Dyacon, Inc.

- Model RGTB-4 - Tipping-Bucket Rain Gauge – Siphon Flow Control

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A chrome-plated tipping bucket collects rain in 0.01? increments. A signal with each tip is sent to attached equipment, such as data loggers or Dyacon Control Modules. RGTB-4 uses a special siphon mechanism to ensure accurate measurements up to 19 in/hr (500 mm/hr).

The RGTB-4 tipping-bucket Rain Gauge offers superior measurement accuracy in high-rate precipitation conditions.

We can’t do everything ourselves and are critical about selecting partners. After reviewing and testing a number of rain gauges, we found the Hydrological Services TB-4. By employing a novel siphon mechanism to regulate the flow into the tipping buckets, RGTB-4 outperforms any gauge we have tested in high-rate conditions.

The Tipping Bucket Rain Gauges RGTB-4 are superior products for the professional user.

Feature Summary

  • Siphon flow control
  • 200 mm orifice
  • Tipping bucket mechanism
  • Integrated leaf filter
  • Machined outlet
  • Easy to service
  • Dual reed switches
  • Varistor protection
  • Encapsulated electronics
  • Discharge collection ports
  • Powder coated aluminum
  • Debris screens

Siphon
Rather than a straight-through funnel typically used on tipping bucket rain gauges, RGTB-4 regulates the flow from the funnel into the tipping buckets, improving accuracy during high-rate precipitation events. The siphon is constructed of machined Delrin and brass.

Upper Construction
The cast aluminum funnel is mounted to a spun aluminum cylinder. All aluminum is powder coated.

The cylinder is mounted to the base using key-hole slots. The cylinder can be removed without fully removing the screws, eliminating lost screw when servicing equipment.

Lower Construction
An ABS injection molded tipping bucket is thick plated with chrome to provide consistent and long-lived performance.

The injection molded base is made of UV-resistant ABS, field proven in desert conditions beyond eight years.

Data Connection
Dyacon replaces the standard Hydrological Services cable with an outdoor rated, jacketed cable.

Electronics
The reed switches, varistors, and connector are encapsulated in pliable RTV preventing cracking from handling and temperature fatigue.

Mounting
RGTB-6 includes an integrated bubble level. A three-point mounting holes can be mounted to any flat surface.

Accessories
Pole mount, bird guard, and calibration device are available.

Measurement

  • Orifice/Collector: 200 mm +/-0.3 mm (7.87”)
  • Resolution: One tip (See Resolution Options.)
  • Accuracy: +/-2% at 0 t0 250 mm/hr +/-3% at 250 to 500 mm/hr
  • Resolution Options: 0.5 mm, 0.2 mm, and 0.01”

Environmental

  • Operating Humidity: 0 to 100% rH
  • Operating Temperature: -20°C to 70°C

Electrical

  • Switch Characteristics: Dual, isolated reed switches 500 mA max 12 V max working voltage Varistor protection 0.1 ohms nominal 10x8 to 10x9 MTBF
  • Wire Connection: 4-position screw (slotted) terminal block

Mechanical

  • Upper: Powder coated cast aluminum collector and spun aluminum cylinder. Machined Delrin funnel outlet.
  • Base: UV stabilized black ABS. Thick wall injection molded.
  • Bucket: Injection molded ABS, chrome plated, and balanced
  • Mounting Holes: 3 Holes, 9.4 mm (0.370”) diameter at radius of 117 mm from center. Compatible with 8 mm or 5/16” bolts.
  • Discharge Ports: 2 ports, 12.4 mm OD. Compatible with 12 mm ID tube.
  • Insect and Debris Protection: Collector, discharge ports and venting screens, 1 mm typical pin size, 1.5 mm max.
  • Tipping Pivots: Stainless steel axle and axle rest.
  • Weight: 2 kg
  • Dimensions: 237 mm x 315 mm (9.3” x 12.4”)

Accessories

  • Accessories: Pole mount Bird guard Calibration device.

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