A pneumotachograph flow sensor converts the flow of gases through it into a proportional signal of pressure difference on either side of a central mesh whose design ensures a signal linearity over a range of flow rates. Using a differential pressure sensor, the pressure drop over the mesh is measured. With this measurement and a […]
As described here, manual adjustment of a baseflow might be a cumbersome process. It requires multiple steps which must be repeated every time if the intentional leak or the ventilator settings are changed. To simplify daily work, the FlowAnalyser PRO offers adaptive baseflow adjustment to compensate for leakage automatically. But how does it work? The […]
What should be considered when measuring inhalation (Vti) and exhalation (Vte) volumes of ventilators with an intentional leak?For precise measurement of the tidal volumes, the leak flow must be compensated. An intentional leak, at the patient’s mouth, falsifies the inhalation and exhalation volumes. Intential leaks are common in non-invasive ventilators for CO2 washout. The leakage […]
Feedback from biomedical engineers has shown us that many measurement errors of flow are caused by a mismatch between the gas standards used by the device under test (e.g. a medical ventilator) and the gas flow analyzer used for flow and volume testing. Keep in mind both devices are measuring the same gas flow but […]
In mechanical ventilators, the inspiratory and expiratory volume (Vti, Vte) and minute volume (Vi and Ve) must be precisely checked with a gas flow analyzers or a ventilator tester. Ventilator testers, from different manufacturers, can measure flow and volume. However, flow accuracy is strongly temperature dependent and needs to be temperature compensated. This is particularly […]
From Matthias van der Staay. Correctly selected trigger settings in a ventilator tester are important for the measurement accuracy of breath-based parameters in medical ventilators such as tidal volume, minute volume or breath rate. Depending on the patient circuit configuration and the selected ventilation mode or settings, adjustments to the trigger settings are usually required. […]
Customers require cost-effective and high performance instrumentation to meet their specific requirements. Capillary thermal mass flow meters and controllers have been able to meet these criteria in a broad range of process applications. Thermal mass flow technology measures the flow of gases directly at the molecular level, which makes it an industry standard for mass […]
With comparative measurements and a management system in accordance with the SN EN ISO/IEC 17025 standard assessed on a regular basis by EURAMET, METAS provides proof of its metrological competence within the framework of the “Mutual recognition of national measurement standards and of calibration and measurement certificates issued by national metrology institutes» (CIPM MRA). The […]