Interface instrument for oil (ester) and water separation tank

The interface is not easy to test; both magnetostriction and electrofloatation methods are said to be possible, it just depends on whether they can be used effectively

For oil-water separation level measurement, dual flanges can be considered, which reduces maintenance needs

We use buoy types. Not very accurate

Differential pressure level transmitter a) Generally, differential pressure transmitters are used for level measurement. b) Flanged differential pressure transmitters should be used for corrosive media, viscous liquids, easily vaporizable liquids, and liquids containing suspended solids. c) For liquids that are easy to crystallize, have high viscosity, are gel-forming, or tend to precipitate, an insert-type flange differential pressure transmitter should be used. d) When condensate or precipitates form on the object being measured, a double-flange differential pressure transmitter should be used. e) When a differential pressure transmitter is used to measure the liquid level in the boiler drum, a temperature-compensated balance vessel should be employed. f) The differential pressure transmitter for measuring liquid level must be equipped with a drift mechanism, and its positive and negative drift amounts should be determined when selecting the instrument’s range. g) For liquids whose density changes significantly under normal operating conditions, differential pressure transmitters are not suitable. h) When a diaphragm-sealed differential pressure transmitter is used to measure liquid level, the lengths of the two capillaries should be equal.

Float-type level gauge: a) In applications where the density and operating pressure range are quite wide, a float-type level gauge is used for measuring the level (interface) of the fluid. Specifications for Instrument Selection and Design, Number: HENGLI-IN-SP-1010, Revision: 0, Page 17 of 30. WITHOUT WRITTEN PERMISSION FROM SEI, IT IS NOT ALLOWED TO COPY THIS DOCUMENT IN ANY WAY OR TO USE IT FOR PURPOSES OTHER THAN THOSE RELATED TO THIS PROJECT. DO NOT REPRODUCE OR EMPLOY FOR OTHER PURPOSES OTHER THAN THIS PROJECT WITHOUT WRITTEN CONSENT FROM SEI. 1) Measurement of liquid levels in liquids with a measurement range of up to 2000mm and a specific gravity of 0.5～1.5. 2) Measurement of liquid interfaces with a measurement range of up to 2000 mm and a specific density difference of 0.2 or more ； 3) Measurement of the level or interface of vacuum, negative pressure, or volatile liquids. b) For general applications, external floating-ball level gauges are recommended; a \"side-to-side\" flange connection type should be used, with flange dimensions of 2\" (DN50). The gauge face can rotate, and the center distance between flanges should be available in the series of 350 mm, 500 mm, 800 mm, 1100 mm, 1400 mm, 1700 mm, and 2000 mm, or as integer values with a step size of 100 mm. The float-type level switch is available in 350mm or 500mm versions. c) For viscous, prone-to-coagulation, and prone-to-crystallization media, an internal float type level gauge should be used. d) Internal floating ball level gauges are used in situations where the liquid being measured is highly agitated; an anti-disturbance sleeve should be installed. e) The float level gauge is equipped with radiators when the temperature of the medium being measured is above 200°C, and with extension tubes when the temperature is below 0°C. f) The external floating ball level gauge shall be equipped with a drain valve, and the size of the drain valve should be 1/2” (DN15).