The product
External cage switches technology
A permanent magnet is attached to a pivoted switch actuator. As the float/displacer rises following the liquid level, it raises the attraction sleeve into the field of the magnet, which then snaps against the non-magnetic enclosing tube, actuating the switch. The enclosing tube provides a static pressure boundary between the switch mechanism and the process. On a falling level, the float/displacer deactivates the switch.
Features
- Choices of chamber materials include carbon steel, stainless steel and chrome-moly
- 300 series stainless steel float
- Choice of switch mechanism: ? Dry contact ? Hermetically sealed
- Minimum specific gravity 0.65
- Choice of switch mechanism enclosure: ? TYPE 4X polymer coated steel ? TYPE 4X/7/9 Class I, Div. 1, Groups B, C & D, polymer coated aluminum or cast iron
- Choice of tank connection: ? 1″ welding nipples ? 1″ or 1½” socket welds
Options
- ATEX housing
- Flanged connections
- Temperature extensions
- Low specific gravity
Operating principle
As the counter weighted float follows liquid level changes, a magnetic sleeve is moved into or out of the field of a switch-actuating magnet causing switch operation. A non-magnetic barrier tube isolates the switch mechanism from the controlled liquid
Approvals
| ATEX | Ex d |
| 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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