TB4MM-L Metric Rain Gage with 8 in. Orifice

Overview

The TB4MM, manufactured by HS Hyquest Solutions, is a high-end tipping-bucket rain gage that monitors rainfall in metric rather than US units. It has a 20.3 cm orifice and measures rainfall in 0.2 mm increments. The TB4MM is ideal for locations where intense rainfall events may occur. This tipping bucket is compatible with all Campbell Scientific dataloggers, and it is used in environmental monitoring applications.

Read More

Benefits and Features

  • More accurate measurement of high-intensity precipitation
  • High precision—tips at 0.2-mm increments
  • Compatible with all Campbell Scientific dataloggers (including the CR200(X) series)
  • Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network

Images

Detailed Description

The TB4MM 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 TB4MM 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
Rainfall per Tip 0.2 mm (0.008 in.)
Measurement Range 0 to 700 mm/h (0 to 27.6 in./h)
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
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)
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.

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/
CR850
CR1000 CR3000 CR9000X CR6 Series CR300 Series CR1000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X