Agilent headspace samplerIt is an efficient and intelligent sample pretreatment equipment in gas chromatography analysis, with core advantages reflected in automation, high-throughput, inert flow path design, and multi domain compatibility.

Agilent headspace samplerCommon faults and solutions in use:

1. Poor reproducibility of sample peak area

Possible reasons:

Poor sealing of the sample bottle.

Unreasonable setting of equilibrium temperature or equilibrium time results in incomplete or inconsistent sample evaporation.

The injection needle is blocked or contaminated, which affects the sampling volume.

The flow rate of the carrier gas is unstable.

resolvent:

Check the sealing of the sample bottle, replace the spacer and bottle cap with new ones, and ensure consistent tightening force.

Optimize the balance temperature and time.

Clean the injection needle with a suitable solvent and replace it if necessary.

Check the pressure of the carrier gas source, calibrate the flow meter, and ensure stable flow rate.

2. No sample peak or peak area too small

Possible reasons:

The injection needle is not inserted into the sample bottle or the injection position is incorrect.

Insufficient sample volume or no sample added to the headspace bottle.

Heating module malfunction, sample not fully evaporated (such as heating temperature not reaching the set value).

The injection valve did not switch properly, and the sample did not enter the chromatography system.

resolvent:

Check the position of the injection needle, recalibrate the height and insertion depth of the injection needle.

Confirm that the sample has been correctly added to the headspace vial and the volume meets the method requirements.

Check the temperature display of the heating module, calibrate the actual temperature with a thermometer, and if there is any abnormality, contact maintenance personnel to repair the heating element.

Check the control circuit and solenoid valve of the injection valve to ensure normal valve switching.

4. Instrument alarm

Possible reasons:

The temperature sensor is malfunctioning, resulting in abnormal temperature display.

Heating wire short circuit or open circuit, unable to heat properly.

The carrier gas pressure is lower than the set value.

resolvent:

Check the temperature sensor connection, clean the sensor probe, and replace the sensor if it still alarms.

After power off, check the resistance of the heating wire to confirm if it is damaged, and replace the heating component if necessary.

Replace the carrier gas cylinder and check if the pressure reducing valve is working properly to ensure stable input pressure.

5. Injection needle blockage or jamming

Possible reasons:

There are particles or high boiling impurities in the sample that deposit inside the needle.

Long term disuse leads to the solidification of residual substances inside the needle.

resolvent:

Rinse the injection needle repeatedly with a suitable solvent and use a fine steel wire needle if necessary.

When not in use for a long time, soak the injection needle in a solvent or perform regular maintenance cleaning.