What are the applications of well type manometer​

The well-type manometer is widely used because of having only one leg.  

Explanation:

The main difference between a U-tube manometer and a well-type manometer is that the U-tube is substituted by a large well such that the variation in the level in the well will be negligible and instead of measuring a differential height, a single height in the remaining column is measured.

Well-Type Manometer is used to gauge pressures at critical points in gas-train systems. ... Typical applications that the 97400 can be used in include anaerobic digester tanks/gas trains, boiler lines, engines, various plant utility lines and flares/waste gas burners.