How to select the range of an instrument based on operating parameters such as pressure and temperature
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How to select the range of an instrument based on operating parameters such as pressure and temperature
What type of instrument? The selection methods for temperature, pressure, level, and flow rate each have their own characteristics. Moreover, the material for the contact sensor section must be selected based on the physical and chemical properties of the medium. You’re being too general.
You need to make it clear which type of gauge you are choosing. When making a selection, factors such as temperature and pressure are important, but so are the process medium, process pipelines, site conditions, accuracy requirements, and more. Only by providing these details can we give you an accurate answer to your questions!
In my opinion, it is better to choose the process parameters within the range of 30% to 80% of the instrument’s range.....
The pressure parameter should be set to a range that is 1.5 to 2 times the normal operating value； The temperature parameter should have its range set at 1.1 times the normal operating value.
What regulations determine the range selection? Thank you for your reply
It is recommended to carry out some additional work to find out the maximum pressure of the pressure-driven equipment; for example, if it is a compressor or pump, find out what the maximum pressure in the process will be. As for temperature, check the heat exchange medium or heating equipment used upstream – this parameter should be confirmed as part of the process setup.
The maximum process pressure and normal pressure are provided to the instrument; how does the instrument determine the range?
The process parameters are determined based on the process requirements, and then these parameters are communicated to the instrumentation team. (The range in question is determined as follows: for level measurement, it depends on the size of the equipment used in the process; for flow measurement, it depends on the amount of fluid used in the process.) The instrumentation team then selects the option with the best cost-performance ratio, taking into account all the parameters provided by the process.
What needs to be considered for instruments is their proper operation and service life under various operating conditions.