Industry News | Airtightness Test_Waterproof Tester_Industry Science

Q1.

Why are the leak tester results inconsistent each time?

1. Possible Causes

1. Issues with the tester itself

Sensor precision degradation: Aging pressure or flow sensors can cause data fluctuations
Air source pressure instability: Inconsistent pressure from pumps or sources affects inflation/vacuum accuracy
Inconsistent valve response: Variance in solenoid valve switching time leads to pressure control deviation

2. Testing condition changes

Environmental fluctuations: Temperature variations affect gas volume and pressure readings
Fixture seal failure: Gaps between fixture and workpiece may cause false leaks
Workpiece interference: Material deformation or residual liquid causes temporary false positives

3. Human operational factors

Insufficient or inconsistent fixture clamping force
Non-standardized testing procedure (e.g., varying inflation time)
Testing started before system stabilization

2. Solutions

1. Device optimization

Regular calibration and maintenance: Calibrate sensors periodically and replace aging components
Hardware upgrades: Use higher-precision sensors and faster-responding valves
Improve air supply stability: Add regulators or air tanks to ensure consistent supply pressure

2. Controlled testing environment

Constant temperature and humidity: Keep testing area in a controlled environment
Pre-process workpiece: Clean surface and follow standard clamping procedures
Software compensation: Use algorithms to compensate for temperature/humidity effects

3. Standardized operation process

Standard operation manual: Define inflation time, stabilization time, etc.
Automation over manual operation: Use robots for consistent clamping and testing
Operator training: Ensure strict adherence to operation guidelines

Q2.

Why does the accuracy drop when the leak tester operates above 500kPa?

1. Possible Causes

1. Nonlinear sensor response

Sensor range limitations: Pressure sensor may exceed optimal linear range at high pressures
Temperature drift: Sensor heat buildup at high pressure can cause zero-point shift if not temperature-compensated

2. Sealing and leakage issues

Seal material deformation: High pressure may over-compress O-rings, causing microleaks
Structural deformation: Chamber or piping may elastically deform under high pressure

3. Air supply stability and response speed

Insufficient air pump capacity: Maintaining stable high pressure may be difficult if pump power is lacking
Valve response delay: Higher resistance under high pressure reduces valve control accuracy

4. Changes in gas physical properties

Gas compressibility effects: Gases deviate from ideal behavior under high pressure
Adiabatic effect: Rapid inflation raises gas temperature, affecting pressure decay curve

2. Solutions

1. Hardware optimization

Use high-precision sensors: Select sensors with wide range and minimal nonlinearity
Reinforce sealing design: Use high-pressure-rated seals or metal sealing structures
Anti-deformation structural design: Use thick-walled metal chambers and validate deformation range

2. Gas circuit and control system improvement

Dynamic temperature compensation: Real-time temperature monitoring to adjust gas equations
Optimized pressure decay model: Use nonlinear leakage models instead of linear approximations
High-pressure air pump: Choose more stable air supply systems designed for high pressure

3. Standardized testing procedures

Extend stabilization time: Define and enforce thermal balance duration at high pressure
Segmented testing strategy: Use different parameters for low- and high-pressure stages
Pre-pressurization step: Reduce thermal drift through pre-pressurization

Q3.

What is the working principle of an airtightness tester?

Q4.

What is the testing range of airtightness equipment?

Q5.

Can the waterproof tester meet usage requirements under different temperatures or environmental conditions?

Q6.

How accurate is the airtightness tester?

Q7.

Do you provide equipment training and after-sales service?

Q8.

Is the maintenance of the airtightness tester complicated?

Q1.

What should I do if the test result is negative?

Possible Causes:

1. Temperature changes

Temperature changes in the environment or the product under test can cause gas expansion or contraction, affecting pressure readings and possibly resulting in negative leakage values. Especially after rapid inflation, the gas heats up and cools down afterward, causing pressure to drop.

2. Product or fixture deformation

The product may deform under pressure, changing the internal volume and resulting in pressure changes. Likewise, minor deformations in the fixture may affect test results.

Solutions:

1. Temperature Control

Stable environment: Keep testing environment temperature stable to avoid pressure fluctuations
Pre-heat/cool workpieces: Ensure the tested part is at the same temperature as the environment
Increase balance time: Allow time for temperature stabilization after inflation
Temperature compensation: Use devices or algorithms that support temperature compensation

2. Equipment Inspection

Fixture inspection: Regularly inspect fixtures and pipelines for deformation or damage
Seal replacement: Check and replace aged or damaged seals
Stable volume: Ensure consistent test volume to avoid pressure changes from loose fixtures
Device calibration: Fully calibrate equipment to ensure sensor accuracy

Q2.

Why are the test results inconsistent?

Possible Causes:

1. Inconsistent operation

Different handling methods, clamping force, inflation time, and balance time may cause result variation.

2. Environmental factors

Temperature and humidity fluctuations can affect result stability, especially in uncontrolled environments.

3. Equipment calibration issues

Lack of regular calibration or improper calibration can lead to sensor aging or drift, reducing consistency.

Solutions:

1. Standardize operation

Create SOPs: Define detailed procedures and parameters
Operator training: Provide unified training and assessment
Use automation: Apply fixtures or automation for consistency

2. Control environment

Control temperature/humidity: Conduct testing in a stable environment
Avoid airflow: Stay away from air vents or doors/windows
Monitor conditions: Record and monitor environmental data

3. Regular calibration

Calibration schedule: Follow the recommended frequency
Professional calibration: Use standard tools and qualified personnel
Record tracking: Keep logs to track performance changes

Q3.

How to troubleshoot a leak tester malfunction?

If the leak tester malfunctions, follow these steps to identify and resolve the issue:

Check power and connections

Ensure the device is properly powered, the power cable is intact, and all connections to air source or computer are secure.

Check error codes

Refer to the error code list in the user manual to understand the cause and solution of the error shown on the display.

Clean and maintain

Regularly clean the air system, sensors, and seals to remove dust or debris. Check for aged or damaged seals and replace if necessary.

Restart the device

Try turning off the power, wait a few minutes, then restart the device. A simple reboot may solve temporary issues.

Contact technical support

If the issue persists, contact our technical support team with detailed fault description and device information for further assistance.

Q4.

FAQ

1. Possible Causes

1. Issues with the tester itself

2. Testing condition changes

3. Human operational factors

2. Solutions

1. Device optimization

2. Controlled testing environment

3. Standardized operation process

1. Possible Causes

1. Nonlinear sensor response

2. Sealing and leakage issues

3. Air supply stability and response speed

4. Changes in gas physical properties

2. Solutions

1. Hardware optimization

2. Gas circuit and control system improvement

3. Standardized testing procedures

Differential Pressure Method

Flow Method

Direct Pressure Method

Possible Causes:

1. Temperature changes

2. Product or fixture deformation

Solutions:

1. Temperature Control

2. Equipment Inspection

Possible Causes:

1. Inconsistent operation

2. Environmental factors

3. Equipment calibration issues

Solutions:

1. Standardize operation

2. Control environment

3. Regular calibration

Check power and connections

Check error codes

Clean and maintain

Restart the device

Contact technical support