Environmental conditions of sampling measurement
Scene sampling is to determine the calibration interval between the commonly used method fixed installation of instrument measurement accuracy.However, it is important to understand that sampling observation is different from the scene calibration.In this blog, we will briefly introduce some of these differences.Sampling and in-situ calibration of similar in that they both use reference standard measurement results to verify the device under test.
Sampling is a more time-saving than calibration process, partly because of the calibration process may include the same data, adjust (if necessary) and adjusted data, and sampling inspection is to verify that instrument measuring accuracy is still to be tested within the scope of the specification.Please keep in mind that the calibration process is involved in the instrument, rather than its measurement results.Field calibration procedure should be used under the condition of normal flow standard laboratory determination of concentration of sample.
As with calibration, the quality of your guidelines should also specifies the sampling interval.Should use predetermined limit to define the corresponding guiding principle, to determine the possible action according to the results of the inspection.
Sampling can also be a part of the validation process, because it can make sure that the process on the sensor measurement result conforms to the specification.In simple terms, at the scene of the sampling inspection, verification and calibration, you are in the comparative measurement results.Ideally, according to the calibration of equipment state, you used to check the equipment should be known accurately.However, calibration, validation, and there are also differences in sampling, the most important thing is that in the calibration, you may need to make a decision according to the comparison results and adjust.
During the verification (also known as sampling)
According to your quality guidelines for sampling device may need to verify in order to ensure the confidence of the measurement result.During the verification is performed during instrument in the calibration interval quality assessment on a regular basis, to ensure its still meet the specification requirements.As long as in a given time period or in a given scenario (e.g., on-site sampling) observed within the acceptable limits, or drift error checking equipment is in good condition.
Check "sampling" during the period of the simple form is validated, the comparison of measuring the parameters of the same two sensors.You are using a sensor as a reference standard, the other is a sensor unit under test (UUT), differences in measurement results to check.There is no need to perform a complete measurement range checking or calculate the uncertainty of measurement, but the process should be implemented procedural (that is to say, to perform as planned, and using the defined instrument, etc.) and documented.
During the inspection guide
According to ISO 17025:2017 during execution for verification:
6.4.2: when laboratory used in the permanent control beyond the range of the device, should ensure that meet the requirements of this document on the equipment.
During the 6.4.10: when you need to perform inspections to maintain confidence in the performance of the equipment, these checks should be undertaken according to relevant procedures.To ensure the validity of the results - 7.7.1: laboratory shall formulate monitoring results on the effectiveness of the program.Should plan and review the monitoring and discretionary including (but not limited to) : (e). During the verification of measuring equipment;
According to ISO 9001:2015 during verification to monitoring and measurement source ":
7.1.5.1 routine
The organization shall guarantee provided by the resources:
B) to maintain proper, in order to ensure resources are always suitable for the purpose of the organization.
The organization shall keep proper document information, as evidence of monitoring and measuring resource applicability.
conclusion
In essence, during the inspection, sampling and validation on the function are the same thing.That is to say: they are used to implement security sensors installed in the accuracy of the calibration interval between twice this goal.Whether you use sampling inspection or during the verification, the key is to choose to suit your business and organizational terms, and guarantee in quality and program files you use these terms in a consistent manner.Consistency is good documentation practices (GDocP), as part of the industry expects of document creation, maintenance and development work.Any industry to observe the GxP need attaches great importance to the method and the consistency of a term used in the document.
