Tank Level Switches
A tank level switch is a point level device that, through a mechanical float arm, operates a microswitch to start or stop a pump or raise an alarm when the liquid reaches the set point. It is mounted horizontally on the tank side wall.
The threaded compact type with ¾”–1″ BSP connection suits small tanks, while the flanged type with cast aluminium housing is designed for pressurised and hot tanks. Spare floats and rotary-type switches are also in the store range.
Main Applications
- Pump control on water and fuel tanks
- Condensate and feed water tanks
- High-low alarms on process tanks
- Booster and expansion tanks
- Cooling tower basins
Technical Data
| Operation | Float arm + microswitch |
|---|---|
| Threaded type connection | ¾” – 1″ BSP |
| Threaded type body | Brass; ABS plastic or stainless cover |
| Threaded type limits | 125 °C, 6 bar |
| Flanged type housing | Cast aluminium, IP66 |
| Flanged type limits | 150 °C, up to 16 bar (by model) |
| Float | Stainless AISI 316L |
| Microswitch | 16 A; max. 480 V AC/DC on flanged type |
| Contact | NO / NC; single or double switch on threaded type |
| Switching range | Threaded 15–90 mm, flanged 20–180 mm |
Material Options
| Part | Threaded compact type | Flanged type |
|---|---|---|
| Body | Brass | Cast aluminium |
| Cover | ABS plastic or stainless | Aluminium (IP66) |
| Float | AISI 316L | AISI 316L |
| Connection | ¾” – 1″ BSP | Flange (stainless or carbon steel) |
Which material? The switching range decides how often the pump starts and stops; a narrow range makes the pump cycle frequently. Two separate switches are used for a wider range.
Advantages
Heavy-Duty Contact
- 16 A microswitch
Two Body Options
- Threaded compact and flanged
Suits Hot Tanks
- 150 °C on flanged type
Simple and Rugged
- Mechanical operation, no electronics
Construction and Design Features
- Float arm reaching into the tank
- Mechanism transmitting arm movement to the switch
- Microswitch inside the housing
- Threaded or flanged tank connection
Write the tank pressure, temperature and connection type; we will confirm the right level switch together with its spare float.
How to Choose?
- Set pressure and temperatureChoose threaded below 6 bar and 125 °C, flanged above.
- Select the connectionPick the thread size or flange for the tank nozzle.
- State the contact needChoose NO, NC or a double switch for pumps and alarms.
- Plan the rangeUse two switches for a large level difference.
Complementary Products
Why ORFA?
Other Level Control Devices
Alarm and Remote Monitoring Devices
Alarm and remote monitoring devices report the level status in tanks and wells by audible, visual or remote notification.
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Glass Tube Level Gauge
Glass tube level gauges allow the liquid level inside a tank to be seen directly through a transparent glass tube.
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Electric Level Float Switches
Electric level float switches float with the liquid level, change contact and operate a pump or alarm.
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Hydrostatic Level Transmitters
Hydrostatic level transmitters measure level from the pressure of the liquid column and provide a continuous signal.
Details →Capacitive Level Sensors
Capacitive level sensors detect the level of liquids and solids by changes in capacitance.
Details →Solids Level Switches
Solids level switches detect the level of powder and granular materials in silos and bunkers.
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Boiler Proportional Level Controllers
Boiler proportional level controllers continuously measure the water level in steam boilers and adjust the feed water proportionally.
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Boiler Level Switches
Boiler level switches detect low and high water levels in steam boilers and control the burner, pump or alarm.
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Boiler Feed Water Level Controls
Boiler feed water level controls start and stop the feed pump according to the water level in the steam boiler.
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Magnetic Level Indicators
Magnetic level indicators show the tank level by transferring the movement of a magnetic float to external indicator flaps.
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Magnetic Level Transmitter
Magnetic level transmitters convert the position of a magnetic float into a continuous electrical signal.
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Stainless Steel Level Switch
Stainless steel level switches are float level switches with stainless steel bodies suitable for corrosive and hot liquids.
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Plastic Level Switches
Plastic level switches are economical float switches used in water and mild chemical tanks.
Details →Radar Level Transmitters
Radar level transmitters measure the level of liquids and solids without contact and provide a continuous signal.
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Reflex Glass Level Gauges
Reflex glass level gauges show the liquid level clearly in steam boilers and pressure vessels.
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Level Indicators
Level indicators allow the liquid level in tanks and vessels to be monitored on site.
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Level Control Panels and Sensors
Level control panels and sensors are control systems that automatically start and stop pumps according to the level in tanks and wells.
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Liquid Level Electrodes
Liquid level electrodes detect the level of conductive liquids by electrode contact and send a signal to the level relay.
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Float Level Switches
Float level switches change contact by means of a float moving with the liquid level and control a pump or alarm.
Details →Float Valves
Float valves open when the water level in a tank drops and close when it is full, keeping the level mechanically.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.