Why are Pressure Reading Rates, Filters and Data ...

Pressure plays a crucial role in a variety of physical measurements, such as flow, volume, level, and even environmental phenomena like tsunamis. Accurate pressure readings over time allow for precise determinations of various parameters being observed. Recent findings suggest that more data points significantly enhance the reliability of these measurements.

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In any process, monitoring pressure is essential. It equips engineers and operators with vital information needed for optimization or troubleshooting. The fluctuations in pressure throughout a process can be critical in finding efficient methodologies to produce higher quality products in exact quantities. Whether experiencing minimal changes or significant shifts, even small initial variances can lead to substantial differences in outcomes.

Since pressure can fluctuate rapidly, each data measurement serves as a snapshot in time. These snapshots can be compiled to develop a comprehensive understanding of the entire process. Consequently, the rate at which readings are taken is directly proportional to the accuracy of this cumulative data.

Achieving precise pressure measurements while accumulating a comprehensive set of high-resolution readings is paramount in any industrial application. Key decisions regarding the measuring locations, frequency, and duration of the pressure readings greatly impact effectiveness and outcome.

For instance, consider the measurement of flow over time where total delivered volume is the key metric. Flow meters calculate flow rates based on pressure differentials across restrictions, taking discrete pressure measurements along a straight pipeline. Here, flow “Q” depends on pressure “F(p)” at any point in time. The overall volume is derived from multiplying the flow rate by the duration. For instance, a steady flow of 10 gallons per minute yields 100 gallons in 10 minutes (refer to figure 1).

Figure 1

Conversely, when flow rate significantly fluctuates, the accuracy of the total delivered volume hinges on the frequency of readings (see figure 2).

Figure 2

Longer intervals between readings, Δt, introduce greater inaccuracies in volume calculations. In scenarios where processes change swiftly, closely spaced readings better approximate a continuous curve, subsequently enhancing accuracy in the total integrated from these instantaneous observations. The addition or removal of fluid in a system corresponds to the integral of flow rate over time.

Now, let's delve deeper into the parameters essential for precise pressure measurement within processes.

Reading Rates

Pressure transducers capable of swiftly collecting and transmitting pressure data markedly improve the accuracy in systems where pressure variables change quickly. In cases where detecting transient pressure spikes is vital, the reading rates become even more crucial.

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Mensor transducers can typically read and relay pressure values at a remarkable rate of 50 times per second in a call/response mode, while the CPT High-Speed Pressure Sensor can relay readings 250 times per second in a streaming output mode utilizing IEEE-754 format.

Filters

Every Mensor transducer incorporates filters to eliminate incorrect readings and effectively respond to rapid pressure changes specific to their application.

The filter in the CPT Precision Pressure Transducer averages previous readings with current ones, provided that the current measurement remains within a set percentage of the prior reading's full scale. If a current reading falls outside that range, the filter is overridden, and the current reading is shown unadjusted. This flexible response to rapid pressure variation is built into the transducer without the need for filter adjustments.

The default configuration includes a window of 0.008% FS and a filtering rate of 90%. For detailed specifications of each Mensor transducer, users can refer to their respective operation manuals.

Logging

Documenting each reading facilitates thorough analysis and optimization of processes. For instance, the WIKA CPG Digital Pressure Gauge can log as many as one million readings, utilizing rates of 1, 3, 10, or 50 readings per second. Data can be uploaded for analysis using the “My WIKA Device” app.

Similarly, Mensor transducers can transmit live data to external computers for collection and analysis or utilize the Mensor Calibration Utility Software to log data according to customizable capture parameters and timing. This software can gather readings and export them in CSV format for further use.

Conclusion

Understanding these parameters is crucial when selecting a pressure transducer or digital pressure gauge to meet process requirements or other measurement needs. By focusing on reading rates, filters, and data logging capabilities, one can gain an accurate, timely reflection of pressure variability, ultimately ensuring greater precision in final measurements.

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