Badger Meter Dynasonics DTTSU Скачать руководство пользователя страница 1

INTRODUCTION

This document explains how to install small pipe transit time 

ultrasonic transducers with a rail mounting. The transducers 

can be installed vertically or horizontally. For horizontal 

applications, install them on the side of the pipe.
The small pipe transducers have integrated transmitter and 

receiver elements. A spacing slider is provided to adjust the 

required spacing, based on pipe size and mounting method.

PRE-INSTALLATION 

REQUIREMENTS

Program the Meter

Before installing the transducers, you must select the 

optimum transmission mode, enter the site information, and 

enter the fluid and pipe properties into the ultrasonic flow 

meter. For detailed instructions, see the user manual for your 

flow meter.

Select a Pipe Location for the Transducer

Select a location for the transducers on a section of pipe that 

has at least 10 pipe diameters upstream of the transducers 

and 5 pipe diameters downstream. See 

“Figure 2: Piping 

configuration and transducer positioning” on page 2

.

For example, if a 2 in. pipe is being measured, the minimum 

upstream pipe in front of the transducer should be 20 in. 

and the minimum downstream pipe behind the transducer 

should be at least 10 in. 
Pipe runs shorter than the minimums may sometimes be 

used with reduced accuracy. There is no way to determine 

how much accuracy is sacrificed without doing in-field 

testing. For installations where the 10/5 pipe diameters 

rule cannot be followed, divide the total length of available 

straight pipe into thirds and mount the rail with 2/3 of the 

pipe upstream and 1/3 of the pipe downstream. 
A full pipe is absolutely essential for making accurate flow 

measurements. The flow meter cannot determine if the pipe 

is full or not. If the pipe is partially full, the meter will  

over-report the amount of flow by the percentage of the pipe 

that is not filled with liquid or may not detect any flow. 
Install the mounting system in an area where the transducers 

will not be inadvertently bumped or disturbed.

Avoid installations on downward flowing pipes unless 

adequate downstream head pressure is present to overcome 

partial filling of—or cavitation in—the pipe.

YES

45°

45°

45°

45°

YES

TOP OF

PIPE

Figure 1:  Transducer positioning

Transducers

Small Pipe Transit Time Transducers with Rail Mounting (DTTSU)

IND-UM-02647-EN-02 (March 2021)

Installation Guide

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