A pressure scanner needs a range that suits the pressures expected in the test. Too narrow a range may miss changes in operating conditions. A much wider range needs a closer look at whether the accuracy is adequate for small pressure measurements. Consider what you are measuring, the normal pressure range, and any expected peaks together. WINDTUNER can help configure pressure scanners and related equipment for wind tunnel, engine, and other development tests.
Start with the type of pressure
Before discussing the range, establish what the reading represents. Model surface pressure, pressure from a probe, and the difference between two measurement points may call for different connections and equipment configurations. For differential measurements, the pressure difference determines the required measurement range, but the pressure at each input must also remain within the equipment limits. A request to measure wind tunnel pressure needs more detail before a suitable range can be selected.
WINDTUNER intelligent pressure scanners are available in standard, differential pressure, and atmospheric pressure versions. The differential version measures the pressure difference between two points; the atmospheric version measures atmospheric pressure. Once the task is defined, the range and interface requirements can be checked for the appropriate version. This gives the selection a clearer basis than choosing an upper pressure limit first.
WINDTUNER intelligent pressure scanners are available in standard, differential pressure, and atmospheric pressure versions. The differential version measures the pressure difference between two points; the atmospheric version measures atmospheric pressure. Once the task is defined, the range and interface requirements can be checked for the appropriate version. This gives the selection a clearer basis than choosing an upper pressure limit first.
Include changes in test conditions
Engineers often know the pressures reached during steady operation. A test may also involve startup, changes in incoming flow, or transitions between operating conditions. Include the expected pressures during those stages, rather than supplying only one steady-state reading. If complete data are not yet available, explain the estimates you have and where uncertainty remains, then discuss the range with the equipment supplier.
The margin needed depends on the pressure changes and the equipment limits. There is no single percentage that suits every project. Measurement range and overpressure tolerance also mean different things: surviving a pressure surge does not establish that the instrument can measure at that pressure within its normal specifications. Any overpressure requirements need a separate check.
The margin needed depends on the pressure changes and the equipment limits. There is no single percentage that suits every project. Measurement range and overpressure tolerance also mean different things: surviving a pressure surge does not establish that the instrument can measure at that pressure within its normal specifications. Any overpressure requirements need a separate check.
Read the accuracy specification alongside the range
Some pressure instruments specify error as a percentage of full scale. With that type of specification, the same percentage applied to a larger full-scale range gives a larger allowable error in pressure units. Comparing accuracy percentages alone can therefore be misleading. Check the range behind the figure and whether the error in pressure units is acceptable for the test.
This matters when the pressure changes of interest are small. A range may contain every expected reading without being suitable for resolving the differences the experiment needs to detect. Review resolution, temperature conditions, and the complete accuracy specification as well. More digits on a display do not establish greater measurement accuracy. WINDTUNER can review the specifications of a proposed configuration against the pressure range required.
This matters when the pressure changes of interest are small. A range may contain every expected reading without being suitable for resolving the differences the experiment needs to detect. Review resolution, temperature conditions, and the complete accuracy specification as well. More digits on a display do not establish greater measurement accuracy. WINDTUNER can review the specifications of a proposed configuration against the pressure range required.
Check the needs of each measurement point
Pressure ranges may differ between locations in a test with multiple measurement points. Group the points by their pressure requirements before checking whether an equipment configuration is suitable. Channel count, tubing connections, and data recording need to be planned together with the ranges. Before testing, check for leaks and blockages so that a tubing problem is not mistaken for a range selection problem.
When specifying a pressure scanner range, tell WINDTUNER the pressure type, expected range, changes in operating conditions, and pressure differences you need to observe. Include the number of measurement points and the operating environment. WINDTUNER intelligent pressure scanners integrate pressure sensor modules and data acquisition, with measurement and control software available for recording. Clear measurement requirements help match the range to both the test conditions and the analysis that follows.
When specifying a pressure scanner range, tell WINDTUNER the pressure type, expected range, changes in operating conditions, and pressure differences you need to observe. Include the number of measurement points and the operating environment. WINDTUNER intelligent pressure scanners integrate pressure sensor modules and data acquisition, with measurement and control software available for recording. Clear measurement requirements help match the range to both the test conditions and the analysis that follows.
