Operating conditions for selecting double-flange differential pressure transmitters
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The double-flange differential pressure transmitter consists of the differential pressure transmitter body and a remote transmission flange equipped with a capillary, and is used to measure the level, density, pressure, and flow rate of liquids, gases, or vapors. Double-flange differential pressure transmitters have basically the same functions as conventional differential pressure transmitters, but there are differences in their selection: when it is necessary to isolate the pressure transmitter from the process medium, a double-flange differential pressure transmitter equipped with a remote transmission system should be chosen. A double-flange differential pressure transmitter is required when it is necessary to isolate the pressure transmitter from the process medium. Double-flange differential pressure transmitters should be used in the following five situations: ① When the temperature of the process medium exceeds the normal operating temperature range of the pressure transmitter, and it is not possible to reduce this temperature to within the transmitter’s normal operating range using pressure conduits. ②When the process medium is corrosive, it is necessary to replace the transmitter frequently or use special corrosion-resistant materials. ③When the process medium contains many solid particles, is very viscous, prone to crystallization, or has a freezing point at room temperature, making it impossible to draw it out using a pressure tap. ④When the food industry needs easy cleaning to prevent contamination between batches. ⑤In situations such as density or interface measurements, a double-flange differential pressure transmitter with a remote transmission system is required.
Your description is very accurate; dual-flange differential pressure transmitters have a wide range of applications and can be used in various special operating conditions. Double-flange differential pressure transmitters offer significant advantages, especially in complex situations where it is necessary to isolate the pressure transmitter from the process medium, or when the environment of the process medium is harsh. For example, it can effectively handle issues such as high temperatures, corrosive environments, high viscosity, or media containing solid particles. Furthermore, it is also suitable for use in the food industry, is easy to clean, and prevents cross-contamination. It can also provide accurate measurement results for applications that require density or interface measurements. .
To add further clarification: Double-flange differential pressure transmitters are mainly suitable for: (1) situations where it is necessary to isolate high-temperature media from the transmitter； (2) The measuring medium has a corrosive effect on the sensitive elements of the transmitter ； (3) The medium under test solidifies or crystallizes due to environmental or temperature changes ； (4) Strict purification of the measuring head is required when replacing the medium under test ； (5) Suspended liquids or high-viscosity media ； (6) The measuring head must be kept clean and hygienic ； (7) Measurement of sealed pressure vessels. Double-flange differential pressure transmitters are divided into 3 types: flush diaphragm, protruding diaphragm, and flush + protruding diaphragm. The protruding diaphragm is used for fouled or viscous media, with a protrusion length not exceeding 15 cm.