Air Flow Monitor

Continuous emission monitoring (CEM) is essential for maintaining air quality and adhering to environmental regulations. For over 45 years, Acoem DynOptic has been at the forefront of designing and manufacturing high-technology instruments for monitoring opacity, dust, particulate and smoke emissions. Their dedication to innovation and excellence makes them a trusted name in environmental monitoring.

CROSSFLOW is a cross bore air flow monitor designed to measure air speed and direction in multi-lane and bi-directional tunnels. The monitor consists of a pair of transceivers which are mounted and aligned on either side of the bore. The transceivers both emit ultrasonic pulses and measure the sound waves time in flight in each direction. The difference between these flight times is used to determine the flow of air within the tunnel. This can then be used as part of the tunnel's ventilation and energy management system.

CROSSFLOW is a self-contained intelligent analyser with on-board industry standard SCADA (Supervisory Control and Data Acquisition) / PLC (Programmable Logic Controller) interface options, such as 0/2/4-20 mA outputs, alarm relay contacts and a choice of serial communications protocols. As such the CROSSFLOW has no need for a separate control unit although one is available as an option. As a standalone instrument, the CROSSFLOW can be set-up and controlled using the utility software supplied, installed on a PC or laptop and connected via the USB connector.

The AIRFLOW tunnel monitor uses proven ultrasonic transit time technology to deliver a reliable measurement of air speed and direction in tunnels. It is a dual axis monitor that can measure air speeds of up to 60m/s with a resolution of 0.01m/s.

Having been designed specifically for tunnel environment, the AIRFLOW monitor is of rugged construction using powder coated stainless steel and UL (Underwriters Laboratories) rated flame retardant polycarbonate (PC) to achieve an IP67 / NEMA (National Electrical Manufacturers Association) 6P protection rating. This instrument can withstand corrosive atmosphere and regular tunnel washing that the tunnel environment endures.