The additionally available sensors – the MultiGasAnalyser OR-703 for the FlowAnalyser/FlowAnalyser PRO and the oxygen sensor for the measuring devices CITREX H3, CITREX H4 and CITREX H5 or the oxygen sensor for the FlowAnalyser – can be replaced at any time. To ensure the accuracy and reliability of the gauges, users must not replace other sensors themselves. Should this be necessary, IMT Analytics will carry out the change during the annual calibration and maintenance.