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Conductivity Switch (M3784)

Conductivity Switch (M3784)
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M Series Conductivity Switch Madison Company’s conductivity switch is the current choice for heavy-bodied or semisolid liquids. Madison supplies a basic controller with the M3784 that will satisfy a broad range of applications. Because the conductivity varies widely among liquids, the controller is adjustable for sensitivity in different liquids. Consult factory for details on specific liquids. While a conductivity switch and a float-type switch provide the same functions, the advantage of no moving parts is that the conductivity switch can be used in several environments that would cause a float to stick or to not operate at all. These would include semisolid liquids like food industry and industrial slurries or heavy-bodied liquids like wastewater. With no moving parts, switch operation of the M3784 is not interrupted. Only an extremely small amount of current is necessary for the unit to perform. As with any device, a properly installed and grounded system poses no electrical hazard. Features • Sensitivity-adjustable controller • No moving parts • Safe operation • Controls up to two levels with controller M3784 • NPT fitting (bulkhead or flange-type fitting available) Model No. Voltage M3784-12 M3784-110 M3784-220 M3784-2 12 AC 110 AC 220 AC no controller For installation instructions, please visit www.madisonco.com • One to three electrodes, depending on tank material and number of functions required • Electrodes are 1/8” diameter 316 Stainless Steel; all wetted materials are food-grade • Standard 24” electrode can be cut by end user to shorter length; two 24” extensions can be added for a maximum recommended length of 72” Madison Company • (203) 488-4477 • (800) 466-5383 • Fax (203) 481-5036 • info@madisonco.com • www.madisonco.com © Copyright Madison Company – 2/05 CD-3 CD

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Specifications Sensing Head Electrodes 1 Materials 316 Stainless Steel electrodes Polypropylene all food-grade materials Mounting 2 100˚C, maximum (212˚F) Other 5 Common Probe 12 VAC Adjustable to 100,000 Ohms Input 120 VAC 50/60 Hz Output Contact rating 5 Amps resistive @ 240 VAC, form SPDT Mounting Socket mount, socket is DIN rail-mountable R2 Pins 1-3 and 1-4 are isolated switch contacts to switch power to a valve or pump. 3 maximum (High, Low, Common) Sensing Resistance Upper Probe • 120 VAC is connected between pins 2 and 7 • Wire the Common Probe to pin 5 • Wire the Lower Probe to pin...

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