time, unexpected maintenance costs, and even damage to your team’s credibility as analytical instrumentation professionals. Your sampling system design or routine operations and maintenance training and procedures may be the culprit – and it’s harming your operation more than you think.
3) Your liquid sampling pressure is too low. Liquid samples are just the opposite. Letting the pressure drop may release a dissolved gas, thus causing the liquid to bubble or foam. It’s best to keep the pressure of a liquid sample as high as possible.
4) You haven’t paid much attention to the surfaces your sampling system needs. When sample fluid touches a surface, a few molecules stick. Loss of molecules due to adsorption can spoil your sample. Pick the proper materials for filter elements, regulator diaphragms, tube walls, or gas cylinders when designing or maintaining your system.
5) You’re using elastomer seals not compatible with your sample fluid. Material that is mismatched to your sample fluid may cause a failure like sample leakage or even a blockage within the sampling device leading to the degraded accuracy of your analysis.
6) You’re sampling from a stagnant line. For a representative sample, make sure you’re sampling from an active process line. Remember that the timeliness of your sample is also dependent on the time it takes the sample to flow from the process to the extraction point. The location of the sample point can be a critical aspect of a successful sampling system.
7) You’re not spot ting dead legs in your sample-transport line. Dead legs or unpurged volume allow molecules to diffuse into the sample causing a slow analyzer response and continuous contamination of your system.
8) Your vaporizer is too hot. A hot vaporizer body could boil the incoming sample, causing it to fractionate. Make sure you understand temperature requirements of the chemicals in your system and appropriate equipment settings to prevent errors
9) Your sample flow is too slow. The slower your sample flow, the more viscous drag is placed on the interior wall of your tubing, causing solids to form. A faster flow is recommended for good sample mixing, cleaner sample lines and faster response time
10) You’re not looking for the causes of time delay in your sampling system. If your measurement does not follow your process, you have time delay in your system. Other symptoms are blurred or muted response, laboratory disagreement, and poor performance of a control scheme