What is the calculation formula for level measurement using double flange transmitters?

It is recommended to look at textbooks. The prerequisite for using double flanges is that the medium level must be above the upper flange opening. The boundary position only changes between the upper and lower flange openings.

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When measuring the interface with double flanges, it is necessary to ensure that the medium level is above the upper flange opening. The grade only changes between the upper and lower flanges. The lower measurement limit (zero point) of the transmitter used for measuring the interface with dual flanges is the density of the light component multiplied by the distance between the upper and lower flanges (at this point the interface is at its lowest level, with the medium between the two flanges being the light component) ； The upper measurement limit (full scale) of the transmitter used for measuring the interface with dual flanges is the density of the heavy component multiplied by the distance between the upper and lower flanges (at this point the interface is at its highest position, with the medium between the flanges being the heavy component) ； The range of the transmitter for measuring the interface with dual flanges is: upper measurement limit – lower measurement limit. After calibrating the transmitter according to the range, the migration function can be used to set the transmitter’s input at the lower measurement limit so that the output corresponds to the signal zero point.

This post was last edited by Junhui81 on 2019-6-28 at 18:21. There are three installation methods; for the calculation method, see http://www.tx7878.cn/hynews/1985.htm. Formulas for calculating the range of liquid (interface) level in double-flange differential pressure transmitters: 1. For liquid level: Zero point = ρ_silicone oil × gh_liquid; Range = ρ_silicone oil × gh_liquid – ρ_liquid × gh_liquid. 2. For interface level: Zero point = ρ_silicone oil × gh_liquid – ρ_light_medium × gh_liquid; Range = ρ_silicone oil × gh_liquid – ρ_heavy_medium × gh_liquid. The symbols in these formulas mean as follows: ρ_silicone oil – density of silicone oil; h_liquid – height at which the liquid level is measured; ρ_light_medium – density of the light medium; ρ_heavy_medium – density of the heavy medium. This calculation formula is particularly dependent on the installation position of the capillary tube; if the transmitter is installed below the lower pressure tapping point…

With today’s smart differential pressure transmitters, once they are installed, it’s sufficient to simply reset them; there’s no need for any further calculations

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