M Series Single-Point Probe Conductivity Sensor for Food Applications The M3850 is a small, low-cost sensor designed for food applications in metal-walled tanks or vessels. Installation is simple, and they can be wired in phase so that multiple level points can be detected. All materials are food-grade, and the contours of the insulator shell meet NSF requirements for cleaning. While a conductivity switch and a float-type switch perform 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. The probe is mounted with an insulator shell for sensing in such liquids. With no moving parts, switch operation of the M3850 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. M3850 Madison supplies a basic controller with the M3850 that will satisfy a broad range of applications. Because conductivity varies widely among liquids, the controller is adjustable for sensitivity in different liquids. Consult factory for details on a specific liquid. Features • • • • • • • Small size Low cost Sensitivity-adjustable controller No moving parts Safe operation Made entirely of food-grade materials Can be used for multiple level indication Madison Company • (203) 488-4477 • (800) 466-5383 • Fax (203) 481-5036 • [email protected] • www.madisonco.com © Copyright Madison Company – 2/05 CD-1 CD

Sensing Head Available Mounting Tank Wall Sensing Inputs Sensing Voltage Sensing Resistance 5 Amps res. @ 240 VAC, form SPDT Socket mount; socket is DIN Three M3850 units in phase HIGH LEVEL NOTE: DRAWING FOR PUMP UP OPERATION. TO CHANGE TO PUMP DOWN, WIRE PUMP TO TERMINAL 3 ON CONTROLLER INSTEAD • Wire the Common Probe to pin 5 • Wire the Lower Probe to pin 6 • Wire the Upper Probe to pin 8 Pins 1-3 and 1-4 are isolated switch contacts to switch power to a valve For single level control, connect probe Output Contact Rating All specifications are subject to change without notice. Sensor solutions...