Portable Helium/Hydrogen Sniffing Leak Detector

MD-490S Dual Gas is the most advanced sniffing Helium/Hydrogen leak detector designed specifically for industrial environments. The MD-490S Dual Gas utilizes VIC’s own industrial-grade mass spectrometer to achieve the highest sensitivity, fastest response-time, and smallest footprint.  This unit is available in hydrogen only or helium and hydrogen models.


Sensitivity 1 x 10-7 atm/cc/sec; smallest detectable leak rate 5 x 10-7 atm/cc/sec
Leak rate Range 10-3 through 10-7 atm/cc/sec
Start up time < 3 mins
Response time < 0.5 seconds
Fully automatic start-up, shutdown, leak rate changing, automatic zero, and diagnostics
Diagnostics operating and runtime parameters; 40 segment leak rate indicator and operator function buttons
Mass Spectrometer miniaturized 90 degree deflection, fixed magnet design; stainless steel construction; MW-40 flange for high vacuum connection; two thoria coated iridium filaments
Vacuum System

Pumps are .5 cfm mechanical rotary vane 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 feet; other lengths available.

Calibrated Leak

150cc high pressure cylinder with low volume stainless steel leak element; traceable to N.I.S.T. with calibration certificate supplied. Easy to remove for recalibration.

Pressure Measurement

Probe blocked sensor 10-3 Torr; Turbopump speed characteristics fro high vacuum 10-6 Torr

Multilingual Alphanumeric Prompting Display  
Optional Vibra-Leak Probe  
Available RS-232 Interface  
Optional Remote Display  
Available PLC Interface  
Available Analog Interface  
Available Spanish Prompts  
Power 115/220 Volts AC, 60/50 Hz, 6/3 Amps CE compliant
Weight 70 pounds
Dimensions 13 9/16″ W x 15 9/16″ H x 24 5/16″D
Engineering To Approved Solutions Vacuum Instruments Corporation, LLC custom engineers to Approved application specifications; Email An Engineer  your leak testing application requirements and specifications to us.


MD-490S Dual Gas

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