Sierra FastFlo™ - Model 620S - Fast-Response Insertion Thermal Mass Air Flow Sensor
The FastFlo 620S is an insertion thermal mass air flow sensor designed to give you a highly reliable, responsive and affordable mass flow measurement for light industrial applications where a NEMA 4X (IP65) enclosure is acceptable.
Details:
This mass airflow sensor:
- Includes a compact, versatile, microprocessor-based transmitter
- Integrates flow-range adjustments, and meter validation and diagnostics
- Gives you the ability to “field-validate” your meter’s calibration
How does a thermal mass flow meter for industrial applications work? An insertion thermal air flow sensor provides precision measurement of total mass flow rate of gases flowing through closed conduits such as pipes and ducts. Thermal dispersion technology for direct mass flow measurement features: no pressure or temperature compensation needed, no moving parts, low pressure drop, and high turndown.
Product Benefits
- Ideal for OEMs and for compressed air monitoring
- Smart electronics permit field adjustment of critical flow meter settings
- Programmable pulse output for remote totalization
- Minimal flow blockage and low pressure drop
- Field flow-range adjustment, meter validation and diagnostics
- Program transmitter via RS-232 using free user software or with three push-buttons on display interface
- Sierra's state-of-the-art ISO 9000 calibration facility matches each application for best accuracy
- Flow-range adjustment and validation and diagnostics
- Field validation/configuration to ensure operating performance
- Flow totalizer and alarms
- 2 x 12 backlit LCD display totalizer values
- Remote enclosure mounting available
- No moving parts
- Free computer interface software
Specifications
- Measure air and all clean inert gases
- Accuracy: +/- 1% of full scale
- Repeatability of +/- 0.2% of full scale
- Pipe sizes from 3.7' (9.3cm) up to 24' (61cm)
- Small-diameter, 3/8-inch (9.5mm) sensor probe
- 100:1 turndown
- Temperature:
- Gas: 40°F to 176°F (-40°C to 80°C)
- Ambient: -40°F to 120°F (-40°C to 50°C)
- Response time is 200 milliseconds to achieve 63% of final value
- Power supply 15 to 18 VDC (regulated), 625 mA draw maximum
- Output signals: Linear 0–5 VDC and 4-20 mA
- User definable pulse output for totalized flow
- Digital communications solutions include: Modbus RTU
- Enclosure NEMA 4X (IP65); remote electronics mounting available
- CE approved
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 Specifications
Gases
Most non-corrosive gases
Gas Pressure
120 psig (8 barg) maximum design pressure
Pressure Drop
Negligible
Gas & Ambient Temperature
Gas . . . . . . . . . . . . . . -40° to 176°F (-40° to 80°C)
Ambient . . . . . . . . . . -40° to 120°F (-40° to 50°C)
Power Requirements
18 to 30 VDC (regulated), 625 mA maximum
Output Signal
Linear 0–5 VDC or 0-10 VDC, 1000 ohms minimum load resistance or
Linear 4–20 mA proportional to mass flow rate,
700 ohms maximum resistance power supply dependent User-selectable. Active non-galvanically separated or passive galvanically separated (loop power required)
Alarms
Hard contact user-adjustable high and low
Dead band adjustable with Smart Interface software
Relay ratings . . . . . . . Maximum 42 VAC or 42 VDC, 140 mA
Displays
Alphanumeric 2 x 12 digit backlit LCD
Adjustable variables via on-board switches (password protected) or with Smart Interface software
Adjustable variables. . Full scale (50 to 100 %)
Time Response (1 to 7 seconds) Correction factor setting (0.5 to 5) Zero and span
Totalizer
Eight digits (9,999,999) in engineering units
Resettable by software, on-board switches or external magnet
Software
Smart Interface Windows-based software
Minimum 8 MB of RAM, preferred 16 MB of RAM
RS-232 communication
Additional features. . . Alarm dead band adjustment
Low flow cut-off adjustment
Linearization adjustment
Save / Load configurations
Flow meter validation
Physical Specifications
Wetted Material
Probe . . . . . . . . . . . . . 316SS
Sensor . . . . . . . . . . . . 304SS, glass coating epoxy
Enclosure
NEMA 4X (IP65) powder-coated cast aluminum
Electrical Connections
One 1/2-inch female NPT
Mounting (optional)
3/8-inch tube compression fitting with 1/2-inch male NPT
Weldolet
Flat Duct Bracket
Curved Duct Bracket
Certifications
CE approved
Applications
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Flow measurement instrumentation for waste water treatment flow solutions - Water and Wastewater - Water Treatment
With its high turndown and direct mass flow, our immersible thermal meters are the instrument of choice for measuring aeration basin air flow and monitoring digester gas. Our multivariable vortex meters are used to measure steam in the cogeneration processes, while our ultrasonic flowmetersare used for influent and effluent measurement.
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Argon mass flow meters flow solutions - Monitoring and Testing
Thermal mass flowmeters and controllers are ideal for Argon application where precision is key. Sierra specializes in accurate mass flow measurement and/or control of Argon gas. Popular applications range from general industrial process control, inerting and steel purification processes to name a few.
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Carbon dioxide mass flow meters flow solutions - Air and Climate
Thermal mass flowmeters are ideal for Carbon Dioxide metering and mass flow control. Sierra specializes in accurate mass flow measurement and/or control of CO2 gas. Applications range from general industrial process control across numerous industries to Green House Gas monitoring requirements and general research.
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Nitrogen mass flow meters for solutions - Monitoring and Testing
Sierra specializes in accurate mass flow measurement and/or control of Nitorgen gas. One of the most commonly measured gases, applications are found across numerous industries ranging from general process control to scientific research and development.
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Flow meters for the process control & manufacturing flow solutions - Monitoring and Testing
Most chemical reactions are based on direct mass flow readings, and thus, Sierra`s immersible thermal mass flow meters and our volumetric vortex and multivariable mass vortex flow meters see extensive used in oil, gas and steam measurement. In addition, process liquid flows can be addressed with our non-intrusive clamp-on ultrasonic flow meters. Finally, our capillary thermal mass flow meters and controllers are perfect for semiconductor processing applications.
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Flow measurement instrumentation for gas flow solutions
Sierra offers a complete line of gas mass flow meters and gas flow controllers for most gases, including corrosives and ultra-high purity gases. All of our mass flow meters and flow controllers offer direct mass flow measurement, meaning they do not require pressure or temperature compensation. In addition, Sierra is one of the few companies who can offer solutions for very small flows 94 sccm up to flows in 72-inch pipes.
Videos related to this product
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In-Situ Thermal Mass Flow Meter Calibration Validation - Video
One of the great benefits of thermal mass flow meter technology is in-situ calibration validation. Learn how the DrySense sensor stability found in Sierra thermal mass flow meters is the only way in-situ calibration validation is actually valid. Sensor drift can create false positives and reduce the reliability of validation. Only with sensor stability that Sierra’s thermal mass flow meters possess can users truly validate a thermal mass flow sens
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