FEATURES ■ Direct mass flow monitoring eliminates need for separate temperature and pressure inputs ■ Accuracy +/- 1% of reading plus 0.5% of full scale ■ Patented Dry-Sense™ technology eliminates sensor drift ■ State-of-the-art calibration facility insures a highly accurate calibration that matches the application ■ Field validation of meter electronics and sensor resistance verifies flow meter performance ■ One-second response to changes in flow rate ■ FM, CSA, PED, ATEX and GOST R/RTN certified for hazardous areas ■ CE approved ■ High temperature option to 750°F (400°C) available ■ Multipoint options available ■ Integrated self-cleaning purge option available for dirty flows ■ Low and high pressure hot taps available ■ Optional HART, Modbus and Profibus DP available, Foundation Fieldbus (pending) DESCRIPTION Sierra Instruments' SteelMass® Model 640S immersible thermal mass flow meter is designed for the toughest industrial gas flow measurement applications. The versatile microprocessor-based transmitter integrates the functions of flow measurement, flow-range adjustment, meter validation and diagnostics in either a probe-mounted or remote housing. Mass flow rate and totalized flow, as well as other configuration variables, are displayed on the optional 2 x 12 LCD display. The programmable transmitter is easily configured via an RS-232 communication port and Sierra's Smart Interface™ software, or via the display and magnetic switches on the instrument. SIERRR* www.sierrainstruments.com Sierra's state-of-the-art calibration facility insures that the calibration will match the application, and our patented Dry-Sense™ thermal sensor insures the Model 640S will hold this calibration over time. Sierra's Smart Interface™ software guides you through a procedure to fully validate instrument performance, thus field-verifying meter functionality. The meter is available with a variety of input power, output signal, mounting and packaging options. The information contained herein is subject to change without notice.

HAZARDOUS-AREA LOCATION ENCLOSURE DIMENSIONAL SPECIFICATIONS Compression Fitting—Side View (E2) Compression Fitting—Front View (E2) Length Chart (Compressions Fittings) Flange Mounting—Side View (E2) Flange Mounting—Front View (E2) Length Chart (Flange Mounting) Remote Mount Junction Box—Side View (E4) Remote Mount Junction Box—Front View (E4) Length Chart (Remote Mount Junction Box) Remote Mount—Side View (E3, ATEX only) Remote Mount — Front View (E3, ATEX only) Mounting Holes for Remote Bracket All dimensions are inches. Millimeters are in parentheses. All drawings have a +/-.25-inch (6.4 mm)...

HAZARDOUS-AREA LOCATION ENCLOSURE DIMENSIONAL SPECIFICATIONS NEMA 4X DIMENSIONAL SPECIFICATIONS SELF-CLEANING PURGE OPTION • Maximum process pressure 100 Psi • Maximum process temperature 500 F. • Max pressure purge air: 150 Psi • Process connection Purge air 1/4" NPTF • Wetted Process Parts: all 316SS • The purge gas must be clean and dry. Do not use a liquid to clean the sensor inline • The purge system is only available with E4 and E2 housings • The purge system is NOT available with FM, ATEX or CSA approval or the high temperature option Warning: During the purge cycle there will be a high...

Side View 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 + D/2 + T So L must be equal or greater than 12-inches plus the height of the "Threadolet" plus half the duct O.D. R = D/2 + T + 8.8 All dimensions are inches. Millimeters are in parentheses. All drawings have a +/-.25-inch (6.4 mm) tolerance. Certified drawings are available on request. Select an installation site that will minimize possible distortion in the flow profile. Valves, elbows, control valves and other piping components...

Accuracy of Point Velocity +/- 1 % of reading + 0.5% of full scale. Note: Overall accuracy of HT meters may be de-rated due to temperature and velocity conditions. Repeatability +/- 0.2% of full scale Temperature Coefficient +/- 0.02% of reading per °F within +/- 50° F of customer specified conditions +/- 0.03% of reading per °F within +/- 50° F to 100° F of customer specified conditions +/- 0.04% of reading per °C within +/- 25° C of customer specified conditions +/- 0.06% of reading per °C within +/- 25° C to 50° C of customer specified conditions Pressure Coefficient .02% per psi for air,...

O2 Cleaning. Meters up to 4 inches (DN100). Includes certification. Product cleaned for O2 service. Inspected with Ultra-Violet light only, double-bagged prior to shipment.

Sierra Instruments, North America  • 5 Harris Court, Building L • Monterey, California 93940 • (800) 866-0200 • (831) 373-0200 • Fax (831) 373-4402 • www.sierrainstruments.com Sierra Instruments, Europe  • Bijlmansweid 2 • 1934RE Egmond aan den Hoef • The Netherlands • +31 72  5071400 • Fax: +31 72  5071401 Sierra Instruments, A sia  • Second Floor Building 5 • Senpu Industrial Park • 25 Hangdu Road Hangtou Town • Pu Dong New District • Shanghai, P.R. China 201316 • +8621 5879 8