Submersible Air Flow Transmitter

Designed for monitoring the air flow rate in the drop pipes to diffused aeration systems, the Snorkel can eliminate inaccurate readings caused by flow measurements made without adequate lengths of straight pipe. Double sealed and potted, the probe can be installed up to 25 ft. below the water surface in a ½ in. NPT tap. The transmitter's thermal dispersion technology measures SCFM without requiring external pressure or temperature sensors. The NEMA 4X transmitter is 120 VAC or 24 VDC powered and includes an LCD display and a 4-20 mA output signal.

The sketch shows a typical arrangement where air is blown into the bottom of a basin full of liquid through diffusers or spargers. The primary market for this device is in wastewater treatment, but it could be used for any process where air is used for agitation or oxidation.

In order to measure flow in a pipe accurately it is necessary to have 15 diameters of straight pipe to establish a uniform velocity profile across the pipe. In many retrofit applications of automatic controls to existing facilities the air piping does not have a sufficient length of straight piping available above the liquid surface. In order to surmount this difficulty, the company designed the Snorkel to be submerged and take advantage of the straight pipe below the liquid surface. This achieves accurate air flow measurement without extensive modifications to the piping.

ESCOR - Energy Strategies Corp., 4919 W. Good Hope Road, Milwaukee, WI 53223. Tel: 920-228-1398; Fax: 920-228-9849.