Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Accounting for the tube expansion
Using steel tube in place of glass tube
Filling nitrogen under pressure in the stem
Increasing the diameter of the tube

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Process Control and Instrumentation
A magnetic flowmeter is

All of these
Capable of measuring the flow rate of slurries and electrolytes
Based on the principle of Faraday's law
Based on the linear relationship between the fluid flow rate and the induced voltage

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