- Model 241 VTP - Insertion Multivariable Mass Flow Meter

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A unique insertion multivariable vortex mass flow meter, the Model 241 is a true workhorse in large pipe applications, high pressure applications and numerous geothermal steam applications.

Our  Model 241 provides a direct reading of mass flow rate from a single entry point in the process line and provides analog and digital outputs of five process variables: mass flow rate, volumetric flow rate, temperature, pressure, and fluid density. The unique insertion design has probe lengths from 2-inches up to 72-inches and can measure air up to 67000 scfm and saturated steam up to 330,000 pounds/hour.  In addition, the instrument  is available in a high-pressure version capable of mass flow measurement of gases up to 5000 psig. The Model 241 has emerged recently as the proven instrument of choice in geothermal steam applications across the globe.  The ability to sense all process conditions in a single location greatly improves measurement accuracy and eliminates the costly requirement for additional line penetrations associated with traditional mass flow measurement systems.

Our digital communications solutions offer engineers and systems integrators, full industrial system integration and networking capability with Sierra's vortex flow meters.  Digital communications solutions include: BACnet, HART, and 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. 

Article: Read geothermal steam article: 'Re-Energizing California' , Processing Magazine, November 2007.  Article: Real World Solutions: Geothermal Plant Improves Efficiency with Vortex Meter, Flow Control Magazine, June 2004

The sophisticated on-board flow computer also incorporates AGA-8 algorithms for natural gas measurement to reducing billing and contract disputes. Smart electronics provide access to all measured variables and programming menus, and permit field-configuration directly from the control panel or workstation via RS485, MODBUS or HART protocols.

Product accuracy is ± 1.5% of rate for liquids and 2% of rate for gases and steam over a 30:1 range.  The Model 241 is hazardous area approved for FM, CSA, ATEX and CE.

  • Mass &Volumetric flow monitoring of most gases, liquids and steam
  • Rangeable down to Reynold's number of 5000
  • In-line sizes from 2 ' to 72 '
  • 1.2% rate accuracy (liquids) or 1.5% for gases over a 30:1 turndown
  • Fully field configurable
  • Loop powered with 4-20ma outpute
  • No moving parts, very reliable
  • Also measures pressure, temperature and density of process
  • Ex approved for FM, CSA and ATEX
  • Active loop, Loop powered, MODBUS and HART output available
  • Active Flow profile compensation
  • Fully field configurable
  • Easy to Install, lots of installation options (f.i. Hot-tap systems)

Sierra Instruments' Innova-Mass Multivariable mass vortex flow meter provides a reading of up to five process parameters from a single entry point in the pipeline. The meter can measure the fluid's velocity, temperature, and pressure and calculate mass flow rate, volumetric flow rate and density. Sensing all process parameters at a single location in one integrated meter greatly improves measurement accuracy and reduces total installed cost.

The Innova-Mass Model 240 in-line meters are available in 0.5, 0.75, 1, 1.5, 2, 3, 4, 6 and 8-inch sizes with ANSI or DN16 flanges or wafer flow bodies. The Series 241 insertion meters can be used on pipe sizes from two inches and greater. Optional “hot-tap” hardware including packing gland probe seal, retractor, and isolation valves is also available.

Repeatability
Mass Flow Rate . . . . . +/- 0.2% of reading
Volumetric Flow Rate . +/- 0.1% of reading
Temperature . . . . . . . +/- 0.2° F (+/- 0.1° C)
Pressure . . . . . . . . . . +/- 0.05% of full scale
Density . . . . . . . . . . . +/- 0.1% of reading

Stability Over 12 Months
Mass Flow Rate . . . . . +/- 0.2% of reading maximum
Volumetric Flow Rate . Negligible error
Temperature . . . . . . . +/- 0.1° F (+/- 0.5° C) maximum
Pressure . . . . . . . . . . +/- 0.1% of full scale maximum
Density . . . . . . . . . . . +/- 0.1% of reading maximum

Response Time
Adjustable from 1 to 100 seconds

Material Compatibility
240 . . . . . . . . . . . . . . Any gas, liquid or steam compatible with 316L stainless steel, C276 Hastalloy or A105 carbon steel. Not recommended for multi-phase fluids.
241 . . . . . . . . . . . . . . Any gas, liquid or steam compatible with 316L stainless steel. Not recommended for multi-phase fluids.

Flow Rates
Typical mass flow ranges are given in the following table. Precise flow ranges depend on the fluid and pipe size. 241 insertion meters are applicable to pipe sizes from 2-inch and greater. Consult factory for sizing program.

Linear Range
Smart electronics corrects for lower flow down to a Reynolds number of 5,000. The Reynolds number is calculated using the fluid’s actual temperature and pressure monitored by the meter. Rangeability depends on the fluid, process connections and pipe size. Consult factory for your application. Velocity rangeability under ideal conditions is as follows:
Liquids 30:1 . . . . . . . 1 foot per second velocity minimum
30 feet per second velocity maximum
Gases 30:1 . . . . . . . . 10 feet per second velocity minimum
300 feet per second velocity maximum

Power Requirements
12 to 36 VDC, 100 mA (add 20mA per output up to 60mA)
100 to 240 VAC, 50/60 Hz, 25 watts

Display
Alphanumeric 2 x 16 LCD digital display
Six push buttons switches (up, down, right, left, enter, exit) operable through the display glass of the explosion-proof enclosure Viewing at 90° mounting intervals

Process Fluid & Ambient Temperature
Process Fluid . . . . . . . Standard Temperature Sensor:
-40°F to 460°F (-40° to 260°C)
High Temperature Sensor:
-40°F to 750°F (40° to 400°C)
Ambient . . . . . . . . . . Operating: -5°F to 140°F (–20° to 60°C)
Storage: –40°F to 150°F (–40° to 65°C)
0-98% relative humidity, non-condensing conditions

Output Signals(1)
Analog . . . . . . . . . . . . One to three field rangeable, simultaneous linear 4-20 mA output signals (1000 ohms maximum loop resistance) selected by user from the five parameters—mass flow rate, volumetric flow rate, temperature, pressure and density
Pulse . . . . . . . . . . . . . Pulse output for totalization is a 50-millisecond duration pulse operating a solid-state relay capable of switching 40 VDC, 40 mA maximum HART standard , Optional MODBUS RTU.

Alarms
Up to three programmable solid-state relays for high, low or window alarms capable of switching 40 VDC, 40 mA maximum

Totalizer
Based on user-determined flow units, nine full digits, with rollover at 4, 294, 967, 295. Total stored in non-volatile memory

Wetted Materials
240 . . . . . . . . . . . . . . 316L stainless steel standard C276 hastalloy or A105 carbon steel optional Teflon-based thread sealant on pressure transducer
241 . . . . . . . . . . . . . . 316L stainless steel Teflon packing gland below 500°F (260°C) Graphite packing gland above 500°F (260°C)
Teflon-based thread sealant on pressure transducer

Enclosure
NEMA 4x/7 (IP65) cast enclosure

Electrical Ports
Two 3/4-inch female NPT ports

Mounting Connections
240 . . . . . . . . . . . . . . Wafer or 150, 300, 600 lb ANSI flange
241 . . . . . . . . . . . . . . Permanent Installation: Two inch Male NPT; 150, 300, 600 lb ANSI flange with compression fitting probe seal
Hot Tap(1) Installation: Two inch Male NPT; 150, 300, 600 lb ANSI flange; and optional retractor with packing gland probe seal

Mounting Position
240 . . . . . . . . . . . . . . No effect
241 . . . . . . . . . . . . . . Meter must be perpendicular within +/- 5° of the pipe centerline

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