FLT93B Level Switch

Level Switch Summary

The FLT93B BASIC insertion type FlexSwitch for level and temperature monitoring represents the first true technological breakthrough in thermal technology in over a decade. FCI is the only thermal manufacturer providing temperature compensation to ensure set point accuracy for process temperatures that vary up to ± 100° F. The FLT93B is easily field-configured, providing unparalleled flexibility, accuracy and stability for all multiple process sensing and switching requirements.

The FLT93B BASIC level switch is available with all of the below listed standard features for a very attractive price and with quick delivery as soon as 2 business days ARO.

For an operational demonstration of FCI's FLT93 FlexSwitch Series, please follow this link.


  • Interface and sump level detection
  • Interface/sump level detection in separation vessels
  • Agitation detection
  • Interface/level detection in settling vessels
  • Foam or sediment level control
  • Liquid/resin interface detection


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: Powder coated aluminum enclosure is rated for hazardous location use Groups B, C, D, E, F and G, CENELEC EEx d IIC and resists the effects of weather and corrosion per NEMA/CSA Type 4X (equivalent to IP66). Stainless steel is available as an option.
Agency Approvals: FM, CSA, CENELEC, ATEX with CE Mark.

Optional N.I.S.T. Flow Calibration Services
Factory N.I.S.T. calibration in air or water is available as an option for customer specified setpoint(s) or a flow curve based on the media ranges specified above

Flow Element

Materials of Construction: All welded 316L stainless steel for all wetted surfaces.
Process Connection: 0.75 inch male NPT
Insertion Length:
  • 1.2 inch [30 mm]
  • 2 inches [51 mm]
  • 4 inches [102 mm]

Operating Temperature: -40° to +350° F [-40° to +177° C]
Operating Pressure: To 3500 psig [240 bar(g)]

Control Circuit

Operation Temperature: -4° to +140° F [-20° 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.
Output Signal: Analog DC voltage related to flow or level/interface signal and proportional to temperature.
Electrical Connection: 1 inch female NPT