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28265 Beck Road, Suite C-11 Wixom, MI 48393 U.S.A.

(248)-380-3569

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SERIES GM, GV* : Mass and Volumetric Flow Meters for Air and Gases

SURE FLOW PRODUCTS

Mass & Volumetric Gas Flow Metere

FEATURES/BENEFITS:

  • Full scale flow ranges from 0.5 SCCM to 3000 SCFH
  • Connection sizes from 1/8-inch to 3/4-inch NPT
  • Construction materials: Stainless Steel
  • Battery powered LCD that displays rate, temperature, and pressure with an option for total
  • Transmitter outputs include open collector contacts, RS communications, 5 VDC, or optional 4-20mA for flow/temperature, or flow/pressure
  • A quick response time of 5 milliseconds or less
  • Accuracy is 1% of full scale flow rate
  • No moving parts
  • Up to 14 field selectable gases or gas mixtures
  • Optional portable, battery powered flow meter
  • Optional flow controller
    * FACTORY PRE-CALIBRATED TO CUSTOMERS SPECIFICATION

GENERAL DESCRIPTION:

The SURE FLOW PRODUCTS GM and GV Series flow meters use two of the best-studied physical properties of gases to measure flow: Pressure and Viscosity. Differential pressure measurement, across a laminar flow element, results in a flow meter that is inherently linear and accurate. These flow meters measure differential pressure within the laminar region, to achieve a turndown ratio better than 100:1 typical. Gas units are available with full-scale flow ranges from 0.5 (S)CCM to 1000 SLPM (2100 SCFH) with related process connection sizes of 1/8, 1/4, 1/2, and 3/4 inch NPTF.

The GM Series “NON-THERMAL” Mass Flow Meters use discrete Differential Pressure, Absolute Pressure, and Temperature Sensor measurements within the laminar flow region to determine mass flow. The integral microprocessor provides a software-based STP calculation compensated for pressure and temperature to standard conditions (1 atmosphere 25°Celsius). The GM Series addresses the limitations of thermal mass flow technologies, as there is no “Hot Wire” drift. The unit has an adjustable response time starting from 10 milliseconds. The dynamic display shows mass flow, volumetric flow, temperature, and absolute pressure simultaneously. A totalizing display is also available. The push button interface allows the user to select from the primary display, the required gas (14 standard gases featured), adjust meter response time, or tare the meter at zero flow.

The optional 9-volt battery pack (Series GM-P) makes this unique Mass Flow Meter portable and ideal for as a hand held test and calibration tool.

The GV Series Volumetric Gas Flow Meters are designed for applications venting to atmosphere, with little to no backpressure. They do not include absolute pressure or discrete temperature sensors, which makes them an affordable alternative to mass flow meters. As with the GM Series, the volumetric flow meters use discrete differential pressure sensor measurements within the laminar flow region to determine flow.

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Why SURE FLOW PRODUCTS Flow Meters?

  • No Mechanical Moving Parts to Service or Fail
  • Continuous Display of Flow Rate, Pressure, and Temperature – total optional
  • Outputs for flow and temperature or flow and pressure
  • User Friendly Push Button Interface
  • No Hot Wire Thermal Drift
  • NIST Traceability
  • Accurate Low-Flow Measurements
  • CE

Design Features

  • Full Scale Rangesfrom 0.5(S)CCM to 1000 SLPM+
  • Response time of 10 milliseconds typical
  • Repeatability of .25% of Rate
  • Typical Low Pressure Drop of 10″ Water Column or better
  • Turndown Ratio of 100:1 typical
  • Position Insensitive
  • Push Button Tare
  • Accuracy of +/- 1% full scale with optional +/- 0.5% full scale
  • 14 Gas Selectability without re-calibrtion (with display only)

Options

  • Portable
  • Totalization Display
  • Flow Controller
  • Manual Valve
  • Outputs: 4-20mA, 0 to 5 Volts, RS232
  • Electrical Cables/Pin Connectors
  • AC/DC Power Adapter
  • Special Gas Blends
  • Remote Digital Displays (LCD)
  • Customized Pressure Drop
  • Independent Output of Variables

Applications

  • Weld Shielding Gases
  • Burner Gas
  • Gas Consumption
  • Gas Blending
  • Gas Chromatography
  • Leak Testing
  • Assist Gases
  • Medical
  • Industrial
  • Process Control
  • Laboratory
  • OEM
  • Thermal Mass Meter Replacement

 

SPECIFICATIONS MASS VOLUMETRIC ENGINEERING UNITS MAXIMUM FLOW RATE
Accuracy* +1- 1% (0.5% opt) +/- 1% (0.5% opt) Full Scale 0.5 (S)CCM
Repeatability +/- 0.5% +/- 0.5% Full Scale 1 (S)CCM
Turndown Ratio 100:1 100:1 Full Scale 2 (S)CCM
ResponseTime (adjustable) +/-10 +/-10 Milliseconds 5 (S)CCM
Pressure Drop ( < 20SLPM) ** 0.4 0.4 PSID 10 (S)CCM
( < 50SLPM) 0.8 0.8 PSID 20 (S)CCM
( < 500SLPM) 1.25 1.25 PSID 50 (S)CCM
( < 1000SLPM) 3.25 3.25 PSID 100 (S)CCM
Operating Temperature 0 to +50 0 to +50 °C 200 (S)CCM
Zero Shift 0.02% / ATM 0.02% Full Scale / °C 500 (S)CCM 1 (S)CFH
Span Shift 0.02% / ATM 0.02% Full Scale / °C 1 (S)LPM 2 (S)CFH
Humidity Range 0-100% 0-100% Non-Condensing 2 (S)LPM 4 (S)CFH
Over Range of Full Scale + 2.4% + 2.4% Full Scale 5 (S)LPM 10 (S)CFH
Maximum Pressure 125 125 PSIG 10 (S)LPM 21 (S)CFH
Supply Current (Typical) 30 30 Milliamp 20 (S)LPM 42 (S)CFH
Supply Voltage 7-30 7-30 Volts DC 50 (S)LPM 105 (S)CFH
Outputs *** 0-5V dc, 0-10V dc, 4-20mA, RS-232 Mass, Vol., PSI or ° C 100 (S)LPM 210 (S)CFH
Electrical Connections 8 pin 8 pin Circ. Mini DIN/Multi Pin 250 (S)LPM 530 (S)CFH
Process Connections 1/8″ < 20SLPM NPTF 500 (S)LPM 1060 (S)CFH
1/4″ < 100SLPM 1000 (S)LPM 2100 (S)CFH
1/2″ < 250SLPM
3/4″ < 1000SLPM
Wetted Materials Anodized AL, 303 and 302 Stainless Steel,Viton®, Silicone RTV, Glass Reinforced Nylon

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NOTES:

* 0.5% Option not available on 0.5(S)CCM or 100(S)LPM + Flow ranges

** For controllers, please consult SURE FLOW PRODUCTS

*** Battery powered flow meters are not available with 4-20mA output or 0-10Vdc

Please consult SURE FLOW PRODUCTS for information regarding flow controllers, alarm outputs, totalizers, remote displays, and other available accessories.

Flow Range A* B C D E NPT SIZE
to 20 SLPM 4.082 2.375 1.050 .358 .525 .125
21 to 50 SLPM 4.417 2.626 1.050 .358 .525 .250
51 to 100 SLPM 4.367 3.500 1.675 .390 .800 .500
101 to 250 SLPM 4.967 4.000 1.600 .913 .800 .500
251 to 1000 SLPM 4.970 4.000 1.600 .800 .800 .750

NOTE: All dimensions are shown in inches. *For Portable/Battery Pack Meters add 2.25 Inches

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