Air/Gas Flowmeter

May 5, 2005
ST50 flowmeters measure airflow from 1 to 125 SFPS, nitrogen from 1 to 150 SFPS, and compressed air from 4 to 400 SFPS with an accuracy of 2% of reading, 0.5% of full scale, with repeatability of 0.5% of reading, in lines sized from 2 to 12-in. diameter.

The insertion-type flowmeters use a fully temperature-compensated, thermal-flow sensing element made from precision, lithography-etched platinum RTDs embedded in patented equal-mass miniature diameter thermowells. The units come as a blind transmitter or with an LCD digital display, which can reside in the main transmitter or locate remotely up to 50 ft (15 m) away. Dual analog outputs, 4 to 20 mA and 0 to 10 Vdc, are field assignable as flow rate or temperature and a RS-232C I/O port. An optional 0 to 1-kHz pulse output totalizes flow. All configurations are field settable by laptop or PDA and a wireless IR link.

Sensing elements are made of stainless steel with Hast-C tips, and supporting electronics are housed in an all-aluminum, epoxy-coated enclosure rated for NEMA-4X (IP66). It withstands pressures to 500 psig and temperatures to 250°F. The process connection is either 1/2 or 3/4 in. MNPT with stainless-steel or Teflon ferrules.

Applications for ST50s include municipal and industrial wastewater aeration control systems, industrial and commercial blower and dryer in/out airflow controls, industrial manufacturing burner and furnace airflow control, HVAC duct/damper control, and aeration flow control in lakes, ponds, or aquaculture. ST50s run off 12 to 36 Vdc and 85 to 265 Vac.

1755 La Costa Meadows Dr.
San Marcos, CA 92078
(800) 863-8703

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