“…Single sensing device is often use in measuring a parameter of flow such as velocity, phase volume fraction, pressure gradient, flow pattern identification and characterisation (Shamsul et al, 2015). For example, sensors frequently used in measuring oil-water flow include pressure transducers (Da et al, 2007;Flores et al, 1998;Shamsul et al, 2015), ultrasonic sensors (Dong et al, 2015;Kouame et al, 2003;Morriss and Hill, 1991;Tan et al, 2016), gamma densitometer (Descamps et al, 2006;Kumara et al, 2010a;Tesi, 2011), conductance probes (Chen et al, 2015;Du et al, 2012;Jana et al, 2006;Oddie, 1992;Shamsul et al, 2015) capacitance probes (Ismail et al, 2005) and electromagnetic flowmeters (Faraj et al, 2015;Jin et al, 2020).…”