01
Standard MLI
VI-MLI-SFlanged float cage with red/white rotating bi-colour indicator strip. Float and cage metallurgy to order.
No power required
A permanent-magnet float drives the indicator strip without any external power supply.
VI-MLI Series
Magnetic Level Indicator
See the liquid level without opening the vessel and without supplying power. A float inside the chamber moves magnetic indicators outside it, keeping the process sealed.
- Maximum liquid temperature
- 450 °C
- Rated pressure
- 20 kg/cm²
- Centre-to-centre
- 6000 mm
- Measuring accuracy
- ± 5 mm
Overview
Continuous level indication without power
See the liquid level without opening the vessel and without supplying power. A float inside the chamber moves magnetic indicators outside it, keeping the process sealed.
Because process fluid is fully contained in the float cage, the instrument is preferred wherever sight glass safety is a concern, and across demanding applications in petrochemical, refinery, pharmaceutical, chemical and oil-storage plant.
Four configurations cover basic indication, switch output, 4~20 mA transmission and top-mounted installation.
Gas-tight separation
Process medium stays fully enclosed in the cage, so indication stays safe even on hazardous fluids.
Wide material choice
Float and cage in SS304, SS316, PTFE, PP, PVC or PVDF to match the medium.
Add-on sensing
Level switches and 4~20 mA transmitters mount directly to the cage without process entry.
General performance parameters
Applies to all variants unless otherwise specified
| Float & cage material | SS304, SS316, PTFE, PP, PVC, PVDF |
|---|---|
| Max. centre-to-centre distance | 6000 mm; greater lengths on request |
| Connecting flanges | DIN or ANSI B16.5 |
| Rated pressure | 20 kg/cm² (SS); 3 kg/cm² (PP, PVC, PVDF); higher ratings on request |
| Max. liquid temperature | 450 °C (SS); 80 °C (PVDF); 60 °C (PVC); 50 °C (PP) |
| Minimum specific gravity | 0.5 |
| Scale | Standard graduated in cm; mm also available. ABS or SS304 |
| Measuring accuracy | ± 5 mm |
| Indication | Red-White or Yellow-Black rotating flappers |
| Mounting | Side-side or top mounted |
Roller material determines temperature limit: plastic rollers to 100 °C, aluminium rollers to 250 °C, ceramic rollers to 450 °C. Electronic indicators with single or double set-point relays are available as an option.
Models and variants
Four configurations, one cage.
All groups share the same float cage and indicator strip. Choose the standard group for visual-only readout. Add the switch group where a relay output is needed for alarm or control. Specify the transmitter group when a 4~20 mA signal to a DCS or PLC is required. Select the top-mounted group when side connections to the vessel are not available.
02
MLI with Level Switch
VI-MLI-SWOne or more magnetic reed or proximity switches fixed to the float cage. Single or dual set-point relay output.
03
MLI with Transmitter
VI-MLI-TMagnetostrictive or reed-chain transmitter rail mounted along the float cage. Continuous 4~20 mA level signal.
04
Top Mounted MLI
VI-MLI-TMTop-entry float and cage with indicator strip mounted externally. Suited to vessels with limited side access.
Tell us about the vessel
Share the medium, specific gravity, temperature, pressure and centre-to-centre distance. We will confirm the float material, chamber and indication option.
- Fluid, specific gravity and concentration
- Flow or level range, and line size
- Operating pressure and temperature
- Material of construction and end connection
- Output, display and area classification