Badger Meter Dynasonics DTTSU Manuale utente

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 uid 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°

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

Piping Congurations and Transducer Positioning

Figure 2 shows the number of pipe diameters required downstream and upstream of the transducers for various

piping configurations.

Flow Flow

Flow

14 5

Flow Flow

Flow

10 5

24 5

10 5

24 5

Figure 2: Piping configuration and transducer positioning

The system will provide repeatable measurements on piping systems that do not meet these pipe diameter requirements, but

the accuracy of the readings may be influenced.

Pre-Installation Requirements

Page 2 March 2021IND-UM-02647-EN-02

INSTALLATION PROCEDURE

All moving parts are already mounted on the rail. One transducer is stationery, one is movable by loosening the thumbscrew

and sliding it along the spacing scale.

The small pipe transducers are adjustable for pipe sizes between 1/2…2 in. (15…50 mm). Do not attempt to mount the

transducers onto a pipe that is either too large or too small for the transducer.

On horizontal pipes, mount the transducers in an orientation such that the cable exits from the side of the pipe. Do not mount

with the cable exiting on either the top or bottom of the pipe. See Figure 1 on page1. On vertical pipes, the orientation

does not matter.

1. Clean the surface of the pipe. If the pipe has external corrosion or dirt, wire brush, sand or grind the mounting location

until it is smooth and clean. Paint and other coatings, if not aked or bubbled, need not be removed. Plastic pipes typically

do not require surface preparation other than soap and water cleaning.

2. Loosen the position adjustment thumbscrew and slide the transducer along the scale to set the distance between the

them. The scale shows the distance in inches. See Figure 3.

3. Tighten the position adjustment thumbscrew hand-tight to lock the transducer in place.

1.02.0 1.5 0.5

Mounting Chain

Transducer Spacing Scale

Mounting Chain

Thumbscrew

Mounting Chain

Thumbscrew

Transducer Position

Adjustment Thumbscrew

(ON OPPOSITE SIDE)

Mounting

Cleat

Mounting

Cleat

Figure 3: Transducer top view

4. Apply contact gel to the underside of the transducers.

Place a single bead of couplant, approximately 1/2 inch (12 mm) thick, on the flat face of the transducers. See Figure 4.

Generally, a silicone-based grease is used as an acoustic couplant, but any good quality grease-like substance that is rated

to not ow at the operating temperature of the pipe is acceptable. For pipe surface temperature over 130° F (55° C), use

high-temperature paste (P.N. D002-2011-012) or non-silicone paste (P.N. D002-2011-009).

½ in.

(12 mm)

Figure 4: Transducer bottom view

5. Wrap the mounting chains around the pipe and secure the chains to their respective mounting cleats. See Figure 5.

Installation Procedure

Page 3March 2021 IND-UM-02647-EN-02

Mounting Cleat

Figure 5: Transducer mounting chain hooked onto mounting cleat

OTE:NThe chains do not need to be taut at this point. Any slack in the chains is removed when the thumbscrews

are adjusted.

1/2 in.

(12 mm)

Mounting

Cleat

Mounting

Cleat

Figure 6: Application of acoustic couplant

6. Finger tighten the position adjustment thumbscrew enough to hold the mounting rail in place, but not so tight that all of

the couplant squeezes out of the gap between the transducer faces and the pipe.

7. Route the transducer cables back to the ow meter location, avoiding high voltage cable trays and conduits.

Transducers, Small Pipe Transit Time Transducers with Rail Mounting (DTTSU)

www.badgermeter.com

Dynasonics is a registered trademark of Badger Meter, Inc. Other trademarks appearing in this document are the property of their respective entities. Due to continuous research,

product improvements and enhancements, Badger Meter reserves the right to change product or system specications without notice, except to the extent an outstanding