142505

## 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. 

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Polysulfone Float Polypropylene Float   Polypropylene Float<br>(Hollow) (Solid)<br>yi FDA i @<br>**----- End of picture text -----**<br>


For water based liquids, with Features a low specific gravity limited use in oils and chemicals. float offering broad chemical compatibility. 

With Polypropylene stem and float, switch offers broad chemical compatibility. 

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Buna N Float ALL-PVDF<br>; cis<br>FDA<br>Wetted materials of<br>construction comply with<br>a 2 FDA food contact regulations.<br>**----- End of picture text -----**<br>


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New 3/4˝ Polypropylene<br>Float<br>**----- End of picture text -----**<br>


Stem and float of corrosionSee next page for details. resistant PVDF for ultra-pure applications. 

Ideal for oils and fuels. 

## 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 

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1/8˝ NPT<br>17/32˝<br>(13.4 mm) 1/2˝ HEX<br>Y it † L1=  Actu ation L evel<br>(see  chart  below)<br>L1<br>2-3/32˝<br>(53.2 mm)<br>|, tiL -<br>1-9/16˝ 1˝<br>(39.7 mm) (25.4 mm)<br>i ni |<br>| j t<br>1˝ DIA<br>(25.4 mm)<br>—<br>**----- End of picture text -----**<br>


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Aetlrneta Mounitngs<br>8/3-˝16 G8/1˝ M12x 7.15<br>Siartgth Therad 8/1-˝28 BSP Siartgth Therad<br>.475˝ REF.<br>.390˝ REF. .315˝ REF. (12mm)<br>(9.9mm) (8.0mm)<br>(2.6mm).14˝ a HEX1/2˝ l (3.6mm) og .14˝ 9/16˝HEX l (5.1mm).20˝ ag HEX5/8˝<br>* ee et<br>elEcirtcla<br>Lead Weris Caelb Caelb<br>Tremnioitan<br>ee ee<br>**----- End of picture text -----**<br>


**A-2** 

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**FLOAT TYPE** 

How To Order – Select Part Number based on specifications required. 

|**Stem and**<br>**Mounting Material**|**Float**<br>**Material**<br>~~ee~~<br>~~|~~|**Float**<br>**Dia.**<br>~~ee~~|**Actuation**<br>**Level1**<br>~~ee~~|**Min. Liquid**<br>**Sp. Gravity**<br>~~ee~~|**Pressure Max.**<br>**@ 70°F(21°C)**<br>~~ee~~<br>~~ee~~|**Operating**<br>**Temperature**<br>~~ee~~<br>~~eee~~|**Mounting**<br>**Type**<br>~~ee~~<br>~~eee~~|**Electrical**<br>**Termination**<br>~~ee~~<br>~~eee~~|**Part Number**|
|---|---|---|---|---|---|---|---|---|---|
|Polysulfone|Polysulfone<br>~~|~~|1˝<br>||3/4˝<br>(19.0 mm)<br>||.75<br>~~tf~~|50 psi<br>(3 bar)<br>~~ee ~~<br>~~tf~~|-40°F to +225°F<br>(-40°C to +107°C)<br> ~~eee ~~<br>~~tf~~|1/8˝ NPT<br> ~~eee~~<br>~~tf~~|Lead Wires<br>~~eee~~<br>~~tf~~|**42295**<br>~~tf~~|
|Polypropylene2|Polypropylene<br>(Hollow)<br>~~a~~<br>~~pti~~|1˝<br>~~a~~<br>~~pti~~|13/16˝<br>(20.6 mm)<br>~~a~~<br>~~ptift]~~|.60<br>~~a~~<br>~~ft]~~|50 psi<br>(3 bar)<br>~~a~~<br>~~po~~<br>~~ft]~~<br>||-40°F to +225°F<br>(-40°C to +107°C)<br>~~a~~<br>~~po~~|1/8˝ NPT<br>~~a~~|Lead Wires<br>~~a~~|**142505**|
||||||||3/8˝-16<br>~~a~~<br>~~Eh~~|Lead Wires<br>~~a~~<br>~~Eh~~|**171517**|
|||||||-40°F to +176°F<br>(-40°C to +80°C)<br>~~a~~<br>~~po~~<br>~~a~~<br>~~a~~<br>~~Ee~~|G 1/8˝-28<br>~~a~~<br>~~Eh~~|Cable<br>~~a~~<br>~~Eh~~|**171518**|
||||||||M12x1.75<br>~~a~~<br>~~Eh~~<br>~~a~~<br>~~a~~<br>~~Ee~~|Cable<br>~~a~~<br>~~Eh~~<br>~~eee~~<br>~~a~~<br>~~Ee~~|**189739**|
|Polypropylene3<br>NSF Std. C-2<br>(Kynar float<br>retaining clip)|Polypropylene3<br>(Hollow)<br>NSF Std. C-2<br>~~pti~~|1˝<br>~~pti~~|13/16˝<br>(20.6 mm)<br>~~ptift]~~|.60<br>~~ft]~~|50 psi<br>(3 bar)<br>~~po~~<br>~~ft]~~<br>||-40°F to +225°F<br>(-40°C to +107°C)<br>~~po~~<br>~~a~~<br>~~a~~<br>~~Ee~~<br>~~a~~|1/8˝ NPT<br>~~Eh~~<br>~~a~~<br>~~a~~<br>~~Ee~~|Lead Wires<br>~~Eh~~<br>~~eee~~<br>~~a~~<br>~~Ee~~|**209475**|
||||||||3/8˝-16<br>~~a~~<br>~~a~~<br>~~Ee~~|Lead Wires<br>~~eee~~<br>~~a~~<br>~~Ee~~|**209455**|
||||||||G 1/8˝-28<br>~~a~~<br>~~Ee~~<br>~~a~~|Lead Wires<br>~~a~~<br>~~Ee~~<br>~~ee~~|**209460**|
||||||||M12x1.75<br>~~a~~<br>~~Ee~~<br>~~a~~|Lead Wires<br>~~a~~<br>~~Ee~~<br>~~ee~~|**209465**|
|Polypropylene2|Polypropylene<br>(Solid)<br>~~pti~~|1˝<br>~~pti~~|9/16˝<br>(14.3 mm)<br>~~pti ft]~~|.90<br>~~ft]~~|150 psi<br>(10 bar) @<br>68°F (20°C)<br>~~ft]~~<br>|<br>~~ee~~|-40°F to +150°F<br>(-40°C to +66°C)<br>~~a~~<br>~~Ee~~<br>~~a~~|1/8˝ NPT<br>~~a~~<br>~~Ee~~<br>~~a~~|Lead Wires<br>~~a~~<br>~~Ee~~<br>~~ee~~|**116826**|
||||||||3/8˝-16<br>~~a~~<br>~~Ee~~|Lead Wires<br>~~a~~<br>~~Ee~~|**171514**|
|||||||-40°F to +176°F<br>(-40°C to +80°C)<br>~~a~~<br>~~ee~~|M12x1.75<br>~~a~~<br>~~ee~~|Cable<br>~~a~~<br>~~ee~~|**189787**|
|||3/4˝<br>~~ee~~|7/16˝<br>(11.1 mm)<br>~~ee~~|.95<br>~~ee~~|Atmospheric<br>~~ee~~<br>~~ee~~|-40°F to +212°F<br>(-40°C to +100°C)<br>~~ee~~<br>~~ee~~|1/8˝ NPT<br>~~ee~~<br>~~ee~~|Lead Wires<br>or Cable<br>~~ee~~<br>~~ee~~|**201540**|
|Nylon|Buna<br>~~|}~~|1˝<br>~~|}~~|13/16˝<br>(20.6 mm)<br>~~|}~~|.45|150 psi<br>(10 bar)<br>~~ee~~<br>~~ee~~|-40°F to +250°F (oil)<br>(-40°C to +121°C [oil])<br>~~ee~~|1/8˝ NPT<br>~~ee~~|Lead Wires<br>~~ee~~|**162745**|
|||||||-40°F to +176°F (water)<br>(-40°C to +80°C [water])<br>~~a~~<br>~~ee~~|M12x1.75<br>~~a~~<br>~~ee~~|Cable<br>~~a~~<br>~~ee~~|**189786**|
|||3/4˝<br>~~ee~~<br>~~|}~~|11/16˝<br>(17.5mm)<br>~~ee~~<br>~~|}~~|.85<br>~~ee~~|150 psi<br>(10.3 bar)<br>~~ee~~<br>~~ee~~|-40°F to +250°F (oil)<br>(-40°C to +121°C [oil])<br>~~ee~~<br>~~ee~~|1/8˝ NPT<br>~~ee~~<br>~~ee~~|Lead Wire<br>~~ee~~<br>~~ee~~|**177818**|
|PVDF|PVDF<br>~~|}~~|1˝<br>~~|}~~|1/2˝<br>(12.7 mm)<br>~~|}~~<br>~~|~~|.86<br>~~|~~|50 psi<br>(3 bar)<br>~~ee~~<br>~~|~~|-40°F to +250°F<br>(-40°C to +121°C)<br>~~ee~~<br>~~|~~|1/8˝ NPT<br>~~ee~~<br>~~|~~|Teflon Jacketed<br>Lead Wires<br>~~ee~~<br>~~|~~<br>~~41~~|**173250**<br>~~41~~|



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. 

## 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. 

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Actual Size<br>**----- End of picture text -----**<br>


- 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**<br>**Stem and Mounting**|
|---|
|**P/N 201540**<br>Polypropylene with Kynar retainingclip|
|**P/N 177818**<br>Nylon<br>**Float**<br>**P/N 201540**<br>Polypropylene<br>~~—~~|
|**P/N 177818**<br>Buna-N<br>~~—————~~|
|**Operating Temperature, Max.**<br>**P/N 201540**<br>212°F(100°C)<br>**P/N 177818**<br>250°F(121°C)oil,-40°F to +176°F(-40°C to +80°C)<br>~~co~~|
|**Pressure, Max.**|
|**P/N 201540**<br>Atmospheric<br>**P/N 177818**<br>150 psi (10.3 bar)|



Dimensions 

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17/32˝<br>(13.4 mm)<br>1/8˝ NPT<br>1/2˝ HEX<br>L1 [†]<br>2-3/32˝<br>(53.2 mm) [| 1<br>1-9/16˝ 1˝<br>(39.7 mm) (25.4 mm)<br>—| (19 mm)3/4˝ DIA † L1=  Actuation Level (see chart above)<br>Order by Part Numbers:<br>**----- End of picture text -----**<br>


**LS-3, 3/4˝ Polypropylene Float: 201540 LS-3, 3/4˝ Buna–N Float: 177818** 

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## 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 

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_<br>Cut-away version shown<br>**----- End of picture text -----**<br>


Compact, allpolypropylene switch with slosh shield is ideal for use with turbulent liquids in small tanks. FDA compliant materials. 

For external mounting For detecting levels as on tanks too small to low as 5/8˝  from tank accommodate internally bottom. Use in water, mounted switches. some oils and chemicals. (See note below) 

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1/8”-27 NPSM TH’D<br>1/8˝ NPT<br>1/8˝ NPT (3.2 mm)<br>| (13.4 mm)17/32˝ ig 1/2˝ HEX STEM i (10 mm)25/64˝<br>(12.7 mm) FL OAT<br>1/2˝ HEX<br>2-3/32˝ 9/16˝ ACTUATION L1=3/4” 2.09˝ (13 mm)<br>(53.2 mm) (14.3 mm) [†] 3 1/2” REF. LEVEL (53.1 mm)  1-15/32˝<br>| 1-9/16˝ oy fai —_ 15/16˝ = (37.3 mm) |<br>(39.7 mm) (23.8 mm)<br>#22 AW G WIRE,<br>1-1/4˝ DIA.(31.7 mm) 1/4” NPT REF.(2) PLACES DIA. REF.1 9/16” P 72”-78” EXT.OLYMERIC (6.4 mm)0.250˝ 1.86˝ DI A.<br>(47.4 mm)<br>Order By Part Number 142545 46999 76707 ;<br>Materials<br>Stem and Mounting All Polypropylene (Including Shield [4] ) Polysulfone All Polysulfone (Including Collar)<br>Float a Polypropylene (Solid) Polysulfone Buna N<br>Other Wetted a — Brass, Aluminum, Polycarbonate, Viton A Epoxy<br>Min. Liquid Sp. Gr. ee .90 .75 —<br>Operating Temperature a -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)<br>Pressure, PSI, Max. [3] _ 150 50<br>Switch [1] , SPST Te 20 VA, N.C./N.O. Dry [2] 20 VA, N.C. Dry<br>Electrical Termination a No. 22 AWG, 22˝ L., PVC Lead Wires No. 22 AWG, 72˝ L., Polymeric Lead Wires No. 22 AWG, 72˝ L., PVC Lead Wires<br>Notes: Note: LS-3 Series Bottle Level Switch is also available with any of the float materials shown on<br>1. See “Electrical Data” on Page X-5 for more information. opposite page. Contact GEMS for correct part number.<br>**----- End of picture text -----**<br>


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. 

~~4~~ – Stock Items. 

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** 

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