Water Journal : Water Journal June 2015
water business water June 2015 98 water Business DIAGNOSTICS AND VERIFICATION IN A ‘HEARTBEAT’ Endress & Hauser’s new generation of Proline Promag 400 electromagnetic flowmeters are fitted with Heartbeat TechnologyTM . Heartbeat Technology provides continuous or on-demand diagnostics, monitoring and verification to ensure your flowmeter is functioning correctly, independent of process and ambient conditions. This unparalleled self-monitoring capability offers complete flexibility to plan proof-testing and other maintenance with minimal effort and exposure of personnel. Heartbeat Technology is easy to use and can be activated at the touch of a button without interrupting the process. It is accessible via the local display, the webserver or system integration interfaces, so it needs no on-site presence. Seamless and traceable verification results are stored permanently and can be retrieved at any time. The reliability of your measurement is ensured in three ways: 1. Diagnostics Diagnostics is based on the continuous testing of a device’s health during ongoing operation. You are immediately warned if the device has reached a critical condition, enabling you to take quick and appropriate action. These messages are interpreted in accordance with NAMUR NE 107 and are displayed by the device as a diagnostic event. This also includes direct instructions on what to do next, ensuring that the process can be up and running again quickly in the case of a shutdown to prevent unnecessary maintenance measures. 2. Monitoring Condition monitoring is recommended for applications with demanding operating conditions or where the device is subject to wear, for example from corrosion or abrasion. Condition monitoring recognises if the measuring performance or the integrity of the device is impaired. It also recognises trends in the secondary measured values and can evaluate the relationships between individual parameters, reducing the risks of an unexpected failure. Condition monitoring also makes it possible to display temporary, process-specific faults that neither calibration nor verification can detect, since they only take a snapshot of the device status. 3. Verification Verification can be used to take an immediate snapshot of the device status, to demonstrate that the flowmeter meets the manufacturer’s technical specification requirements. A hard copy verification report is automatically produced and stored in the meter’s internal memory. The report includes a qualitative assessment of the checked parameters. It can be utilised to meet the audited compliance requirements of either ISO 9001 quality systems as traceable documentation, or in safety related applications, as documentation of the proof test, for SIL-based functional safety systems. Heartbeat Verification extends the test coverage of the inbuilt diagnostics circuits. The meter momentarily comes offline to allow for the independent redundant reference signals to be processed through the standard electronic signal chain. The offline period is typically no longer than one minute. The independent reference signal for an electromagnetic flowmeter comprises an internal redundant reference voltage, which is used solely for verification purposes. The redundant reference is traceable back to factory references and is constantly monitored to ensure long-term stability and zero drift during the life of the instrument. Testing the entire signal chain from coil excitation, through electrode measuring circuit and, finally, to signal output ensures the highest possible “total test coverage”, minimising the potential for random undetected failures. With a total test coverage typically in the order of 95%, Heartbeat Verifications ensure that the meter remains as accurate and repeatable as when calibrated at the factory during manufacture. Being completely internal, it is quick and easy to use, reducing the time for maintenance and increasing plant or process availability. It is also possible to perform verifications remotely through integration with a digital control system or connection through to an asset management system such as FieldCare. Specifically developed for the water industry, with Heartbeat Verification, in addition to being able to perform completely internal verification, it is also possible to perform external verification. External verification adds measurement of the internal reference voltage with a third- party calibrated and traceable multimeter. This provides an additional path of traceability, through to commonly accepted local or national accreditation bodies. How does it work? The diagnostic test functionality is embedded in the electronic modules in the form of an internal reference system. This means the traditional method of verification, with traceable, external measuring instruments, is no longer necessary. Often the intervals between labour-intensive recalibrations can be extended. There is also the option to integrate the process into a higher-level control system or asset management system. All of this saves time and costs, while virtually eliminating the possibility of interference due to incorrect handling. Heartbeat Technology is an accredited and traceable internal verification on- demand technology that allows users to fulfil the requirements of third-party approved meter verification, based on the highest possible test coverage. For more information on Heartbeat Technology please call 1800 ENDRESS or visit www.au.endress.com/flow.
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