The maintenance work of the fully automatic headspace sampler is crucial for ensuring its normal operation, extending its service life, and ensuring the accuracy of analysis results. The following are detailed maintenance steps and precautions:

1、 Daily maintenance of fully automatic headspace sampler (after each use)

1. Clean the external surface

Wipe the instrument casing with a soft dry cloth or slightly damp cloth, avoiding the use of corrosive cleaning agents or organic solvents to prevent damage to the surface coating.

Timely remove any residual liquid or solid impurities from the sample stage and keep the work area clean.

2. Check and clean the injection needle

After each experiment, the injection needle should be carefully checked for blockage. Special needle tools can be used to gently unclog, and if necessary, a new injection needle can be replaced.

If there are signs of bending or wear on the needle tip, it should be replaced immediately to ensure puncture accuracy and sealing.

3. Clean the sample bottle and cap pad

Pour out the waste liquid and thoroughly clean the inside of the sample bottle to remove any possible residual chemicals; Simultaneously replace the new bottle cap gasket to prevent cross contamination.

For samples with high volatility or high viscosity, it is recommended to pre treat them before use (such as ultrasonic cleaning).

4. Drain the waste liquid tank

Regularly empty the waste collection container to avoid liquid overflow causing corrosion or other safety hazards. Pay attention to wearing gloves and goggles when operating.

5. Check the connection status of the air circuit

Confirm that there is no leakage in the carrier gas pipeline and that all interfaces are tightly connected. Small air leaks can be detected by applying soapy water.

Ensure that the pressure reducing valve is working properly and the pressure is stable within the set range.

2、 Regular maintenance of fully automatic headspace sampler (monthly/quarterly)

1. Calibrate the temperature control system

Use a standard thermometer to verify the deviation between the actual temperature of the heating module and the displayed value, and adjust the parameters if necessary to ensure constant temperature accuracy (usually within ± 0.5 ℃).

Test the uniformity of the heating area of the headspace bottle to ensure that the temperature difference between different positions does not exceed the allowable range.

2. Lubricate mechanical components

Add an appropriate amount of lubricating grease to moving parts such as guide rails and screws to reduce friction losses and improve smooth movement. But be careful not to over absorb dust to avoid affecting performance.

3. Replace consumables

Regularly replace consumable parts such as seals, O-rings, and filter cartridges according to usage frequency to prevent poor sealing or contamination caused by aging.

Check if the quantitative ring is blocked or damaged, and if there are any abnormalities, clean or replace it in a timely manner.

4. Verify quantitative accuracy

Verify the repeatability and accuracy of the injection by injecting a standard solution of known concentration to ensure accurate quantification of ring volume. If significant deviations are found, it may be necessary to recalibrate or repair the relevant components.

5. Clean up internal dust accumulation

Open the chassis cover and use compressed air to blow away dust on the circuit board, especially in the area around the fan blades. Pay attention to power-off operation to avoid the risk of electric shock.

Clean up the debris at the heat dissipation port to ensure good ventilation and heat dissipation effect.

3、 Annual deep maintenance of fully automatic headspace sampler

1. Comprehensive disassembly and cleaning

Decompose the entire system into the smallest unit and thoroughly clean and disinfect all detachable parts. Pay special attention to hard to reach areas such as the interior of valves and pump bodies.

For metal parts, they can be soaked in alcohol and cleaned with ultrasonic waves; Plastic parts can be rinsed with water. Dry before reassembling.

2. Testing electrical performance

Professional technicians use a multimeter to measure the voltage and current values of key circuit nodes, and determine whether there are problems such as short circuits or open circuits.

Check if the sensor signal output is normal and calibrate the analog signal input-output curve.

3. Upgrade firmware version

Pay attention to the latest software updates released by the manufacturer and follow the instructions in the documentation to complete the firmware upgrade operation for better stability and support for new features.

4. Overall performance testing

After completing all the maintenance steps mentioned above, conduct comprehensive functional testing, including blank running, standard sample analysis, and actual sample testing, to ensure that all indicators meet the factory specifications.