FLT93M Level Switch

Insertion Level Switch for High Temp and Pressure Environments

The FLT93M insertion type FlexSwitch for multipoint level monitoring represents the first true technological breakthrough in thermal technology in over a decade. This product was designed for heavy industrial environments including high temperature and high pressure. FCI is the only thermal manufacturer providing temperature compensation to ensure set point accuracy for process temperatures that vary up to ± 100° F. The FLT93M is easily field-configured or factory preset, providing unparalleled flexibility, accuracy and stability for all multiple process sensing and switching requirements.


  • Tank level monitoring
  • Sump level monitoring
  • Mixing level/interface monitoring


For Level/Interface Service:
Accuracy: ± 0.25 inch [± 6.4 mm]
Repeatability: ± 0.125 inch [± 3.2 mm]

For Temperature Service:
Accuracy: ± 2° F [± 1° C]
Repeatability: ± 1° F [± 0.6° C]

Response Time: As low as 3 seconds

Enclosure: Aluminum enclosure is rated for hazardous location use (Class I and II, Division 1 and 2, Group B, C, D, E, F and G; and EEx d IIC) and resists the effect of weather and corrosion (NEMA and CSA Type 4X and equivalent to IP66).

Agency Approvals: Contact FCI.

Flow Element

Materials of Construction: 316 stainless steel tubing for all wetted surfaces. Hastelloy C is available as an option.

Process Connection: 2 inch diameter tubing with 4 inch 150 lb raised face flange

Insertion Length: Customer specified up to 25 feet [7620 mm]

Operating Temperature:
  • Standard: -4° to +350° F [-20° to +177° C]
  • Optional: -100° to +500° F [-73° to +260° C]

Operating Pressure: To 3500 psig [240 bar(g)]

Control Circuit

Operating Temperature: -40° to +140° F [-40° to +60° C]

Input Power: Field selectable 115 ± 15 Vac or 230 ± 30 Vac, 50/60 Hz; 21 to 28 Vdc or 18 to 26 Vac; 7 watts maximum.

Relay Contacts: Field configurable dual SPDT or single DPDT rated 6 amps at 115 Vac, 240 Vac or 
24 Vdc. Hermetically sealed relays are available as an option.

Output Signal: Analog DC voltage related to flow or level/interface signal and proportional to temperature.

Electrical Connection: 1 inch female NPT