- 4 - REGAL RH20 Handheld Ultrasonic Flowmeter
1. Introduction
§1.1 Preface
A member of the Regal Series, the RH20 Handheld Ultrasonic Flowmeter is the first member of the
3rd generation ultrasonic flow meters from Spire Metering. It is carefully designed for portability
and ease of use while still maintaining the capability of a full-size flowmeter.
The RH20 is based on clamp-on transit-time flow measurement principle. It measures the flow rate
of liquid in a pipe from outside of the pipe by using a pair of ultrasonic transducers. In general, the
liquid should be full in the pipe, and should contain very little particles or bubbles. Examples of
applicable liquids are: water (hot water, chill water, city water, sea water, etc.); sewage; oil (crude
oil, lubricating oil, diesel oil, fuel oil, etc.); chemicals (alcohol, acids, etc.); waste; beverage and
liquid food; solvents and other liquids.
Due to the nature of the clamp-on technique, the transducer installation is simple and no special
skills or tools are required. Besides, there is no pressure drop, no moving parts, no leaks and no
contamination.
The RH20 utilizes our proprietary technologies such as advanced signal processing, low-voltage
transmitting, small signal receiving with self-adaptation, etc. It also incorporates the latest surface-
mounting semiconductors and mini PCB design techniques. The built-in rechargeable Ni-H battery
can work continuously for more than 8 hours without recharge.
The RH20 also has a built-in data-logger, which allows storage of 2,000 lines of data. The stored
information can be downloaded to a PC through its RS232 connection port with Spire Metering’s
StufManagerTM PC software or Windows HyperTerminal software. The RH20 also provides digital
output such as frequency output and pulsed totalizer output.
§1.2 Features
*±0.5%oflinearity
* Accuracy: ±1% of reading in velocity, plus ±0.03ft/s (10mm/s)
* Bi-directional measurement
* 4 flow totalizers
* Proprietary low-voltage transmission technology
* Wide pipe size range (1” ~ 120”)
* Built-in data-logger
* Clamp-on transducer. Easy to install and to maintain
* Optional flow-cell transducer or insertion transducer available for excellent long-term
stability and high accuracy demand
* Lightweight, portable (Main unit 1.2lbs)
* USB interface to computer for easy data download
* StufManagerTM PC software
