Differential pressure is the difference between the inlet and outlet pressure of the trap.

1 bar = 14.50377 lbf /in2 =Psi

1Mpa = 10.197 kg/Cm2 = 10 bar  = 145.0377 Psi

1 lb/h(m3 /s) at 15.5 C° = 0.45359237 kg /h at 15.5 C°