The digital pressure gauge is a versatile and widely used instrument in various industries. Whether it's employed as a reference standard for volume measurement or as a working measuring device, it offers convenience and efficiency. However, several key factors must be considered to ensure its accuracy and reliability. In this article, technicians from Jinli Instruments discuss the stability, maximum allowable error, control function influence, pressure transmission medium requirements, and environmental conditions that affect the performance of digital pressure gauges.
A digital pressure gauge is essentially a pressure sensor that converts pressure into an electrical or digital signal. This signal is then processed by a signal processing unit and displayed on a screen in digital form. It can measure absolute pressure, gauge pressure, and differential pressure. With a wide range of applications and user-friendly operation, digital pressure gauges are popular in many fields. However, proper usage and understanding of their technical characteristics are essential to avoid errors and ensure accurate results.
1. **Stability**: Stability is a critical parameter when using a digital pressure gauge as a primary standard. According to JJG875-2000, a stability test has been introduced to ensure reliable performance. For gauges with an accuracy class of 0.05 or higher, the change in reading between two consecutive calibrations should not exceed the maximum allowable error. If the stability check fails, the calibration interval is usually reduced to six months, and the device cannot be used as a primary standard for value transfer.
2. **Maximum Allowable Error**: The maximum allowable error during mass transfer must meet specific ratios. While the accuracy class is important, the actual maximum error must also be evaluated based on the range. For example, a 0.01-class digital pressure gauge with a range of 7000 kPa will have a maximum error 70 times greater than one with a range of 100 kPa. This highlights the importance of considering both the accuracy class and the range when selecting a digital pressure gauge.
3. **Impact of Control Functions**: Many modern digital pressure gauges include automatic control features. These functions can significantly affect measurement results, depending on the control method and technical specifications. For instance, the default dynamic control retention limit of ±0.005% in some devices may impact measurement uncertainty. Users should analyze how these control parameters influence the readings and adjust them accordingly.
4. **Pressure Transmission Medium**: The choice of pressure transmission medium is crucial for maintaining accuracy. Different sensors have varying requirements for the medium, and improper use can lead to inaccuracies or damage. Oil contamination in gas media and dirt in liquid media are common issues. Filtration systems are often used to remove impurities, and filters must meet specific criteria such as filtration accuracy, capacity, strength, and corrosion resistance.
5. **Environmental Factors**: Environmental conditions like temperature, humidity, electromagnetic interference, air flow, and atmospheric pressure changes can all affect the performance of a digital pressure gauge. Temperature is typically the most significant factor, influencing almost all types of sensors. Ensuring the gauge operates within the specified environmental limits is essential for accurate measurements.
6. **Other Considerations**: Battery-powered devices require attention to voltage levels, as low or high voltages can introduce errors. Some gauges are also affected by local gravity, especially if they are placed at an angle. Regular checks and maintenance are necessary to maintain performance, and verification should be done using more stable reference instruments like piston or liquid pressure gauges.
**Conclusion**: Proper use of digital pressure gauges involves careful consideration of stability, accuracy, control functions, transmission media, and environmental conditions. Calibration personnel should follow best practices and maintain detailed records for each device. Laboratories must strictly adhere to standards and keep technical files up to date to ensure consistent and reliable measurements.
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