Lake Monitors ClearView+ Flow Meter (Polysulphone) - Manual (Page 4)

Warning and Precautionary Areas
1) The meters are designed to operate in systems that flow in only
one direction: the direction of the arrow on the flow scale.
Attempting operation in the reverse direction may cause damage
to the meter or other system components.
2) The pressure vessel and its associated components are made of
Polycarbonate on the ClearViewH2O ™ meter. Polycarbonate can
be safely cleaned with soap and water. However, many other
cleaning agents can damage Polycarbonate, causing discoloration
or crazing. If you are unsure of your cleaning agent, call the
General Electric Polycarbonate Compatibility Reference Line at
800-845-0600.
3) When installing ClearView ™ meters onto threaded pipe caution
should be taken not to over tighten the pipe connections or intro
duce torque on the main body of the meter. The meter main body
may rupture if over-tightened.
4) The ClearView ™ meter should not be used in systems where the
assembled piping is not supported. Externally applied piping forces
may cause the meter to rupture or malfunction.
5) Operating Temperature: In standard meters, several components
have a maximum temperature rating (see specifications).
6) Operating Pressure: All meters are tested at a burst pressure three
times of operating pressure. Meters should not be used over the
operating pressure rating.
7) Thread seal tape: Caution should be used when using thread seal
tape on pipe thread joints. Leave at least 1/8" (3mm) of pipe
thread exposed from end of pipe when applying tape.
Basic Installation Information
The meters are mounted in-line and are direct reading. The meters
can be mounted in a vertical or horizontal position as long as the fluid
is flowing in the direction of the arrow on the flow scale. No straight
pipe is required before or after the meter. In fact, 90° elbows can be
installed on both ends without any noticeable flow variation. When
installing a meter, apply “Thread Seal Tape” on pipe threads, DO NOT
apply pipe dope or Thread seal paste. If tape is used, be sure to
leave 1/8" (3 mm) of pipe thread exposed on end of pipe. Position fil-
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ter in front of meter and in a location that allows easy access for rou-
tine maintenance. Refer to “Warnings and Precautionary Areas” for
additional information.
INSTALLATION DOS AND DON'TS
To obtain satisfactory operation from a Lake flow meter, the following
points should be considered:
DO:
install a pressure gauge near the inlet of the meter
place throttling valves at the outlet of the meter
use pipe sealer on the connections
install solenoid valves at meter outlet (as far downstream as possible)
mount in any orientation: vertical, horizontal or upside down
DO NOT:
place restrictions between the meter’s pressure gauge meter inlet
use in systems where reverse flow is possible
use pipe dope or thread seal paste on the connections
place meter in non-aligned piping
over-flow the meter by more than 150% of maximum reading
operate at pressures and temperatures greater than specified
OPERATION
Operating Principles
Lake has developed a line of unique flow meters which combine the
simplicity of a sharp-edged orifice disk and a variable area flow meter.
See Figure 2 "Flow Meter Cross Section" below. The meters are
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Figure 2:
Flow Meter Cross Section