Tipping Bucket Rain Gauge – Siphon Control
RGTB‑4TM is a chrome‑plated tipping bucket that collects rain in 0.01″ increments. With each tip, a signal 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‑4TM tipping bucket rain gauge offers superior measurement accuracy in high-rate precipitation conditions.
RGTB‑4 is made by Hydrological Services, a leading manufacturer of rain gauges offering exceptional value and performance. By employing a novel siphon mechanism to regulate the flow into the tipping buckets, the RGTB‑4 tipping bucket rain gauge outperforms any gauge we have tested in high-rate precipitation conditions.
RGTB‑4 is a superior product for the professional user.
- 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
The RGTB‑4TM cast aluminum funnel is mounted to a spun aluminum cylinder. All aluminum is powder coated.
The cylinder is mounted to the base using keyhole slots. The cylinder can be removed without fully removing the screws, minimizing the potential for lost screws while servicing equipment.
The siphon is constructed of machined DelrinTM and brass for consistent performance.
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, which is field proven in desert conditions beyond eight years.
Each bucket tip momentarily closes a reed switch, indicating one incremental step of the gauge resolution.
Dyacon replaces the standard Hydrological Services cable with an outdoor-rated, jacketed cable.
The reed switches, varistors, and connector are encapsulated in pliable RTV to prevent cracking from handling and temperature fatigue.
RGTB‑4 includes an integrated bubble level. Three-point mounting holes can be mounted to any flat surface.
A pole mount, a bird guard, and calibration devices are available.
|Orifice/Collector||200 mm +/- 0.3 mm (7.87 in)|
|Resolution||One tip (see Resolution Options)|
|Accuracy||+/- 2% at 0 mm/hr to 250 mm/hr|
+/- 3% at 250 mm/hr to 500 mm/hr
|Resolution Options||0.5 mm, 0.2 mm, 0.1 mm, 0.01 in|
|Operating Humidity||0% to 100% rH|
|Operating Temperature||-20°C to 70°C|
|Switch Characteristics||Dual, isolated reed switches|
500 mA max
12 V max working voltage
0.1 ohms nominal
10x8 to 10x9 MTBF
|Wire Connection||4-position screw (slotted) terminal block|
|Upper||Powder coated cast aluminum collector, spun aluminum cylinder, machined Delrin funnel outlet|
|Base||UV-stabilized black ABS, thick wall injection molded|
|Bucket||Injection molded ABS, chrome plated, balanced|
|Mounting Holes||3 holes, 9.4 mm (0.370 in) diameter at radius of 117 mm from center, compatible with 8 mm or 5/16 in 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|
|Dimensions||237 mm x 315 mm (9.3 in x 12.4 in)|