Digital pressure gauges are widely used in various industries due to their versatility and efficiency. Whether they serve as reference standards for volume measurement or as working instruments, they offer convenience and accuracy. However, several key considerations must be taken into account during their operation. In this article, Jinli Instrument technicians explore the stability of digital pressure gauges, maximum permissible error, the impact of control functions on measurement results, and the requirements for the transmission medium and environmental conditions to ensure reliable and accurate output.
A digital pressure gauge is a type of 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 digital screen, allowing for the direct reading of absolute, gauge, or differential pressure. With a wide range of applications and user-friendly operation, digital pressure gauges are commonly used across multiple fields. To maximize their performance, users must be aware of several important factors during use.
1. Stability is a critical technical parameter when using digital pressure gauges as a primary standard. According to the "Calibration Regulations for Digital Pressure Gauges" (JJG 875-2000), stability tests are conducted to ensure consistent readings over time. If the indication changes beyond the maximum allowable error between two verification periods, the device may not be used as a primary standard. The calibration interval is usually reduced to no more than six months if stability checks fail.
2. The maximum allowable error should meet the mass transfer ratio requirements. While the accuracy level is important, it's also essential to calculate whether the maximum error aligns with the specific application. For example, a 0.01-level digital pressure gauge has a much larger tolerance at a 7000 kPa range compared to a 100 kPa range. Understanding these differences helps in selecting the right instrument for precise measurements.
3. Digital pressure gauges with automatic control functions can significantly affect measurement results. Their control mode, response time, and precision vary greatly. Users should analyze how these features influence the final readings. Some devices have default settings like dynamic control limits, which may affect accuracy if not adjusted properly.
4. The pressure transmission medium plays a crucial role in maintaining measurement accuracy. Contaminants such as oil, dirt, or impurities can damage the gauge or distort readings. Proper filtration systems are often required to remove these contaminants. Different media (gas or liquid) demand different filter specifications, including filtration accuracy, capacity, and resistance to corrosion.
5. Environmental factors like temperature, humidity, electromagnetic interference, air flow, and atmospheric pressure can all affect the performance of digital pressure gauges. Among these, temperature is the most common and impactful factor. It’s essential to follow the manufacturer’s guidelines to ensure optimal operation under varying conditions.
6. Additional considerations include battery voltage for portable devices and gravitational acceleration effects. Low battery power can introduce errors, while improper placement can affect readings. Regular maintenance and periodic verification using piston or liquid pressure gauges are recommended to maintain accuracy over time.
7. In conclusion, proper use of digital pressure gauges requires attention to stability, accuracy, control functions, transmission media, and environmental conditions. Calibration personnel should develop good practices, and laboratories should maintain detailed records for each device. By following these guidelines, users can ensure reliable and precise pressure measurements in any application.
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