SWITCH ACTION (Normally open/Normally closed)
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 F7-
HSS 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.
Series F7 Liquid Level Switches
Bulletin E-75
PIPE
COUPLING
ELBOW
PIPE
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057
e-mail: [email protected]
SPECIFICATIONS
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-HPS-
2, 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); F7-
BT, 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).
(Model F7-SB Shown)
Model
F7-SB
F7-SS2
F7-PP
F7-BT
F7-MPP
(A) Stem
Length
2.75 (70)
2.06 (52)
2.18 (55)
2.18 (55)
1.63 (41)
(B) Float
Diameter
1.13 (29)
1.0 (25)
1.18 (30)
1.18 (30)
0.63 (16)
(C) Float
Height
1.38 (35)
1.0 (25)
1.0 (25)
1.0 (25)
0.63 (16)
(D) Actuation
from HEX
1.0 (26)
0.73 (19)
0.69 (18)
0.69 (18)
0.47 (12)
Model
Vertical Mount
F7-SB
F7-SS2
F7-PP
F7-BT
F7-MPP
Horizontal Mount
F7-HPS
-1, -2
F7-HSS
Material
Float/Stem
Buna-N & Epoxy/316SS
316SS (CYC)/316SS
Polypropylene &
Epoxy/Polypropylene
Buna-N & Epoxy/PBT*
Polypropylene /
Polypropylene
Polysulfone/
Polysulfone
316SS/316SS
Max
Temp.
220°F
105°C
300°F
149°C
220°F
105°C
220°F
105°C
176° F
80° C
185°F
85°C
392°F
200°C
Max
Press.
150 psig
10 bar
450 psig
31 bar
100 psig
6.89 bar
150 psig
10 bar
100 psig
6.89 bar
150 psig
10 bar
300 psig
20.7 bar
Min
S.G.
0.60
0.75
0.60
0.45
0.90
0.85
0.60
Approx.
Deadband
1/16˝
2 mm
1/16˝
2 mm
1/8˝
4 mm
1/8˝
4 mm
1/8˝
4 mm
3/16˝
5 mm
1/8˝
4 mm
Dimensions, Inches (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.
A-348,
1/8˝ x 1-1/2˝ NPT C.S. Adapter.
A-348-SS,
1/8˝ x 1-1/2˝ NPT 316SS Adapter.
13/16 [20.62]
DIA. MAX.
1-33/64
[38.48]
40
∞
MAX
3-15/32 [88/09]
M16X2
SWITCH 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]
APPROXIMATE
ACTUATION LEVEL
FITTING
CENTERLINE
3/32
[2.54]
1-7/32 MAX
[31.0]
1-5/32 MAX
[29.2]
C
B
D A
EXTERNALLY
WELDED FLANGE
F7-HPS-2, INTERNAL HORIZONTAL MOUNT
F7-HPS-2, EXTERNAL HORIZONTAL MOUNT
Specifications - Installation and Operating Instructions
F7-HSS
1.800.868.7495
QualityInstruments-Direct
.ca
