Rain Gauge/Tip Bucket, 8", Siphon

The TR-525-S-U is a remote rain gauge that measures liquid precipitation. It utilizes a unique siphoning mechanism that allows an extended range of accuracy. This system allows control of the “flow rate” of accumulated precipitation. This metering geometry assures higher levels in both accuracy and repeatability during periods of extremely heavy rainfall.


The TR-525-S-U is a freestanding receptacle with an open top, called the collector, which allows rainfall to enter. The collector is specially designed to prevent splash-out and overflow, two possible causes for loss of accuracy during extremely heavy rainfall events. Collected water is siphoned into a mechanical device, the tipping bucket style rain gauge. The tipping bucket then incrementally measures the rainfall accumulation and causes a momentary closure of a switch. As water is collected, the tipping bucket fills to the point that it tips over. This action empties the bucket in preparation for additional measurement. Water discharged by the tipping bucket passes out of the rain gauge with no need for emptying.

Availability: In stock

$589.00
Bulk Discounts Available
  • Buy 5 for $559.55 each and save 5%
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Rain Gauge/Tip Bucket, 8", Siphon

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Additional Information

Resolution 0.01" English; 0.2 mm (optional)
Accuracy 0-10 in. (254 mm) per hour; +/-2%ׅׅ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍ ‍‍    10-20 in. (509 mm) per hour; +/-3%
Siphon starting threshold <0.01" (<0.254 mm)
Collector Diameter 8.00" (203 mm) with knife-edge
Funnel Depth >6.5" (165 mm)
Splash out Protection >4" (50 mm)
Operating Temp 32 to 158°F (0 to 50°C)
Storage Temp -40 to 185°F (-40 to 70°C)
Humidity Limits -40 to -160°F (-40 to 70°C)
Weight 2 lbs.
Height 11.5" (292 mm)
Cable 25', 24 Gauge 2 Conductor
Switch Momentary potted reed switch
Switch Rating 30 VDC @ 2A, 115 VAC @ 1A
Switch Closure Time 135 ms
Bounce Setting Time 0.75 ms
Pivot Ground bronze pivots with hardened stainless steel shaft
Bucket Black ABS injection molded
Level Integral Bubble Level
Warranty 3 years

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