King Instrument 7520, 7530 Operating Manual
7520 - 7530 Series
FLOW METER LIMITED WARRANTY
Meters are warranted against defects in materials and workmanship to the original user for a period of thirteen (13)
months from the date of factory shipment, provided the meter is installed, operated and maintained in accordance
with King Instrument Company’s instructions and recommendations.
This warranty does not apply if failure is caused or contributed to by any of the following: improper handling,
improper storage, abuse, unsuitable application of the product, lack of reasonable and necessary maintenance,
use exceeding suggested pressure and temperature maximums, improper packaging for return, or repairs made or
attempted to be made by anyone other than King Instrument Company, Inc.
KING INSTRUMENT COMPANY, INC. MAKES NO WARRANTY AS TO THE FITNESS OF ITS PRODUCTS
FOR SPECIFIC APPLICATIONS.
This warranty is valid for the original end-user only and does not apply to products that have
been damaged or modied. This warranty is non-transferrable and is limited to replacement
or repair. The liability of King Instrument Company arising out of its supply of the products, or
their use, shall not in any case exceed the cost of correcting defects in the products as set forth
above.
THIS WARRANTY IS A LIMITED WARRANTY AND SHALL BE IN LIEU OF ANY OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THERE ARE NO OTHER
WARRANTIES WHICH EXIST BEYOND THE DESCRIPTION OR FACE HEREOF.
IN NO EVENT SHALL KING INSTRUMENT COMPANY BE LIABLE FOR LOSS OF PROFITS,
INDIRECT, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Products should be returned, prepaid, to King Instrument Company, Inc. with proof of
purchase. Call factory for Return Merchandise Authorization (RMA) number and return
instructions.
THIS IS IMPORTANT INFORMATION.
READ IT CAREFULLY BEFORE BEGINNING WORK.
Installation Instructions
1) Inspect meter for damage that may have occurred during shipping.
Report any damage to the container to the freight carrier immediately.
2) Make sure your pressure, temperature, uid and other requirements
are compatible with the meter.
3) Select a suitable location for installation to prevent excess stress on
the meter which may result from:
a) Misaligned pipe.
b) The weight of related plumbing.
c) “Water Hammer” which is most likely to occur when ow is
suddenly stopped as with quick closing solenoid operated
valves. (If necessary, a surge chamber should be installed. This
will also be useful in pressure start-up situations.)
d) Thermal expansion of liquid in a stagnated or valve isolated
system.
e) Instantaneous pressurization which will stress the meter and
could result in tube failure.
NOTE: In closed thermal transfer or cooling systems, install the meter
in the cool side of the line to minimize meter expansion and contraction and possible uid leaks at the threaded connections.
4) Handle the meter carefully during installation.
a) Use an appropriate amount of teon tape on external pipe
threads before making connections. Do not use paste or stick
type thread sealing products.
b) Extreme caution should be exercised when using PVC solvent
cement around Acrylic. Solvents can cause acrylic to
stress crack.
c) Over tightening of plastic connections may result in tting
damage.
5) Install the meter vertically with the inlet port at the bottom.
6) Meters with stainless steel ttings will support several feet of pipe
as long as signicant vibration or stress resulting from misaligned pipe
are not factors.
7) Meters with plastic ttings must be installed so that ttings are not
made to support any part of the associated plumbing. In addition,
meter frame should be fastened to bulkhead, panel or column.
8) Meters used in gas service should have suitable valves plumbed in
at the inlet and outlet of the meter. These valves should be no more
than 1-1/2 pipe diameters from the meter ports. The valve at the
outlet should be used to create back pressure as required to prevent
oat bounce. It should be set initially and then left alone. The inlet
valve should be used for throttling purposes. Depending on the
installation, valves may not be essential, but they are most useful in
many installations. Remember: To get a correct reading of ow in gas
service, it is necessary to know the pressure right at the outlet of the
meter (before the valve).
9) Pressure and temperature maximums must never be exceeded.
When it comes to ow...we’re instrumental.
(714) 891-0008 • www.kinginstrumentco.com
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7520 - 7530 Series
Pressure and temperature ratings are based on a study of the engineering data
for particular materials used in construction and on the design of individual
models. This information is supplemented by destructive test results. Meters with
stainless enclosures must never be operated without shields securely in place.
Meters exposed to difficult environments such as those created by certain
chemicals, excessive vibration or other stress inducing factors could fail at or
below the suggested maximums. Never operate meters above pressure and
temperature maximums. It is strongly recommended that all meter installations
utilize an appropriate pressure relief valve and/or rupture disc. The pressure
settings and locations of these devices should be such that meters cannot be
over pressurized. Meter failure could result in damage to equipment and serious
personal injury. Always use suitable safety gear, including OSHA approved eye
protection when working around meters in service. We are happy to pass along
chemical compatibility information that has been published by the manufacturer's
of raw materials used in our products; however, this information should not be
construed as a recommendation made by King Instrument Company, Inc. for a
specific application.
Carefully remove the flowmeter from piping system. Remove the threaded top
plug and withdraw the float from the top. All necessary instrument components
are now fully accessible for cleaning with a bottle brush and appropriate mild
soap solution*. Before the meter is reassembled, inspect all parts for damage.
O-rings should be replaced during meter maintenance and cleaning.
To reassemble, carefully guide the float back into the tube. When installing
float/guide assembly make certain that the end of the guide fully engages the
inlet and/or outlet float stop. Reinstall and tighten fittings in appropriate ports.
Reinstall the instrument into the plumbing system after removing the old teflon
tape (with a wire brush) and replacing with fresh teflon tape.
*Do not use cleaning agents that will damage float, tube or o-rings.
Meters should be cleaned with a mild soap solution. This will be an effective
cleaner of rust stains. Caution must be used so that materials of construction are
not damaged by cleaning solutions. Hard water deposits can be removed with 5%
acetic acid solution (vinegar).
7520 / 7530 meters that require repair should be sent to the factory. Please call
for a Return Merchandise Authorization (RMA) number and return instructions.
-7520 / 7530 meters are not oxygen cleaned. Use with incompatible fluids may
cause o-rings to swell and break.
-O-rings should be replaced if meter is disassembled after it has been in service.
-Extra caution must be exercised when meters are used in high pressure gas
cylinder applications. Pressure regulators should be installed at the cylinder and
at the inlet of the meter.
-Serious property damage and great personal injury could occur as the result of a
meter misused or used in an unsuitable application.
a) Misaligned pipe.
EPR
225 °F
Buna-N
Viton
Kalrez
275 °F
350 °F
400 °F
Air
130° F 150 psig
100° F 100 psig
O-Ring Temperature
33° F - 125° F
O-Ring Material
PressureTemperature Maximum
Temperature
Meters are not specifically recommended for service other than
water or air. The user must determine meter suitability for use
with other fluids.
Installation Instructions
Maximum Non-Shock Pressure and Temperature
Fluid Temperature Pressure
Liquid 130° F 125 psig
Gas 100° F 100 psig
Ambient Temp. 33° F -125° F
CAUTION
• 7520 / 7530 meters are not oxygen cleaned. Use with incompatible
uids may cause o-rings to swell and break.
• O-rings should be replaced if meter is disassembled after it has
been in service.
• Extra caution must be exercised when meters are used in high
pressure gas cylinder applications. Pressure regulators should be
installed at the cylinder and at the inlet of the meter.
• Serious property damage and great personal injury could occur as
the result of a meter misused or used in an unsuitable application.
CLEANING
Carefully remove the owmeter from piping system. Remove the
threaded outlet tting and withdraw the oat from the top. All necessary instrument components are now fully accessible for cleaning with
a bottle brush and appropriate mild soap solution*. Before the meter is
reassembled, inspect all parts for damage. O-rings should be replaced
during meter maintenance and cleaning.
To reassemble, carefully guide the oat back into the tube. When
installing oat/guide assembly make certain that the end of the guide
fully engages the inlet and/or outlet oat stop. Reinstall and tighten
ttings in appropriate ports. Reinstall the instrument into the plumbing system after removing the old teon tape (with a wire brush) and
replacing with fresh teon tape.
*Do not use cleaning agents that will damage oat, tube or o-rings.
Meters should be cleaned with a mild soap solution. This will be an
eective cleaner of rust stains. Caution must be used so that materials
of construction are not damaged by cleaning solutions. Hard water
deposits can be removed with 5% acetic acid solution (vinegar).
REPAIR
7520 / 7530 meters that require repair should be sent to the factory.
Please call for a Return Merchandise Authorization (RMA) number and
return instructions.
WARNING:
Pressure and temperature ratings are based on a study of the engineering data for particular materials used in construction and on the
design of individual models. This information is supplemented by
destructive test results. Meters with stainless enclosures must never be
operated without shields securely in place. Meters exposed to dicult
environments such as those created by certain chemicals, excessive
vibration or other stress inducing factors could fail at or below the
suggested maximums. Never operate meters above pressure and
temperature maximums. It is strongly recommended that all meter
installations utilize an appropriate pressure relief valve and/or rupture
disc. The pressure settings and locations of these devices should be
such that meters cannot be over pressurized. Meter failure could
result in damage to equipment and serious personal injury. Always
use suitable safety gear, including OSHA approved eye protection
when working around meters in service. We are happy to pass along
chemical compatibility information that has been published by the
manufacturer’s of raw materials used in our products; however, this
information should not be construed as a recommendation made by
King Instrument Company, Inc. for a specic application.
FLOAT TYPES AND ORIENTATIONS
BL FlOAT GV FLOAT SL FLOAT
When it comes to ow...we’re instrumental.
(714) 891-0008 • www.kinginstrumentco.com
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