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Hydro Services TB3 Tipping Bucket Raingauge

The Hydrological Services Tipping Bucket Raingauge (TB3) is recognised as the standard for measuring rainfall and precipitation in remote and unattended locations. The TB3 raingauge operates on the tipping bucket principle, and has two types of buckets; metal and plastic. A receiver of 200mm diameter collects the rainfall, which is strained by a metal gauze before being passed to the tipping bucket measuring system. Tips of the metal bucket occur with each 0.2mm, 0.5mm, 1.0mm or 0.01 inch of precipitation collected, and tips of the plastic bucket occur with each 0.2mm/p, 0.5mm/p or 0.01”/p of precipitation collected. A reed switch detects these events and produces a momentary contact closure signal for: • logging in our Rainfall Data Logger • transmission by our Radio Reporting Raingauge, or • display on our Rainfall Counter.

Hydrological Services TB3 Tipping Bucket Raingauge

• World standard 200mm catch
• Accuracy not affected by rainfall intensity
• Bucket sizes: 0.01 inch/ 0.2mm/ 0.5mm/ 1.0mm
• Long term stable calibration
• Stainless Steel leaf sieve filter resists blocking
• Optional internal Data Logger, with no external power requirement
• In-build discharge outlets at base for water collection and analysis
• Dual output signal for data collection and transmission
• World class meteorological instrument
• Easy to service with low maintenance requirement

The integrated syphon mechanism delivers high levels of accuracy across a broad range of rainfall intensities. Each unit consists of a collector funnel with stainless steel leaf sieve, an integrated syphon control mechanism, an outer enclosure with quick release fasteners, and base which houses the tipping bucket mechanism.

The unit includes dual output reed switches with varistor protection as well as dual rainfall discharge outlets for water collection and/or analysis. The bucket tips when precipitation of 0.01 inch, 0.2mm, 0.5mm or 1.0mm has been collected. Each tip is marked by a reed switch closure and sorted to a Data Logger and/or used by a Telemetry System. The Tipping Bucket Raingauge can be used in conjunction with Hydrological Services data logger model ML1. The logger is rugged and compact, it records the date and time of occurrence of tips from the raingauge up to 100,000 events with 1 Second Resolution can be stored in the ML1's memory. The data is stored in a flash EPROM.

SPECIFICATIONS
Receiver: 200 mm + 0.3 diameter machined aluminium rim. Powder coated.
Bucket capacity: 0.2 mm, 0.5 mm,1.0 mm, 0.01 inch of rainfall.
Sensitivity: one tip.
Measuring range: 0 to 700 mm / hr.
Calibration accuracy: + 2 % for intensities from 25 to 500 mm/hr. Long term stable calibration.
Humidity: 0 to 100 %
Temperature: - 20 to +70C
Contact system: dual reed switches potted in soft silicon rubber with varister protection.
- Max Capacity: 12 VA (0.5 amp max.)
- Resistance: Initial contact resistance 0.1 OHMS
- M.T.B.F: 108 to 109 Operations
Syphon: 0.4 mm capacity of rainfall - made from brass with a non hydroscopic outer case.
Bucket: two types of buckets, synthetic ceramic coated brass bucket balanced to ±0.05 gms, and injection moulded non hydroscopic plastic
ABS balanced ±0.05 gms.
Base: Die-cast aluminium.
Level: bulls eye level adhered to aluminium base.
Mounting holes: three 10 mm diameter mounting holes with 117 mm p.c.d. cast in feet attached to outside diameter of base.
Drain fittings: to attach 12 mm inside diameter tubing, to catch rainfall after passing through buckets.
Pivots: ground sapphire pivots with hard stainless steel shaft.
Insect covers: stainless steel mesh on all openings to prevent insects and ants entering gauge.
Outer enclosure: keyed to enable the release of the outer enclosure without the need for the removal of the three securing screws.
Height: 342mm
Weight: 3 kg