Gems Sensors & Controls LS-3 Specifications
2-3/32˝
(53.2 mm)
1-9/16˝
(39.7 mm)
1˝
(25.4 mm)
1/8˝ NPT
3/8˝ – 16
1/2˝ HEX
1/2˝ HEX
1˝ DIA
(25.4 mm)
L
1
17/32˝
(13.4 mm)
sgnitnuoMetanretlA
61-˝8/3
daerhTthgiartS
˝8/1G
PSB82-˝8/1
57.1x21M
daerhTthgiartS
lacirtcelE
noitanimreT
seriWdaeL elbaC elbaC
.14˝
(3.6mm)
9/16˝
HEX
.315˝ REF.
(8.0mm)
.14˝
(2.6mm)
1/2˝
HEX
.390˝ REF.
(9.9mm)
.20˝
(5.1mm)
5/8˝
HEX
.475˝ REF.
(12mm)
Small Size – Engineered Plastics
LS-3 Series – Offers High Reliability, Compact Size
and Low Costs in NPT, Straight and Metric Threads
Ideal for shallow tanks or restricted spaces, or for any low-cost, high volume use.
LS-3 Series are available in FDA compliant materials, consult GEMS for details.
LEVEL SWITCHES – SINGLE POINT
Polysulfone Float
FDA
Polypropylene Float
(Hollow)
Polypropylene Float
(Solid)
For water based liquids, with
limited use in oils and chemicals.
Buna N Float
Features a low specific gravity
float offering broad chemical
compatibility.
ALL-PVDF
With Polypropylene stem and
float, switch offers broad chemical
compatibility.
New 3/4˝ Polypropylene
Float
FDA
Wetted materials of
construction comply with
FDA food contact regulations.
Ideal for oils and fuels.
Stem and float of corrosion-
See next page for details.
resistant PVDF for ultra-pure
applications.
Common Specifications
Approvals: U.L. Recognized – File No. E45168; CSA Listed – File No. 30200. CE Declaration Available Upon Request.
NSF materials are Standard 61 compliant. For NSF approved level switches contact Gems.
Switch SPST: 20 VA, 120-240 VAC. Units are shipped N.O. unless otherwise specified. Selectable, N.O. or N.C., by inverting float on unit stem.
Dimensions – 1˝ Float Models only
A-2
†
L1= Actuation Level
(see chart below)
Visit www.GemsSensors.com for most current information.
2-3/32˝
(53.2 mm)
1-9/16˝
(39.7 mm)
1˝
(25.4 mm)
1/8˝ NPT
1/2˝ HEX
3/4˝ DIA
(19 mm)
L
1
†
17/32˝
(13.4 mm)
How To Order – Select Part Number based on specifications required.
Stem and
Mounting Material
Polysulfone Polysulfone 1˝
Polypropylene
Polypropylene
NSF Std. C-2
(Kynar float
retaining clip)
Polypropylene
Nylon Buna
PVDF PVDF 1˝
Notes:
1. Based on a liquid specific gravity of 1.0.
2. All Polypropylene units carry a Kynar retaining clip. Accessories Available in OEM Quantities: Jam Nut, Gaskets, and Slosh Shields.
3. NSF C-2 Approved unit, for water use only.
Polypropylene
2
3
Polypropylene
NSF Std. C-2
Polypropylene
2
Float
Material
(Hollow)
(Hollow)
(Solid)
Float
Actuation
Dia.
3
3/4˝
3/4˝
1˝
1˝
1˝
1˝
Level
3/4˝
(19.0 mm)
13/16˝
(20.6 mm)
13/16˝
(20.6 mm)
9/16˝
(14.3 mm)
7/16˝
(11.1 mm)
13/16˝
(20.6 mm)
11/16˝
(17.5mm)
1/2˝
(12.7 mm)
1
Min. Liquid
Sp. Gravity
.75
.60
.60
.90
.95 Atmospheric
.45
.85
.86
Pressure Max.
@ 70°F (21°C)
(10 bar) @
68°F (20°C)
(10.3 bar)
50 psi
(3 bar)
50 psi
(3 bar)
50 psi
(3 bar)
150 psi
150 psi
(10 bar)
150 psi
50 psi
(3 bar)
Operating
Temperature
-40°F to +225°F
(-40°C to +107°C)
-40°F to +225°F
(-40°C to +107°C)
-40°F to +176°F
(-40°C to +80°C)
-40°F to +225°F
(-40°C to +107°C)
-40°F to +150°F
(-40°C to +66°C)
-40°F to +176°F
(-40°C to +80°C)
-40°F to +212°F
(-40°C to +100°C)
-40°F to +250°F (oil)
(-40°C to +121°C [oil])
-40°F to +176°F (water)
(-40°C to +80°C [water])
-40°F to +250°F (oil)
(-40°C to +121°C [oil])
-40°F to +250°F
(-40°C to +121°C)
Mounting
Type
1/8˝ NPT
1/8˝ NPT
3/8˝-16
G 1/8˝-28
M12x1.75
1/8˝ NPT
3/8˝-16
G 1/8˝-28
M12x1.75
1/8˝ NPT
3/8˝-16
M12x1.75
1/8˝ NPT
1/8˝ NPT
M12x1.75
1/8˝ NPT
1/8˝ NPT
FLOAT TYPE
Electrical
Termination
Lead Wires
Lead Wires
Lead Wires
Cable
Cable
Lead Wires
Lead Wires
Lead Wires
Lead Wires
Lead Wires
Lead Wires
Cable
Lead Wires
or Cable
Lead Wires
Cable
Lead Wire
Teflon Jacketed
Lead Wires
Part Number
42295
142505
171517
171518
189739
209475
209455
209460
209465
116826
171514
189787
201540
162745
189786
177818
173250
– Stock Items.
LEVEL SWITCHES – SINGLE POINT
3/4˝ Diameter Floats for Tiny Tanks
Our smallest LS-3 yet!
Reliable alternative to more expensive electronic sensors.
Fits smaller devices. Less material, lower cost.
Proprietary float more buoyant than competitors.
Small yes, but with BIG performance. No other 3/4˝ float switch on the
market matches our LS-3 specs. These units are ideal for potable water,
medical devices and other compact appliances, such as printers. Gems
proprietary float enables use in lighter-than-water fluids. NSF/ FDA
compliant models available at your request. Please consult factory.
Specifications
Wetted Material
Stem and Mounting
P/N 201540 Polypropylene with Kynar retaining clip
P/N 177818 Nylon
Float
P/N 201540 Polypropylene
P/N 177818 Buna-N
Operating Temperature, Max.
P/N 201540 212°F (100°C)
P/N 177818 250°F (121°C) oil, -40°F to +176°F (-40°C to +80°C)
Pressure, Max.
P/N 201540 Atmospheric
P/N 177818 150 psi (10.3 bar)
Visit www.GemsSensors.com for most current information.
Dimensions
†
L1= Actuation Level
(see chart above)
Order by Part Numbers:
LS-3, 3/4˝ Polypropylene Float: 201540
LS-3, 3/4˝ Buna–N Float: 177818
Actual Size
A-3
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