Note the special transmitter manifolds, built to accept both the differential pressure and absolute
pressure (Rosemount model 3051) transmitters. Also note the quick-change fittings (the ribbed castiron
housings) holding the orifice plates, to facilitate convenient change-out of the orifice plates which
is periodically necessary due to wear. It is not unheard of to replace orifice plates on a daily basis
in some industries to ensure the sharp orifice edges necessary for accurate measurement