VEGAFLEX 81
TDR sensor for continuous level and interface measurement of liquids
Universal TDR sensor for liquids of all kinds
Application area
Your benefit
- The guided adjustment enables a simple, time-saving and reliable setup
- Shortenable probes offer a simple standardisation and highest flexibility in the planning
- Comprehensive diagnostic possibilities ensure a maintenance-free operation and hence a high plant availability
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All documents and software for this product can be found in our Download Center.
Show all downloadsThe ace for level measurement and interface measurement in all liquids
![](/-/media/images/application-graphics/productdetailpages/appl_fx81-mini.png?rev=1cd459d5974e4acd8ffb2d61060d63d3)
The VEGAFLEX 81 guided radar sensor is exceptional when it comes to measuring the level or interface of liquids. Guided radar is extremely versatile and can be found in almost every industrial sector. Whether bitumen or liquefied gas, in storage containers or standpipes, in a metering tank or in tank farms – VEGAFLEX 81 measures the level or interface (separation layers) of liquids with great reliability and accuracy.
Guided radar delivers reliable measurements data for control or safety systems for
- Level measurement in ammonia storage tanks
- Level measurement in standpipes
- Interface measurement in storage tanks, bypass tubes, standpipes
Other applications
- 75 m [Meter - Foot]
- -60 ... 200 °C [°C - °F]
- -1 ... 40 bar [Bar - kPa - psi]
- ± 2 mm
- Basic version for exchangeable cable ø 2; ø 4 mm
- Basic version for exchangeable rod ø 8 mm
- Basic version for exchangeable rod ø 12 mm
- Coax version ø 21.3 mm for ammonia application
- Coax version ø 21.3 mm with single hole
- Coax version ø 21.3 mm with multiple hole
- Coax version ø 42.2 mm with multiple hole
- Exchangeable rod ø 8 mm
- Exchangeable rod ø 12 mm
- Exchangeable cable ø 2 mm with gravity weight
- Exchangeable cable ø 4 mm with gravity weight
- Exchangeable cable ø 2 mm with centering weight
- Exchangeable cable ø 4 mm with centering weight
- Exchangeable cable ø 4 mm without weight
- exchangeable, PFA-coated cable ø4 mm with non-coated centering weight
- PFA
- 316L
- Alloy C22 (2.4602)
- Alloy 400 (2.4360)
- Alloy C276 (2.4819)
- Duplex (1.4462)
- 304L
- ≥ G¾, ≥ ¾ NPT
- ≥ DN25, ≥ 1"
- EPDM
- FKM
- FFKM
- Silicone FEP coated
- Borosilicate glass
- Plastic
- Aluminium
- Stainless steel (precision casting)
- Stainless steel (electropolished)
- IP66/IP68 (0,2 bar)
- IP66/IP67
- IP66/IP68 (1 bar)
- Profibus PA
- Foundation Fieldbus
- Two-wire: 4 … 20 mA/HART
- Modbus
- Four-wire: 4 … 20 mA/HART
- -40 ... 80 °C
- ATEX / Europe
- CSA / Canada
- FM / USA
- EAC (GOST) / Belarus
- EAC (GOST) / Kazakhstan
- EAC (GOST) / Russia
- IEC / worldwide
- NEPSI / China
- UKR Sepro / Ukraine
- INMETRO / Brazil
- CCOE / India
- KTL Korea
- UKEX
- Intrinsic safety "i"
- Flameproof enclosure "d"
- Dust ignition protection "t"
- FDA
- ABS
- BV
- CCS
- DNV
- LR
- NK
- RINA
- WHG
- VLAREM II
- SIL2
- PLICSCOM
- PC, PACTware and DTM
- HART-Communicator
- Software (e. g. AMS™, PDM)
- Display/adjustment module PLICSCOM
- VEGADIS 81
- VEGADIS 82
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Guided radar
Product information
VEGAFLEX 81, 83, 86
Specification sheet
VEGAFLEX 81
Two-wire: 4 … 20 mA/HART
Operating instructions
VEGAFLEX 81
Two-wire: 4 … 20 mA/HART
Drawing generator
Further downloads for this product
All documents and software for this product can be found in our Download Center.
Show all downloadsBluetooth USB adapter
![](/-/media/images/products/signal-conditioning/bluetooth-usb-adapter.png)
Wireless adjustment of sensors and instruments via Bluetooth
Show ProductVEGADIS 81
![](/-/media/images/products/signal-conditioning/f-dis81-messwertanzeige-bedienung-vega-sensoren-bt.png)
Remote measurement value indication and adjustment of plics® sensors
Show ProductVEGADIS 82
![](/-/media/images/products/signal-conditioning/f-dis82-messwertanzeige-bedienung-4-20ma-obt.png?rev=cdfa1c8d996d4b598f830b9a538bf8c5)
External measured value display and adjustment for 4 ... 20 mA/HART sensors
Show ProductVEGADIS 176
![](/-/media/images/products/signal-conditioning/vegadis176_digitales_anzeigeinstrument_ohne_hilfsenergie_für_schalttafeleinbau.png?rev=3da5ee1210bb4532b4471d344136740f)
Remote display for use in 4 ... 20 mA current loop
Show ProductMagnetic pen for display/adjustment module PLICSCOM
![PLICSCOM Magnet Pen](/-/media/images/products/accessory/f-102812-magnetpen.png?rev=32990f912edc4368a2e0da5b9582918f)
Magnetic pen for on-site adjustment
Show ProductVEGAMET 141
![](/-/media/images/products/signal-conditioning/f-met141-xxxx-display-v01/vegamet141-xxxx-display-variant.gif?mh=140&hash=B7C9C9B4329A881D5CC04BD751FDF5BD)
1 x 4 … 20 mA sensor input, 1 x 4 … 20 mA current output, 3 x operating relay, 1 x fail safe relay (instead of operating relay), Ex approval, separator, ship approval, on-site display, turn/push button and Smartphone operation
Show ProductVEGAMET 142
![](/-/media/images/products/signal-conditioning/f-met142-xxxx-display-v01/vegamet142-xxxx-display-variant.gif?mh=140&hash=6BFAB652B5111A6794F7442833F681A0)
2 x 4 … 20 mA sensor inputs, 2 x 4 … 20 mA current outputs, 3 x operating relay, 1 x fail safe relay (instead of operating relay), Ex approval, separator, ship approval, on-site display, turn/push button and Smartphone operation
Show ProductVEGAMET 341
![](/-/media/images/products/signal-conditioning/f-met341-xxxx-display-v01/vegamet341-xxxx-display-web.gif?mh=140&hash=4C5A06BC9481719600D7633C43988FC2)
1 x 4 … 20 mA sensor input, 1 x 4 … 20 mA current output, 3 x operating relay, 1 x fail safe relay (instead of operating relay), Ex approval, separator, ship approval, on-site display, turn/push button and Smartphone operation
Show ProductVEGAMET 342
![](/-/media/images/products/signal-conditioning/f-met342-xxxx-display-v01/vegamet342-xxxx-display-web.gif?mh=140&hash=FED44B915AC465997E44AC46D969E3F5)
2 x 4 … 20 mA sensor inputs, 2 x 4 … 20 mA current outputs, 3 x operating relay, 1 x fail safe relay (instead of operating relay), Ex approval, separator, ship approval, on-site display, turn/push button and Smartphone operation
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1 x 4 ... 20 mA sensor input, 1 x 4 ... 20 mA current output, 3 x operating relay, 1 x fail safe relay (instead of operating relay), on-site display, 4-button and smartphone operation
Show ProductVEGAMET 842
![](/-/media/images/products/signal-conditioning/f-met842-xxx1c-with-display/f-met842-xxx1c-with-display.gif?mh=140&hash=2497195F8F247D25BF7313B09303AB37)
2 x 4 ... 20 mA sensor inputs, 2 x 4 ... 20 mA current outputs, 3 x operating relay, 1 x fail safe relay (instead of operating relay), on-site display, 4-button and smartphone operation
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![](/-/media/images/products/signal-conditioning/f-met861-xxx1c-with-display/f-met861-xxx1c-with-display.gif?mh=140&hash=FF343AE857941976F797AA6BE7C56287)
1 x 4 ... 20 mA/HART sensor input, 2 x digital inputs, 1 x 4 ... 20 mA current output, 4 x operating relay, 1 x fail safe relay (instead of operating relay), on-site display, 4-button and smartphone operation
Show ProductVEGAMET 862
![](/-/media/images/products/signal-conditioning/f-met862-xxx1c-with-display/f-met862-xxx1c-with-display.gif?mh=140&hash=AE5EB08BC41D5A93E617E43568D36080)
2 x 4 ... 20 mA/HART sensor inputs, 4 x digital inputs, 3 x 4 ... 20 mA current outputs, 6 x operating relays, 1 x fail safe relay (instead of operating relay), on-site display, 4-button and smartphone operation
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Measured value indication, simple control functions such as remote enquiry of measured values for a 4 ... 20 mA/HART sensor
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![VEGAMET625 Auswertgeraet und Anzeigeinstrument fuer Fuellstandsensoren](/-/media/images/products/signal-conditioning/f-vegamet625-auswertgeraet-und-anzeigeinstrument-fuer-fuellstandsensoren.png?rev=47b21ad39956410cbb2462bb3f8109ef)
Measured value indication, simple control functions such as remote enquiry of measured values for two HART sensors
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Measured value indication, simple control functions, remote enquiry of measured data. optimized for water/sewage water industry
Show ProductVEGATOR 141
![Single channel signal conditioning instrument for level detection - 4 … 20 mA](/-/media/images/products/signal-conditioning/f-vegator141.png?rev=6e72c1df378346b391d1f14712a4ef76&mh=140&hash=10A72DC1892948224A4D25514C25A499)
Transmission of 4 ... 20 mA signals for level signalling
Show ProductVEGATOR 142
![Double channel signal conditioning instrument for level detection - 4 … 20 mA](/-/media/images/products/signal-conditioning/f-vegator142.png?rev=9d01b7d22ca5451fbfd347dab350b1ef&mh=140&hash=6A1876EFCA3CDEC6B5CEB44E4AB04C50)
Transmission of 4 ... 20 mA signals for level signalling
Show ProductVEGASCAN 693
![Signal conditioning instrument for up to 15 HART sensors](/-/media/images/products/signal-conditioning/f-vegascan693-auswertgeraet-fuer-bis-zu-15-hart-sensoren.png?rev=32d80a1365a34eb6b2a897bb57697a28)
Measured value indication and remote enquiry of measured data for up to 15 HART sensors
Show ProductPLICSMOBILE T81
![externe-GSM-GPRS-Funkeinheit](/-/media/images/products/signal-conditioning/f-plicsmobilet81-external-radio-unit-for-hart-sensors.png?rev=372f3249aeda4e12b7f390ee34e722dd)
Measured data enquiry and remote parameter adjustment for a HART sensor
Show ProductVEGATRENN 141
![Einkanaliger Speisetrenner für 4 … 20 m/HART-Sensoren](/-/media/images/products/signal-conditioning/f-vegatrenn141-1.png?rev=8d981222acb644d5bf77ec053f2b0808&mh=140&hash=C6A475A079EDE7E9E55E199875B8C504)
Single channel separator for 4 … 20 m/HART sensors
Show ProductVEGATRENN 142
![Zweikanaliger Speisetrenner für 4 … 20 m/HART-Sensoren](/-/media/images/products/signal-conditioning/f-vegatrenn142-1.png?rev=65ef1bf437dd49328031e5e7aee2d115&mh=140&hash=A1752D26495A20CB0378C775D87FFC6B)
Double channel separator for 4 … 20 m/HART sensors
Show ProductVEGATRENN 151
![Einkanaliger Trennübertrager in Zweileitertechnik für 4 … 20 mA-Sensoren](/-/media/images/products/signal-conditioning/f-vegatrenn151-1.png?rev=c071a5fc6a4a4b84a581c439b09c2be9&mh=140&hash=2E24CB4774F5EA97BCBE91AC2A760509)
Single channel separator in two-wire technology for 4 … 20 mA sensors
Show ProductVEGATRENN 152
![Zweikanaliger Trennübertrager in Zweileitertechnik für 4 … 20 mA-Sensoren](/-/media/images/products/signal-conditioning/f-vegatrenn152-1.png?rev=55aa7255fe3246e48aba34a39f4faf2f&mh=140&hash=94379E492874E14C39EF1D6434646FF1)
Double channel separator in two-wire technology for 4 … 20 mA sensors
Show ProductOvervoltage protection B 81-35
![](/-/media/images/products/signal-conditioning/overvoltagearrester-b81-35.png?rev=a2bd2cdf8a564ea59a7c95dc1ccf6af6)
Pluggable overvoltage protection for supply and signal cables
Show ProductOvervoltage protection B 63-32
![Überspannungsschutz B63](/-/media/images/products/signal-conditioning/f-ueberspannungsschutz-b63.png?rev=92ffca4f76234715a6d63d97214acba2)
Overvoltage protection for Profibus PA and Foundation Fieldbus circuits
Show ProductOvervoltage protection B 63-48
![Ueberspannungsschutz-B63](/-/media/images/products/signal-conditioning/f-ueberspannungsschutz-b63.png?rev=4fb859b6075e4dcb89ed3321364d574a)
Overvoltage protection for two-wire circuits
Show ProductOvervoltage protection B 62-30 W
![Ueberspannungsschutz B62-30W in Zweileitertechnik Profibus-PA Foundation-Fieldbus-Stromkreise](/-/media/images/products/signal-conditioning/f-ueberspannungsschutz-b62-30w-in-zweileitertechnik-profibus-pa-foundation-fieldbus-stromkreise.png?rev=1f13e070c76c43ceac5b887e13294186)
Overvoltage protection for Profibus PA and Foundation Fieldbus circuits
Show ProductOvervoltage protection B 62-36 G
![Ueberspannungsschutz B62-30G Versorgungs- und Signalleitungen in 4-20 mA-Stromkreisen](/-/media/images/products/signal-conditioning/f-ueberspannungsschutz-b62-30g-versorgungs-und-signalleitungen-in-4-20-ma-stromkreisen.png?rev=7e5c1e8ce85949ac8a5e5dad50e83909)
Overvoltage protection for two-wire circuits
Show ProductVEGACONNECT
![](/-/media/images/products/signal-conditioning/f-vegaconnect-interface-adapter.png?mh=140&hash=D421D3698C54B2193735254FA0BF45E3)
Interface adapter between PC and VEGA instruments
Show ProductVEGABOX 03
![Druckausgleichsgehäuse mit Belüftungsfilter](/-/media/images/products/signal-conditioning/f-box03-xxikxnxcx-v01.png?rev=0a024dfb91f44c17bf345758b309f4b5)
Breather housing with ventilation filter
Show ProductProfibus PA/DP segment coupler
![](/-/media/images/products/signal-conditioning/f-profibus-segment-coupler.png?rev=b4cd40c7aa2c43779edf7454faddb3a6)
Simple segment coupler for up to 93.75 kbit/s DP-side
Show ProductG1½ threaded adapter for VEGAFLEX 80 and VEGAPULS 64
VEGAFLEX series 80 cable and rod components
VEGAFLEX series 80 probe extensions
VEGAFLEX series 80 spacers
![](/-/media/images/products/accessory/102336-vegaflex-zentriersterne.png?rev=f73e89eea06d4779a86a90163fb17241)
Spacers or centering weights fix the measuring probe in the middle of the tube.
Show ProductVEGAFLEX series 80 centering/gravity weights
FLEX80 tensioning facility for cable version of FLEX81, FLEX86
Antenna extension PLICSMOBILE
VEGADIS adapter
![102410-Adapter-VEGADIS81-or-BAR-Slave](/-/media/images/products/accessory/102410-adapter-vegadis81-oder-bar-slave.png?rev=19cab4c6978d49dab2afbd9fce3b364e)
For connection of an external display and adjustment unit or a Secondary sensor.
Show ProductElectronics VEGAFLEX serie 80
Process component VEGAFLEX 81
PLICSMOBILE plug connector with SMA connection
Electronics PLICSMOBILE series 80
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VEGAFLEX 81
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