Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-07-26
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Process Engineering Section – Instrumentation and Automation Section – Daily Question – Question from 2020-07-26: Discussion question: 187. Why is silicone oil generally used as the filling fluid in the capillaries of flange level gauges and in the diaphragm boxes of differential pressure transmitters?
Good thermal conductivity, insulating properties, and stable performance!
It has stable chemical properties, is non-toxic and non-corrosive, has a low coefficient of thermal expansion, and a moderate density.
It has stable chemical properties, is non-toxic and non-corrosive, has a low coefficient of thermal expansion, and a moderate density.
Inert oils generally do not react with the medium, have low compressibility, and are little affected by changes in temperature and pressure. However, fluorine oil is used in applications where the liquid medium contains wet chlorine gas.
Silicone oil has a high boiling point, a low coefficient of expansion, a low freezing point, and low chemical reactivity; therefore, changes in ambient temperature do not affect the measurement values
Due to the high boiling point, low coefficient of expansion, low freezing point, and low chemical reactivity of silicone oil, changes in ambient temperature do not affect the measurement accuracy.
It has good thermal conductivity. Insulation is fine. Stable performance.
It has stable chemical properties, is non-toxic and non-corrosive, has a low coefficient of thermal expansion, and a moderate density.
It generally reacts with other media and has good thermal conductivity.
It has stable chemical properties, is non-toxic and non-corrosive, has a low coefficient of thermal expansion, and a moderate density.