7750 Series
Installation Instructions
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.
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 and components.
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.
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.
additionally:
• 7750 Series meters are designed for vertical installation only. (Inlet
at bottom, Outlet at top)
• Do not remove or adjust the screws on the side of the indicator
housing. These screws were positioned during factory calibration
and represent the zero adjustment. If the pointer is set on zero,
proceed with installation. If the pointer is not set at zero, follow
these steps:
1) Remove front cover with gasket from indicator housing.
2) Loosen set screw at the base of the pointer hub.
3) Reposition pointer to zero line.
4) Tighten set screw with a 1/16” allen wrench by holding the
pointer hub and gently tightening the set screws.
5) Replace front cover with gasket on indicator housing.
CAUTION: Zero Is Factory Set When Meter Is Calibrated. Do Not
Loosen Screws That Fasten Indicator Housing To Meter Body. If
Indicator Housing Is Moved, The Meter Will Need To Be Calibrated.
When it comes to ow...we’re instrumental.
(714) 891-0008 • www.kinginstrumentco.com
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7750 Series
Installation Instructions
Max Non-Shock Pressure and Temperature
Temp Stainless Steel Flange Class
°F 150# psig 300# psig 600# psig
200 225 600 1,200
300 200 540 1,100
400 180 515 1,000
Note: The maximum ambient temperature for the indicator housing
is 158°F
**CAUTION: Meters with NPT (threaded) connections can be used in service
up to 1,500 psi and 400° F, but always make certain that materials of
construction (including O-Ring material) are compatible with the uid to be
metered at the desired temperature and pressure.
caution
• Do not loosen nuts that fasten indicator housing to metering tube.
If the relationship of meter tube and indicator housing are changed,
meter must be calibrated.
• Serious property damage and great personal injury could occur as
the result of a meter misused or used in an unsuitable application.
cleaning
Flange Connection: Carefully remove the owmeter from piping
system. Remove the inlet oat stop and outlet oat stop and withdraw
oat from top of meter. 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.
To reassemble, carefully guide the magnetic oat back into the tube.
Reinstall and tighten inlet oat stop and outlet oat stop. Reinstall the
instrument into the plumbing system.
FNPT Connection: Carefully remove the owmeter from piping
system. Remove the inlet oat stop and outlet oat stop by twisting
and withdrawing from the top. Remove the oat from top of meter. 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.
To reassemble, carefully guide the magnetic oat back into the tube.
Reinstall and tighten inlet oat stop and outlet oat stop. Reinstall the
instrument into the plumbing system.
*Do not use cleaning agents that will damage oat or tube.
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
7750 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.
7750 series inductive slot sensor
All 7750 Series owmeters may be tted with one or two inductive slot
sensors. Inductive slot sensors are 2-wire, DC, low current devices and
are designed to be used with a remote barrier / switch isolator capable
of powering the sensor and providing the desired switching option(s).
Barrier / switch isolators are available with 220VAC, 110VAC or 24VDC
supply voltage requirements, contain single pole double throw (SPDT )
relays, and are DIN rail mountable. (Only 24VDC units are actually
powered by the rail.) See barrier / switch isolator specications for
electrical connections and further details.
inductive slot sensor-electrical speciFications
TYPE: Inductive
SUPPLY VOLTAGE: 5-25V DC (Switch Isolator)
OUTPUT: NAMUR
OUTPUT LOAD CURRENT: <= 1mA-Float Present
>= 3mA (15mA Max.)-Float Absent
SWITCHING FREQUENCY: 2kHZ
HOUSING RATING: IP67
WIRING: 2 Conductor, NAMUR
POS=BROWN / NEG=BLUE
TERMINALS: #1=POS / #2=NEG
PEPPERL+FUCHS UL: General Purpose
SENSOR APPROVALS CSA: General Purpose
When it comes to ow...we’re instrumental.
(714) 891-0008 • www.kinginstrumentco.com
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