Question 557General Subjects - Assistant Engineer

The correct answer is D) Isolation of corrosive products from the measuring element. A mechanical pressure seal is used to isolate the pressure measuring instrument from the process fluid, particularly when the fluid is corrosive. This protects the sensitive components of the instrument from being damaged or compromised by the corrosive properties of the fluid. The other options, such as isolation from high temperatures or high pressures, may require different types of protection, but a mechanical pressure seal is specifically designed to guard against corrosion. The other answer choices are incorrect because they do not directly address the need to protect the instrument from corrosive fluids, which is the primary function of a mechanical pressure seal in this application.