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LEVEL SWITCHES – SINGLE POINT
Material
Series
Number
Stem and
Mounting Float Other
Wetted
Min. Liquid
Sp. Gr. Operating Temperature Pressure,
PSI, Max.**
Switch*
SPST
Part
Number
LS-1700
Brass Buna N
316 S.S.,
Epoxy
.45 Water: to 180°F (82.2°C)
Oil: -40°F to +300°F (-40°C to +149°C) 300 20 VA 01701
316 S.S. 20 VA 01702
316 S.S. Teflon®.85 -40°F to +250°F (-40°C to +121.1°C) 1000 20 VA, N.O. 26791
20 VA, N.C. 27980
LS-1750 316 S.S. 316 S.S. 316 S.S. .70 -40°F to +300°F (-40°C to +148.9°C) 100 20 VA 01750
-40°F to +480°F (-40°C to +204.4°C) 20 VA 79990
LS-1755 316 S.S. 316 S.S. 316 S.S. .90 -40°F to +300°F (-40°C to +148.9°C) 275 20 VA 01755
seireS0071-SL seireS0571-SL seireS5571-SL
taolFNanuB taolFnolfeT metSdnataolFleetSsselniatS
1" DIA.
(25.4 mm)
1"
(25.4 mm)
2-1/16"
(52.4 mm)
L1†
1/2" HEX
(12.7 mm)
1/8" NPT
1-1/2"
(38.1 mm)
1" DIA.
(25.4 mm)
3/4"
(19.1 mm)
2-1/16"
(52.4mm)
L1†
FLAT
WASHER
SPRING
1/2" HEX
(12.7 mm)
1/8" NPT
1-1/2"
(38.1mm)
1-1/2" DIA.
(38.1 mm)
1"
(25.4 mm)
2-1/16"
(52.4 mm)
L1†
1-1/2
"
(38.1mm)
1/2" HEX
(12.7 mm)
1/8" NPT
1-1/32" DIA.
(26.2 mm)
1-7/32"
(31.0 mm)
2-21/64"
(59.1mm)
L1†
1-45/64"
(42.8mm)
1/2" HEX
(12.7 mm)
1/8" NPT
®
Small Size – Alloys
Rugged Durability, With Broad Heat and Pressure Capabilities,
are Hallmarks of These Compact Switches
Ideal for shallow tanks or restricted spaces, or for low-cost, high volume use.
LS-1700 Series –
Buna N Float
LS-1700 Series –
Teflon® Float
Offer broad chemical compatibility for general purpose
use. Also ideal for oils and water.
LS-1750 Series –
All Stainless Steel
Rugged construction suitable for most corrosive liquids, and for
high temperatures and pressures. Stainless steel is generally recognized
as safe (GRAS) with FDA for food contact regulations.
LS-1755 Series –
All Stainless Steel
Dimensions
L1= 37/64˝ (14.5 mm) N.O.; 53/64˝ (20.8 mm) N.C.L1= 9/16˝ (14.2 mm) N.O.; 13/16˝ (20.6 mm) N.C. L1= 1/2˝ (12.7 mm) N.O. and N.C. L1= 5/8˝ (15.7 mm) N.O.; 3/4˝ (19.1 mm) N.C.
† L 1= Switch actuation level, nominal (based on a liquid specific gravity of 1.0).
Common Specifications
Electrical Termination: No. 22 AWG, 24˝ L., Polymeric Lead Wires,
(except Part No. 79990 which has Teflon® Lead Wires).
Approvals: Series Nos. LS-1700, LS-1750 and LS-1755 are U.L. Recognized –
File No. E45168 and CSA Listed – File No. 30200.
Switch Operation: Units are shipped N.O. unless otherwise specified. Selectable,
N.O. or N.C., by inverting float on unit stem (except for LS-1700 Series switches with
Teflon® Floats; see selection in “How to Order” table).
How To Order – Select Part Number based on specifications required.
* See “Electrical Data” on Page X-5 for more information.
** Higher pressures are temperature dependent.
