Measure flow rate accurately

At the core of all PULSE ultrasonic chemical injection metering valves (CIMVs) is a nonintrusive, line-of-sight ultrasonic flowmeter that reliably measures chemical inhibitor flow rate without the need for subsea filtration. An ultrasonic transducer is positioned at each end of the metering path. The two transducers emit ultrasonic pulses that travel through the fluid, with and against the direction of chemical flow, respectively. The difference in time of flight in the two directions is accurately measured by the onboard ultrasonic control module and used to calculate the flow rate of the injected chemical.

The flowmeter is particulate-tolerant and pressure-independent, with no moving parts, very low native pressure drop, and extremely high turndown ratio. Its accuracy is better than ±3% of the reading, compared with 5% to 10% of full scale for the industry standard Venturi type flowmeter.

Maintain injection set point indefinitely

Within the CIMV, the proprietary ultrasonic flowmeter is combined with an electrically actuated throttling valve in closed-loop control. Real-time feedback from the flowmeter is used to autonomously control the valve. A user-defined injection rate can be maintained indefinitely, regardless of system disturbances.

Stream data in real time

Flow rate monitoring and valve actuation using the onboard closed-loop control algorithm, as well as external communications, are managed by the electronic control module, which streams operational performance data to the operator via the master control station.


  • Nonintrusive, particulate-tolerant flowmeter with no moving parts; flow rate measurement based on speed of ultrasonic waves travelling through the chemical
  • Extremely high turndown ratio (up to 2,400:1 for the PULSE LF low-flow ultrasonic CIMV)
  • Accuracy better than ±2% of reading for all flow rates greater than 2 L/h for PULSE LF CIMV;
    better than 3% of reading for PULSE MF medium-flow and PULSE HF high-flow ultrasonic CIMVs
  • Low native pressure drop, less than 100 psi [6.9 bar]
  • Maximum working pressure 15,000 psi [1,034 bar]; higher pressures possible