M Series Single-Point Liquid Level Switches Madison Company offers a complete line of Standard and Configured (slightly modified Standard designs) models. These products continue to meet the needs of applications in many markets, at competitive prices. In addition, Madison Company offers the capability to design specific liquid level switches for OEM applications that require unique considerations in materials, configurations and system interfacing. Engineered designs incorporate over 50 years of experience in liquid level switch applications in a variety of environments and installation configurations. High reliability of the magnetic reed switch technology assures repeatability at an economical price. Our design experience and flexible manufacturing techniques also offer customers many value-added design and assembly options to reduce their product cost. Engineered single-level switches Features • • • • Single-point • Magnetic reed switch technology High reliability • Wide selection of available materials Three basic sizes: full, miniature and subminiature Direct interface to controllers available Each style switch is equipped with a means to identify which type of operation to which the switch is set. Vertical: NO/NC operation is indicated by the position of the witness mark (stainless steel models) or magnets (plastic models). NO is indicated by circle up (stainless steel) or magnets down plastic); NC is indicated by circle down (stainless steel) or magnets up (plastic). Horizontal: NO/NC operation is indicated by the direction of the arrow on the hex. NO is indicated by arrow up; NC is indicated by arrow down. An ohmmeter or continuity meter can be used to verify the switch setting and operation. Simply connect the meter to the leads and, with the float hanging down away from the fitting, measure the switch. If the meter reads a short, then the switch is normally closed and will open on rise. All switches are shipped in the Normally Closed (NC) position, unless otherwise specified. To change the contact operation, simply remove the retaining ring and float and reverse the float on the stem. The only exception to this is the subminiature switch (M3326/M3326-NO), for which operation must be specified when ordered, since the float is not reversible on this switch. Madison Company • (203) 488-4477 • (800) 466-5383 • Fax (203) 481-5036 • [email protected] • www.madisonco.com © Copyright Madison Company – 3/11 LL-9 LL

Material Selection Guide LL The first consideration is the type of liquid, temperature and pressure to which the switch will be subjected. Madison manufactures liquid level switches in various styles, in a variety of materials, to cover a broad range of conditions. Following are some basic recommendations for selecting the proper liquid level switch material for your application. COMPONENT See Approvals pages in Reference Section Material Application 316 Stainless Steel For high-temperature (to 300˚C), high-pressure (to 300 PSIG) and corrosive conditions. Commonly used in food processing, medical,...

M Series Stainless Steel Liquid Level Switches Full-Size Switches Miniature Switches Side-Mounted Switches PP=Polypropylene f Also available in Polysulfone (consult factory) * Approval "D" does not apply to units with Slosh Shields a SPDT switch operation b Available with extended stem length, see drawing No. 19. Consult factory for appropriate model number. ** Refer to Approvals pages in Reference Section. Individual product explosion-proof (E) approvals vary. Consult factory for current product listings. *** Also available with a Thermocouple or RTD Madison Company • (203)488-4477 • (800)466-5383...

M Series Stainless Steel Liquid Level Switches Vertical Switches 1/4" NPT 1/4" NPT 1/4" NPT DWG No. 2 DWG No. 1 DWG No. 3 3.38" (85.8) 3.38" (85.8) 3.38" (85.8) 2.63" (66.8) 2.63" (66.8) 2" (50.8) 2.13" (54.1) dia. max. 1.50" (38.1) dia. max. (Polypro.) 1.25" (31.75) dia. max. (Buna-N) 2.38" dia. max. (60.4 mm) Cutaway Showing Slosh Shield Operation 2" dia. max. (50.8 mm) 2.05" (52.0) dia. max. Cutaway Showing Slosh Shield Operation 2.50" (63.5) 1.75" (44.4) 2.63" (66.8) 2" (50.8) 1/8" NPT 1/8" NPT Mounting by two 0.281" (7.1) dia. holes DWG No. 5 2.25" (57.1) 1.19" (30.2) DWG No. 4 1.13" (28.7)...

M Series Plastic Liquid Level Switches Full-Size Switches Miniature Switches Side-Mounted Switches PP=Polypropylene f Also available in Polysulfone (consult factory) * Approval "D" does not apply to units with Slosh Shields. 3 Not for use in hot water at temperatures above 65°C 6 SPDT switch operation ** Refer to Approvals pages in Reference Section *** Also available with a Thermocouple or RTD Madison Company • (203)488-4477 • (800)466-5383 • Fax (203) 481-5036 • [email protected] • www.madisonco.com LL-4 © Copyright Madison Company - 6/08 Al1 specifications are subject to change without notice....

M Series Plastic Liquid Level Switches Subminiature Switches t Also available in Polysulfone (consult factory) PP=Polypropylene ** Refer to Approvals pages in Reference Section Cutaway Showing Slosh Shield Operation Cutaway Showing Slosh Shield Operation Cutaway Showing Slosh Shield Operation Requires 0.91 mounting hole - Compression Gasket Madison Company • (203)488-4477 • (800)466-5383 • Fax (203) 481-5036 • [email protected] • www.madisonco.com All specifications are subject to change without notice. © copyright Madison Company - 10/10 LL-5

M Series Brass Liquid Level Switches Full-Size Switches Miniature Switches Side-Mounted Switches * SPDT switch operation PP=Polypropylene f Also available in Polysulfone (consult factory) ** Refer to Approvals pages in Reference Section Cutaway Showing Slosh Shield Operation Cutaway Showing Slosh Shield Operation Cutaway Showing Slosh Shield Operation Madison Company • (203)488-4477 • (800)466-5383 • Fax (203) 481-5036 • [email protected] • www.madisonco.com LL-6 © Copyright Madison Company - 1/06 A« specifications are subject to change without notice