TB4-L Rain Gage with 8 in. Orifice

Overview

The TB4, manufactured by HS Hyquest Solutions, is a high-end tipping bucket rain gage that has an 8 in. orifice and measures rainfall in 0.01 in. increments. It 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

  • Accuracy is ±3 percent at high precipitation rates of 500 mm/hr
  • More accurate measurement of high-intensity precipitation
  • High precision—tips at 0.01-in. increments
  • Compatible with most Campbell Scientific data loggers

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Detailed Description

The TB4 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 data logger 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 TB4 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 50 cm per hour.

 

Specifications

Sensor Type Tipping bucket with siphon and dual reed switch
Measurement Uncertainty
  • ±2% @ < 250 mm/h (9.8 in./h)
  • ±3% @ 250 to 500 mm/h (9.8 to 19.7 in./h)
Measurement Uncertainty 700 mm/h (27.6 in./h) maximum rate per hour
Rainfall per Tip 0.254 mm (0.01 in.)
Measurement Range 0 to 700 mm/h (0 to 27.6 in./h)
Operating Temperature Range 0° to 70°C
Humidity Range 0 to 100%
Cable Type Two-conductor shielded
Drain Tube Size Both filters accept 12 mm (0.47 in.) ID tubing.
Orifice Diameter 20 cm (7.9 in.)
Height 33 cm (13 in.)
Weight 2 kg (4.4 lb) with 7.62 m (25 ft) signal cable

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR1000X
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR300
CR3000 (retired)
CR310
CR350
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR6
CR800
CR850
CR9000 (retired)
CR9000X (retired)

Additional Compatibility Information

Mounting

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 (see Ordering Information). 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.