Dwyer F7-MLK - Manual

Model F7-MLK Multi-Level Switch Kit
BULLETIN E-81-MLK
Specifications - Installation and Operating Instructions
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: [email protected]
Lit-by-Fax: 888/891-4963
GENERAL
The F7-MLK Multi-Level Switch Kit contains all the components nec-
essary for the design and fabrication of a 1 or 2 station level switch for
pipe plug mounting. User can customize stem length (max 36
″), actu-
ation 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 Buna-
N 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 config-
uration 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 applica-
tion. Be sure the tube and switch capsules are inserted fully
into the shoulder of the fittings. Pass the lower switch cap-
sule 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]
12.000
[305]
7.991
[201]
.500
[12.7]
10.905
[277]
9.220
[234]
2" NPT PIPE
MOUNTING
.500
[12.7] .875
[22.2]
1.965
[49.9]
Ø1.250
[31.8]
1.916
[48.7]
.875
[22.2]
1/2" NPT
2.500
[63.5]
.875
[22.2]
.500
[12.7]
4.000
[102] 2 SWITCHES
2 EXTENSION
TUBES
1 FITTING
ASSEMBLY
2 BUNA-N
FLOATS
1 TUBE END
FITTING
4 TUBE
UNIONS
1.128
[28.7]
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
ϫ 72″ (183 cm).
Weight: 3.5 lbs (1.6 kg).
®
C
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 COM-
PLETE.
DO NOT EXCEED PRESSURE AND TEMPERATURE RAT-
INGS.
DO NOT EXCEED CURRENT AND VOLTAGE READINGS.
BE SURE ALL FITTINGS ARE ASSEMBLED AND TIGHT-
ENED CORRECTLY