Magnetic level switch type B933
The ATEX certified level switch II 2 G EEx d II C is a reliable solution for level control in potentially explosive atmospheres. The ATEX level control exploits the buoyancy of a hollow steel ball, pivoted on a rod, which activates a magnet that in turn triggers a contact. UNICA CE Italy level switches are known worldwide for their maximum degree of reliability, guaranteed by the frequent validation activities they undergo.
- Explosion-proof enclosure
- Easy installation, quick assembly of rod and float
- Adjustable-length, foldable rod
- Horizontal, inclined or vertical mounting
- Float passing through a DN 50 hole
- Spacious electrical enclosure for easy wiring
- Easy electrical maintenance with the instrument installed
- Asbestos-free gaskets
- Floats available in 120 mm or 160 mm diameter with rod adapter
- Quick-release float coupling for fast maintenance and/or cleaning
- Accepts 2 switching micro-switches
Application fields: process industries, chemical and petrochemical industries, water and solvent treatment.
Certified products
Technical characteristics
| Max pressure | 12 bar |
|---|---|
| Liquid-contact material | AISI 316 |
| Enclosure material | Aluminium |
| Cable gland hole | GK 1/2'' |
| Flange fit | DN 50 - PN10 |
| Float size | D 53 x 140 mm |
| Rod size | D 5 x 200 mm |
| Weight | 2,950 g |
| Allowed ambient temperature | -20°C to +40°C |
| Protection degree | II 2 G EEx d II C T6 to T3 |
| Max voltage | AC 125/250 V 50/60 Hz |
| Max AC current | 5 A |
| Number of micro-switches accepted | Up to 2 |
Variants
- Ø120 mm float with rod adapter
- Ø160 mm float with rod adapter
- Horizontal, inclined or vertical mounting
Frequently asked questions
Yes, the mod. B933 is ATEX certified II 2 G EEx d II C, with temperature class from T6 to T3 (certificate CEC 13 ATEX 009 X), suitable for installation in Zone 1 and Zone 2 of process, chemical and petrochemical plants.
The B933 is designed for level control of process liquids up to a maximum pressure of 12 bar, with liquid-contact parts in AISI 316 stainless steel, also suitable for corrosive fluids or solvents.
Yes, the float is available in two diameters, Ø120 mm or Ø160 mm, both supplied with a rod adapter, to suit different liquid densities and mounting conditions.
The B933 can be mounted horizontally, at an incline or vertically, with the float passing through a DN 50 hole and a DN 50 - PN10 flange. The rod is adjustable in length and foldable to ease transport and installation in tight spaces.
No, the spacious electrical enclosure and the quick-release float coupling allow electrical maintenance and float cleaning with the instrument still installed, reducing plant downtime.
The level switch accepts up to 2 switching micro-switches, so a single instrument can manage, for example, one alarm threshold and one control threshold for a pump or valve.