The positions of the installed differential pressure transmitter (DPT) and the line pressure transmitter (LPT) on the venturi meter are shown in Fig. 2. The DPT was used to measure pressure drop, ΔP, between inlet and throat of the venturi meter. The LPT was used for gage line pressure measurement at inlet of the venturi meter. The impulse lines (small-bore pipe) are connected to the points at the inlet and throat of the venturi meter to the differential pressure transmitter's ports for measurement of the venturi pressure drop.
The physical properties of mineral oil D80 used in the experimental work are presented in Table 3 (www.exxonmobilchemical.com, 2014). The oil Exxsol D80 was procured from ExxonMobil Company. It is a dearomatized fluid with low odor, low levels of toxicity, broad evaporation range and narrow boiling range.