Dwyer F7-MLK User Manual
BULLETIN E-81-MLK
®
Model F7-MLK Multi-Level Switch Kit
Specifications - Installation and Operating Instructions
4.000
[102]
GENERAL
The F7-MLK Multi-Level Switch Kit contains all the components necessary for the design and fabrication of a 1 or 2 station level switch for
pipe plug mounting. User can customize stem length (max 36″), actuation point, distance between floats, and lead wire lengths. The switch
kit is ideal for general purpose, low specific gravity, and gas and oil
applications. Model F7-MLK includes two level stations with BunaN floats (switch, tube, and float), two brass extension tubes 12″ length,
four brass tube unions, one end fitting, and one mounting plug.
ASSEMBLY
1. Lay out the components required for the desired configuration of one or two level stations. A typical configuration
is shown in figure 1.
2. Cut the tubes to the desired legnth. DO NOT CUT THE
SWITCH CAPSULES (short tubes with wires).
3. Clean and smooth all sharp edges on the ends of the cut
tubes to avoid damaging the wires.
4. Make a trial assembly of the switch, including the floats,
to determine taht the assembly is correct for the application. Be sure the tube and switch capsules are inserted fully
into the shoulder of the fittings. Pass the lower switch capsule wire through the upper capsule feedthrough tube. DO
NOT TIGHTEN THE UNIONS AND THE END CAP UNTIL
YOU ARE SURE THE SWITCH IS CORRECT!.
5. To set switch operation for Buna-N floats:
NC-(dry position - open on fluid rise) three magnet
holes on float should face pipe plug.
NO-reverse float
To set operation for stainless steel floats:
NC-(dry position - open on fluid rise) round witness
mark in float should be away from pipe plug.
NO-reverse float
.500
[12.7]
C
.875
.500
[22.2]
[12.7]
4 TUBE
UNIONS
1/2" NPT
2" NPT PIPE
7.991
MOUNTING
[201]
1 FITTING
ASSEMBLY
.500
[12.7]
2.500
[63.5]
.875
[22.2]
1.128
[28.7]
Ø1.250
[31.8]
1.916
[48.7]
1.965
[49.9]
.875
[22.2]
2 BUNA-N
FLOATS
1 TUBE END
FITTING
2 EXTENSION
TUBES
2 SWITCHES
12.000
[305]
.500
[12.7]
10.905
[277]
9.220
[234]
PHYSICAL DATA
Electrical Rating: 60 Watts: 0.4A @ 220VAC, 0.5A @ 110VAC, 0.2A @
120VDC, 0.5A @ 24VDC.
Maximum Temperature: 221°F (105°C).
Maximum Pressure: 150 psig (10 bar).
Material (Float/Stem): Buna-N/Brass.
Minimum Specific Gravity: 0.45.
Tube/Fitting Size: 2″ O.D.
Stem Length: 36″ (91cm) maximum.
Mounting Connection: 2″ NPT(M) pipe plug.
Mounting: Up to 30° angle from vertical.
Wire Leads: 22 AWG ⫻ 72″ (183 cm).
Weight: 3.5 lbs (1.6 kg).
6. Test electrical operation with a continuity meter..
7. When the switch is completely set up as desired, tighten
all fittings 1-3/4 turns beyond finger tight using two
wrenches.
8. Use proper thread sealant on the pipe threads when
installing the switch in the tank.
WARNINGS
DO NOT CUT OR MODIFY THE SWITCH CAPSULES
(SHORT TUBE WITH WIRES) IN ANY WAY, EXCEPT TO
CUT THE WIRES TO LENGTH AFTER ASSEMBLY IS COMPLETE.
DO NOT EXCEED PRESSURE AND TEMPERATURE RATINGS.
DO NOT EXCEED CURRENT AND VOLTAGE READINGS.
BE SURE ALL FITTINGS ARE ASSEMBLED AND TIGHTENED CORRECTLY
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone 219/879-8000 www.dwyer-inst.com
Fax 219/872-9057 e-mail: info@dwyer-inst.com
Lit-by-Fax: 888/891-4963
INSERTION
DEPTH
0.88" (22)
LEADS FROM
CAPSULES
L1 & L2
SWITCH CAPSULE
(DO NOT CUT)
TUBE
(CUT TO WITHIN
2.46" OF ACTUATION
POINT)
UNION
TUBE END
L1
2.46"
(55)
ACTUATION
POINT
L2
L1
ACTUATION
POINT
PIPE
PLUG
UNION
FLOAT
NORMALLY
OPEN POSITION
FLOAT
LEADS
FROM L2
2.46"
(55)
TUBE END
UNION
TUBE
(CUT TO WITHIN
2.46" OF ACTUATION
POINT)
Typical Switch Configuration
Current and Voltage Ratings: These ratings are for resistive loads only. For inductive loads, maximum life will be
achieved if appropriate arc suppression is used.
Maximum Voltage ratings: SPST Switches-220VAC.
TUBE
SWITCH
CAPSULE
ACTUATION
POINT
FLOAT
NORMALLY
CLOSED POSITION
END CAP
Watts Voltage Current Amps.
(Resistive)
220AC 0.4
60
110AC 0.5
120DC 0.2
24DC 0.5
©Copyright 1998 Dwyer Instruments, Inc.
Printed in U.S.A. 3/98 FR R1-443039-00
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone 219/879-8000 www.dwyer-inst.com
Fax 219/872-9057 e-mail: info@dwyer-inst.com
Lit-by-Fax: 888/891-4963
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