Technical Characteristics and Extreme Durability
-
Unmatched Mechanical Strength: The sword version of the FTI77 is designed to withstand lateral forces of up to 800 Nm. This allows it to be installed in the direct path of heavy falling material or in silos where massive internal shifting occurs.
-
High Temperature Resistance: With an operating range reaching +400°C, this sensor is ideal for “hot” processes in the cement, glass, and metal industries that exceed the limits of standard level switches.
-
Active Build-up Compensation: Even when measuring materials that are prone to caking or crusting due to heat and moisture, the FTI77 maintains accuracy. Its advanced electronics compensate for material build-up on the probe, ensuring it only switches when the actual bulk level is reached.
-
Abrasive Media Protection: The probe construction is optimized for abrasive environments. The materials used for the sensing element are chosen to resist the constant “sandblasting” effect of coarse-grained solids.
-
Static Discharge Immunity: To protect the sensitive electronics from the massive static charges generated in dry bulk silos, the FTI77 includes a high-grade, two-stage overvoltage protection system.
-
Safety Integrated: The device is certified for use in safety-related systems up to SIL2 (and SIL3 with redundant configuration), making it suitable for high-risk overfill prevention applications.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Capacitance (Point Level) |
| Max. Lateral Load | 800 Nm (Sword version) |
| Probe Length (Sword) | 200 to 4,000 mm (8 to 157″) |
| Probe Length (Rope) | 500 to 20,000 mm (20 to 787″) |
| Process Temperature | -50 to +400 °C (-58 to +752 °F) |
| Process Pressure | -1 to +10 bar (-14.5 to +145 psi) |
| Output | Relay DPDT, 2-wire PFM, 3-wire PNP |
Primary Applications
-
Cement and Steel Production: Monitoring hot clinker, raw meal, or slag in high-temperature silos and discharge chutes.
-
Power Generation: Level detection in coal bunkers or hot fly ash silos where both heat and abrasion are present.
-
Mining and Primary Processing: Handling heavy, abrasive ores and minerals that exert high lateral forces during silo filling.
-
Foundries and Glass Works: Measuring hot sand, cullet, or additives in high-heat processing zones.
-
Safety-Critical Overfill Prevention: Using the SIL2/SIL3 capabilities to provide a reliable emergency high-level alarm for hazardous bulk materials.
