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Environmental Considerations
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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.
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| Material |
Application |
| 316 Stainless Steel (SS) |
For high-temperature (to 300°C), high-pressure (to 300 PSIG) and corrosive conditions. Commonly used in food processing, medical, heating and cooling equipment. |
| Polypropylene (PP) |
For acidic conditions, such as found in electroplating and metal cleaning. Another choice for lower-temperature (to 105°C) food processing applications (Madison Company uses only polypropylene that is FDA-approved for food contact). Also a good choice for general-purpose applications in commercial or consumer appliances and equipment. |
| Polysulfone (PSU) |
A hydrolysis-resistant material for continuous use in hot water and steam, at temperatures up to 148°C. High chemical resistance to acidic and salty solutions and good resistance to detergents. Commonly used for analytical instrumentation, medical devices and semiconductor process equipment components. Food-grade material available with FDA, NSF, 3A-Dairy and USP Class VI compliance, upon request. |
| Brass |
The selection for petroleum-based liquids, such as lubricating oils, gasoline and diesel fuels. Widely used in storage tanks of vehicles, generators, transmissions and hydraulic systems. Other uses are in lubrication, recovery, refining and fuel processing equipment with temperatures up to 130°C. |
| Buna-N (Nitrile) |
Suitable for use with aromatic hydrocarbons, dilute acids and bases with a temperature range of -50°C to 120°C. Applications include fuel tanks, transmissions and hydraulic systems. |
PBT
(Polybutylene
Terephthalate) |
A strong and highly crystaline plastic featuring good dimensional stability. Generally serves where temperature resistance and permeability are not important. Ideal for applications such as fuel and hydraulic systems with continuous service at 120°C.
Please note: PBT is not suitable for use in temperatures above 130°C. |
| Kynar |
Chemical- and solvent-resistant properties make this material a problem solver for many applications. Its high purity nature is ideal for food handling and sensitive laboratory or test equipment with temperatures up to 105°C. |
| PTFE (Teflon®) |
This material is ideal for acids, alkalis, oils and gasoline applications where temperatures are up to 260°C. Temperature-stable and chemical-resistant, with a very low coefficient of friction. |
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Madison Company also manufactures selected switch models in a combination of materials that are available from stock or in a custom, build-to-order configuration.
Once a suitable material has been selected, the type of switch and configuration of actuation points, fittings and wire terminations are the next considerations. Madison Company stocks a full line of standard products that can meet the requirements of many applications. For specific designs, Madison can custom build, to order, switches with an infinite number of variations and options.
Teflon® is a registered trademark of E.I. du Pont de Nemours and Company
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| Turbulence |
| Intensive agitation of liquid, boiling fluids and surging due to large inflows of liquid can all cause turbulence and erratic float switch operation. This problem can be eliminated by the use of slosh shields with adequately-sized fluid and vent holes, as illustrated here. Available for vertical, horizontal (side-mounted) and multi-point switches with full-size or miniature floats, these slosh shields can be supplied in stainless steel, brass, polypropylene, PBT or Kynar. |
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| General Product Guide – Selected Standard Switches |
| IN STOCK |
Build to Order |
Typical Applications |
| Mounting: |
Side Mount |
Vertical Mount |
| Material Type |
Single Thread |
Dual Thread |
Full-Size Float |
Miniature Float |
Submin. Switch |
Multi-Point Switch |
| Standard Switch |
Power Reed Switch |
| 316 Stainless Steel |
M5010
M5970
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M5900
M5910
M5920 |
M5600
M5917
(others) |
M5600-PR
(others) |
M5000
(others) |
N/A |
M5602
M5002
(w/ options) |
High temperature,
High pressure,
Corrosive conditions |
| Brass & Buna-N |
M4010 |
N/A |
M4300
(others) |
N/A |
M4500
(others) |
N/A |
M4302
M4502
(w/ options) |
Lubricating oils,
Hydraulic fluids,
Gasoline and diesel fuels |
| PBT & Buna-N |
N/A |
N/A |
M7800
(others) |
N/A |
M7000 |
N/A |
N/A |
All Plastic,
Lubricating oils,
Hydraulic fluids,
Gasoline and diesel fuels |
| Kynar |
M9750 |
M9700 |
M9800 |
N/A |
M9000 |
N/A |
M9802
M9090
(w/ options) |
Chemical resistant,
High-purity applications |
| Polypropylene |
M8750
M8790
M8725 |
M8700
M8740 |
M8800
(others) |
M8800PR
(others) |
M8000
(others) |
M3326 |
M8802
M8080
(w/ options) |
General purpose,
FDA approved for food use, Acidic conditions |
| PBT (Polybutylene Terephthalate) |
M7750
M7790
M7725 |
M7700
M7740 |
N/A |
N/A |
N/A |
N/A |
N/A |
All plastic, Lubricating oils, Hydraulic fluids, Gasoline and diesel fuels |
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N/A - Not Available
Slosh Shields for turbulence protection available on most switches.
Other material combinations, submersibles and specialty switches are available. |
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