Models T20 & T21 top-mounting single-stage and dual-stage float switches
Single Stage Switch
T20 units are simple, reliable float switches, designed for top mounting into tanks or vessels. T20 units utilize a single switch mechanism and float. It can be used for virtually any type of open or closed process or storage vessel, with either threaded or flanged type mounting, and actuating depths of up to 48 inches (1219 mm).
Dual Stage Switch
T21 units combine the functions of two separate narrow differential level controls in a single, compact, easy-to-install instrument. Two independent switch mechanisms are employed to provide two actuating levels at least 8” apart, at actuating depths of up to 48 inches (1219 mm), for applications such as high and low level alarm operation. Model T21 tandem float switches are available with optional cages to help stabilize the floats under turbulent conditions.
Technology
Float level switches
All float operated liquid level controls operate on the basic buoyancy principle which states "the buoyancy force action on an object is equal to the mass of liquid displaced by the object." As a result, floats ride on the liquid surface partially submerged and move the same distance the liquid level moves. Because of this, they are normally used for narrow level differential applications such as high level alarm or low level alarm.
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Features
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Applications
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Operating principle
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Approvals
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Downloads
- Float diameters of 3" × 5", 4" and 4½" available
- Tank connections available in 1" NPT, cast iron, forged, or stainless steel flanges
- Choice of switch mechanism: ◦ Dry contact ◦ Hermetically sealed ◦ Pneumatic
- Choice of switch enclosure: ◦ NEMA 1 carbon steel for pneumatics
◦ TYPE 4X/7/9 Class I, Div. 1, Groups C & D, polymer coated aluminum
◦ TYPE 4X/7/9 Class I, Div. 1, Group B, polymer coated aluminum
Options
- NACE
- ATEX approved housing
- Housing heater
- Float guide cage
- Tropicalized switch mechanism
- Special flange face finishes
- Submersible housing
- Elevated temperature
| ATEX | Ex d, Ex ia |
|---|---|
| CCOE | Ex d |
| CSA | XP |
| FM | XP |
| EAC (GOST) |
Ex d, Ex ia |
| IEC | Ex d, Ex ia |
| Inmetro | Ex d |
| Korea |
Ex d |
| NEPSI |
Ex d |
| SIL |
SIL 2 (1oo1) |
Other approvals are available. Consult factory for more details.
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Approvals and certificates
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Instruction Manuals
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Product Catalogs
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