s
Resolution0.1mm
Precipitation diameter0.5-5.0mm
Accuracy (2mm/min)±5% (@Wind speed <5m/s)
Power consumption<2W
Supply7-24VDC
OutputRS485, RS232, SDI-12 optional
ProtocolModbus-RTU (default), NMEA-0183, SDI-12
Operating temperature-30 to +70°C
Main materialAluminum Alloy + ABS/ABS
Weight (unpacked)0.65kg/0.38kg
RK400-13 photo 1
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Model 237 Wetness Sensing Grid.

Campbell Scientific
The 237 Leaf Wetness Sensor is designed to emulate the surface area of a leaf. It Indicates periods of leaf wetness after rainfall dew or spray.
Main featuresThe sensor is a circuit board with interlacing gold-plated fingers.
Condensation on the sensor lowers the resistance between the fingers, which is measured by the datalogger.
Droplets must touch two fingers simultaneously to change the sensor resistance.
For this reason, this type of sensor is often coated with flat latex paint to spread the water droplets.
The color and type of paint affect sensor performance.
237 photo