SDI-12 Rain Gauge (H-3401)

Whether you're new at rain measurement technology or know the systems like the back of your hand, you'll love the features of the SDI-12 Tipping Bucket Rain Gauge (H-3401)—such as the built-in microprocessor that automatically corrects errors. It also has a magnetic reed bucket tip sensor and an internal leveling mechanism with a 'bulls-eye' level to ensure high accuracy data. The Rain Gauge is available in .01 in., 0.1 mm and 0.2 mm resolution ranges.

  • Features
  • Specifications

The SDI-12 Tipping Bucket Rain Gauge (H-3401) maintains accuracy at increased rates of rainfall ranging from 635 millimeter (0-25 inches) per hour, has two removable stainless steel funnel screens and a rust-proof enclosure.

  • Two removable stainless steel funnel screens
  • Rust-proof, powder painted aluminum enclosure and cast base
  • Anodized aluminum or stainless steel internal parts
  • Magnetic reed bucket tip sensor
  • Internal leveling mechanism with 'bulls-eye' level
  • SDI-12 output
  • Built-in microprocessor automatically corrects errors
Accuracy ±3%,  0-635 mm/hr (0-25 in per hr)
Resolution 0.01 in, 0.1 mm and 0.2 mm
Mechanical / Power

Funnel Aperture

200 mm W (8 in)


200 mm W x 300 mm L (8 in W x 12 in L)

Weight  3.7 kg (8 lbs)

Top: 20cm W 1/8 mesh (8 in)

Bottom: 3.81 cm T (1 1/2 in) tower 1/16 mesh



Extruded aluminum housing

Powder painted


Spun aluminum

*Includes screened secondary funnel


Cast aluminum

Powder painted


Anodized aluminum internal parts

Stainless steel screws


Tipping bucket with magnetic reed switch sensor


Three anodized aluminum external mounting feet


Three stainless steel leveling screws and bulls eye level, internal

Exit Ports

Two screened drain tube fittings on bottom of casting

Power Requirements Voltage Input

10.0 to 16.0 volts DC

Standby: 180 μA typical


Raining: 2.8 mA for 60 seconds

Communicationg: 6 mA

Connection Screw Clamp, for #12-22 AWG wire

Baud Rate 1200
Protocol SDI-12, version 1.3
Output Voltage Levels

Minimum high level: 3.5 volts

Maximum low level: 0.8 volts

Maximum cable length: 76 m (250 ft)

Response Time 0.1 second measurement
SDI-12 Output Data Parameters 1 - Accumulated rainfall since last measurement
2 - Raw bucket count since last measurement
3 - Total accumulation
4 - Total daily accumulation (today)
5 - Total daily accumulation (yesterday
General Specifications
Electronic Operating Temperature -40 ° to +60 ° C
Storage Temperature -50 ° to +70 ° C
Mechanical Operating Temperature 0 ° to +50 ° C
Warranty The WaterLOG® H-3401 is warranted against defects in materials and workmanship for twenty-four months from date of shipment.

Options & Accessories


Funnel and barrel


Inner funnel fine screen


Debris screen


WaterLOG Stormwater Monitoring

Stormwater Monitoring

Stormwater monitoring doesn't have to be a headache for your organization. With proper site, sensor and equipment selection, you can be up and running within your compliance or organizational strategy in a relatively short time period. Here is some information to help you know what to look for, and some simple steps to get you started.