LEVEL S WIT CHES – SINGLE POINT

LEVEL S WIT CHES – SINGLE POINT
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
Polypropylene Float
(Hollow)
Polypropylene Float
(Solid)
Features a low specific gravity float
offering broad chemical compatibility.
With Polypropylene stem and
float, switch offers broad chemical
compatibility.
FDA
For water based liquids, with limited
use in oils and chemicals.
Ro H S
G
Buna N Float
ALL-PVDF
New 3/4˝ Polypropylene
Float
EM
®
S CO PLIAN
M
T
Ro H S
G
EM
®
S CO PLIAN
M
T
RoHS Compliant:
All LS-3 Series level
switches featured on this
page and the next are in
compliance with
EU-directive 2011/65/EC.
FDA
Wetted materials of
construction comply with
FDA food contact regulations.
Ideal for oils and fuels.
Stem and float of corrosion-resistant
PVDF for ultra-pure applications.
See next page for details.
Common Specifications
Approvals: U.L. Recognized – File No. E45168; CSA Listed – File No. 30200. CE Declaration Available Upon Request.
NSF materials are NSF 169 Standard compliant. For NSF approved level switches contact Gems.
RoHS – In compliance with EU-directive 2011/65/EC requirements for chemicals and substances.
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
Alternate Mountings
3/8˝-16
Straight Thread
1/8˝ NPT
17/32˝
(13.4 mm)
2-3/32˝
(53.2 mm)
1/2˝ HEX
L1✝
1-9/16˝
(39.7 mm)
M12x 1.75
Straight Thread
3/8˝ – 16
L1= Actuation Level
(see chart below) 1/2˝ HEX
.390˝ REF.
(9.9mm)
.14˝
(2.6mm)
1˝
(25.4 mm)
1˝ DIA
(25.4 mm)
A-2
†
G1/8˝
1/8˝-28 BSP
Electrical
Termination
1/2˝
HEX
Lead Wires
Visit www.GemsSensors.com for most current information.
.475˝ REF.
(12mm)
.315˝ REF.
(8.0mm)
9/16˝
HEX
.14˝
(3.6mm)
Cable
5/8˝
HEX
.20˝
(5.1mm)
Cable
LS-3 Series / p1of3 / 07-OCT-14
FLOAT TYPE
Stem and
Mounting Material
Float
Material
Float
Dia.
Polysulfone
Polysulfone
1˝
Polypropylene
(Hollow)
Polypropylene3
Polypropylene3
NSF Std. 169
(Hollow)
(Kynar float retaining
NSF Std. 169
clip)
Polypropylene
2
Polypropylene2
Nylon
PVDF
Polypropylene
(Solid)
Min. Liquid
Sp. Gravity
.75
Pressure Max.
@ 70°F (21°C)
50 psi
(3 bar)
Operating
Temperature
-40°F to +225°F
(-40°C to +107°C)
Mounting
Type
Electrical
Termination
Part Number
1/8˝ NPT
Lead Wires
42295
-40°F to +225°F
(-40°C to +107°C)
1/8˝ NPT
3/8˝-16
G 1/8˝-28
M12x1.75
1/8˝ NPT
3/8˝-16
Lead Wires
Lead Wires
Cable
Cable
Lead Wires
Lead Wires
142505
171517
171518
189739
209475
G 1/8˝-28
M12x1.75
1/8˝ NPT
3/8˝-16
Lead Wires
Lead Wires
Lead Wires
Lead Wires
209455
209460
209465
116826
171514
-40°F to +176°F
(-40°C to +80°C)
M12x1.75
Cable
189787
-40°F to +212°F
(-40°C to +100°C)
1/8˝ NPT
Lead Wires
or Cable
201540
-40°F to +250°F (oil)
(-40°C to +121°C [oil])
1/8˝ NPT
Lead Wires
162745
-40°F to +176°F (water)
(-40°C to +80°C [water])
M12x1.75
Cable
189786
1˝
13/16˝
(20.6 mm)
.60
50 psi
(3 bar)
1˝
13/16˝
(20.6 mm)
.60
50 psi
(3 bar)
1˝
9/16˝
(14.3 mm)
.90
150 psi
(10 bar) @
68°F (20°C)
3/4˝
7/16˝
(11.1 mm)
.95
Atmospheric
1˝
13/16˝
(20.6 mm)
.45
150 psi
(10 bar)
3/4˝
11/16˝
(17.5mm)
.85
150 psi
(10.3 bar)
-40°F to +250°F (oil)
(-40°C to +121°C [oil])
1/8˝ NPT
Lead Wire
177818
1˝
1/2˝
(12.7 mm)
.86
50 psi
(3 bar)
-40°F to +250°F
(-40°C to +121°C)
1/8˝ NPT
Teflon Jacketed
Lead Wires
173250
Buna
PVDF
Actuation
Level1
3/4˝
(19.0 mm)
-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)
LEVEL SWITCHES – SINGLE POINT
How To Order – Select Part Number based on specifications required.
– Stock Items.
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 169 Approved unit, for water use only.
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
P/N 177818
Float
P/N 201540
P/N 177818
Magnet
P/N 201540
Operating Temperature, Max.
P/N 201540
P/N 177818
Pressure, Max.
P/N 201540
P/N 177818
LS-3 Series / p2of3 / 07-OCT-14
Actual Size
Ro H S
G
Polypropylene
Buna-N
EM
®
S CO PLIAN
M
T
Dimensions
1/8˝ NPT
1/2˝ HEX
L1†
2-3/32˝
(53.2 mm)
1-9/16˝
(39.7 mm)
1˝
(25.4 mm)
†
Ceramic
Atmospheric
150 psi (10.3 bar)
T
G
3/4˝ DIA
(19 mm)
212°F (100°C)
250°F (121°C) oil, -40°F to +176°F (-40°C to +80°C)
®
S CO PLIAN
M
Ro H S
17/32˝
(13.4 mm)
Polypropylene with Kynar retaining clip
Nylon
EM
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
Visit www.GemsSensors.com for most current information.
A-3
Unique Features Make These LS-3 Models Special
These small switches feature unique
configurations for special applications.
Part No. 142545
With Slosh Shield
Part No. 46999
Bottle Level
Part No. 76707
For Low Level
LEVEL SWITCHES – SINGLE POINT
Ro H S
G
Ro H S
Ro H S
EM
®
S CO PLIAN
M
T
Ro H S
G
G
EM
G
®
S CO PLIAN
M
T
EM
G
EM
®
S CO PLIAN
M
T
T
Ro H S
G
®
S CO PLIAN
M
EM
®
S CO PLIAN
M
Ro H S
T
EM
®
S CO PLIAN
M
T
Cut-away version shown
Compact, all-polypropylene
switch with slosh shield is
ideal for use with turbulent
liquids in small tanks. FDA
compliant materials.
For external mounting on
tanks too small to accommodate internally mounted
switches. (See note
below)
For detecting levels as low
as 5/8˝ from tank bottom.
Use in water, some oils and
chemicals.
3/8˝-24
NPSM
THD.
3/8˝-24
NPSM
THD.
1/8˝1/8˝
NPTNPT
17/32˝
17/32˝
(13.4
mm)
(13.4
mm)
1/8˝1/8˝
NPTNPT
(3.2(3.2
mm)
mm)
25/64˝
25/64˝
(10(10
mm)
mm)
STEM
1/2˝1/2˝
HEXHEX
(12.7
mm)
(12.7
mm)
FLOAT
3-15/32˝
3-15/32˝
(88.1
mm)
(88.1
mm)
9/16˝
9/16˝
2-3/32˝
2-3/32˝ (14.3 mm)† †
(14.3 mm)
(53.2
mm)
(53.2
mm)
1-13/16˝
1-13/16˝
2.09˝
2.09˝
ACTUATION
† †
(46.1 mm)
L1=3/4”
mm)
(53.1
mm)
LEVEL (46.1 mm) (53.1
3 1/2” REF.
1/2˝1/2˝
HEXHEX
(13(13
mm)
mm)
1-15/32˝
1-15/32˝
(37.3
mm)
(37.3
mm)
15/16˝
15/16˝
(23.8
mm)
(23.8
mm)
1-9/16˝
1-9/16˝
(39.7
mm)
(39.7
mm)
1/4˝1/4˝
NPTNPT
1-1/4˝
DIA.DIA.
1-1/4˝
(31.7
mm)
(31.7
mm)
Order By Part Number
1/8”-27 NPSM TH’D
1-1/4˝
1-1/4˝
(31.7
mm)
(31.7
mm)
1/4” NPT REF.
(2) PLACES
1 9/16”
DIA. REF.
1-9/16˝
DIA.DIA.
1-9/16˝
(39.6
mm)
(39.6
mm)
#22 AWG WIRE,
POLYMERIC
72”-78”
EXT.
1/4˝1/4˝
NPT
NPT
0.250˝
0.250˝
(6.4(6.4
mm)
mm)
1.86˝
DIA.DIA.
1.86˝
(47.4
mm)
(47.4
mm)
142545
46999
76707
All Polypropylene (Including Shield4)
Polysulfone
All Polysulfone (Including Collar)
Polypropylene (Solid)
Polysulfone
Buna N
—
Brass, Aluminum, Polycarbonate, Viton A
Epoxy
Materials
Stem and Mounting
Float
Other Wetted
Min. Liquid Sp. Gr.
Operating Temperature
Pressure, PSI, Max.3
Switch , SPST
1
Electrical Termination
.90
.75
—
-40°F to +150°F (-40°C to +65.6°C)
-40°F to +120°F (-40°C to +48.9°C)
-40°F to +180°F (-40°C to +82.2°C)
150
50
20 VA, N.C./N.O. Dry2
20 VA, N.C. Dry
No. 22 AWG, 22˝ L., PVC Lead Wires
Notes:
1. See “Electrical Data” on Page X-5 for more information.
2. Switch operation is selectable, N.O. or N.C., by inverting the float on the unit stem.
3. Maximum pressure at 70°F (21°C).
4. Consult factory for other available materials.
† L1= Switch actuation level, nominal (based on a specific gravity of 1.0).
A-4
No. 22 AWG, 72˝ L., Polymeric Lead Wires
No. 22 AWG, 72˝ L., PVC Lead Wires
Note: LS-3 Series Bottle Level Switch is also available with any of the float materials shown on opposite
page. Contact GEMS for correct part number.
– Stock Items.
Visit www.GemsSensors.com for most current information.
LS-3 Series / p3of3 / 25-NOV-14
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