QuadraTherm The Thermal Mass Flow Meter for High Accuracy Air, Gas, and Mixture Flow Measurement
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The Thermal Mass Flow Meter for High Accuracy Air, Gas, and Mixture Flow Measurement

Thermal mass flow you never imagined possible. Manufacturing and industrial process control depend on the highest accuracy air, natural gas, and gas mixture flow measurement possible to assure maximum productivity, efficiency and end-product quality. Today, Sierra’s revolutionary QuadraTherm® 640i and 780i deliver the world’s most accurate thermal mass flow measurements. Accuracy is as good as, if not better, than Coriolis, at a fraction of the price. Now experience precise mass flow rate, temperature and pressure measurement from a single device. In the late 1990’s, Sierra experienced its...

• Accuracy: +/- 0.5% of reading (inline); +/- 0.75% of reading (insertion) QuadraTherm is the first thermal mass flow meter to come with comprehensive software apps for ease of use, field adjustment, and calibration validation. • Gases: Air, natural gas, mixtures, flammables, inert gases • Flow rates: Down to 0.03 smps (0.1 sfps) & up to 305 smps (60,000 sfpm) • Pipe/duct sizes up to 72” (182 cm) • Hot-tap probe retractor • 100:1 turndown • Free user software • Multivariable: Mass flow rate, temperature & pressure Easily change pipe sizes and measured fluid in the field with apps like...

3 The user can also collect flow and composition trend analysis, flow alarming, and triggers. Sierra has many more apps under development to enhance your product experience. When released, you can immediately download and begin using them. SierraLoop World Class Calibration Designed by Sierra and located at our metrology headquarters in Monterey, California, SierraLoopTM is among the world’s most accurate private gas flow calibration facilities. Rated at +/- 0.3% of reading, all calibrations follow the guidelines of ISO 17025 and are traceable to national standards such NIST (United States...

PERFORMANCE SPECIFICATIONS Gas Measured 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 qTherm Gas Library: most common gases and mixtures; air is standard; qTherm Dial-A-Gas option for choice of three additional gases Mass Velocity Range for Air 0 to 60,000 sfpm (0 to 305 smps) at 70°F (21.1°C), 1 atm Multivariable Outputs Mass flow rate (standard) Temperature (standard) Pressure (optional) Totalized flow: totalized value is stored in non-volatile memory Mass Flow...

TABLE 1: qTherm Dial-A-Gas Selection Chart 780i Accuracy Gas Carbon Dioxide Special Calibration Request (SCR) Special Calibration Request (SCR) Special Calibration Request (SCR) Special Calibration Request (SCR) Notes: (1) % of reading at >50% of full scale flow; add 0.5% of full scale below 50% of full scale flow (2) % of full scale (3) Air is standard on the instrument and cannot be removed (4) The qTherm Gas Library is a proprietary gas property index that is continually updated and improved TABLE 2: 640i/780i Straight Run Requirements Upstream 640i Insertion Upstream 780i Inline with...

640i INSERTION DIMENSIONAL DRAWINGS P2-DD—Side View P2-DD Flange Fitting—Side View cFMus, ATEX, IECEx Approved Probes ( > 13” ) P2-DD Compression Fitting—Side LView Note: All dimensions in inches with (mm) in brackets; certified drawings available upon request. All drawings have ± .25 inch (6.4 mm) tolerance. Length Chart 640i Compressions Fittings Code Length Chart 640i FM Version Length Chart 640i Flange Mounting

640i INSERTION DIMENSIONAL DRAWINGS Remote Probe VT—Front View 6.7 Remote Electronics VT, VTP—Side View (170) 6.7 (170) Remote Probe VT—Side View 2.6 (66) PER CUSTOMER CABLE LENGTH Per customer REQUIREMENT cable 200 FEET MAXIMUM length requirement 200 feet maximum Remote Probe VTP—Front View Remote Probe VTP—Side View 4.7 (120) P3-DD Remote Bracket—Side View P2-DD Remote Bracket—Side View Remote Bracket—Front View Note: All dimensions in inches with (mm) in brackets; certified drawings available upon request. All drawings have ± .25 inch (6.4

Mounting Holes for Remote Bracket Length Chart 640i Remote Mount Junction Box 640i INSERTION LOW PRESSURE HOT TAP to 150 psig (10.3 barg) DIMENSIONAL DIMENSIONS 7.6 (193) L M2 Threadolet or customer supplied 1-inch weldolet 4.0 (101.6) Restraint cable, length=R 6.7 (170) 1-inch NPT hot tap Teflon packing gland Variables L = Nominal Probe Length D = Duct O.D. C = Duct I.D. T = Height of “Threadolet” or Customer Provided Weldolet R = Restraint Cable Length Formula L > 12.3 + T + D/2 So L must be equal or greater than 12.3-inches plus the height of the “Threadolet” plus half the duct O.D. R =...

780i INLINE DIMENSIONAL DRAWINGS 1/2” Through 1 1/2” NPT—Side View 1/2” Through 1 1/2” NPT—Front View 1/2” Through 1 1/2” 150 Class FlangeSide View Flow Conditioning Element (see TABLE 2, page 5) 1/2” Through 1 1/2” 150 Class FlangeFront View 6.7 Sizes For ANSI Class 150 Flange Flow Conditioning Element (see TABLE 2, page 5) NPT Remote Electronics—Side View 150 Class Flange Remote—Front View 6.6 (168) Per customer cable length requirement 200 feet maximum Per customer cable length requirement 200 feet maximum Per Customer L2 Cable Length Requirement 200 Feet Maximum Note: All dimensions in...

780i INLINE DIMENSIONAL DRAWINGS 10 2” Through 8” 150 Class Flange —Side View 6.7 Sizes for ANSI Class 150 Flanges (170) Flow Conditioning Element (see TABLE 2, page 5) 2” Through 8” NPT—Side View 2” Through 8” NPT—Front View Sizes for 1-inch Through 8-inch NPT Flow Conditioning Element (see TABLE 2, page 5) Flange Remote—Front View Per Customer Cable Length Requirement 200 Feet Maximum

Dial-A-Gas Selection Instructions: To order a 640i, please fill in each feature number block by selecting the codes from the corresponding features below. *Feature 10 is air (always included) Thermal Insertion Mass Flow Meter; all 316L stainless steel construction; linear 4-20 mA output signals for Mass Flow Velocity and Temperature, temperatures -40°F to 392°F (-40°C to 200°C); pressure to 500 psig (34.5 barg); standard accuracy (air) +/- 0.75% of reading above 50% of full scale flow and +/- 0.75% of reading plus 0.5% of full scale below 50% of full scale flow; includes qTherm™ Electronics...