FLT93S Level Switch


The FLT93S insertion type FlexSwitch for level and temperature 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 FLT93S is easily field-configured or factory preset, providing unparalleled flexibility, accuracy and stability for all multiple process sensing and switching requirements.


  • Brand


Fluid Components FCI


  • 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 or M20 metric conduit ports.

Compliances and Agency Approvals: FM, FMc, ATEX, IECEx, EAC/TR CU, Inmetro, EQM/ECAS. CE mark. PED, CRN. (UKCA, UKEX pending)
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/FMc: XP, Class 1, Div. 1 Groups B,C,D, T3A or T4 Ta ≤60°C
DIP, Class II/III, Div. 1, Groups E,F,G, T3A or T4 Ta ≤60°C
Nonincendive for Class I, II and III, Division 2, Groups A,B,C,D,E,F, and G, T3A or T4 -40°C ≤Ta≤60°C; hazardous (classified) locations, indoors and outdoors.
Type 4X
ATEX: Integral:                        II 2 G  Ex db IIC T4…T2 Gb
II 2 D  Ex tb IIIC T135°C…T300°C Db
Remote enclosure
+ electronics:             II 2 G  Ex db IIC T6 Gb
II 2 D  Ex tb IIIC T85°C Db
Local enclosure
+ sensor                     II 2 G  Ex db IIC T4…T1 Gb
II 2 D  Ex tb IIIC T135°C…T345°C DbPigtail version            II 2 G  Ex db IIC T4…T3 Gb
II 2 D  Ex tb IIIC T135°C…T200°C Db
Integral:                        Ex db IIC T4…T2 Gb
Ex tb IIIC T135°C…T300°C Db
Remote enclosure
+ electronics:             Ex db IIC T6 Gb
Ex tb IIIC T85°C Db
Local enclosure
+ sensor                     Ex db IIC T4…T1 Gb
Ex tb IIIC T135°C…T345°C DbPigtail version            Ex db IIC T4…T3 Gb
Ex tb IIIC T135°C…T200°C Db

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. Hastelloy C, 
Monel 400 and Titanium are available as an option.

Process Connection: 

  • Standard: 0.75 inch male NPT.
  • Optional: 1 inch male NPT, flanges or retractable sensing element.

Insertion Length:

  • 1.2 inch [30 mm]
  • 2 inches [51 mm]
  • 4 inches [102 mm]
  • 6 inches [152 mm]
  • 9 inches [229 mm]
  • 12 inches [305 mm]
  • 18 inches [457 mm]
  • 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 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
Remote Configuration: Available as an option with customer specified interconnecting cable length.


  • ATEX
  • CE (Surface Mount Electronics)
  • FMc (Surface Mount Electronics)
  • IECEx
  • Inmetro
  • UKCA/UKEX (pending)
  • SIL 2 (Surface Mount Electronics)
  • SIL 2 (Through-Hole Electronics)
  • SIL (TUV)
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