Dwyer F7 User Manual
PIPE
COUPLING
ELBOW
PIPE
Model F7-SB Shown)
13/16 [20.62]
DIA. MAX.
1-33/64
[38.48]
40∞ MAX
3-15/32 [88/09]
M16X2
S
WITCH CLOSED
POSITION
2-15/64 [56.74]
SWITCH OPEN
POSITION
13/16 [20.62]
MAX
1-19/32
[40.46]
40∞ MAX
SWITCH CLOSED POSITION
3-7/16 [87.29]
2-23/64 [59.92]
2 [50.80]
1/2 NPT
SWITCH OPEN
POSITION
3/4
[19.05]
13/16 MIN
[20.6]
22 AWG
LEAD WIRES
1/2-14 NPT
4
-5/8 MAX
[
116.8]
A
PPROXIMATE
A
CTUATION LEVEL
F
ITTING
C
ENTERLINE
3/32
[2.54]
1-7/32 MAX
[31.0]
1-5/32 MAX
[29.2]
C
B
D
A
EXTERNALLY
WELDED FLANGE
(
imensions, Inches (mm)
D
B) Float
(
A) Stem
odel
M
F7-SB
F7-SS2
F7-PP
F7-BT
F7-MPP
(
L
2.75 (70)
2.06 (52)
2.18 (55)
2.18 (55)
1.63 (41)
ength
Diameter
1.13 (29)
1.0 (25)
1.18 (30)
.18 (30)
1
0.63 (16)
(C) Float
eight
H
.38 (35)
1
.0 (25)
1
1.0 (25)
1.0 (25)
.63 (16)
0
D) Actuation
(
from HEX
1.0 (26)
0.73 (19)
0.69 (18)
.69 (18)
0
0.47 (12)
Bulletin E-75
Series F7 Liquid Level Switches
Specifications - Installation and Operating Instructions
7-HSS
F
F7-HPS-2, EXTERNAL HORIZONTAL MOUNT
7-HPS-2, INTERNAL HORIZONTAL MOUNT
F
WITCH ACTION (Normally open/Normally closed)
S
Vertical Models
Vertical mount models are shipped with normally open switch contacts which close
as the float rises toward the mounting threads. Reverse switch action by removing
the float, rotating it end-for-end and replacing it on the stem.
Horizontal Models
Contacts in horizontal models F7-HPS-1 (internal mount) and F7-HPS-2 (external
mount), are normally open when the float is down and normally closed when the
float is up. Models F7-HPS-1 and -2 also have indicating arrows on the stem end
to confirm float alignment. See installation notes on reverse. Horizontal model F7HSS is in the normally open position when the indicating arrow points up, and
normally closed when the arrow points down.
INSTALLATION
Choose a location away from fill pipes, drains, or other areas where turbulence or
wave motion might occur. Turbulence will cause false actuations and shorten
contact life. Excess contaminants in fluid may inhibit float operation and occasional
wipe-down may be necessary. Care should be taken that switches are always
operated within electrical ratings. Read and understand all safety precautions on
back of this sheet before installing.
MOUNTING
Install vertical mount models in an appropriate 1/8˝ NPT fitting. Vertical models
mount internally, oriented within 30° of vertical, or select optional fittings for
external mounting. Model F7-HPS-1 must be mounted internally, which means the
switch must be secured to the wall of the tank or vessel from the inside. Install
horizontal model F7-HPS-1 in a 5/8˝ (16 mm) hole and secure with nut provided.
Tank wall should not exceed 1/8˝ (3 mm). Model F7-HPS-2 requires a horizontal
1/2˝ NPT(F) fitting and can be fitted to the tank or vessel from the outside. Model
F7-HSS requires a horizontal 1/2˝ NPT(F) fitting and can be mounting from the
inside or outside (internally or externally) of the tank or vessel.
PECIFICATIONS
S
Electrical Rating (Maximum):
F7-SB, SS2: AC: 25 VA, 1A @ 200 V.
DC: 10W, 1A @ 200V.
F7-PP, BT, HSS: AC: 30 VA, 0.14A @ 200V.
DC: 0.28A @ 24 V, 0.07A @ 120V.
F7-MPP: 10 VA, 0.1A @ 120 VAC.
F7-MPP-NO: 50 VA, 0.2A @ 240 VAC.
F7-HPS: 15 VA, 1A @ 220 VAC/DC.
Mounting Connections: 1/8˝ NPT(M) (all vertical mount), 1/2˝ NPT(M) (F7-HPS2, F7-HSS), M16 x 2 (F7-HPS-1).
Wire Leads: F7-SB, SS2, PP, BT: 22 AWG x 18˝ (46 cm); F7-MPP, HSS: 22
AWG x 24˝ (61 cm); F7-HPS: 22 AWG x 39˝ (1m).
Enclosure Rating: F7-HSS: Explosion-proof, Class 1, Groups A, B, C, D; Class
II, Groups E, F, G; Class III.
Weight: F7-SB, 2 oz. (58 g); F7-SS2, 1.2 oz. (34 g); F7-PP, 0.8 oz. (23 g); F7BT, 0.7 oz. (20 g); F7-HPS-1, 1.5 oz. (43 g); F7-HPS-2, 2 oz. (57 g); F7-HSS, 3
oz. (94 g); F7-MPP, 0.8 oz. (23 g).
Min
Model
Material
Float/Stem
Max
Temp.
Max
Press.
S.G.
Approx.
Deadband
Vertical Mount
0.60
0.75
0.60
0.45
0.90
1/16˝
2 mm
1/16˝
2 mm
1/8˝
4 mm
1/8˝
4 mm
1/8˝
4 mm
F7-SB
F7-SS2
F7-PP
F7-BT
F7-MPP
Buna-N & Epoxy/316SS
316SS (CYC)/316SS
Polypropylene &
Epoxy/Polypropylene
Buna-N & Epoxy/PBT*
Polypropylene /
Polypropylene
220°F
105°C
300°F
149°C
220°F
105°C
220°F
105°C
176° F
80° C
150 psig
10 bar
450 psig
31 bar
100 psig
6.89 bar
150 psig
10 bar
100 psig
6.89 bar
Horizontal Mount
3/16˝
F7-HPS
-1, -2
F7-HSS
Polysulfone/
Polysulfone
316SS/316SS
185°F
85°C
392°F
200°C
150 psig
10 bar
300 psig
20.7 bar
0.85
0.60
5 mm
1/8˝
4 mm
*PBT - Polybutylene Terephthalate
Optional Fittings (for Exterior Mounting of Vertical Models)
A-347, 1/8˝ x 1-1/4˝ NPT C.S. Adapter.
A-347-SS, 1/8˝ x 1-1/4˝ NPT 316SS Adapter.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com
A-348, 1/8˝ x 1-1/2˝ NPT C.S. Adapter.
A-348-SS, 1/8˝ x 1-1/2˝ NPT 316SS Adapter.
Phone: 219/879-8000 www.dwyer-inst.com
nstallation Notes - Do not subject
Indicating arrows are
provided on the stem
ends to confirm float
alignment.
Do not exceed 1.5 pounds/
foot (2 n/m) tightening
torque. Excessive torque
may cause premature switch
element or housing failure.
Avoid installations where
wiring entering the device is
submerged or exposed to
excessive amounts of liquid
or humidity condensate.
Gasket seal for internal
mounting units should be preassembled before insertion
through tank wall. Wall thickness should not exceed 1/8"
(3 mm).
When preparing wires for
termination, avoid pulling
against the resin seal or
end plug of the float switch.
Units with tapered pipe
threads should be treated
with Teflon based thread
compound or tape before
insertion in fitting. Sufficient
torque is achieved at handtight plus one half turn.
D
IODE SUPPRESSION
DIODE
INDUCTIVE
LOAD
PIV DIODE > V
REED
SWITCH
REED
SWITCH
USED IN
AC CIRCUITS
VARISTER
VARISTER PROTECTION
INDUCTIVE
L
OAD
R
C SUPPRESSION
R
C
INDUCTIVE PROTECTION FOR
CABLE LENGTH CAPACITANCE
LOAD
REED
SWITCH
Cable Length
over 50 meters
[162.5 ft.]
REED
SWITCH
RESISTOR PROTECTION
FOR CAPACITIVE LOAD
SURGE LIMITER FOR
CAPACITANCE IN SERIES
REED
SWITCH
CURRENT LIMITING RESISTOR
IN SERIES
CURRENT LIMITING RESISTOR
IN PARALLEL
REED
SWITCH
REED
SWITCH
INDUCTIVE
LOAD
REED
SWITCH
SWITCH
[
uf]
10
C
R
10*I
(1+50/E)
SWITCH
2
C
LOAD
SWITCH
SWITCH
LOAD
C
R
L =0.5~ 5 mH
P
+V
R
A
P
L
R
A
+V
R = 50~500 Ohms
R
B
P
L
L = 0.5~5 mH
P
+V
R
L
R
R
V-0.12 R
L
2
+V R
L
5R > R
L
R
I
eed switch controls to excessive
r
hock or vibration or any of the
s
following:
• Bending or placing force loads on
reed switch housing.
Over-torquing fittings on reed
•
witch housing.
s
Placing pull-out force on lead wires.
•
IRCUIT INFORMATION FOR REED SWITCH PROTECTION
C
Read information below before installing your new reed switch control!
Exceeding the current capacity of this Reed Switch control may cause FAULTY OPERATION! Be aware of the inductive and capacitive or lamp loads you may be placing on
you Reed Switch Control. The circuits below outline possible solutions to preventing overloads due to inrush or surge currents exceeding maximum or when the switch current
nd product of the inductive back EMF exceed the switch’s power rating. Also the circuit for prevention of overload when switching filament lamps (low “cold” resistance) is
a
utlined below. Failure to follow these measures to protect Reed Switch Contacts may cause the contacts to weld together or result in premature wear.
o
Possible Circuit Solutions Indicated by Dashed Lines
nductive Loads
I
Possible causes An electromagnetic relay, electromagnetic
solenoid, electromagnetic counter with inductive
component as circuit load.
Capacitive Loads
Possible causes A capacitor connected in series or parallel with
Reed Switch control. In a closed circuit, a cable
length (usually greater than 50m [162.5 ft.])
used to connect reed switch may also introduce
static capacitance.
Lamp Loads
Possible causes A tungsten filament lamp load.
DWYER INSTRUMENTS, INC.
©Copyright 2014 Dwyer Instruments, Inc.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyermail.com
Printed in U.S.A. 7/14
FR# 82-440677-00 Rev. 5
Phone: 219/879-8000 www.dwyer-inst.com
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