FLT93C Hygienic, Sanitary Flow Switch

Sanitary Finish Flow Switch

The FLT93C insertion and inline type flow switch is specifically designed for use in sanitary and hygienic process applications. Its 20Ra finish, available with either mechanical polish or electro-polish finishing, is suitable for applications 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.


  • Pump protection
  • Gas/Steam Injection Monitoring
  • Syrup Flow Monitoring
  • Non-Conductive Fluids
  • Additive Verification
  • Analyzer Flow Monitoring
  • Low Flow Detection


For Flow Service - Setpoint Range:
  • Water-based Liquids:
0.01 to 3.0 fps [0.003 to 0.9 mps]
  • Hydrocarbon-based Liquids:
0.01 to 5.0 fps [0.003 to 1.5 mps]
  • Air/Gas:
0.25 to 120 sfps [0.08 to 37 smps] at standard conditions of 70° F [21.1° C] and 14.7 psia [1.013 bar(g)].

Accuracy: (whichever reading is higher)
  • Liquids: ± 0.5% reading or ± 0.04 fps [± 0.012 mps]
  • Gases: ± 0.5% reading or ± 2 sfps [± 0.06 nmps]

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 or M20 metric conduit ports.

Compliances and Agency Approvals:  ATEX, IECEx, EAC/TR CU, Inmetro. CE mark. PED. Meets EC directives for EMC and LVD. 
ATEX: II 2 G Ex d IIC T6...T2 -40°C to 60°C Gb
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 77°C, T4
Tp (sensing element) = -40° to 177°C, 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 and Short Leg Tee Size
  • 1.17 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]

  • Operating Pressure: To 1500 psig  [103 bar(g)]

Control Circuit

Operating Temperature: -4° to +140° F [-20° to +60° C]

Universal AC/DC supply. Input terminals and jumpers on circut board select specific power.
AC 108-132V 13W, 100mA max.
AC 207-253V 14W, 50mA max.
AC 18-28V 7W, 230mA max.
DC 21-30V 7W, 230mA max.

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.


ATEX  CE  EAC  IECEx  Inmetro  SIL