Sierra Instruments QuadraTherm 640i and 780i air flow meters

Sierra Instruments QuadraTherm 640i and 780i air flow meters have received global approvals for the following standards of safe operation in potentially hazardous environments: cFMus (USA and Canada), ATEX (European Union) and IECEx (International). This signifies that the QuadraTherm is certified as flame-proof and protected from dust ignition sources, and meets all design criteria for electrically powered flow meters used in areas where combustible gases may be present.

The IECEx and ATEX certification programs ensure explosion-proof and hazardous area compliance in the European Union and international destinations. The cFMus certification program ensures explosion-proof and hazardous area compliance in the United States and Canada. With approvals, QuadraTherm is approved for applications in hazardous plant areas like facilities management, chemical processing, oil and gas, wastewater, and natural gas throughout the European Union and international communities.

The QuadraTherm provides an accuracy of ±0.5% of reading above 50% of full scale for flow meter air measurement and other gases. It also offers built-in flow conditioning (inline version), has multivariable outputs and can measure flow ranges up to 60,000 sfpm (305 smps).

It is available in two models: the 640i insertion and 780i inline. The QuadraTherm family has a no-drift sensor with lifetime warranty; has multivariable output for mass flow, temperature and pressure (optional); and measures all inert and all non-condensing clean gases, as well as flammable gases (methane, propane, hydrogen and digester gas). Repeatability for mass flow rate is ±0.15% and gas accuracy is ±1°C.