Thermal Mass Flowmeter

• 316SS construction
• Range of process connections
• Field Validation/Configuration
• 2% reading accuracy
• Very large installed base
• Removable probe for recal/service
• In-line flow conditioning
• Meters all process gases

The Model 780S Flat-Trak™ 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. This product reduces piping straight run requirements to as little as three upstream diameters. As a result, you save money on installation costs when compared to an orifice-plate where at least 20 upstream piping diameters are required for optimal performance.

The Model 780S is available in pipe sizes from 1/4-inch to 8-inches in a choice of NPT, Buttweld or ANSI 150 lb. flanged design (300 lb. flanges optional). Larger sizes are available upon request. This meter features Sierra's well-known Smart Electronics Package for field-rangability, field flow-range adjustment, and field validation and diagnostics. The Model 780S has outstanding low-velocity sensitivity and exceptional accuracy.

The Model 780S is hazardous area approved for FM, CSA, EEx, PED, CE, CENELEC and is also available with a NEMA 4X (IP65) enclosure. Product accuracy is ±2% of reading, 0.2% of full scale repeatability.

High Performance Flow Control
The Brooks Instrument GF100 is a robust upgrade for standard high purity (HP) mass flow controllers, offering improved accuracy and cleanliness. Optional electrical adapters ensure drop in compatibility with older style analog flow controllers. Brooks’ new sensor technology with improved signal to noise performance and powerful control algorithms deliver enhanced measurement accuracy and reproducibility for optimal gas chemistry control.
The GF100 is designed for long-term reliability with embedded diagnostics and automated zeroing to reduce maintenance for a lower cost of ownership.

• High purity construction with reduced surface area and removal of unswept volumes for faster dry-down during purge
• Surface passivated high purity wetted flow path
• 10 μ inch Ra surface finish
• Independent service and diagnostic port for on-tool troubleshooting and process fingerprinting and optimization
• Integrated high visibility LCD display reports flow (%) and temperature (°C)
• Analog and Serial (RS-485), analog 0–5 VDC and DeviceNet™ communication interfaces
  

IN-FLOW Select Series Mass Flow Meters/Controllers are thermal, bypass-type, mass flow meters of modular construction with a 'industrial style' pc-board housing. Control valves can either be integrally or separately mounted, to measure and control gas flows from: lowest range 0,014 ... 0,7 mln/min up to highest range 8 ... 1670 ln/min The control valve design distinguishes itself from competitive designs in its truly modular construction and it can be field replaced or changed by the user without any adjustment. The standard valve is normally closed and is available up to Kv-values of 6.0. Normally opened valves can also be supplied.

• High accuracy (standard 0,5% of Rd plus 0,1% of FS)
• Rangeability in digital mode up to 187,5 : 1
• Optional Multi-Gas / Multi-Range functionality: freely programmable ranges and gas types
• Pressure rating 64 /100 bar (Multi-Gas / Multi-Range functionality up to 10 bar)
• High pressure versions available (up to 700 bar)
• Rugged, weatherproof housing (IP65, dust and waterproof)
• Option: ATEX approval for Zone 2
• Analog or digital communication (RS232 or fieldbus interface)
• High flow versions available (up to 11000 m3n/h)

• Supports up to 23 Engineering Units (including User Defined).
• Stores calibration data for up to 10 gases.
• Programmable Totalizer indicates total gas quantity.
• High and low gas flow Alarm limits with preset delay interval.
• Two sets of user-programmable electromechanical SPDT relays with latch option.
• User-selectable analog 0-5 Vdc or 4-20mA outputs.
• Internal Conversion factors for up to 32 gases.
• Digital Interface (RS-232 / RS-485, Profibus DP available).
• Multi-Drop Capability of up to 256 units (RS-485 option).
• Optional Profibus DP interface with I&M functionality.
• Automatic sensor zero offset adjustment (via digital interface or local push button).
• Self-Diagnostic Tests.
• Local 2 x 16 characters LCD display* with adjustable back light (optional).
  

• First mass flow meter with battery power
• At least two years of autonomy
• CMOS sensor technology
• On-the-spot direct reading, including bar graph
• Extremely compact unit
• Insensitive to pressure and temperature changes
• High accuracy and turndown ratio
• No moving parts
• Resistant to pressure bumps
• No restriction on installation position
• No inlet section required
• Optional 24 Vdc supply, manual valve & switch
• 3-year warranty
  

This Multi Gas / Multi Range instrument has the following features

• Clear indication in:
  • actual flow rate (bar graph and value)
  • desired flow units (59 units selectable)
  • type of gas (standard 10 pre-installed)
  • totalized flow (in several units)
  • Bright, wide-angle OLED display
• Low pressure drop
• Virtually independent of pressure and temperature variations
• High accuracy and turndown ratio (1:100)
• No moving parts in the flow channel
• High and low alarm settings with programmable delay with 2 integrated relays
• Batch counter function
• Analog (0..5 Vdc) and digital communication (Modbus-RTU, RS-232 interface)
• Configurable password protection
• 10 pre-installed gases (Air N2 O2 CO Ar CO2 CH4 C3H8 C4H10 N2O) available or He or H2
• 4 selectable ranges (100%, 50%, 25% and 10% of maximum fullscale range)
• Digitally calibrated
• Zero offset adjustment per gas
• Installable in any position (flipscreen function available)
• 3 years warranty

The Thermal Mass flow meters has many uses and probably too many to be listed on Flow Meter Directory. From applications which involve detecting leaks in compressed air flow systems to natural gas systems billing and demand control. In a natural gas line the thermal mass flow meter can also be applied to “leak checking” applications downstream of a shut off valve. In these cases it is practical to use a non custody transfer type meter . Specialty Gas is a huge industry which requires accurate mass flow meters but also at an affordable price. Applications might include for example the need for a reliable nitrogen , argon  or Hydrogen flow meter.  In the case of hazardous gas, the manufacturers have certain models which are approved for use in certain gas groups.

The industry is also adopting the thermal mass meter into stack gas flow applications and even digester flow regimes which require the thermal mass meter to measure methane mixtures. One of the components in that kind of flow measurement is carbon dioxide and the metering is necessary for those involved in Biogas with concerns of meeting government mandates requiring emission monitoring and so the thermal mass flow meter may be a key element in a design following environmental engineering standards .

The thermal mass flowmeter is also very useful to those in the incineration business or some form of combustion control. Whatever control system is being implemented, there are large volumes or mass of gas involved – these could involve the need for a thermal type natural gas flow meter, oxygen flowmeter or general air flow control for optimization of the plant combustion processes where ratio control is critical to profitability levels and avoidance of energy wastage. Coming back to the ability of the thermal mass flow meter to measure methane /carbon dioxide mixes – this is going to be an excellent choice for applications that have to deal with land fill gas.