FLT93C Level Switch

Liquid Level Switch for Sanitary Processes

The FLT93C insertion and inline type FlexSwitches are designed specifically for liquid point level detection and temperature alarm in sanitary process applications. It's 20 Ra finish makes it suitable for use in food, beverage, pharmaceutical and other clean processes.  FCI is the only thermal manufacturer providing temperature compensation to ensure set point accuracy for process temperatures that vary up to ± 100° F. The FLT93C is easily field-configured or factory preset, providing unparalleled flexibility, accuracy and stability for all multiple process sensing and switching requirements.


  • 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: NEMA 4X/IP66 Rated. Standard: Polyester power coated aluminum, with single 1" NPT conduit port. Optional: Stainless steel. Optional: Dual-conduit port, aluminum with 1/2" NPT pr M20 metric conduit ports.

Compliances and Agency Approvals: FM, FMc, ATEX, IECIx, EAC/TR CU, Inmetro. CE mark. PED, CRN.
Meets EC directives for EMC and LVD. Complies with Canadian Electrical code requirements of ANSI/ISA 12.27.01-2011 as a single seal device.
FM/CSA/FMc: XP, Class 1, Div. 1 Groups B,C,D
DIP, Class II/III, Div. 1, Groups E,F,G
T4, Ta = 60°C, T3A, Ta = 60°
ATEX: II 2 G Ex d IIC T6...T2 (effective Nov. 2014)
IECEx Ex d IIC T6 or T5
Tamb (housing) = -40° to +40°C, T6
Tamb (housing) = -40° to +60°C, T5
Tp (sensing element) = -40° to 177°C, T4/T2
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 electro-polished to 20 Ra for all wetted surfaces.

Process Connection: Sanitary flange

Insertion Length:
  • 1.37 inch [35 mm] for 0.75 inch Tee
  • 1.25 inch [32 mm] for 1 inch Tee
  • 1.93 inch [49 mm] for 1.5 to 2 inch Tee
  • 2.75 inch [70 mm] for 3 to 4 inch Tee
  • Customer specified lengths are available as an option.

Operating Temperature:
  • Standard: -4° to +350° F [-20° to +177° C]
  • Optional: -100° to +500° F [-73° to +260° C] or -100° to +850° F [-73° to +454° C]

Operating Pressure: To 2000 psig [138 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

Remote Configuration: Available as an option with customer specified interconnecting cable length.