Dwyer instruments, inc – Dwyer DTFA User Manual

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Location
Select a location where the flowmeter can be easily read and where the
temperature will not exceed 200°F (93°C). The mounting surface and
piping to the flowmeter should be free from excessive vibration. If pulsing
flow or vibration causes excessive pointer oscillation, contact factory for
ways to provide additional dampening.

Because the device operates through a magnetic coupling system,
magnetic material near the flow block can affect accuracy. To minimize the
effect of outside interference, keep magnetic materials at least 3 inches
(7.6 cm) away from the unit.

Inlet Piping
It is a good practice to have the inlet port of the flowmeter be as free of
elbows, restrictions and size changes as possible. Inlet piping should be as
close to the flowmeter connection size as possible to avoid possible
turbulence which can occur with drastic size changes. The length of the
inlet piping has very little effect on normal pressure fed flowmeters.

For vacuum service the inlet piping should be as short and open as
possible to allow operation at or near atmospheric pressure, thus
maintaining the accuracy of the device. Note that for vacuum service, any
flow control valve must be installed on the discharge side of the flowmeter.

Outlet Piping
Piping on the outlet port should be at least as large as the flowmeter
connection. For gas and air service flowmeters such as the DTFA, the
piping should be as large and short as possible. This is so pressure within
the device will be at or near atmospheric for maximum accuracy.

Operation
If the media is likely to be dirty, it is recommended that a 50–micron filter is
placed upstream of the inlet port to assure a clean fluid flows medium
through the flowmeter. After all connections are complete, introduce flow as
slowly as possible to avoid damage. No lubrication or periodic servicing is
required. Keep case exterior, including front cover, clean for best visibility.

MAINTENANCE/REPAIR
Upon final installation of the Series DTFA, no routine maintenance is
required. The Series DTFA is not field serviceable and should be returned
if repair is needed. Field repair should not be attempted and may void
warranty.

WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website.
Contact customer service to receive a Return Goods Authorization number
before shipping the product back for repair. Be sure to include a brief
description of the problem plus any additional application notes.

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000

www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Fax: 219/872-9057

e-mail: [email protected]

Printed in U.S.A. 3/12

FR# R4-443968-00 Rev. 2