E+h Application Area Liquipoint FTW31 for Limit Level Detection of Conductive Liquids

What is Liquipoint FTW31

The Liquipoint FTW31 is a conductive pointlevel detector (point level switch) designed for liquids that conduct electricity. It’s used to detect when the liquid reaches a certain level (or multiple levels) in a tank or vessel — for example: overfill protection, dry-run protection of pumps, controlling pump start/stop between two levels, etc.

Unlike continuous level sensors, it detects at specific points (electrodes/rods) rather than giving the whole level profile.

How it Works (Measuring Principle)

• It uses conductive probing electrodes (rods). The liquid must be conductive (minimum conductivity required) so that when the liquid touches the probes, a circuit completes via the liquid, signalling that level is reached.
• The FTW31 can have multiple switching points on a single probe: up to 5 rods/electrodes ‒ meaning you can detect multiple distinct levels with one probe.
• There are no moving parts, which helps reduce wear and maintenance.

Key Specifications

Here are the typical technical data you should know about:

Advantages

Some of the benefits of using FTW31:

• Multipoint detection with one probe: Up to 5 switch points allow you to monitor several levels with one sensor. Saves cost and simplifies installation.
• Simple, robust construction: No moving parts → more reliable, less wear, less maintenance.
• No calibration required for many common conductive liquids; standard settings are provided.
• Wide temperature and pressure range suitable for many industrial processes.
• Good for safety applications like overfill prevention, dry-run protection, etc.

Limitations & Considerations

Things to check / watch out for:

• The liquid must have sufficient conductivity (at least ~ 10 µS/cm). If the liquid is very pure (low ion concentration) and non-conductive, the detector may not work reliably.
• Build-up or deposition on the electrodes (scale, sludge, etc.) can affect performance. If the probes are coated or partially insulated, detection may be delayed or false.
• Multiple rods means multiple exposed points; electrical insulation and mounting must prevent false triggering via unintended paths (e.g. via tank wall, mounting brackets, or condensation).
• In aggressive or corrosive liquids, material compatibility (electrode/stem housing) is important.
• Safety/environmental/explosion certifications must match the application when in hazardous areas. FTW31 offers these, but the specific version and installation must comply.

Liquipoint FTW31 level transmitter

conductive liquid level detection

limit level detection transmitter

E+h Application Area Liquipoint FTW31 for Limit Level Detection of Conductive Liquids Images