Unit-Kinetics-Celerity URS 40August 24, 2012|Mass Flow Controllers, Unit-Kinetics-Celerity Home » Mass Flow Controllers » Unit-Kinetics-Celerity » Unit-Kinetics-Celerity URS 40 Coastal Instruments services many of Unit-Kinetics-Celerity mass flow controller models. The Unit-Kinetics-Celerity URS 40 is one of the models we service.