MSA TruCal Gas Calibration Technology

Don’t ignore the hidden costs of gas detection. Gas detection is often viewed as a necessary capital expense. However, the long term operational costs such as labor and calibration gas shouldn’t be overlooked.

MSA's breakthrough TruCal is a patented extended calibration technology that corrects sensor drift and extends calibration periods for XCell Hydrogen Sulfide (H2S) and Carbon Monoxide (CO) gas sensors using Adaptive Environmental Compensation (AEC) algorithms.

Request a TruCal cost of ownership consultation to find out how much you can save.

Sensor Diffusion

Diffusion Supervision–Active Technology

Not only does TruCal compensate for environmental changes, it will let you know if the sensor inlet gets blocked using Diffusion Supervision technology. Diffusion Supervision employs proprietary acoustic mechanical design and algorithms to measure sound across the sensor's inlet. If the inlet is blocked with a material, like ice, the difference in the sound is detected and the unit is put into fault. When the obstruction is removed, Diffusion Supervision detects the clearance and returns to normal.

You'll achieve greater peace of mind knowing that TruCal's self-checking technology will let you know if gas can't reach the sensor. No more surprises when you go to calibrate the sensor only to find that it's been blocked for an unknown period of time. TruCal proactively self-checks every six hours!

TruCal saves time and money by doing the hard work for you

Extend Calibration Intervals

Up to 24 months

Validated Performance

Know that the sensor works between calibrations

Automated Pulse Checks

Defined calibration periods are a thing of the past

Proactive Self-Checks

per day

Active Correction


  • Adjusts sensor readings due to environmental factors
  • Compensates for maturing sensor performance


Automatic Notifications


  • If sensor opening becomes blocked
  • When calibration is required
  • Sensor end-of-life is near


Found exclusively on the ULTIMA X5000 and General Monitors S5000 gas monitors

ULTIMA X5000 gas monitor
XCell gas sensor logo
General Monitors S5000 gas monitor

Available Downloads

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