KING 7310 Series - Manual (Page 4)

(714) 891-0008 • www.kinginstrumentco.com When it comes to flow...we’re instrumental. 4
latching reed switch
All 7310 Series flowmeters may be fitted with one or two latching reed
switches.
The switch assembly is mounted on the meter tube. The switch can be
positioned to trip at any point on the scale.
The switch is a reed type and uses a biasing magnet to give it the
latching feature. The float contains hermetically sealed magnet(s), so
when the float comes in proximity to the switch it closes and remains
closed (latched) when the float moves below the switch it resets itself.
Contact King Instrument Company for multiple switch options.
latching reed switch electrical speciFications
TYPE:
SPDT / Latching
MAXIMUM CONTACT VOLTAGE: 100V DC
MAXIMUM CONTACT CURRENT: 0.20a DC
MAXIMUM CONTACT POWER: 4 Watts DC
BREAKDOWN VOLTAGE: 200V DC
STANDARD PULL-IN RANGE: 15-40 Ampere turns
INITIAL CONTACT RESISTANCE: 0.150 Ohm
connections-intrinsically saFe wiring
SWITCH ISOLATOR 3 CONDUCTOR, 22Awg, 2’ Long
1) White - N.O. switch output 1
2) Red - Common
3) Black - N.C. switch output 2
switch isolator option:
Latching reed switches can be used as stand alone devices, or may be
connected to a switch isolator for intrinsically safe applications. The
purpose of the switch isolator is to supply electrical signals between
safe and hazardous areas in either direction while limiting the amount
of energy that can be transferred even under fault conditions. Switch
isolators are available with 220VAC, 110VAC or 24VDC supply voltage
requirements, contain single pole double throw (SPDT) relays, and are
DIN rail mountable. See switch isolator specifications for electrical con-
nections and further details.
7310 Series
Installation Instructions
7310 series with alarM
parts list:
1. End Fitting Retainer Screw
2. End Fitting Retainer
3. End Fitting
4. Magnetic Float
5. Polysulfone Meter
Tube Assembly
6. Case
7. Shield (Clear)
8. Shield (White)
9. Shield Cover
10. Shield Cover Screw
11. Alarm Switch
12. Alarm Switch Housing
13. Alarm Set Screw O-Ring
14. Alarm Set Screw
15. Alarm Switch Housing Screw
16. Electrical Strain Connector
17. Junction Box O-ring
18. Junction Box With Cover
19. Junction Box
Mounting Screw
ALARM SWITCH
ALARM SWITCH HOUSING
ALARM SET SCREW
ALARM SET SCREW O-RING
ALARM SWITCH HOUSING SCREW
JUNCTION BOX O-RING
ELECTRICAL STRAIN CONNECTOR
JUNCTION BOX WITH COVER
JUNCTION BOX MOUNTING SCREW
1) Inspect meter for damage that may have occurred during shipping. Report any
damage to the container to the freight carrier immediately.
This is important information. Read it carefully before
beginning work.
2) Make sure your pressure, temperature, fluid and other requirements are
compatible with the meter including o-rings.
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 flow 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 fluid
leaks at the threaded connections.
4) Handle the meter carefully during installation.
a) Use an appropriate amount of teflon 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 fittings will support several feet of pipe as long as
significant vibration or stress resulting from misaligned pipe are not factors.
Maximum Non-Shock
Pressure and Temperature O-Ring Temperature
Viton and Kalrez are registered trademarks of DuPont Dow Elastomers.
ADDITIONALLY:
-7310 Series meters are designed for vertical installation only. (Inlet at bottom,
Outlet at top)
Temperature Pressure
Ambient temperature 33° F - 125° F
EPR 225 °F
Buna-N
Viton
Kalrez 275 °F
350 °F
400 °F
150 psig
(41W-72W)
125 psig
(90W-103W)
200 psig
(41W-103W)
130°F
(PVC)
200°F
PVC &
PVDF
316LSS
Maximum
Temperature
O-Ring
Material
END FITTING RETAINER SCREW
END FITTING RETAINER
END FITTING
MAGNETIC FLOAT
POLYSULFONE METER TUBE ASSEMBLY
CASE
SHIELD (CLEAR)
SHIELD (WHITE)
SHIELD COVER
SHIELD COVER SCREW
4X
4X 4X
2X
4X
200°F
(PVDF)