Seametrics EX80 Series v.1 - Manual (Page 4)

Fitting Installation. EX80 Series meters require spe-
cial fittings. The meter fitting must first be installed in the
pipeline. Straight pipe of at least ten times the diameter
upstream of the meter and five diameters downstream is
strongly recommended in order to achieve proper accu-
racy. These are minimum values. As the diagrams on the
the next page will show, you may need much more straight
run under specific adverse circumstances.
If you can't provide enough 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, how-
ever. In some applications, a repeatable reading may be
more important than a highly accurate one. In applica-
tions where the flow meter is part of a control system,
operating a valve or controlling chemical addition, repeat-
ability of reading is more critical than absolute accuracy.
EX80 Series PVC meter tees are supplied with some up-
stream straight pipe. The length provided may be less
than ten diameters upstream and five downstream. It is
not advisable to connect directly to the end of these
fittings with a flow-disturbing device such as a valve or
elbow. If possible, straight pipe should be added to the
upstream end of these fittings.
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
injur y.
A PVC fitting is usually installed by solvent welding. The
stainless steel and brass meter fittings have female pipe
threads, requiring the appropriate male threaded fittings.
Saddle fittings (size 3" and above) require a hole to be cut
in the pipe. The recommended hole size is 1-3/4".
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
inser ting the u-pin. The pin can be installed from either
side. It may be necessar y to rotate the probe back and
for th slightly to star t the pin into the slots on the probe.
Slide the pin in as far as it will go.
5X
Diameter Minimum
(See Below)
Page 2
DISTORTED FLOWS
Distorted
Flow Profile
Faster Flow
Causes Meter
To Read High
FLOW
10X
Diameter Minimum
(See Below)
Okay position if there is
no air in the pipe
BEST POSITIONS
POSITIONING THE METER
AR
CH
IVE
D
(Includes Dates 6/14/04 to 5/05)