Air / Gas Thermal Insertion Mass Flow Meters

Feature

640i VT Thermal Insertion Mass Flow Meter; all 316L stainless steel construction; linear 4-20 mA output signals for Mass Flow Velocity and Temperature, temperatures -40°F to 392°F (-40°C to 200°C); pressure to 500 psig (34.5 barg); standard accuracy (air) +/- 0.75% of reading above 50% of full scale flow and +/- 0.75% of reading plus 0.5% of full scale below 50% of full scale flow; includes qTherm™ Electronics with PC configuration software; 24 VDC +/- 10.0% or 100-240 VAC input power with a 3/4-inch (2 cm) diameter 316 SS insertion sensor probe; configurable alarm and pulse outputs; CE, cFMus, ATEX, IECEx approved

640i VTP Add a pressure output to the 640i VT version; three 4-20 mA linear outputs for mass flow velocity, temperature, and pressure; includes pressure sensor to 500 psia (34.5 bara)

Specifications

• Accuracy: +/- 0.75% of reading above 50% of full scale*
• Repeatability: +/- 0.15% of full scale 
• Flow range 0 to 60,000 sfpm (0 to 305 smps) 
• Turndown 100:1
• 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
• Gas Temperature: -40°F to 392°F (-40°C to 200°C)
• Ambient temperature: -40°F to 140°F (-40°C to 60°C) / ATEX/IECEx Versions -4°F to 140°F (-20°C to 60°C)
• 1-inch (25.4 mm) diameter protective sensor shield option for improved sensor protection.
• Response time is three seconds to achieve 63% (one time constant) of final value
• Power supply: 100 to 240 VAC (0.4 Amps RMS at 230 VAC); 24 VDC +/- 10%, 1 Amp
• 316 stainless steel construction
• Output signals: RS-232, 4 to 20 mA flow, 4 to 20 mA temperature, 4 to 20 mA pressure (optional)
• Alarm output (contact SPST/opto relays)
• User definable pulse output for totalized flow
• Digital communications:  HART and Modbus RTU
• Hazardous-Area Location Enclosure (IP66)
• Approvals:
  • cFMus–Explosion proof for Class I, Div I, Groups B,C,D
  • ATEX
  • IECEx
  • GOST R
  • Chinese Pattern
  • CE–European Conformity

*Verified by an independent NIST & NVLAP accredited lab