KROHNE OPTIMASS 1400 Twin Tube Coriolis Mass Flowmeter

Overview of the KROHNE OPTIMASS 1400

The KROHNE OPTIMASS 1400 is a twin straight tube Coriolis mass flowmeter that KROHNE describes as the first choice for universal applications and the best price-performance ratio in its Coriolis range. It reliably measures mass flow, density and temperature of liquids, gases and slurries and derives volume flow, concentration and solid content. Available in four sizes from 15 to 50, as a compact unit or with a remote field converter, it suits standard process applications up to +130 °C and 100 barg.

Seven Star LLC supplies the KROHNE OPTIMASS 1400 to chemical, water, food and oil and gas users in the Sultanate of Oman and the GCC. As a trusted supplier with engineering support in Muscat, we size the meter against flow range, pressure drop and fluid properties and confirm flange rating, converter outputs and hazardous-area approvals before quotation.

Measuring Principle

A twin tube Coriolis meter consists of two parallel measuring tubes, a drive coil in the middle and two pick-off sensors placed on either side of it. When energised, the drive coil makes the tubes oscillate at their natural frequency, producing a sine wave that both sensors monitor. With no flow, the two signals are in phase. When a liquid or gas passes through the tubes, the Coriolis effect twists them slightly, creating a phase shift between the inlet and outlet sensors that is directly proportional to mass flow.

Density is determined from the oscillation frequency of the tubes, which changes with the mass of the fluid inside them, and process temperature is measured with an integrated Pt500 sensor. Because mass is measured directly, the KROHNE OPTIMASS 1400 needs no compensation for pressure, temperature or viscosity, and it requires no inlet or outlet straight runs. The result is a multi-variable measurement with no moving parts, low pressure loss and long-term stability.

Engineering Design of the KROHNE OPTIMASS 1400

The sensor is fully welded and maintenance free. The measuring tubes are made of duplex stainless steel UNS S31803 (1.4462), the spigots and flanges of dual-certified 316/316L, and the outer cylinder of 304/304L with 316/316L as an option. An optimised flow divider minimises pressure loss, and the straight tube geometry makes the meter self-draining and easy to clean. Options include a 316L heating jacket for products that would otherwise solidify, insulation, and purge ports that allow the secondary containment to be drained safely or used for early detection of a tube failure with toxic chemicals.

The KROHNE OPTIMASS 1400 works with the MFC 400 signal converter in compact (1400C) or remote field (1400F) form. The modular electronics provide comprehensive diagnostics, Entrained Gas Management that keeps the meter measuring when air or gas is entrained in the liquid, and plug-and-play replacement with data redundancy. KROHNE lists 4–20 mA with HART, PROFIBUS PA and FOUNDATION Fieldbus among the communication options, along with Ethernet-APL for hazardous areas and Bluetooth commissioning and verification within 20 m.

Key Features

The technical datasheet and KROHNE product data describe the following features of the KROHNE OPTIMASS 1400:

• Liquid mass flow accuracy of ±0.15 % of rate plus zero stability, and repeatability better than 0.075 %.
• Gas mass flow accuracy of ±0.5 % of rate, with repeatability better than 0.2 %.
• Density range of 400–2500 kg/m³ with ±2 kg/m³ accuracy for sizes 25 to 50, and temperature accuracy of ±1 °C.
• Nominal flow rates from 4,800 kg/h (size 15) to 125,000 kg/h (size 50) at 1 bar pressure drop, with 130 % overrange.
• No inlet or outlet straight runs required, and resistance to installation and process effects without crosstalk.
• Pressure rating of −1 to 100 barg at 20 °C, with optional PED-approved secondary containment up to 100 barg.
• NACE MR0175/ISO 15156 and MR0103 compliance and CRN approval to ASME B31.3.
• Entrained Gas Management and NAMUR NE 107 diagnostics, with on-site verification using the OPTICHECK service tool.

Industrial Applications

KROHNE lists bulk loading, batching to reactors, flocculant dosing in water and wastewater, fuel consumption measurement in the marine industry and flow, density and specific gravity measurement in food and beverage processes as typical duties. In Oman the KROHNE OPTIMASS 1400 is well suited to chemical injection and corrosion inhibitor dosing skids at oil and gas facilities, fuel oil and diesel consumption on power plants and vessels, polyelectrolyte and coagulant dosing at water treatment and desalination plants, and batching in food, beverage and dairy factories in the Rusayl and Sohar industrial areas.

Its hygienic connection options, from Tri-clamp to DIN 11851 threads, also serve pharmaceutical and beverage producers that need clean-in-place compatible meters. For larger lines or higher temperatures, Seven Star LLC can propose the KROHNE OPTIMASS 6400 Coriolis mass flowmeter, or alternatives such as the Yokogawa ROTAMASS Total Insight Coriolis flowmeter and the Endress+Hauser Promass F300, all supplied from Muscat to customers across the GCC.

Technical Specifications of the KROHNE OPTIMASS 1400

The specifications below are taken from the KROHNE OPTIMASS 1400 technical datasheet TD R02 (05/2019); converter data are given in the separate MFC 400 documentation.

How to Order

For a quotation on the KROHNE OPTIMASS 1400, send Seven Star LLC an RFQ listing the fluid, minimum and maximum flow, operating pressure and temperature, density, line size and connection standard, required outputs and Ex approval. Our instrumentation division in Muscat will select the right meter size, confirm the MFC 400 configuration and check current availability and lead time. The technical datasheet can be downloaded from this page, and our engineers support customers across Oman and the GCC from sizing to commissioning.