The accuracy of all measuring devices such as analyzers can degrade over time. This is often a result of normal wear and tear, degradation of components or contamination. Changes in the analytical response can also be caused by electric or mechanical shock, changes in sample system performance, or variations in other sensors such as pressure, temperature, or flow measurement devices. To demonstrate the continued reliability of a process or laboratory analyzer, it is recommended that the device be validated against some form of reference or standard.

For many analyzers, the validation is performed by running a calibration standard in which the concentration or property of interest has been independently determined.........

Many sampling systems, whether for grab sampling, composite sampling, or online analytical systems suffer from response time issues and not having representative samples present at sampling points. Often these issues can be resolved if a fast loop were present, but these may not be considered if a low pressure return point is not available or if the maintenance of a pump is to be avoided. These issues may be overcome with a properly installed probe that utilizes the internal energy of the process flow to drive the fast loop.

A uniquely designed sample probe, capable of driving a full pressure fast loop with process return has been developed. The use of such probes allows fast loop operations with a single point of entry, and can be used to return high pressure gases to process, and, for example, mitigate environmental emissions in natural gas pipeline applications........