A debris-tolerant, microbore, nonintrusive, line-of-sight ultrasonic flowmeter with no moving components is used in the PULSE LF CIMV. It is pressure independent and has a very low native pressure drop, unlike a Venturi type flowmeter. The flowmeter has a very high turndown ratio and stable accuracy (better than 2%). (up to 2,400:1).The flow of the chemical through the system is controlled by a precise needle valve. The needle features an equal % flow curve, which allows for superior control across a wide flow range. It is regulated by the feedback from the ultrasonic flowmeter via the onboard closed-loop control algorithm and is actuated by an electric actuator that offers extremely precise system adjustment.