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

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

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Process Control and Instrumentation
A magnetic flowmeter is

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

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