CS701-L HyQuest Solutions TB4 Rain Gauge
Designed for Reliability
Based on Bureau of Meteorology Specifications
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications


The CS701-L is recognised as the world standard for measuring rainfall and precipitation in remote and unattended locations. With a synthetic ceramic coated brass bucket and a plastic base. The integrated syphon mechanism delivers high levels of accuracy across a broad range of rainfall intensities. It measures precipitation in 0.2 mm increments. The CS701 is ideal for locations where intense rainfall events may occur. This tipping bucket is compatible with all Campbell Scientific dataloggers, and is used in environmental monitoring applications.

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Benefits and Features

  • World standard 200mm diameter catch
  • Accuracy not affected by rainfall intensity
  • Long term stable calibration
  • Minimal maintenance required
  • Used world-wide in a range of hostile environments


Detailed Description

The CS701-L funnels precipitation into a bucket mechanism that tips when filled to its calibrated level. Each tip is marked by a dual reed switch closure that is recorded by a datalogger pulse count channel. After measurement, the water drains through two orifices (accepts 12 mm tubing) in the base, allowing the measured water to be collected in a separate container.

The CS701-L contains an internal siphon mechanism that causes rain to flow at a steady rate to the tipping bucket mechanism (regardless of intensity). The siphon allows the sensor to make accurate measurements over a range of 0 to 700 mm per hour.


  • Sensor Type: Tipping bucket with siphon
  • Accuracy:
    ±2% @ 0 to 250 mm/hr;
    ±3% @ 250 to 500 mm/hr;
  • Resolution: 0.2 mm
  • Measurement Range: 0 to 700 mm/hr 
  • Temperature Range: -20° to 70°C
  • Humidity: 0 to 100%
  • Orifice Diameter: 20 cm
  • Drain Tube Size: Both filters accept 12 mm inner diameter tubing
  • Cable: Two-conductor shielded



The base of the gage is supported by three legs. A CM240 Leveling Base and Mount or a user-supplied baseplate with leveling capability is recommended. The CM240 may be attached to a CM300-series mounting pole, or to a user-supplied 1.5 IPS (1.9-inch outer diameter, unthreaded) pipe. A concrete pad is recommended.

Wind Screen

Campbell Scientific offers the 260-953 Wind Screen to help minimize the affect of wind on the rain measurements. This wind screen consists of 32 leaves that hang freely and swing as the wind moves past them.

Datalogger Considerations

Each tip of the CS701 is marked by a dual reed switch closure that is recorded by a datalogger pulse count channel.

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