Coriolis mass flowmeter for low flow and dosing applications

  • High accuracy (±0.1%) for gases and liquids >0.3 kg/h / 0.01 lb/min; maintains operation over a wide range of gas fractions and complex flow conditions (EGMTM)
  • Standard pressure rating up to 300 bar / 4351 psi
  • Flange: DN15 / 1/2"; also thread and clamp connections
  • 3 x 4…20 mA, HART®7, Modbus, FF, Profibus-PA/DP, PROFINET, EtherNet/IP™, Bluetooth®
  • Icon/Logo for EGM Entrained Gas Management

OPTIMASS 3400 C – Compact version with threaded connection

OPTIMASS 3400 C Coriolis mass flowmeter – Compact version with threaded connection

The OPTIMASS 3400 is a cost-effective Coriolis mass flowmeter for accurate flow measurement of liquids and gases in a variety of demanding low flow and dosing applications (from 0.3 kg/h or 0.01 lb/min upwards). The OPTIMASS 3400 features Entrained Gas Management (EGMTM) for liquid applications and thus maintains operation even with entrained gas of up to 100%.

The OPTIMASS 3400 features a single Z-tube design which guarantees a low pressure drop across the meter. The device is available with NPT connections, a range of flange connections as well as standard hygienic connections. Like with all other KROHNE Coriolis mass flowmeters there are no installation restrictions as the OPTIMASS 3400 is not affected by crosstalk/line vibrations and can thus be installed in series or in parallel. The Coriolis meter is approved for use in hazardous areas. It offers various diagnostic functions (NE 107) and digital communication options. Via the OPTICHECK Flow Mobile app all device settings can be managed on-site via a secure Bluetooth® connection. In this way, a variety of commissioning tasks, e.g. zero calibration or configuration of diagnostics, can be done wirelessly.

Product highlights

  • Single Z-tube design
  • Entrained Gas Management (EGMTM): maintains operation with air or gas entrainments in the medium
  • Device commissioning, verification, diagnostics and monitoring via a secure wireless Bluetooth® connection (<20 m / 65.6 ft)
  • Fast and completely digital signal processing
  • High accuracy: ±0.1% of MV for liquids / ±0.5% of MV for gases
  • Extensive sensor and process diagnostics (incl. NE 107)
  • Integrated temperature measurement
  • 3 sizes in a single footprint
  • Optional PED approved secondary pressure containment up to 30 barg / 435 psig
  • Many options (heat tracing, purge port etc.)
  • Easily drained and easy to clean
  • No crosstalk: resistant to installation and process effects
  • On-site verification of flowmeter with OPTICHECK service tool

Typical applications


  • Batching, dosing and filling applications with very low flow rates
  • Measurement of liquids, gases and gas entrained liquids

Oil and gas industry

  • Natural gas and propane odorisation
  • Chemical injection

Chemical and other process industries

  • Concentration and density measurement of low volumes
  • Batching to reactors

Pharmaceutical industry

  • Fragrance dispensing and high precision coatings
  • Dosing of ingredients

Food and beverage industry

  • CO2 injection and dosing

Machinery and apparatus (OEM industry)

  • Engine test beds (e.g. in the automotive industry)

Pulp and paper industry

  • Additives, bleaches and colourants

Accessories for this product


Handheld for in-depth verification, device commissioning and monitoring

  • On-site performance check and verification (level 0,1,2) without process interruption
  • Convenient commissioning of field devices, e.g. zero calibration
  • Detailed reports for proof test documentation of safety loops acc. to IEC 61508/61511, and for quality management systems (ISO 9001)

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DTM for advanced device verification and commissioning

  • Usable with any FDT frame application from the control room or on site
  • Advanced verification (level 0,1) without process interruption
  • Detailed reports for proof test documentation of safety loops acc. to IEC 61508/61511, and for quality management systems (ISO 9001)

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Mobile app for wireless device commissioning, verification and monitoring

  • Wireless commissioning and device parametrisation via secure Bluetooth connection
  • Verification without measurement interruption
  • Monitoring of meter performance and application parameters
  • Free download for iOS and Android

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Related products

MFC 400

Coriolis mass flow converter for combination with OPTIMASS Coriolis mass flow sensors

  • Compact and remote field housing
  • With extensive diagnostics (NE107) and Entrained Gas Management (EGM™) for advanced requirements
  • 4-wire, 3 x 4…20 mA, HART®7, Modbus, FF, Profibus-PA/DP, PROFINET, EtherNet/IP™, Bluetooth®
  • Secure wireless access via Bluetooth® or remotely via HART® even in safety-related applications

View product details


Coriolis mass flow sensor for combination with MFC 010 and MFC 400 signal converters

  • Single Z-tube design
  • Connection sizes: DN15 / ½"
  • Tube material: Stainless steel or Hastelloy®

View product details


KROHNE - Technology you can trust

Related website

Find more information about our safe, reliable and simple to handle process instrumentation for Safety Instrumented Systems and an overview of the KROHNE SIL competence on this dedicated website.

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OPTIMASS portfolio

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Explore the technical details and highlights of our OPTIMASS Coriolis flow meter family in an interactive demo that features 360° views plus short video clips.

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