The new FlexStream™ automated Perm Tube System offers total flexibility for creating precision gas mixtures. Mixtures are produced by diluting the miniscule flow emitted from Trace Source™ permeation (or diffusion) tubes with a much larger flow of inert matrix gas, typically nitrogen or zero air. The FlexStream™ is ideally suited for creating trace concentration – ppm, ppb, and pptr – mixtures. The FlexStream™ Base Permeation Unit is small, easily transportable and easily combined with other FlexStream™ modules to form integrated gas mixing systems.

Temperature Control Range: : 5 ºC above ambient from 20 to 150 ºC (heat only)
Temperature Display Resolution: 0.01 ºC on front panel touch screen
Standard Flow Range: 0.25-5.0 liter per minute
Optional Flow Ranges: 0.1-0.5, 0.1-1.0, 0.5-10.0 lpm
Flow Control over Calibrated Range: ≤ ±1.5 % of reading
Flow Change - 0 to Full Scale: < 10 sec (2 time constants) at ambient pressure
Calibration: Internal Source Zero and Scale
• Mode Change - Zero at 1 lpm to Span at 1 lpm: < 5 sec (2 time constants) at ambient pressure
Output Concentration Range: below 1 ppb to over 1000 ppm depending on emission rate and dilution flow rate
Local Interface: color touch screen display with virtual keypad
Remote Interfaces:
Communication Protocol: : Modbus RTU
Power Req: Standard: 115 VAC, 50/60Hz, 2 A
Power Requirements: Optional (specified at time of purchase): 230 VAC, 50/60Hz, 1 A
Dimensions: 6 inch Width x 13.5 inch Height x 20 inch Depth (add 3.5 inch to Depth for front panel inlet filter clearance)
Weight: Approximately 30 lbs


  • Complete, integrated, ready-to-use turnkey system
  • Automated operation with direct readout of concentration TECHNICAL
  • Benefits in units of ppm, ppb or ppt
  • Modes of Operation: standby, zero, span and purge
  • Touch-screen interface for local setup and manual control
  • Modbus connectivity for integration with existing systems
  • Flow path designed for maximum flexibility with minimum error
  • Flow path suitable for reactive gases - mixture
  • contacts only glass, Teflon® and stainless steel (other materials available)
  • Accepts disposable permeation tubes, diffusion tubes, ultra-high rate liquid filled tubes, wafer tubes, and prefilled gas fed permeation tubes
  • Accepts up to 8 disposable tubes with maximum 6 inch length x 1/4 inch diameter (KIN-TEK HRT, SRT and EL tubes)
  • Accepts one of KIN-TEK refillable LFH, ULED and 57 Series tubes