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Helium Mass Spectrometer: VIC Leak Detection .

Finding Leaks Slowing You Down?

The MD-490S is a leader among portable helium leak detectors.  With a response time less than 0.5 seconds, sensitivity to 10 -8 direct reading Atm-cc/sec, and the ability to zero-out background, this is the most aggressive portable leak detector in the industry with advanced features designed specifically for industrial use.

Check out these features:

  • NEW Vibra-Leakô Probe (patent pending) with background suppression button provides tactile feedback when leak rate exceeds the reject set point; ideally suited for noisy environments where audio alarms cannot be heard or where leak detectors are in close proximity; Vibra-Leakô Probe solves background helium problems during the test.
  • NEW Helium background suppression ; With a push of a button, the MD-490S eliminates the background.
  • NEW Most sensitive sniffer available with a 10 -8 sensing capabilities through enhanced helium collector design and signal processing.
  • Fully interactive system diagnostics include critical parameters such as run times, operating voltages/currents and pressures.
  • Graphical and numerical displays of leak rate values.
  • Sealed membrane keypad for long life in harsh environments.
  • Fully automatic calibration sequence with built-in 10 -5 ATM-cc/sec gas leak prompts operator to insert probe into the built-in leak and adjusts the machine's leak rate reading to match the leak value; The built-in calibrated leak is traceable to the National Institute of Standards and Technology and is provided with certification.
  • Dry (oil-free) vacuum pumping minimizes maintenance and potential oil contamination problems.
  • Probe blockage alarm ensures proper system performance.
  • Front panel key lock-out prevents unauthorized users.
  • High output (110db Adjustable audio alarm.
  • Alphanumeric Prompting Display (multilingual): The MD-490S is fully interactive; It is the only portable helium leak detector that keeps you continuously informed of the process with a multilingual alphanumeric prompting display that uses words rather than icons for more accurate communication.
  • Built-in Calibrated Gas Leak is accessible through side panel door;  The calibrated gas leak is designed to allow direct reading of leak rates in atmospheric conditions.


  • Sensitivity- Smallest detectable helium leak rate 5 x 10 - 8 ATM-cc/sec. helium (Atmospheric sniffer mode).
  • Response Time- Approximately 0.5 seconds.
  • Leak Rate Range- 10 -3 to 10 - 8 ATM-cc/sec. direct reading of helium leak rate (compensated for atmospheric sampling).
  • Start-up Time- Less than 3 minutes, one button automatic operation.


  • Console-Microprocessor based electronics, incorporating 40 character alphanumeric prompting display.  Fully automatic operation including start-up, shutdown, leak rate ranging, automatic zero and diagnostics including operating and runtime parameters.  Contains 40 segment leak rate indicator and operator function buttons.

Mass Spectrometer
Miniaturized 90° deflection, fixed magnet design. All stainless steel construction. NW-40 flange for high vacuum connection. Utilizes two non-burnout thoria coated iridium filaments.

Vacuum System

  • Pumps:  Dry (oil-free) built-in diaphragm, fore-pump and 70-liter/second air-cooled molecular drag pump.
  • Inlet System: Interstage design incorporating integral mass separator high flow atmospheric inlet.  Standard sniffer probe hose length 10'.  Other lengths available on request.
  • Calibrated Leak: 150-cc high pressure cylinder with low volume stainless steel leak element.  Traceable to N.I.S.T with calibration certificate supplied.  Easily removable for re-calibration.
  • Pressure Measurement: Probe blocked sensor (10 -3 Torr).  Turbopump speed characteristics for high vacuum (10 -6 Torr).

Power Requirements
115/220 Volts, 60/50 Hz, 6/3 Amps; CE Compliant.

Interested in this product? Click Here for more information

Sales@ElectrolabInc.com | 440 Lawrence Bell Drive, Suite 2 | Buffalo, NY 14221 | Tel: 716-833-4457 | Fax: 716-833-8316