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One rule
When the system fails, you can tentatively change some states and change one parameter at a time. Do some simple changes and maybe solve the problem.
2. Second comparison rule
The fault has been identified before the hands-on maintenance, or the solution to the fault has been determined. In other words, you have already found it before you start.
The right solution. For example, during the injection process, the peak value of the internal standard is found to be low, and the injection can be repeated to see how reproducible, if it is
However, it is low, whether it is a bubble in the quantitative tube. This rule can be used to examine the situation after a system change. Replaced the flow backwards in the formal injection
Two standards can be used before to check the stability of the retention time and the stability of the chromatographic peak. If there are extra peaks in the gradient elution,
It can be eluted once with a no-load gradient (is there really a problem?), using this rule to avoid unnecessary changes and to determine corrective actions as soon as possible.
3. Replacement rules
Replacing suspicious parts with good parts is the best way to find faults. If you suspect that the detector is causing noise, change performance.
Good rotorless vulcanizer detector. If the fault is eliminated, there is a problem with the replaced detector. The scale of this rule application is quite large.
Small, you can change from the entire part to the integrated block on the printed circuit board.
4. Change back to the rules
This rule is used together with the replacement rule. After the good part replaces the suspicious part of the solution flow rate meter, the situation has not been improved.
Replace the original part. This minimizes maintenance costs and prevents the use of used components to build down the rotorless vulcanizer. This rule only applies
For a single failure. The principle of exchange back does not apply to the following situations:
(1) New parts are damaged when removed (eg pump gasket);
(2) The price of the parts is low (such as the column lining filter);
(3) The risk of damage if the original parts are reinstalled;
(4) Parts that are replaced regularly.
5. Reference condition rules
There are usually two reference conditions: 1 standard reference condition; 2 test reference condition.
Standard reference conditions, also called standard test conditions, are easy from one system to another, from one laboratory to another.
The conditions for verification. The data measured with this condition helps to identify problems between actual tests and systems. If the system pressure is under certain test conditions
Elevated, and the pressure is normal under standard conditions. This indicates that the abnormality of the solution flow rate meter system is caused by changes in the laboratory.
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