A float follows the liquid, and a wire-and-pulley system moves an indicator on a board outside the tank. It is simple to understand and easy to read from the ground.
A float follows the liquid, and a wire-and-pulley system moves an indicator on a board outside the tank. It is simple to understand and easy to read from the ground.
Because the reading is mechanical, it needs no power and no calibration, and it can be read from the ground on tanks too tall for a sight glass. For large tanks and vessels with liquids of specific gravity 0.6 or greater.
Every component can be specified independently to match the process fluid, the environment and the budget.
Major graduations every 1000 mm with 70 mm figures, minor every 100 mm with 40 mm figures, on a 150 mm board.
SS 304, SS 316, PP or PTFE floats, from general water and oil service through to aggressive chemical environments.
Guide wire, pulley housing, pulley, anchor plate and process connection are each specified separately.
A vacuum-seal variant is available where corrosive fluid vapour must be contained.
Applies to all variants unless otherwise specified
| Minimum fluid specific gravity | 0.6 |
|---|---|
| Gauge board width | 150 mm (6") |
| Minor graduation | Every 100 mm |
| Minor figure height | 40 mm (white) |
| Major graduation | Every 1000 mm |
| Major figure height | 70 mm (white stickers) |
| Float diameter | 300 mm (12") |
| Indicator | Red - MS powder coated · Aluminium - red powder coated |
| Guide wire | SS 304 (2 or 3 mm) · SS 316 (2 or 3 mm) · SS 304 PVC insulated · SS 316 PVC insulated · PP |
| Pulley housing | PP · Aluminium · SS 304 · SS 316 (customisable on request) |
| Pulley MOC | Nylon · SS 304 · SS 316 (customisable on request) |
| Spring assembly | 1" 150# MS powder coated · 1" 150# PP |
| Anchor plate | MS · SS 304 · SS 316 · PP |
| Process connection | Flanged as per ANSI B16.5 Class 150 |
| Process connection MOC | PP · HDPE · MS · SS 304 · SS 316 |
| Pipe section | Standard 400 mm × 2 and 200 mm × 1 (customisable on request) |
| Mounting clamps | Standard MS · SS 304 (only on request) |
| Scale mounting brackets | Standard MS · PP (only on request) · SS 304 (only on request) |
| Scale MOC | Aluminium - screen printed or laser printed · FRP - black, grey or yellow |
Vacuum-seal variant available for corrosive fluids. Float material and gauge board length are specified at the time of order.
All VI-FBI indicators share the same wire-and-pulley operating principle. The table below sets out the option against the service it suits.
SS 304 for general service in water, oils and mild process fluids. SS 316 for improved chloride and saline resistance. PP for acids, alkalis and general chemical service. PTFE for highly corrosive or aggressive chemical environments.
SS 304 in 2 or 3 mm for general service, SS 316 for saline or chloride-bearing environments. PVC-insulated variants where corrosive vapour is present, and a full PP build for highly corrosive media.
Share the tank height, medium, specific gravity and mounting details. We will work out the float, wire, pulley and board arrangement.