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DATA LOGGING RAIN GAUGE 

RG3 and RG3-M 

User’s Manual 

 

 

Table of Contents 

Welcome ............................................................................................. 2

 

Specifications ...................................................................................... 2

 

Functional Overview ........................................................................... 4

 

Accessing the Logger ......................................................................... 4

 

Using the Logger for Temperature Measurement .............................. 5

 

Connecting the Logger to Computer .................................................. 6

 

Logger Triggered Start ....................................................................... 6

 

Internal Events .................................................................................... 7

 

Logger  Operation ................................................................................ 7

 

Data Storage ....................................................................................... 7

 

Protecting the Logger ......................................................................... 7

 

Battery ................................................................................................ 8

 

Mounting the Rain Gauge ................................................................... 9

 

Maintenance ..................................................................................... 11

 

Field Calibration ................................................................................ 11

 

2

 

RG3 and RG3-M Data Logging Rain Gauge User’s Manual

 

Welcome 

Thank you and congratulations on your purchase of a Data Logging Rain Gauge 
from Onset Computer Corporation. With proper care, it will give you years of 
accurate and reliable measurements. Please be sure that you read and understand 
this manual before operating the Rain Gauge.

 

Contents of This Package 

 

Data Logging Rain Gauge, Onset Part No: RG3 or RG3-M 

 

Mounting Accessories: 2 Hose Clamps, 3 Screws 

 

This User’s Manual 

Additional Required Equipment 

 

Optic USB Base Station and Coupler, Onset Part No: BASE-U-1 

 

Onset HOBOware

®

 software version 2.1 or later 

 

WARNING: 

The black-anodized aluminum knife-edged ring is extremely 

sharp and can cause injury if not handled properly. Do not press edge against 
any body parts as severe cuts and bleeding may occur.

 

Specifications 

Rain Gauge 

Maximum Rainfall Rate

 

12.7 cm (5 in.) per hour 

Calibration Accuracy 

±1.0% (up to 2 cm per hour for the RG3-M or up to 1 in. per 
hour for the RG3) 

Resolution

 

0.2 mm (RG3-M) or 0.01 in. (RG3) 

Calibration

 

Requires annual calibration: can be field calibrated or 
returned to the factory for re-calibration 

Operating  
Temperature Range 

0° to +50°C (+32° to +122°F) 

Storage  
Temperature Range 

-20° to +70°C (-4° to +158°F) 

Environmental Rating 

Weatherproof 

Housing 

15.24 cm (6 in.) aluminum bucket 

Tipping Bucket 
Mechanism

 

Stainless steel shaft and bearings 

Dimensions 

25.72 cm height x 15.24 cm diameter (10.125 x 6 in.);  
15.39 cm (6.06 in.) receiving orifice 

Weight 

1.2 Kg (2.5 lbs) 

Part Numbers 

RG3 (0.01 in. per tip) 
RG3-M (0.2 mm per tip) 

 

The CE Marking identifies this product as complying with all 
relevant directives in the European Union (EU). 

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