nn Fast response flow meter ideal for gas mass flow measurement applications nn 200 millisecond response to changes in flow rate nn Smart electronics permit field adjustment of critical flow meter settings nn Field validation of flow meter calibration nn Outstanding rangeability nn Optional 2 x 12 backlit LCD display nn Minimal flow blockage and low pressure drop nn CE approved nn Optional Modbus RTU Fast Response, High-Performance, Immersible Thermal Gas Mass Flow Meter DESCRIPTION ierra Instruments’ FastFlo™ 620S Immersible Thermal Mass Flow Meter provides an economical solution for gas flow measurement applications. The meter’s sensor offers long-term reliability and 200 millisecond response to changes in flow rate. The versatile microprocessor-based transmitter integrates the functions of flow-range adjustment, meter validation and diagnostics in a probe-mounted NEMA 4X (IP65) housing. Mass flow rate and totalized flow, as well as other configuration variables, can be displayed on the meter’s optional 2 x 12 backlit LCD panel. w w w.sier rainst r ument s .com The meter also provides an optical/galvanic isolated 4-20 mA output and two alarm outputs. The programmable transmitter is easily configured via RS-232 and Sierra’s Smart Interface™ Windows™ based software or three push buttons in the device. Modbus RTU is also supported. The 620S is suitable for pipes or ducts from 1-inch to 48-inches (DN5

DIMENSIONAL SPECIFICATIONS NEMA 4X —Front View (EN2) Length Chart NEMA 4X with Junction Box — Side View (EN4) NEMA 4X with Junction Box—Front View (EN4) 3.93 (99.8) Per Customer Cable Length Requirement, 200 Feet Maximum All dimensions are inches. Millimeters are in parentheses . Certified drawings are available on request.

PERFORMANCE SPECIFICATIONS Accuracy of Point Velocity +/- 1% of full scale 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, consult factory for other gases Response Time 200 milliseconds to 63% of final velocity value OPERATING...

ORDERING THE 620S TITLE (CONTINUED) Features 620S Parent Instructions: To order the 620S please fill in each number block by selecting the codes from the corresponding features below. Parent Number 620S FastFlo™ Insertion Mass Flow Meter. 18-30 VDC input power with a 3/8-inch in diameter probe. Includes "Smart Electronics" with PC configuration software, calibrated temperatures up to 176°F (80°C) and pressures up to 150 psig (10.34 barg). 200 msec response. CE approved. 4-20 mA, 0-10 VDC or 0-5 VDC linear output NOTE: ALL slpm flow ranges also available in nlpm. * Flow bodies are sized for nitrogen...