Flow, level, and temperature instrument innovators since 1964

Flow Switch Model FLT93S FlexSwitch®

Level Switch FLT93F

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Flow Switch Summary

The FLT93S insertion type FlexSwitch for flow 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.

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


Pump protection Safety spray nozzle monitoring
Cooling water/heat exchangers Oil well system testing
Drain line flow Relief valve monitoring



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]
    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 1" NPT conduit
port. Optional: Stainless steel. Optional: 2 conduit port, aluminum.

Compliances and Agency Approvals: FM, FMc, ATEX, IECEx, GOST-R, Inmetro. CE mark. PED, CRN.
Meets EC directives for EMC and LVD. Probe 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
DIP, Class II/III, Div. 1, Groups E,F,G
T4, Ta = 60C, T3A, Ta = 60

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 +40C, T6
Tamb (housing) = -40 to +60C, T5
Tp (sensing element) = -40 to 77C, T4
Tp (sensing element) = -40 to 177C, T2

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: -40 to +350 F  [-40 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]

Universal AC/DC supply. Input terminals and jumpers
on circut board select specific power.

AC 108-132V  13W, 100mA max.
AC 207-240V*  14W, 50mA max.
AC 18-28V  7W, 230mA max.
DC 21-30V  7W, 230mA max.

* AC mains preset by factory: FM & FMc as 108-132 Vac; All others as 207-240 Vac

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.

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.

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