Sierra Instruments, Inc.

- Model 780S - Inline Thermal Mass Flow Meters with Flow Conditioning

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North America's #1 selling inline thermal mass flow meter (2009 Flow Research, Boston MA) delivers precise measurements with heavy-duty industrial gas mass and air flow meter measurement applications.  Choose from a wide variety of inline and insertion thermal mass air flow meters for precision CFM (cubic feet per minute) measurement of gas mass flow rate in industrial environments.

Accurate monitoring of peak, low flow and total gas mass flow rates is a critical part of many industrial process control systems. The FlatTrak™ 780S offers improved measurement capabilities in installations where long straight pipe runs are not available. The meter:

  • Incorporates Sierra’s unique dual-plate flow conditioning element to eliminate velocity profile distortions, as well as swirl and temperature stratification in the gas stream
  • Reduces piping straight run requirements to as little as three upstream diameters
  • Saves you money on installation costs when compared to an orifice-plate where at least 20 upstream piping diameters are required for optimal performance

The 780S is GHG certified and routinely used to measure gas to boilers and burners and other process equipment, air volume flow metering, compressed air flow, combustion air flow, natural gas fuel flow, custody transfer and stack gas emissions flow monitoring.Operating Principal: Thermal dispersion technology for direct mass flow measurement featuring no pressure or temperature compensation needed, no moving parts, low pressure drop, high turndown.

  • Built-in flow conditioning elements drastically reduce upstream straight-run requirements
  • Features our no-drift DrySense velocity sensor
  • Lifetime warranty on sensor
  • Greenhouse Gas (GHG) certified to meet EPA (40 CFR Part 98)
  • Optimized (CH4) as well as N20, SF6, HFCs, PFCs and CO2, per the EPA mandate
  • Popular choice for landfill gas (LFG) measurement at low pressure (20 - 40 mBarg) and about 40-60°C (100°F) variable flows require a large turndown
  • Custom options available:
    • Wide range of process connections
    • Wide range of materials like Kynar and Hastalloy
    • Self-cleaning purge  for dirty flow environments
    • Ultra-High Purity 7-10 Ra to 20-25Ra interior finishes
  • Flow-range adjustment and validation and diagnostics
  • Dual-range capability
  • Field validation/configuration to assure operating performance
  • Field rangeability
  • Flow totalizer and alarms
  • Large LCD display and pushbutton interface, remote enclosure mounting available
  • An insertion version for pipes/ducts up to 72' (2M) available - Model 640S
  • Very low pressure drop
  • No moving parts
  • Free computer interface software
  • Digital communications: Foundation Fieldbus, HART, Modbus RTU, Profibus DP

  • Accuracy: +/- 1% of reading plus +/-0.5% of full scale
  • Repeatability of +/- 0.2% of full scale
  • Pipe sizes from 1.0' to 8.0'  (2.5cm  to 20.3cm) 
  • Flow range to 20,000 sfpm (100 smps)
  • Measure all inert gases and all non-condensing clean gases
  • Flammable gases: methane, propane, hydrogen, digester gas, natural gas
  • Corrosive gases compatible with 316L stainless steel
  • 100:1 turndown
  • Temperature:
    • Gas: -40°F (-40°C) to 350°F (200°C)
    • Ambient: -40° F to 120° F (-40° C to 50° C)
  • Response time is one second to achieve 63% of final value
  • Power supply 18 to 30 VDC (regulated), 625 mA maximum; 100 to 240 VAC, 50/60 Hz, 15 watts maximum

View All Specs

  • 316 stainless-steel construction (Other materials available)
  • Output signals: RS-232, 0–5 VDC, 0-10 VDC, 4–20 mA  
  • User definable pulse output for totalized flow
  • Digital communications solutions include: Foundation FieldbusHARTModbus RTU, and Profibus DP
  • Hazardous-Area Location Enclosure (IP66) and NEMA 4X (IP65)
  • Approvals:
    • FM (USA) Class I, Div I, Groups B,C,D
    • CSA and CRN (Canada)
    • ATEX
    • CE
    • PED (EU)
    • GOST R (Russian Federation)
    • Chinese Pattern Approval (China)

  • Accuracy : +/- 1% of reading + 0.5 % 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 : One second to 63% of final velocity value

Gases
Most gases compatible with 316 L stainless steel (consult factory)

Gas Pressure (2 limitations)
Mechanical design pressure:

  • Compression fittings: 500 psig (34.5 barg)
  • 150 lb flange or PN16 DN (-40° F to 100° F): 230 psig (15.9 barg)
  • 150 lb flange or PN16 DN (250° F): 185 psig (12.8 barg)
  • 150 lb flange or PN16 DN (450° F): 155 psig (10.7 barg)
  • NPT (-40° F to 250° F): 500 psig (34.5 barg)

Gas & Ambient Temperature

  • Gas . . . . . . . . . . . . . . -40° F to 350° F (-40° C to 177° C) Gas dependent,
  • Ambient . . . . . . . . . . -40° F to 120° F (-40° C to 50° C)

Leak Integrity
5 X 10-9 cc/sec of helium maximum

Power Requirements

  • 18 to 30 VDC (regulated), 625 mA maximum
  • 100 to 240 VAC, 50/60 Hz, 15 watts 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 400 VDC or VAC (peak), 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
  • High and low alarm settings

Totalizer

  • Seven 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
  • Zero cut-off adjustment
  • Linearization adjustment
  • Save / Load configurations
  • Fully guided flow meter validation

  • Foundation Fieldbus (read only; flow and totalized flow)
  • Profibus PA (read only; flow and totalized flow)
  • MOBDBUS RTU (read/write most parameters)
  • RS 232 (standard; command set available)

Wetted Materials
316L stainless steel
Carbon steel flow bodies available in some sizes

Enclosure
Hazardous-Area Location Enclosure (IP66) and NEMA 4X (IP65) are
powder-coated cast aluminum

Electrical Connections
Two 3/4 inch NPT . . . Hazardous-Area Location Enclosure (IP66)
One 1/2 inch NPT . . . NEMA 4X Enclosure (IP65)

Certifications

  • CE (All enclosures)
  • CSA (Explosion proof for Class I, Division 1, Groups B, C, D)
  • ATEX ( II 2 GD Ex d IIC T6 ... T2
  • IP 66 T70 °C ... T280 °C )
  • FM (Explosion proof for Class I, Division 1, Groups B, C, D; dust-ignition proof for Class II, III, Division 1, Groups E, F, G)
  • IP66, NEMA 4X T6 -40° C to 70° C ambient
  • PED optional

  • Reduce straight-run requirements with built-in flow conditioning
  • Eliminate drift with DrySense sensor
  • Needs only 3-diameters up, zero downstream
  • Validate in the field for easy in-situ calibration
  • Backed by lifetime sensor warranty

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