Badger Meter Dynasonics DTTJ Installation Manual

INTRODUCTION
This document explains how to install transit time ultrasonic
transducers with Easy Rail mounting systems.
The Easy Rail mounting system can be installed on vertical
or horizontal pipes. For horizontal applications, install the
system on the side of the pipe.
PRE-INSTALLATION
REQUIREMENTS
Program the Meter
Before installing the Easy Rail mounting system, 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 Easy Rail
Mounting System
Select a location for the Easy Rail mounting system on a
section of pipe that has at least 10 pipe diameters upstream
of the transducers and 5 pipe diameters downstream. See
"Table 1: Piping configuration and transducer positioning" on
page 2.
For example, if a 3 inch pipe is being measured, the minimum
upstream pipe in front of the mounting rail should be 30 in.
and the minimum downstream pipe behind the transducers
should be at least 15 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.
IND-UM-02650-EN-01 (May 2018)
Transducers
Easy Rail Mounting System (DTTJ/K)
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.
45°
YES
45°
TOP OF
PIPE
Figure 1: Transducer positioning
Installation Guide
45°
YES
45°