Double-flange level gauge
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Due to the high viscosity of the material, its tendency to crystallize, and the significant corrosive effects, a double-flange level gauge is selected. To prevent corrosion, an anti-corrosion layer is added on top of the film; I wonder what impact this has on precision? By the way, negative pressure is sometimes applied during operation; normally, it is at atmospheric pressure.
First of all, may I ask what material your anti-corrosion layer is made of, whether it can transmit pressure, and if there is any lag, etc. To prevent corrosion in double flanges, it is possible to apply a layer of plastic film over the diaphragm. It has little impact on accuracy. There are no issues with normal use. If negative pressure is used during the operation you mentioned, then a double-flange level gauge cannot be used. Otherwise, it will damage the gauge diaphragm.
Media with high viscosity and tendency to crystallize seem not to be very suitable for double-flange level gauges. The measurement accuracy may not be guaranteed. Perhaps using an insert-type double flange in combination with the equipment interface could also work.
Diaphragm box with anti-corrosion layer? Was it added by the manufacturer, or did you modify it yourselves? In fact, using a corrosion-resistant diaphragm should suffice; when making the selection, negative pressure should be taken into account.
Also want to know the result, studying*. . . . . What brand of transmitter did the original poster choose? Would it be better to use a radar level gauge? ?
Would a radar level gauge be more suitable?
Radar level gauges are selected; for applications with negative pressure and materials with high viscosity that tend to crystallize, double-flange level gauges are not suitable.
An insert-type double-flange level gauge might be better