It is a detailed drawing showing typical installation of an instrument in a correct manner so that the instrument operates properly and prevent issues which could potentially affect the measurement such as liquid trap in gas impulse.

What is a work drawing?

: a scale drawing of an object to be made or structure to be built intended for direct use by the workman — compare detail drawing.

What is Section drawing?

A section drawing, section or sectional drawing shows a view of a structure as though it had been sliced in half or cut along another imaginary plane. Plan drawings are in fact a type of section, but they cut through the building on a horizontal rather than vertical plane.