FLOAT TYPE Large Size - Alloys LS-1800 and LS-1900 Series are a Step Above Our Plastic Units for Pressure Capabilities Excellent stability for general use in oils and water. LS-1800 Series - Teflon(R) Float LS-1900 Series - Buna N Float Intermediate in size, LS-1800 switches provide long life and dependability to meet a broad range of requirements. LEVEL SWITCHES - SINGLE POINT LS-1800 Series - Buna N Float With large float displacement, switch withstands rough service; is suitable for high viscosity liquids. Dimensions LS-1800 Series LS-1900 Series Teflon(R) Float Buna N Float 1/8" NPT 1/8" NPT 17/32" (13.5 mm) Buna N Float 17/32" (13.5 mm) 1/2" HEX (12.7 mm) 1/4" NPT 21/32" (16.7 mm) 1/2" HEX (12.7 mm) 5/8" HEX (15.9 mm) SPRING 7/8" 2-15/16" (22.2 mm) (74.6 mm) 1-3/4" (44.5 mm) 2-13/32" (61.1 mm) 2-15/16" (74.6 mm) 7/8" (22.2 mm) 1-3/4" (44.5 mm) 2-13/32" (61.1 mm) FLAT WASHER 1-1/4" DIA. (31.7 mm) 3-3/16" (80.9 mm) 1-3/16" (30.2 mm) 1-13/16" (46.1 mm) 2-17/32" (64.3 mm) 1-1/4" DIA. (31.75 mm) 1-7/8" DIA. (47.6 mm) L1 = Switch actuation level, nominal (based on a liquid specific gravity of 1.0). Common Specifications Electrical Termination: No.18 AWG, 24 L., Polymeric Lead Wires. Approvals: All Switches on this page are U.L. Recognized - File No. E45168, and are CSA Listed - File No. 30200. Switch Operation: Selectable, N.O. or N.C., by inverting float on unit stem (except for LS-1800 Series switch with Teflon(R) float). Units are shipped N.O. unless otherwise specified. How To Order - Select Part Number based on specifications required. Material Series Number LS-1800 Stem and Mounting Float Brass Buna N 316 Stainless Steel Buna N 316 Stainless Steel Buna N Min. Liquid Sp. Gr. .75 316 Stainless Steel, Hysol Teflon(R) Brass LS-1900 Other Wetted .75 .65 316 Stainless Steel, Hysol *See "Electrical Data" on Page X-5 for more information. **LS-1800 100 VA switches are not U.L. Recognized. .55 .55 Operating Temperature Pressure, PSI, Max. Water: to 180F (82C) Oil: -40F to +230F (-40C to +110C) 150 -40F to +250F (-40C to +121C) 300 Water: to 180F (82C) Oil: -40F to +230F (-40C to +110C) 150 Switch* SPST Part Number 20 VA 01801 100 VA** 35651 20 VA 01807 100 VA** 35657 20 VA, N.O. 01811 20 VA 01901 100 VA*** 35676 20 VA 01907 100 VA 35682 *** LS-1900 100VA unit is UL Resistive Rated. Visit www.GemsSensors.com for most current information. A-13