Xylem EX80-Series INSERTION MAGMETERS - Manual (Page 4)

Fitting Installation. EX80-Series meters require special fit-
tings that ensure that the flow sensor is installed to the correct
depth. The fitting must be installed in the pipeline before the
meter can be installed. For best results, install with at least
ten diameters of straight pipe upstream of the meter and
five diameters downstream (or more under specific adverse
circumstances). See diagrams, next page.
If there is not enough straight run to smooth out the turbu-
lence caused by valves, fittings, and changes in direction,
some decrease in accuracy may result. This does not mean
that the flow meter’s reading is meaningless, however. In
some applications (control systems, valve operation, chemi-
cal addition), a repeatable reading may be more important
than a highly accurate one.
Although EX80-Series PVC meter tees are supplied with some
straight pipe, additional straight pipe should be added to
meet straight pipe recommendations. It is not advisable to
connect a flow-disturbing device (e.g. valve or elbow) directly
to the end of these fittings.
A PVC fitting is usually installed by solvent welding. The stain-
less steel and brass meter fittings have female pipe threads,
requiring the appropriate male threaded fittings. Saddleor
weld fittings (3” and above) require a hole to be cut in the
pipe. Recommended hole size is 1-3/4”.
Chemical Injection or Fertigation. When any magmeter, by
any manufacturer, is used in a chemical injection application
(including fertigation), the chemical injection point 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 con-
ductivity 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.
INSTALLATION
Caution: Never remove the U-clip retainer
when the pipe is under pressure. Always
remove pressure from the pipe before you
attempt to remove the meter. Removal under
pressure may result in damage or serious injury.
Page 2
5X
DISTORTED FLOWS
Distorted
Flow Profile
Faster Flow
Causes Meter
To Read High
10X
Okay position if there is no
air in the pipe
POSITIONING THE METER
BEST POSITIONS
Caution: These flow sensors are not recom-
mended for installation downstream of a
boiler feedwater pump where installation
fault may expose the flow sensor to boiler
pressure and temperature. Maximum recommended
temperature is 130°F (Plastic), 200°F (Metal).
Meter Installation. After the meter fitting is installed in the
pipeline, the meter can be installed in the fitting. After noting
the direction of the flow arrow, press the meter into the fitting
as far as it will go. Retain the meter in place by inserting the
U-clip. The pin can be installed from either side. It may be
necessary to rotate the probe back and forth slightly to start
the pin into the slots on the probe. Slide the pin in as far as
it will go.
Caution: In chemical injection or fertiga-
tion applications, install chemical injection
point downstream of magmeter, or far
enough upstream to allow complete mix-
ing of fluids before the meter.