Does a simple analyzer necessarily require the sample to be brought out for measurement?
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As the title suggests, for simple analyzers such as those for conductivity and pH, can they be directly inserted into the process pipeline for measurement? Generally, how is it determined whether to use a bypass tank for measurement? Are there specific temperature and pressure limits?
It’s best to look for answers to such questions in the chemical analysis section.
SHT 3174-2013 Specifications for the design of on-line analytical instrument systems in the petrochemical industry
Consider the process conditions and the selection of analytical instrument probes. Generally, the temperature is not high. Media with low pressure can be measured by insertion ； If the temperature and pressure of the medium are relatively high, making it difficult to select an appropriate probe or resulting in high costs, a flow cell can be used to reduce the temperature and pressure ； The specific limit values are determined by the choice of analyzer probe; generally, providing the relevant parameters during the inquiry allows the analyzer manufacturer to select them. The advantages and disadvantages of plug-in measurement are quite obvious; the advantage is almost no measurement delay, with fast data acquisition ； The disadvantage is that it is limited by the properties of the process medium, and maintenance is inconvenient; it is not easy to insert or remove components for repair or replacement. The PH electrode you mentioned, for example, requires periodic cleaning and calibration, and frequent insertion and removal can disrupt continuous production (of course, this is different in cases where production is intermittent). The advantages and disadvantages of induced measurement are as follows: the advantage is that it allows for temperature and pressure reduction, with few restrictions on the temperature and pressure of the process medium, and the options available are also simpler ； The disadvantage is that the temperature and pressure reduction during introduction requires consideration of the properties of the process medium, as its release can affect the accuracy of measurements, and there is also a measurement lag.
Support the view above; based on the actual situation