The 780S-UHP thermal mass meter is constructed with 316L electropolished tubing with 7-10 Ra (UHP) interior. The 780S-UHP is available in pipe sizes from 0.5 up to 12 inches (1.27 to 30.4 cm) and offered with buttweld connections and a VCR probe-connection fitting.

The 780S-UHP also features Sierra’s unique FlowTrak dual-plate flow conditioning element to eliminate velocity profile distortions as well as swirl and temperature stratification in the gas stream. This product reduces piping straight run requirements to as little as three upstream diameters.  As a result, you save money on installation costs when compared to an orifice-plate where at least 20 upstream piping diameters are required for optimal performance.

Operating Principle: Thermal dispersion technology provides direct mass flow measurement featuring: no pressure or temperature compensation needed; no moving parts; low pressure drop; and high turndown.

 

 

Product Benefits

Industry-choice for bulk gas distribution custody transfer service in semiconductor fabs Ultra high purity interior finishes Built and shipped to ultra high purity claen room standards Sierra's state-of-the-art ISO 9000 closed loop calibration facility for best accuracy Built-in flow conditioning elements drastically reduce upstream straight-run requirements Buttweld connections and a VCR probe-connection fitting Field Validation/Configuration to assure operating performance: Watch video

Field rangeability Flow totalizer and alarms Very low pressure drop No moving parts Flow-range adjustment and validation and diagnostics Dual-range capability Large LCD display and pushbutton interface, remote enclosure mounting available Free computer interface software: Download now

 

 

Specifications

Accuracy: +/- 1% of reading plus +/- 0.5% of full scale Repeatability: +/- 0.2% of full scale Pipe sizes from 0.5 to 12 inches (1.27 to 30.4 cm)  Flow range to 20,000 sfpm (100 smps) Measure all inert gases and all non-condensing clean gases Flammable gases: methane, propane, hydrogen, digester gas, natural gas Corrosive gases compatible with 316L stainless steel Turndown: 100:1  Temperature: Operating: -40°F to 350°F (-40°C to 200°C) Ambient: -40°F to 120°F (-40°C to 50°C) High temperature (HT) option to 750°F (400°C) Response time is one second to achieve 63% of final value Power supply: 18 to 30 VDC (regulated), 625 mA maximum 100 to 240 VAC, 50/60 Hz, 15 watts maximum Electropolished  7-10 Ra 316 stainless steel construction Output signals: RS-232, 0 to 5 VDC, 0 to 10 VDC, 4 to 20 mA   User definable pulse output for totalized flow Digital communications: Foundation Fieldbus, HART, Modbus RTU, and Profibus DP Hazardous-Area Location Enclosure (IP66) and NEMA 4X (IP65) Approvals: FM (USA) Class I, Div I, Groups B,C,D CSA and CRN (Canada) ATEX CE PED (EU) GOST R (Russian Federation) Chinese Pattern Approval (China)