Insight Engineering performed CFD simulations (Computational fluid dynamics) and field-tested pressure transmitters from different suppliers to ensure that the high requirements were fulfilled. The pressure transmitters were examined after the extensive field tests to evaluate damage and changes in measurement accuracy. After the examination the final choice was a flush membrane pressure transmitter model FPT from Regal Components.
FPT is a very robust front membrane pressure transmitter with a thin-film-on-steel sensor and duplex stainless steel 1.4462 front membrane. Many other front membrane pressure transmitters have piezoresistive sensors, these pressure transmitters have a liquid ex. Silicon oil in between the front membrane and the sensor acting as a transmission media. This makes them sensitive to blows on the front membrane. FPT with it’s thin-film-on-steel sensor is directly connected to the frontal membrane without transmission media, hence it has solid material behind the membrane. This design also allows a thicker frontal membrane which makes FPT a very robust pressure transmitter well suited for this application with contaminated fertilizer and corrosive and chemical environments.
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