Feature sponsored by Test & measurement


accurate measurement. Beyond this the instrument also needed a low response time and the company were keen to find a solution which would reduce the use of expensive gases for calibration. In comparisons between devices supplied by the major vendors, the engine manufacturer found that the ABB AZ10 achieved an accuracy better than ±0.05 per


cent of the actual O2 level. To ensure even greater accuracy, the test phase included the installation of three of the AZ10s in a cabinet, comparing their accuracies and performing local calibration if one of them drifts out of the desired accuracy limits. The device’s use of low-drift sensor technology means that it experiences a


drift of only 1.0 per cent O2 per month, compared to other vendors’ drift of two


per cent O2 per month. This means that using the AZ10, ship operators need only perform a single-point calibration every few months instead of a two-point calibration every month, presenting the scope for significant OpEx savings.


As a further benefit, calibration of the AX10 uses air rather than expensive calibration gases. ABB also provides a calibration certificate with every cell, meaning that the user does not have to carry out any calibration - they can simply put in the calibration factors from the certificate and start measuring. There is also an optional auto-calibration unit. This allows calibration to be performed


Instrumentation Monthly February 2023


manually or automatically and can be triggered by hand or on a time schedule. Maintenance is also easy, particularly important on a ship at sea. Featuring an easy cell release and site-serviceable probe, the AZ10 can be repaired quickly and easily on site with basic tools. The customer can replace the ABB sensor in a few minutes. Another useful feature is the on-board


“Fuel Gauge”. This lifetime indicator gives the user advanced warning of the operational


efficiency of the device, allowing time to schedule repair or replacement of the cell. The ABB AZ10 carries marine certification


IACS E10 Rev. 5.0 2006 Test Specification for type approval and ABS certificate 15- LD1262098-PDA.


ABB has so far supplied over 700 AZ10s to MAN Engines’ main engine building licensees in South East Asia.


ABB www.abb.com 55


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