Insertion Mass Flow Meter - FastFlo™ 620S

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High-Performance Air Flow Sensor for Industrial Gas Mass Measurement

The FastFlo™ 620S – an insertion thermal air flow sensor that contains FastFlo® Sensor Technology and Smart Electronics – was designed to give you a highly reliable, responsive and affordable mass flow meter for light industrial applications where a NEMA 4X (IP65) enclosure is acceptable.

The 620S air flow sensor enclosure is available in probe-mount or remote-mount configurations and has a 316 stainless steel, 3/8-inch diameter insertion probe available in lengths from 3.7 inches up to 24 inches. 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 readout.

FastFlo™ 620S Air Flow Sensor

FastFlo™ 620S Air Flow Sensor

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Sierra Instruments Warranty & Support

Limited Warranty - Product - Liability for Repair and Replacement Only

All Sierra products are warranted to be free from defects in material and workmanship and will be repaired or replaced at no charge to Buyer, provided return or rejection of product is made within a reasonable period but no longer than one (1) year for calibration and non-calibration defects, from date of delivery. To assure warranty service, customers must register their products online on Sierra’s website. Online registration of all of your Sierra products is required for our warranty process. Register now at http://www.sierrainstruments.com/register. 

This warranty does not cover any damage or discoloration caused by corrosion due to gases, liquids, or any other source, nor does it cover normal wear of any seals in its products and with gases other than air, or unless otherwise specified in the contract. Such returns are contingent on Sierra's examination and reasonable satisfaction that any defects are covered by this warranty and that the Buyer has not returned the equipment in a damaged condition, due to any negligence, tampering, misapplication or product modification on the part of the Buyer or his agents. Sierra shall not be liable for installation charges, for expenses of Buyer for repairs or replacement, for damages from delay or loss of use, or other indirect or consequential damages of any kind.

Sierra extends this warranty only to Sierra products properly used and properly installed for the particular application for which intended and quoted, and this warranty does not cover products which have been modified without Sierra's approval or which have been subjected to unusual physical or electrical stress, alteration, or tampering, or upon which the original identification marks have been removed or altered. Whenever the design of the equipment to be furnished or the system in which it is to be incorporated originates with the Buyer, Sierra's warranty is limited specifically to matters relating to furnishing Sierra equipment free of defects in materials and workmanship and Sierra assumes no responsibility for implied warranties of fitness for purpose or use. Any replacement or repair shall be to Sierra's factory, unless otherwise directed. No items shall be returned for warranty repair without prior written authorization from Sierra.

Note: Sierra’s InnovaSwitch™ Flow Level Switches come with a two (2) year warranty with the above stipulations. 

Lifetime Limited Warranty on Patented DrySense™ Sensor Technology

In addition to Sierra’s standard one (1) year manufacturing warranty on all instruments produced, Sierra also offers a lifetime warranty on all DrySense™ sensors standard with Sierra models 640i, 780i, 640S, 780S, and 670S instruments sold after January 1, 2010.  This warranty does not extend to the Model 620S, the BoilerTrak™, the HT (High Temperature) 640S/780S sensor or the 780S UHP (Ultra High Purity) sensors. To assure warranty service, customers must register their products online on Sierra’s website. Online registration of all of your Sierra products is required for our warranty process. Register now.

Download Sierra Products Warranty Statement

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2 Year Warranty Coverage for Flow Switches

Sierra offers a two (2) year warranty coverage for our entire line of InnovaSwitch™ Flow Level Switches beginning July 1, 2010.

Technical Support

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Technical Details

  • +/- 1.0% of full scale accuracy
  • 200 msec time-response time
  • NEMA 4X (IP65) enclosure
  • Field validation & diagnostics
  • Field adjustment
  • 2 x 12 backlit LCD readout
  • 3/8-inch diameter insertion probe
  • Probe lengths up to 24”
  • 316 stainless steel construction
  • Digital communications solutions include: Modbus RTU.

Product Information

The FastFlo™ 620S – an insertion thermal air flow sensor that contains FastFlo® Sensor Technology and Smart Electronics – was designed to give you a highly reliable, responsive and affordable mass flow meter for light industrial applications where a NEMA 4X (IP65) enclosure is acceptable.

  • Accuracy is +/- 1.0% of full scale, 0.2% of full scale repeatability
  • NEMA 4X insertion mass air flow sensors measure air, nitrogen or any other inert gas with a fast, 200-millisecond response time
  • High-accuracy glass sensor technology
  • Available in 1, 2, 3, 4, inch schedule 40 pipe sizes

This airflow sensor – which includes a compact, versatile, microprocessor-based transmitter – integrates flow-range adjustments and meter validation and diagnostics, giving you the ability to “field-validate” your meter’s calibration.

Sierra’s digital communications solutions offer engineers and systems integrators, full industrial system integration and networking capability with Sierra's light industrial flow meters. Digital communications solutions include: Modbus RTU. This flexibility of communication features offers turnkey solutions for integration of Sierra's vortex flow meters into any industrial automation system or application.

Operating Principle

Sierra’s unique FastFlo 620S sensor probe is responsible for the unsurpassed accuracy and reliability of Sierra mass flow meters. The sensor consists of two sensing elements–a velocity sensor and a temperature sensor which automatically corrects for changes in gas temperature. When power is applied to the flow meter, the transducer electronics heats the velocity sensor to a constant temperature differential above the gas temperature and measures the cooling effect of the gas flow. The electrical power required to maintain a constant temperature differential is directly proportional to the gas mass flow rate. The meter electronics measure this power and convert it into a linear 0-5 VDC (0-10 VDC optional) and 4-20 mA output signal.

The FastFlo sensors are reference-grade platinum resistance temperature detectors (RTD) encapsulated in glass. The platinum RTD wire is wound on a rugged ceramic mandrel for strength and stability. The sensor is located at the tip of a 0.375 inch (3/8”) diameter, 304 stainless steel probe which is inserted in the gas stream. The 620S electronics are packaged in a weather-proof NEMA 4X (IP65) enclosure mounted either directly on the sensing probe or remotely up to 100 feet (60 meters) away.