» ACM – Atmospheric Corrosivity Monitor
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ACM – Atmospheric Corrosivity Monitor


Bry-Air is proud to introduce yet another revolutionizing product, Atmospheric Corrosivity Monitor (ACM), which will enable measure corrosion potential of an enclosed environment with ease and accuracy.

Bry-Air Atmospheric Corrosivity Monitor (ACM) monitors corrosion potential on a real time basis. It measures and monitors the room temperature, relative humidity and optionally, the differential pressure. It provides qualitative and quantitative details of the overall corrosion potential of an environment (room) through copper and silver sensors. It is based on Quartz Crystal Microbalance (QCM) technology, which measures the rate of increase of corroded metal sensors mass. The measurements are extrapolated in 24 hours for 30 days to know the severity level as per ISA standard.

Bry-Air Atmospheric Corrosivity Monitor (ACM) diagnoses the corrosion of an environment according to the ISA Standard 71.04-2013 outlining severity of corrosion from G1 (mild) to GX (severe) environment. Reactivity monitoring can be used to characterise the destructive potential of an environment. Measurement of thickness of corrosion film provides an excellent indication of the type(s) and level(s) of all corrosive gases present in the local environment.

Why do we need to measure atmospheric corrosion and reactivity rate?

Often it is seen that the environmental threats posed by fire, power, temperature, humidity and airborne particulates have long been recognized and successfully addressed in the server-room environment, the corrosive potential of the air has been largely ignored.  Even extremely low levels of contaminant gases at the ppb level corrode and damage the sensitive electronic cards in your servers. Excessive corrosion often leads to electronics warranty non-compliance, circuit board failure, ghost signaling, and even complete failure of electronics components.

Environment with higher atmospheric and air contamination require greater attention to air quality management. The interactive result of temperature variations and humidity with the gaseous contaminants has the potential to increase the threat of air corrosion, providing greater reasons for close monitoring of the immediate environment of IT infrastructure. All companies dealing with sensitive IT infrastructure such as data centers, server room, control rooms, as a core part of its operations, need to implement a comprehensive checking and monitoring mechanism for the corrosion potential of the gases inside their facility. The ISA standards define or characterize environments in terms of their overall corrosion potential.

Environmental Classification as per ISA-71.04.2013 (in Angstrom)

Class Severity Level Cu/ Ag Reactivity
G1 Mild <300Å=Cu
An environment sufficiently well-controlled such that corrosion is not a factor in determining equipment reliability.
G2 Moderate < 1000Å An environment in which the effects of corrosion are measurable and corrosion may be a factor in determining equipment reliability.
G3 Harsh < 2000Å An environment in which there is a high probability that corrosive attack will occur. These harsh levels should prompt further evaluation resulting in environmental controls or specially designed and packaged equipment
GX Severe < 1000Å An environment in which only specially designed & packaged equipped would be expected to survive. Specifications for equipment in this class are a matter of negotiation between user & supplier

Based on the proven Quartz Crystal Micro balance (QCM) technology in which frequency output changes due to change of weight. Stable digital output not prone to drifts or errors and can be easily processed. The unit utilizes copper and silver coated quartz crystal micro balances and monitors the weight gain as a consequence of corrosion built up on the metal surfaces. The weight gain is translated to film thickness and the corresponding corrosion classification level.

Unique Features

  • Accuracy better than 1%
  • Inbuilt temperature & humidity sensor for fluctuations monitoring
  • Loss-free transmission on to existing Building Management Systems (BMS) through digital RS485 port or analogue 4-20 mA output
  • Sensor life up to 4000 Angstroms
  • PC based software for configuration and data
  • Realtime data view and stored in internal memory and SD card
  • Copper and silver sensors
  • Incremental and cumulative corrosion values
  • Differential pressure transmitter input or optional built-in pressure sensor
  • Four programmable 4-20 mA analogue outputs, optional alarm relay outputs
  • USB port for easy connection to any PC or Laptop

ACM model BCM232 monitors the overall reactivity levels of gaseous airborne contaminants present. Reactivity Monitoring provides an exact and dependable way to evaluate the corrosivity potential of indoor air and also the effectiveness of installed filter systems.

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