Dwyer IEFS User Manual
Page 3
IEFS-0XX INSTALLATION
Fitting Installation.
IEFS-0XX sensors come with a 1-1/2” male NPT pipe
thread adapter fitting. Any fitting that provides the matching NPT female
thread may be used. Installation procedure compensates for fitting height
differences. Cut a minimum 1-3/4” hole in the pipe. If possible, measure
the wall thickness and write it down for use in depth setting. Then install
the threaded fitting (saddle, weldolet, etc.) on the pipe.
Meter Installation.
Loosen the compression nut so that the adapter slides
freely. Pull the meter fully upward and finger-tighten the compression
nut. Using a thread sealant, install the adapter in the pipe fitting. Do
not overtighten. Loosen the compression nut, and lower the meter to
the appropriate depth setting (see diagram and instructions that follow).
Be sure flow is in the direction of the arrow on the housing. Tighten
compression nut fully.
IEFS-1 INSTALLATION
‘Hot-tap’ IEFS-1XX meters are designed so they can be installed and
serviced without depressurizing the pipe.
Fitting Installation.
The IEFS-1XX sensors have a 2” NPT thread for
compatibility with the 2” isolation valve. Any fitting that provides matching
NPT female thread may be used. The installation procedure compensates
for differences in fitting height.
If initial installation is performed on an unpressurized pipe, cut a
minimum 1-3/4” hole in the pipe. If possible, measure the wall thickness
and write it down for use in depth setting. Then install the threaded fitting
(saddle, weldolet, etc.) on the pipe.
If it is necessary to do the initial installation under pressure, any standard
hot tap drilling machine with 2” NPT adapter, such as a Transmate or a
Mueller, can be used. Ordinarily, it is not necessary to use an installation
tool, due to the small diameter tube the meter can be installed by hand
in exception for applications with higher pipe pressures.
Meter Installation.
Remove the sensor unit from the valve assembly.
Using a thread sealant, install the valve assembly on the pipe fitting. If
the initial installation is a pressure (“hot-tap”), remove the 1-1/2” x 2”
adapter bushing at the back of the valve. Thread the tapping machine
on, open the valve, and tap using a minimum of 1-3/4” or maximum
1-7/8” cutter. After retracting the machine and closing the valve, reinstall
the flow sensor. When the sensor is secure, open the valve and adjust
depth setting (see diagram and instructions that follow). Be sure flow is
in the direction of the arrow on the housing. Tighten locking collar and
compression nut fully.
Compression nut
Adapter fitting
with
standard NPT
threads
Compression nut
2” adapter removes
to mount hot-tap
machine
Full-port 2” ball
valve allows sensor
removal
Standard 2”
NPT threads
IEFS-1XX Sensor
Removal
INSTALLATION
Piping.
For best results, the IEFS sensor should be
installed with at least ten diameters of straight pipe
upstream and five downstream. Certain extreme situations
such as partially-opened valves are particularly difficult and
may require more straight diameters upstream (see page 6
for straight pipe recommendations).
Immersion.
The IEFS Series sensors are not designed for
underwater operation. Even occasional immersion can
cause damage. If occasional immersion is possible, such
as when a vault floods, then the -IMM option, (immersion)
is recomended.
Chemical Injection or Fertigation.
When any magmeter, by
any manufacturer, is used in a chemical injection applica-
tion (including fertigation), the chemical line must be placed
downstream of the magmeter OR far enough upstream for
complete mixing to occur before the fluid reaches the meter.
When unmixed chemical or fertilizer alternates with water
passing through the meter, the rapid changes in conductivity
may cause sudden spikes and drops in the meter’s reading,
resulting in inaccurate measurement. The magmeter will
restabilize, however, with a steady flow of fluid of uniform
conductivity.
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Caution:
These flow sensors are not rec-
ommended for installation downstream
of a boiler feedwater pump where instal-
lation fault may expose the flow sensor
to boiler pressure and temperature. Maximum
recommended temperature is 200°F.
INSTALLATION
DISTORTED FLOWS
FLOW
POSITIONING ThE METER
Vertical flow in upward direction is the preferred installation
orientation, since it improves low-flow performance and avoids
problems with trapped air and sediment. Bottom, top, and
vertical pipe installations are all acceptable if required by
the piping layout.
Fair
(Unacceptable position
if air is present)
best
Position
Fair
(Unacceptable position if fluid
contains sediment)
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Faster Flow
Causes Meter
To Read high
10X
5X
Distorted
Flow Profile
Locking collar
Caution:
In chemical injection or fertiga-
tion applications, install chemical line
downstream of magmeter, or far enough
upstream to allow complete mixing of
fluids before the meter.