A pressure gauge calibration station is a device used to calibrate and verify the accuracy of various types of pressure gauges. It can generate known pressure through a standard pressure source and compare it with a calibrated pressure gauge to confirm its reading accuracy. Pressure gauge calibration stations are widely used in industrial production, scientific research experiments, and measurement and testing fields.
The pressure gauge calibration station generates a certain pressure through a pressure source, and transmits the pressure to the calibrated pressure gauge and standard pressure gauge or sensor through a pressure regulation system. At this point, the operator will compare the verified pressure gauge reading with the standard pressure gauge reading. If the readings are consistent or within the specified error range, the pressure gauge calibration is qualified. Otherwise, the verified pressure gauge needs to be calibrated or repaired.
The main components of the pressure gauge calibration table
Pressure source: Provides standard pressure values that can generate negative, positive, or high pressure. Common pressure sources include pneumatic pressure sources.
Pressure sensor: As a calibration benchmark, the accuracy level of standard pressure gauges is usually high, ensuring the accuracy and reliability of the generated pressure.
Pressure regulation system: used to accurately regulate the output pressure, ensuring that the required pressure points can be generated for verification. The regulating system usually uses components such as fine-tuning valves and shut-off valves.
Pipeline and connectors: Connect the pressure source, standard pressure gauge, and verified pressure gauge to ensure accurate pressure transmission.
Fixture or connection device: used to fix the pressure gauge to be verified and stably connect it in the system.
Display system: The pressure gauge calibration station may be equipped with a digital display to show pressure values or provide data recording functions.
The pressure gauge calibration table is an important equipment to ensure the accuracy and reliability of pressure gauges, widely used in industries that require precision pressure measurement and control. The pressure gauge calibration table should work in a stable temperature and pressure environment to reduce the influence of external factors on the measurement results. Standard pressure gauges or sensors need to be regularly sent to a professional metrology department for calibration to ensure their accuracy. When using, ensure that the pressure gauge to be calibrated is tightly connected to the calibration table without leakage. The calibration of pressure gauges with different pressure ranges and types should select appropriate media, such as gas or liquid, to prevent damage to equipment or affect accuracy.
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Correctly use the pressure gauge calibration table to ensure the accuracy of calibration results and safe operation of equipment. The following are the general steps for using a pressure gauge calibration bench:
1. Preparation work
Check the equipment: Before operation, check the calibration table, standard pressure gauge, pressure gauge to be calibrated, and all connecting pipelines to ensure that the equipment is intact, without leaks, damages, or abnormal conditions.
Pressure medium: Select the appropriate pressure source and medium based on the working pressure range of the pressure gauge to be verified, and connect them properly.
Confirm the status of the standard pressure gauge: Ensure that the standard pressure gauge or pressure sensor used on the calibration bench has been effectively calibrated and is within its validity period, with an accuracy level higher than that of the verified gauge.
2. Connect the pressure gauge
Fixed calibrated pressure gauge: Connect the pressure gauge to be calibrated to the pressure output port of the calibration table through a connecting pipe or fixture. Ensure that the interface connection is secure and leak free.
Connect the standard pressure gauge: Connect the standard pressure gauge or sensor that comes with the calibration bench to the corresponding interface to display the standard pressure value during the calibration process.
Check sealing: gradually apply a small amount of pressure, check for leaks at the connection points, and tighten the joints if necessary.
3. Gradually increase pressure
Slowly increase pressure: When using, slowly increase the pressure to avoid applying excessive pressure instantly, prevent damage to the verified pressure gauge, or affect the test results.
Monitoring pressure changes: During the gradual pressurization process, the readings of the standard pressure gauge and the calibrated gauge should increase synchronously. Observe the changes in the pressure gauge at any time and maintain stable pressure.
4. Record test information
Record data: Record the readings of the standard pressure gauge and the calibrated gauge at different pressure points. Typically, several typical pressure points such as 0%, 25%, 50%, 75%, and 100% full-scale pressure are selected during the calibration process.
Maintain pressure stability: At each pressure point, wait for the pressure to stabilize before reading and recording the values to avoid reading deviations caused by pressure fluctuations.
5. Gradually reduce pressure
Slow pressure relief: After completing the calibration of all pressure points, slowly release the pressure through the control valve or pressure relief valve to avoid sudden pressure reduction that may cause equipment damage. Gradually reduce the pressure and record the readings of the calibrated and standard gauges at different pressure reduction points to ensure the accuracy of the calibration results.
6. Comparison error
Calculation error: Calculate the error of each pressure point based on the difference in readings between the recorded standard pressure gauge and the verified gauge. Error can be expressed in absolute value or relative percentage.
Evaluate whether it is qualified: Based on the accuracy requirements of the pressure gauge, such as 0.25%, 0.5%, etc., determine whether the pressure gauge is within the allowable error range. If it exceeds the specified error range, the table needs to be recalibrated or repaired.
7. Complete verification
Remove the pressure gauge to be verified: After ensuring that the pressure is completely released, remove the verified pressure gauge and inspect the various connecting parts of the verification table.
Cleaning and maintenance: After the calibration is completed, clean the calibration table to ensure that the equipment is clean and tidy, and extend its service life.
8. Record data
Record verification data: Fill in the verification results in the verification record table, record the standard value of each pressure point, the reading of the verified table, the error value, and the verification conclusion.
Provide verification report: If the verification table is used for formal verification or measurement, a verification certificate needs to be issued according to relevant standards to confirm that its measurement performance meets the requirements.
During the verification process, the applied pressure should not exceed the rated maximum pressure of the verified table, otherwise it may damage the equipment. The accuracy of the standard pressure gauge should be higher than that of the verified gauge by at least one level. The calibration bench and standard pressure gauge need to be regularly calibrated and maintained to ensure their long-term stability and reliability. Ensure that the operating environment temperature and humidity of the calibration station are moderate, and avoid external environmental factors from interfering with the calibration results. Through these steps, the pressure gauge calibration station can accurately calibrate the pressure gauge, ensuring that it provides reliable pressure readings in practical applications.