Double-flange level gauge

Since it is a double-flange design, the working pressure inside the container acting on the upper diaphragm box and the lower diaphragm box can cancel each other out. The differential pressure ΔP = (P+) – (P-). The migration amount P = ρ of silicone oil × gh. Simply put, the differential pressure value obtained when the tank is empty can be used as the zero point (for example, if the ΔP for an empty tank is -10 KPA and the measurement range is 20 KPA, then setting the instrument between -10 KPA and 10 KPA will suffice). In the case of a single-flange level gauge, however, the operating pressure inside the container must be taken into consideration. Single-flange level gauges are generally used to measure the liquid level in containers, with a pressure transmitter located at the top of the container to facilitate pressure correction. (The principle is the same as that of a double-flange level gauge; the systematic error is greater than that of a double-flange level gauge.) It is recommended to purchase the \"Instrumentation Technician Exam Questions\" book, the section on field instruments, and take a look.

Measuring the liquid level is unrelated to pressure. But you need to consider the installation, as well as the pressure that the gauge as a whole can withstand; it must be greater than the operating pressure inside the tank, otherwise, you know what will happen

It is related; it’s the surface pressure plus the pressure inside the container. Although the pressure inside the container seems unnecessary, this process is essential.

Yes, for double-flange types, whether measuring sealed or open systems, it has nothing to do with the ring gauge pressure; of course, the sealing capacity and pressure resistance need to be selected appropriately

A double-flange level gauge has nothing to do with the pressure inside the container; it is only related to the liquid level height within the container.

The double-flange level gauge has no relation to the pressure inside the container; the differential pressure transmitter generates a differential pressure based solely on the liquid level in the container, thereby indicating the corresponding level.

Since it is a double-flange level gauge, it is used in sealed, pressurized containers. The reason for using a double-flange rather than a single-flange level gauge is that the pressure inside such sealed, pressurized containers changes; the upper and lower diaphragms of the double-flange level gauge help to counteract these changes in gas pressure. As a result, the measurement value provided by a double-flange level gauge is independent of the gas pressure. This can be understood by examining the calculation formula for differential pressure level gauges!

The liquid level measurement range is independent of pressure. The operating pressure of the instrument is related to the pressure inside the container; refer to the instrument’s user manual for details ；