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Conductivity Switches
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RELATED PAGES: Relays & Controllers | Product Selection Guide | Temp. Sensors | Reference | Install Manuals
Conductivity Switch for heavy-bodied or semisolid liquids
Model M3784: has no moving parts to avoid operation failure in semisolid liquids, industrial slurries and heavy-bodied liquids

M Series
Conductivity Switch for heavy-bodied or semisolid liquids

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
NPT fitting (bulkhead or flange-type fitting available)
One to three electrodes, depending on tank material and number of functions required
Electrodes are 1/8" dia. 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"
Standard Models:
MODEL NO. VOLTAGE
M3784-12 12 AC
M3784-110 110 AC
M3784-220 220 AC
M3784-2 no controller
Conductivity Switch Kit
Also Available:
Conductivity Switch Kit
M3784-110MK
Specifications:
Sensing Head
R2 Conductivity Controller
R2 Conductivity Configuration
120 VAC is connected between pins 2 and 7
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 or pump.
For single level control, connect probe to pin 8 and use pin 5 as the return.
Output Contact Rating
(1-3 or 1-4)
5A @ 220 VAC
10A @ 120 VAC
10A @ 30 VDC
Electrodes 24" length, standard
72" length, maximum (with two extensions)
May be cut to custom length
Materials 316 Stainless Steel electrodes
Polypropylene all food-grade materials
Mounting 1" NPT, standard
Bulkhead or snap-in flange optional
Pressure 30 PSIG, maximum
Temperature 100°C, maximum (212°F)
Other Integral junction box with IP68 (NEMA 6) protection 10' cable for attaching sensing head to controller
 
Controller
Model No. R2-120
Sensing Inputs 3 maximum (High, Low, Common)
Sensing Voltage 12 VAC
Sensing Resistance 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
Options:
Electrode extensions, two each, 24" length, with coupling nuts and electrode spreader
Single electrode fitting with 24" electrode
Additional Downloads:
M3784 Conductivity Sensor Head Installation Instructions (PDF)
Conductivity Probe Kit M3784-110MK Add-On Electrode Installation Instructions (PDF)
All specifications are subject to change without notice.
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