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Products / Flow / ABB Vortex and Swirl flowmeters
VortexMaster FSV430/450 · SwirlMaster FSS430/450

ABB Vortex and Swirl flowmeters

For liquids, gases and especially steam. VortexMaster uses a widely established industrial technology. SwirlMaster uses ABB's proprietary Swirl technology and is particularly useful on skids without space for long straight runs.

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Models

Standard version or advanced flow computer?

ABB VortexMaster FSV430
Vortex · standard

VortexMaster FSV430

For volumetric measurement of liquids, gases and steam. A straightforward solution when advanced integrated compensation is not required.

ABB FSV430
DatasheetPDF ENOperating instructionsPDF EN
ABB VortexMaster FSV450
Vortex · advanced

VortexMaster FSV450

A more comprehensive version with an integrated Pt100 as standard and flow computer functions for mass flow, energy flow and application-specific compensation.

ABB FSV450
DatasheetPDF ENOperating instructionsPDF EN
ABB SwirlMaster FSS430
ABB Swirl · standard

SwirlMaster FSS430

ABB's proprietary Swirl technology is designed for liquids, gases and steam with very short straight-run requirements, making it suitable for skids and compact piping.

ABB FSS430
DatasheetPDF ENOperating instructionsPDF EN
ABB SwirlMaster FSS450
ABB Swirl · advanced

SwirlMaster FSS450

Combines Swirl installation flexibility with more advanced flow computer and compensation functions for gases, liquids and steam.

ABB FSS450
DatasheetPDF ENOperating instructionsPDF EN
SteamVortex and Swirl are well suited to saturated and superheated steam, boilers, utilities and power generation circuits. Select nominal size for the actual range to keep Reynolds number and vortex frequency within their operating limits.
InstallationVortex typically needs longer straight runs. ABB SwirlMaster offers an advantage where space is limited: typically 3D upstream and 1D downstream. After a control valve, ABB specifies 5D upstream, and some geometries require different conditions.

When we recommend them

  • Saturated and superheated steam.
  • Process and utility gases.
  • Clean liquids with sufficient Reynolds number.
  • Swirl on skids, packaged units and compact piping.
  • Applications requiring technology without moving parts.

When to assess alternatives

  • Flow rates too low for the nominal size, potentially below the usable Reynolds number.
  • Two-phase flow, substantial condensation in gases or bubbles in liquids.
  • Liquids close to cavitation conditions.
  • Strong mechanical vibration near the measurement frequency.
  • Very accurate mass flow or density measurement: Coriolis may be more suitable.
Best practice

What makes the difference in the field

Size for the flow rangeAn oversized Vortex meter loses low-flow sensitivity. Do not automatically select the existing pipe diameter.
Check flow disturbancesElbows, valves, reducers and double bends cause swirl or distorted profiles. Follow the manual's straight-run requirements.
Steam: avoid condensateSteam quality and pipe drainage must prevent condensate slugs that affect measurement.
High temperatureManage electronics orientation and insulation to limit the ambient temperature around the transmitter.
Liquids: prevent cavitationMaintain sufficient downstream pressure. Cavitation and flashing severely compromise measurement quality.
CompensationFor gas or steam mass and energy flow, check whether external pressure and temperature measurements or integrated 450 functions are required.
ABB replacements

Trio-Wirl and earlier generations

Trio-Wirl

ABB VLMABB SWM

Legacy Vortex

ABB FV4000ABB FV4111

Legacy Swirl

ABB FS4000ABB FS4111
Correct migration requires the full code, nominal size, flanges, materials, pressure, temperature, flow range and required compensation functions.
ABB documentation · Flow

ABB datasheets and manuals

Download model-specific PDFs with language and revision details. Shared manuals and commissioning instructions are identified in the document cards.

VortexMaster FSV430 / FSV450

VortexMaster datasheet and shared VortexMaster / SwirlMaster manual.

DatasheetPDF ENOperating instructionsPDF EN
  • DS/FSV430/450 · Rev. J · 08.2025 · EN
  • OI/FSS/FSV/430/450 · Rev. J · 10.2025 · EN

SwirlMaster FSS430 / FSS450

SwirlMaster datasheet and shared VortexMaster / SwirlMaster manual.

DatasheetPDF ENOperating instructionsPDF EN
  • DS/FSS430/450 · Rev. I · 08.2025 · EN
  • OI/FSS/FSV/430/450 · Rev. J · 10.2025 · EN
ABB documentation · Flow

Datasheets and manuals for earlier series

Original documents for legacy series. Check the full model and version before using a document.

TRIO-WIRL · ST4000 / SR4000 / VT4000 / VR4000

Original manual for ST4000 / SR4000 Swirl and VT4000 / VR4000 Vortex versions. It does not automatically apply to VLM / SWM designations.

Operating instructionsPDF EN
  • PN25080 · Revision not stated · 06.2003 · EN
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Technical FAQ

Frequently asked questions

Vortex or Swirl?

Both measure liquids, gases and steam. Vortex is widely used for steam and utilities; ABB Swirl is particularly useful where available straight pipe length is limited.

How many straight pipe diameters does SwirlMaster require?

ABB typically specifies 3D upstream and 1D downstream. This is not universal: valves require more upstream length, and some disturbances need different conditions.

FSV430 or FSV450?

FSV430 is the standard volumetric-flow version. FSV450 adds advanced functions, temperature input and calculation or compensation capabilities useful for gases and steam.

FSS430 or FSS450?

The distinction is similar: FSS430 covers standard applications, while FSS450 offers more advanced flow computer and compensation functions.

Why are Vortex meters used for steam?

They have no moving parts and work well with saturated and superheated steam when sized for the actual range and suitable steam quality.

What are the most common mistakes?

Oversizing, ignoring straight runs or vibration, installing in two-phase or cavitating conditions, and overlooking density or compensation requirements.

How do you replace a Trio-Wirl?

Trio-Wirl VLM/SWM and FV4000/FV4111/FS4000/FS4111 families are assessed for replacement by VortexMaster or SwirlMaster after checking size, pressure, temperature, flanges and functions.