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Calibration Specification for Vehicle-Mounted Pump Pressure Sensors
Release time:
2026-06-22
Source:
Author:
Summary:
Pressure sensors are critical monitoring components in vehicle‑mounted pump hydraulic systems, and their accuracy directly impacts the safe operation and performance of the equipment. Regular calibration of pressure sensors ensures the reliability of measurement data, providing an accurate basis for equipment operation and maintenance.
I. Preparations Before Calibration
Calibration Condition Confirmation
Ensure that the calibration environment meets the requirements:
1. Ambient temperature: 20±5℃ , avoid drastic temperature changes
2. Relative humidity: ≤85% , no condensation phenomenon
3. Vibration Interference: The calibration platform shall be stable and free from vibration.
4. Electromagnetic Environment: Keep away from strong electromagnetic interference sources.
Calibration Equipment Preparation
Required instruments and tools:
Standard pressure gauge: accuracy class 0.25 Level and above
Pressure source: manual pump or electric pressure calibrator
Digital multimeter: accuracy of 4.5 digits or higher
Dedicated connecting fittings and transition piping
II. Calibration Procedures and Methods
Zero calibration
Sensor Zero Adjustment:
Ensure the pressure sensor is at atmospheric pressure.
Record the zero-point output current or voltage value.
Adjust the zero-point potentiometer to set the output to 4mA or 0V
Repeat the check three times to confirm zero-point stability.
Full-scale calibration
Range Accuracy Adjustment:
1. Slowly apply pressure up to the sensor’s full-scale range.
2. Compare the standard indicated value with the sensor output.
3. Adjust the range potentiometer to match the output.
4. After depressurization, check whether the zero point has drifted.
III. Linearity Test
Multi-point calibration
Select calibration points across the entire measurement range:
0%、25%、50%、75%、100% Range point
Measure once in the forward stroke and once in the reverse stroke.
Record the output values at each point and their corresponding standard values.
Calculate the linear error and hysteresis.
Data Processing and Analysis
Calibration Data Analysis Method:
1. Calculate the measurement error at each point.
2. Determine the linear regression equation.
3. Analysis of Repeatability Error
4. Assess sensor performance level
IV. Key Points for On-Site Calibration
Online calibration
Equipment calibration method without shutdown:
Install a tee fitting upstream of the sensor.
Connect a standard pressure gauge for comparison.
Record performance under working conditions.
Note the impact of system pressure fluctuations.
Safety Precautions
On-site calibration safety requirements:
1. Confirm that the system has been depressurized.
2. Operate using explosion-proof tools.
3. Implement effective oil-leak prevention measures.
4. Set up safety warning signs.
V. Processing of Calibration Results
Passing Criteria
According to the accuracy requirements:
Basic error: not exceeding the range of ±0.5%
Hysteresis: not exceeding the span of ±0.25%
Repeatability error: not exceeding the range of ±0.1%
Zero drift: 24 Not exceeding the range per hour ±0.1%
Calibration Record Completion
Standard Recording Requirements:
1. Device Information and Environmental Conditions
2. Use Standard Instrument Details
3. Data Records for Each Calibration Point
4. Calibration Conclusion and Handling Recommendations
VI. Troubleshooting Common Issues
Zero-drift correction
Handling when the zero point is unstable:
Check sensor sealing
Confirm that the supply voltage is stable.
Insulation of the detection signal line
Consider sensor aging and replacement.
Nonlinear correction
Handling measures for nonlinear output:
1. Inspect the sensor installation status.
2. Confirm that the medium is clean and free of impurities.
3. Perform linear compensation using software.
4. Replace the sensor with degraded performance.
VII. Maintenance and Management Recommendations
Calibration Cycle Determination
Developed based on usage:
New sensor: Must be calibrated before use.
Normal use: each 6 Calibrated once a month.
Important parts: each 3 Calibrated once a month.
Special operating conditions: Shorten the cycle as needed.
Establishment of Management Systems
A comprehensive management system:
1. Establish a sensor calibration record.
2. Develop a calibration work instruction.
3. Train professional calibration personnel
4. Implement calibration quality monitoring
Conclusion
Accurate calibration of in‑vehicle pump pressure sensors is a critical step in ensuring the safe and reliable operation of the equipment. By establishing standardized calibration procedures, using qualified calibration instruments, and training skilled calibration personnel, the accuracy of pressure measurement data can be guaranteed. It is recommended to develop a comprehensive sensor management system, strictly adhere to prescribed calibration intervals, and maintain complete calibration records, thereby providing robust assurance for the safe and dependable operation of the equipment. At the same time, emphasis should be placed on analyzing and leveraging calibration data to promptly identify potential issues and continuously enhance the overall level of equipment management.
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
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