Editor’s choice fmt430 and 450 - These two devices are for

such as methane. These need to be operated at a low pressure to reduce the likelihood of a fire. The FMT400 is ATEX rated and therefore particularly well suited to this type of application. The accuracy of a thermal mass flowmeter can be dramatically affected by liquid drops forming on the sensor due to moisture. The specific heat capacity of liquid differs significantly from gas. The sensor needs to be positioned on the upward leg of the pipe so that any liquid in the pipe stays at the bottom. Another method is to use what’s known as a “water trap” to remove liquid from the fluid.

What are each of the different thermal mass floWmeters for?

eco2 fmt200 - This is the entry level device designed for air measurement only. It is highly capable at measuring flow in compressed air systems and checking for leakage. Compressed air is an expensive commodity and accurate measurement of its use or of leakage in the system can pay for itself. fmt230 /250 – These devices are ideally

suited for OEM. Offering Modbus output, machine makers can write the code to ensure equipment component parts can talk to everything else.

general use across the chemical, pharmaceutical and wastewater industries amongst others. The two variants can measure a multiple number of gases. The 430 measures mass flow for up to two gases, whereas the 450 is capable of measuring up to 8 gas applications. Four are onboard applications and as such the gas type, tube diameter and shape, line pressure and temperature are calibrated, and pre- programmed by the factory, but a further four applications are customisable by the end-user on site. Gas mixtures can be specified via the human machine interface (HMI) or via HART or a laptop using the Field Information Manager (FIM) software. It means one device can meet the needs of lots of different applications. Its flexibility extends to changing the pipe diameter or being able to program the device to specify if the gas flow is through a pipe or a duct. It is revolutionary in that this flexibility affords the requirement of only needing one spare instrument to fulfil multiple applications Both the FMT400 series and 200 series

offers the flexible components and installation has been simplified through clever design. A significant proportion of the cost of purchasing new instruments is in the installation and commissioning of them. Simple solutions such as offering weld on adaptors to reduce pipe alterations, offering pipe components with the correct measure of straight lengths. Thermal Mass Meters are commonly replacing aging orifice plates type meters. In order to reduce installation headaches, the wafer type process connection on ABB’s new thermal mass flowmeter models has been designed to be the same size as the orifice plate which means our wafer pipe component can replace the old orifice plate and be fitted very quickly and cost effectively. fmt700 - These devices are used predominantly for automotive combustion efficiency testing. They are used prolifically in the automotive industry, however more broadly the combustion efficiency principle is as relevant to

INS-APR21-TUV SUD.qxp_Layout 1 07/04/2021 11:32 Page 1

the combustion engine of a garden strimmer as to a high-end application on testing Formula one racing engines.

anything else We should knoW?

Yes, an additional point to note is that the FMT400 and many other instruments are compatible with ABB Ability verification for measurement devices. Calibration is important for thermal mass flow meters and it can be costly both in terms of the expertise required to perform the calibration and any downtime incurred by the instrument being offline. The ABB Ability SRV500 software allows the instrument to be checked against its original calibration and manufacturing parameters. This data is stored onboard and during verifications the meters performance is checked against this ‘fingerprint’ data. If the verification test results are within the limits set the meter will pass, and a certificate of verification for the instrument will be produced with a clear ‘Pass’ or Fail’ notification. ABB Ability SRV500 verification software

is helping customers to reduces the cost of ownership and therefore increase productivity and is available on all types of instrumentation from thermal mass flowmeters, pressure transmitters, temperature sensors and positioners.


Webinar: What do you know about

hydrocarbon allocation? A journey from theory to practical cases 16 June 2021 10am BST

Join TÜV SÜD National Engineering Laboratory’s Dr Bruno Pinguet in this event to find out to hear about

 Different allocation systems  Allocation by-difference  Proportional-based allocation  Uncertainty-based allocation  Data validation TÜV SÜD National Engineering Laboratory, East Kilbride, Glasgow, G75 0QF +44 (0)1355 593700

Instrumentation Monthly April 2021


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