The gas phase autosampler cannot be ignited, you can check and eliminate it by following the steps below.
In order to improve the accuracy of the analysis and the life of the syringe, many experimenters will choose to wash the needle after the injection. Moreover, the corresponding gas washing program is set on the gas phase autosampler to facilitate the user to wash the needle with one button.
Why should the gas phase autosampler wash the needle?
First, the needle can be washed to avoid clogging of the needle. For some samples with high viscosity, if not cleaned, it will easily adhere to the syringe after injection, causing the needle to clog and affect the next injection. While doing sample filtration work, wash the needle in time to avoid clogging of the syringe.
Secondly, washing the needle can avoid injection residue. Residues between different samples can cause some degree of interference in the analysis results. If the sample remains on the syringe with the last sample, it will affect the analysis results. Therefore, in order to avoid injection residue, the syringe should be cleaned with different solvents.
In addition, washing the needle does not affect the injection volume. The gas phase autosampler wash needle is washed in the sample bottle after the sample is finished, mainly to dissolve the sample remaining on the outer wall of the needle tip, and does not affect the injection amount.
The gas phase autosampler cannot ignite the fault. Check the exclusion according to the following steps:
(1) Inspection of the ignition wire
The ignition wire should show a bright yellow-red color. If the ignition wire can be lit, it indicates that the ignition circuit is basically normal. If the point does not react at all, it indicates that there is a problem with the ignition circuit. At this time, it should be transferred to (7) for further inspection.
(2) Airflow ratio check in the airway
During normal ignition, the hydrogen flow rate should be increased, and the air flow rate should be appropriately reduced. The carrier gas or the makeup gas should be adjusted to be small or closed. If the flow rate is not correct, it should be adjusted.
(3) Hydrogen gas leak check
After the power failure, close all flow control valves except oxygen, block the hydrogen flame ion chamber nozzle with a silicone rubber pad or a clean soft rubber head, and apply a little downward force to block the hydrogen flowing out of the nozzle. The rotor in one of the rotameters should slowly drop to zero. If the rotor does not fall or falls but falls below zero, it means that there is a leak in the hydrogen gas, and it is treated as (4); if the rotor can be reduced to zero, it is transferred to (5) for processing.
(4) Eliminate air leaks
Test leaks, find out the leak point, and if necessary, handle the leak test on the gas pipeline. After the leak is found, it should be handled according to the specific circumstances. For details, see the inspection and elimination of the leak. One thing to be aware of when eliminating hydrogen gas leakage faults is that the leakage downstream of the carrier gas path will also cause the hydrogen gas path rotor to fall below zero. This is because the carrier gas and hydrogen gas are connected to each other in front of the nozzle. reason.
(5) There is a blockage in the gas path
Blockage of the gas path, especially the blockage of the gas path at the nozzle, is a common cause of failure to ignite or extinguish after ignition. Excluding the clogging method can be found in the cleaning section of the pneumatic component.
(6) Adjustment of gas path ratio
Failure to ignite or to ignite is often related to the ratio of the flow paths in the ignition state. The hydrogen flow rate should be increased several times in the ignition state, and the air can be slightly reduced. The nitrogen used as the carrier gas should be reduced or even turned off, and then slowly increased after ignition. This adjustment can be repeated several times until it is ready to catch fire.
(7) Ignition component contact goodness check
(8) ignition circuit output voltage check
If the output voltage of the ignition power supply is directly measured, it is known whether the ignition power supply is faulty.
(9) Connection and plug have open circuit
(10) Poor contact of the detector
The above is about the gas phase autosampler can not ignite today, you can share the following steps to check and exclude, I hope that you can use this device in the future.
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