LS-1700 Series Single-Point Level Switch0 pages

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.

LEVEL SWITCHES – SINGLE POINT

LS-1700 Series –
Buna N Float

LS-1700 Series –
Teflon® Float

LS-1750 Series –
All Stainless Steel

Offer broad chemical compatibility for general purpose
use. Also ideal for oils and water.

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.

Dimensions
LS-1700 Series

LS-1750 Series
Teflon® Float

Buna N Float

1/2" HEX
(12.7 mm)

L1†

1-1/2"
(38.1 mm)

3/4"
(19.1 mm)

1"
(25.4 mm)

1-1/2"
(38.1mm)

1" DIA.
(25.4 mm)

1/2" HEX
(12.7 mm)

2-21/64"
(59.1mm)

2-1/16" L1†
(52.4 mm)

1-1/2"
(38.1mm)
FLAT
WASHER

L1= 9/16˝ (14.2 mm) N.O.; 13/16˝ (20.6 mm) N.C.

1/2" HEX
(12.7 mm)

SPRING

L1†

1" DIA.
(25.4 mm)

1/8" NPT

1/8" NPT

1/2" HEX
(12.7 mm)

2-1/16"
(52.4mm)
1"
(25.4 mm)

LS-1755 Series

Stainless Steel Float and Stem
1/8" NPT

1/8" NPT

2-1/16"
(52.4 mm)

LS-1755 Series –
All Stainless Steel

1-7/32"
(31.0 mm)

1-45/64"
(42.8mm)

1-1/32" DIA.
(26.2 mm)

1-1/2" DIA.
(38.1 mm)

L1= 1/2˝ (12.7 mm) N.O. and N.C.

L1†

L1= 5/8˝ (15.7 mm) N.O.; 3/4˝ (19.1 mm) N.C.

L1= 37/64˝ (14.5 mm) N.O.; 53/64˝ (20.8 mm) N.C.

†L1= 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.
Material
Series
Number

Stem and
Mounting
Brass

LS-1700

316 S.S.

Float
Buna N

Other
Wetted

316 S.S.,
Epoxy

Min. Liquid
Sp. Gr.

Operating Temperature

Pressure,
PSI, Max.**

.45

Water: to 180°F (82.2°C)
Oil: -40°F to +300°F (-40°C to +149°C)

300

.85

-40°F to +250°F (-40°C to +121.1°C)

1000

316 S.S.

Teflon®

LS-1750

316 S.S.

316 S.S.

316 S.S.

.70

LS-1755

316 S.S.

316 S.S.

316 S.S.

.90

-40°F to +300°F (-40°C to +148.9°C)
-40°F to +480°F (-40°C to +204.4°C)
-40°F to +300°F (-40°C to +148.9°C)

* See “Electrical Data” on Page X-5 for more information.
** Higher pressures are temperature dependent.

A-10

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100
275

Switch*
SPST

Part
Number

20 VA

01701

20 VA

01702

20 VA, N.O.

26791

20 VA, N.C.

27980

20 VA

01750

20 VA

79990

20 VA

01755