Basic rules for instrument maintenance - Database & Sql Blog Articles

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First, change the rules When the system fails, you can tentatively change some states, one parameter can be changed at a time. For example, to limit the problem of spectral peak de-dimensionality, the mobile phase can be changed sequentially, the guard column can be changed, and the analytical column can be changed. Do some simple changes and maybe solve the problem.

Second, replace the rules with good parts to replace suspicious parts, is the best way to find faults. If you suspect that the detector is causing noise, switch to a good performance detector. If the fault is eliminated, there is a problem with the replaced detector. The scale of this rule application is large and small, from changing the entire part to replacing the integrated blocks on the printed circuit board.

Third, the second comparison rule has identified the fault before the hands-on maintenance, or has determined the solution to solve the fault. In other words, the solution has been found before the hands-on. For example, during the injection process, the peak value of the internal standard is found to be low, and the repeating injection can be repeated to see how reproducible, if it is accidentally low, whether the bubble is in the quantitative tube. This rule can be used to examine the situation after a system change. After changing the flow backwards, the standard can be fed twice before the formal injection to check the stability of the retention time and the stability of the chromatographic peak. If there are extra peaks in the gradient elution, you can elute once with the no-load gradient (is there really a problem?), use this rule to avoid unnecessary changes and determine corrective actions as soon as possible.

Fourth, the reference condition rules usually have two reference conditions: 1, standard reference conditions; 2, test reference conditions. Standard reference conditions, also known as standard test conditions, are conditions that are easily verifiable from one system to another, from one laboratory to another. The data measured with this condition helps identify problems between actual tests and systems. If the system pressure rises under certain test conditions, the pressure is normal under standard conditions. This indicates that system anomalies are caused by changes in the laboratory.

V. Exchange of rules This rule is used together with the replacement rule. After the good parts have replaced the suspicious parts, the situation has not been improved and the original parts should be replaced. This has the least cost of repairs and prevents the backlog of used parts. This rule only applies to a single fault. The exchange-return principle does not apply to the following situations: 1. The new parts are damaged when removed (such as the pump gasket); 2. The parts are low in price (such as the column lining filter); 3. Reinstall the original parts to cause damage. Risk; 4, regular replacement parts.