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Capacitance Level measurement Liquicap FMI21

For continuous level measurement in conductive liquids

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Liquicap FMI21
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Capacitance Level measurement Liquicap FMI21

For continuous level measurement in conductive liquids

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Benefits

  • Safe and reliable function regardless of tank geometry
  • No calibration necessary (factory preconfiguration)
  • High quality, non-corrosive materials (carbon fibre, stainless steel) for use in aggressive liquids
  • No moving parts in tank
  • Cost-effective solution for continuous level measurement
  • Optimized storage by simply shortening the probe rods on site
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Capacitance Level measurement Liquicap FMI21

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Product information

Liquicap FMI21 - Capacitance level measurement
Capacitance - Liquicap FMI21
Specifications
Measuring / Application task Continuous / Liquids

Measuring principle

Capacitive

Characteristic / Application

Two-rod probe
Preconfigured from factory 0%...100%
High quality, non-corrosive materials (carbon fibre, stainless steel)
Suitable for aggressive liquids (many acids and alkalis)

Specialities

Probe shorting kit available

Supply / Communication

10 ... 30VDC

Accuracy

< 1%

Ambient temperature

-40 °C ... 70 °C
(-40 °F ... 158 °F)

Process temperature

-40 °C ... 100 °C
(-40 °F ... 212 °F)

Process pressure / max. overpressure limit

Vacuum ... 10 bar
(Vacuum ... 145 psi)

Main wetted parts

Probe rods:
316L/1.4404 / PP
Option: carbon fibre PP coated

Process connection

G 1½
NPT 1½

Sensor length

Total length of probe 2.5 m

Max. measurement distance

2.5 m (8 ft)

Communication

4 ... 20 mA

Certificates / Approvals

ATEX, CSA, CSA C/US

Safety approvals

Overfill prevention WHG

Options

Display

Application limits

Changing, non-conductive
media, conductivity
< 3 0 μS/cm
Highly viscous liquids
> 2 000 cst
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Description

Liquicap FMI21 is a simple and cost-effective rod probe for continuous level measurement for conductive liquids. High quality non-corrosive materials (carbon fibre, stainless steel) make it suitable even for aggressive liquids (e.g. acids and alkalis). Used in conjunction with the Fieldgate FXA320 (remote measured value interrogation using Internet technology), Liquicap is an ideal solution for Inventory Management Solutions.

Field of application

The device is preconfigured from factory 0 to 100% to probe length ordered. It can be used as of a conductivity of 30μS/cm and the measurement is independent of the dc-value (dielectric constant) of the liquid. Suited for cistern measurements.

  • Process connection: Thread
  • Process pressure: Vacuum to 10bar (vacuum to 145psi)
  • Measuring range: Up to 2.5m (8ft)
  • Temperature: -40 to +100°C (-40 to +212°F)
  • International explosion protection certificates, overfill prevention WHG
Benefits
  • Safe and reliable function regardless of tank geometry
  • No calibration necessary (factory preconfiguration)
  • High quality, non-corrosive materials (carbon fibre, stainless steel) for use in aggressive liquids
  • No moving parts in tank
  • Cost-effective solution for continuous level measurement
  • Optimized storage by simply shortening the probe rods on site
Predecessors
T6667, Double rod probe 11304Z
Downloads
Most downloaded
Technical Information (TI)
Liquicap T FMI21 Technical Information Two-rod probe for continuous measurement in liquids
English version - 06/2010
Download
Short Instruction (KA)
Liquicap T FMI21 Capacitive
English version - 09/2021
Download
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
The CAD Drawings will be available after the configuration.
More options
Download page as PDF Search downloads by serial number
More options
Download page as PDF Search downloads by serial number
All downloads
32 Downloads
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
Technical Information (TI)
Most downloaded
Liquicap T FMI21 Technical Information Two-rod probe for continuous measurement in liquids
English version - 06/2010
Download
Short Instruction (KA)
Liquicap T FMI21 Operating Instructions Capacitive level measurement
Two-rod probe for continuous measurement in liquids
English version - 06/2010
Download
Short Instruction (KA)
Most downloaded
Liquicap T FMI21 Capacitive
English version - 09/2021
Download
Short Instruction (KA)
KA Liquicap T FMI21 Capacitance level measurement
English version - 03/2024
Download
Ex Safety Instruction (XA)
Liquicap T FMI21 Approval No.: EG 04 016-a
ATEX II 3 G
Protection:
EEx nA IIC T6
English version - 08/2004
Download
ZE (Certificate)
Liquicap T FMI21 Allgemeine bauaufsichtliche Zulassung
Z-65.13-393 (DIBt)
German version - 10/2019
Download
ZE (Certificate)
RFID TAG Certificate/Declaration of Conformity ATEX:
II 2 G Ex ia IIC T6 Gb
II 2 D Ex ia IIIC T80°C Db;
IECEx:
Ex ia IIC T6 Gb
Ex ia IIIC T80°C Db
IECEx EPS 15.0042X; EPS 15 ATEX 1 1011 X
English version - 02/2019
Download
Special Documentation (SD)
RFID TAG Special Documentation RFID TAG
Special Documentation
English version - 08/2015
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per
applicazioni in liquidi e solidi sfusi
Italian version - 06/2026
Download
Fields of Activities (FA)
Catálogo Medición y Detección de nivel Gama de productos para aplicaciones con líquidos y sólidos
Spanish version - 06/2022
Download
Fields of Activities (FA)
レベル計 総合カタログ 液体および粉体アプリケーション向けレベル計・レベルスイッチ
Japanese version - 12/2025
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per applicazioni in liquidi e solidi sfusi
Italian version - 03/2023
Download
Fields of Activities (FA)
Füllstandsmesstechnik Produktübersicht für Anwendungen in Flüssigkeiten und Schüttgütern
German version - 10/2022
Download
Fields of Activities (FA)
Level measurement Product overview for applications in liquids and bulk solids
English version - 03/2026
Download
Competence Brochure (CP)
Selection Guide Continuous level measurement in liquids and bulk solids Selection and engineering guide for the process industry
English version - 03/2026
Download
Competence Brochure (CP)
Selection Guide, Auswahlhilfe. Kontinuierliche Füllstandmessung in Flüssigkeiten und Schüttgütern Auswahl- und Projektierungshilfe für die Prozessindustrie
German version - 03/2026
Download
Manufacturer Declaration
Product family: Cerabar, Cerabar M, Cerabar S, Ceraphant, Deltabar, Deltabar M, Deltabar S, Deltapilot M, Fieldgate, Gammapilot, Lev elflex, Liquicap M, Liquicap T, Liquiphant, Liquiphant FailSafe, Liquiphant M, Liquipoint, Liquipoint T, Liquitrend, Micropilot, Mic ropilot S, Minicap, Fermentation monitor, Prosonic M, Prosonic S, Prosonic T, Solicap M, Solicap S, Soliphant M, Soliphant T, Spare parts level, Strahlenschutzbehälter, System & Gauging, Tankvision, Waterpilot Product root: FDU90-, FDU91-, FDU91F-, FDU92-, FDU93-, FDU95-, FHX40-, FHX50-, FHX50B-, FMB50-, FMB51-, FMB52-, FMB53-, FMD71-, FMD7
2-, FMD77-, FMD78-, FMG50-, FMI21-, FMI51-, FMI52-, FMP50-, FMP51-, FMP52-, FMP53-, FMP54-, FMP55-, FMP56-, FMP57-, FMR10-, FMR10B-,
FMR20-, FMR20B-, FMR30B-, FMR43-, FMR50-, FMR51-, FMR52-, FMR53-, FMR532-, FMR54-, FMR540-, FMR56-, FMR57-, FMR60B-, FMR62B-, FMR63
B-, FMR66B-, FMR67B-, FMU30-, FMU40-, FMU41-, FMU42-, FMU44-, FMX11-, FMX21-, FTC260-, FTC262-, FTI51-, FTI52-, FTI55-, FTI56-, FTI7
7-, FTL31-, FTL33-, FTL41-, FTL43-, FTL50H-, FTL51B-, FTL51H-, FTL62-, FTL63-, FTL64-, FTL80-, FTL81-, FTL85-, FTM20-, FTM21-, FTM50
-, FTM51-, FTM52-, FTW23-, FTW31-, FTW32-, FTW33-, FWR30-, NMR81-, NMR84-, NMS80-, NMS81-, NMS83-, NMT532-, NMT539-
English version - 03/2025
Download
Manufacturer Declaration
Product family: Liquicap T Product root: FMI21-
Declaration number: HE_00801_01.17
Manufacturer specification: RoHS
Additional information: China-RoHS
Chinese version - 08/2017
Download
Manufacturer Declaration
Product family: Cerabar, Cerabar M, Cerabar S, Cerabar T, Ceraphant, CERAPHANT T, DELTABAR, Deltabar M, DELTABARS, Deltapilot M, DELTAPILOT S, DOPPELSTABSONDE, Dreistabsonde, Einstabsonde, Levelflex, Liquicap M, LIQUICAP T, LIQUIPHANT, LIQUIPHANT FAILSA FE, LIQUIPHANT M, Liquiphant S, LIQUIPHANT T, LIQUIPOINT, Liquipoint T, Micropilot, Micropilot S, MINICAP, NIVECTOR, NIVOCOM PACT, NIVOTESTER, Prosonic, Prosonic M, PROSONIC P, PROSONIC S, Prosonic T, Solicap M, Solicap S, Soliphant M, SOLIPHANT T, SOLIWAVE, WATERPILOT Declaration number: HE_00678_01.17
Manufacturer specification: Food hygiene
Additional information: ADI, TSE
English version - 07/2022
Download
EU Declaration
Product family: Liquicap T Product root: FMI21-
Declaration number: EU_01035_01.22
English version - 07/2022
Download
UK Conformity Assessed
Product family: Liquicap T Product root: FMI21-
Declaration number: UK_00245_01.21
English version - 04/2021
Download
Product Carbon Footprint Information
Product family: Liquicap T Product root: FMI21-
Declaration number: ED_00285_01.26
English version - 08/2026
Download
Miscellaneous
Product family: Liquicap M, Liquicap T Product root: FMI21-, FMI51-, FMI52-, FTI51-, FTI52-
Region: Australia
Approval agency: ACMA
Approval number: EC12009A
English version - 09/2012
Download

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Spare parts and accessories

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Liquicap FMI21 - Capacitance level measurement
Capacitance - Liquicap FMI21

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Spare parts and accessories

Cover
Cover

Cover F16 high, transparent, gasket

Cover
Cover
Order code 52025605
Drawing number 20
Cover
Cover

Cover F16 grey, PBTP, gasket

Cover
Cover
Order code 52025606
Drawing number 20
Sealing
Sealing

O-ring 71.0x3.55 EPDM, 5 pieces

Sealing
Sealing
Order code 52004137
Drawing number 21
Electronic
Electronic

Electronics FEI20

Electronic
Electronic
Order code 52025603
Drawing number 30
Spare parts and accessories
Search spare parts by number in drawing
preview image Show drawing (PDF)
20 results
Cover
Cover

Cover F16 high, transparent, gasket

Cover F16 high, transparent, gasket

Cover
Cover
Order code 52025605
Drawing number 20
Cover
Cover

Cover F16 grey, PBTP, gasket

Cover F16 grey, PBTP, gasket

Cover
Cover
Order code 52025606
Drawing number 20
Sealing
Sealing

O-ring 71.0x3.55 EPDM, 5 pieces

O-ring 71.0x3.55 EPDM, 5 pieces

Sealing
Sealing
Order code 52004137
Drawing number 21
Electronic
Electronic

Electronics FEI20

Electronics FEI20

Electronic
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Order code 52025603
Drawing number 30
Display
Display

Digital display, holder

Digital display, holder

Display
Display
Order code 52025604
Drawing number 40
Miscellaneous
Miscellaneous

Spacer probe rods, 5 pcs.

Spacer probe rods, 5 pcs.

Miscellaneous
Miscellaneous
Order code 52025607
Drawing number 55
further parts
further parts

Sealing ring G1-1/2, 48x55 FA, 5 pcs.

Sealing ring G1-1/2, 48x55 FA, 5 pcs.

further parts
further parts
Order code 52014047
Drawing number 57

Shorting kit FMI21

Shorting kit FMI21

Order code 52024300

Protection cover F16 housing

Protection cover F16 housing

Order code 71127760

Mounting nut G1-1/2, PC

Mounting nut G1-1/2, PC

Order code 52014146
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Selection of compatible products

RN42 active barrier, wide-range power supply of loop-powered transmitters
RN42 active barrier

Active barrier, 1 channel for 4 to 20 mA, HART® transparent with 24 to 230 V AC/DC as well as active/passive input and output, optionally with SIL and Ex

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Prices temporarily unavailable
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activating price
price: provide information
Price after configuration
Product picture loop-powered indicator RIA15
RIA15 process indicator

Loop-powered Ex ia process indicator as field or control panel device for 4 to 20 mA signals or HART®protocol

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Prices temporarily unavailable
activating price
price: provide information
Price after configuration
Product picture surge arrester HAW569
HAW569 surge protective device

Surge protective device for installation in the field device for power supply and communication signals optional with SIL and Ex approval

Loading price
Prices temporarily unavailable
Prices temporarily unavailable
activating price
price: provide information
Price after configuration
Product picture surge arrester HAW562
HAW562 surge protective device

DIN rail surge protective device for installation in the control cabinet for power supply and communication signals optional with SIL and Ex approval

Loading price
Prices temporarily unavailable
Prices temporarily unavailable
activating price
price: provide information
Price after configuration
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