The Vehicle Mass Analysis System (VMAS) measures exhaust mass using a reliable, accurate and low cost method in both centralized and de-centralized inspection and maintenance programs.

Download VMAS Brochure
Request a Quote


VMAS: Vehicle Mass Analysis System

The VMAS uses an innovative technique for measuring exhaust volume. This technique, coupled with current low cost NDIR gas analyzers, provides for a highly accurate and repeatable mass measurement system suitable for transient, steady state, and even idle test procedures.

  • Features
  • Specifications
  • Low cost
  • Accurate and repeatable

Storage temperature: -20°C to 55°C
Correlation: IM240 @ R2 ~ 0.99
Sample rate: 1 Hz
Operating temperature: 5
Operating pressure: 800 - 1100 mbar
Relative humidity: 0 - 90% RH, non-condensing
Measurement Resolution
Grams Hexane: 10 µg/second
Grams CO: 100 µg/second
Grams CO2: 1000 µg/second
Grams NOx: 10 µg/second
Flow Meter SubSystem
Range: 150 to 500 SCFM (calibration dependent)
Accuracy: ± 15 SCFM
Resolution: 1 SCFM
Response time: T90 < 30 seconds
Oxygen SubSytem
Range: 0.30 to 22.5% O2
Accuracy: ± 0.3% O2 SCFM
Resolution: 0.1% O2
Drift long term: ± 10% over 3 years
Response time: T90 < 1.2 seconds
Power input: 90 - 260 VAC, 50/60 Hz
Power output: +12VDC, +5VDC