Real-Time Corrosion Monitor: OnGuard SMART

Real-Time Corrosion Monitor: OnGuard SMART

The Purafil OnGuard Smart(OGS) Atmospheric Corrosion Monitor indicates the level of corrosion before severe damage occurs, preventing costly downtime and maintenance repairs. Reactivity monitoring is an accurate and reliable method of evaluating the quality of air, characterizing the room environment and evaluating the effectiveness of chemical filters. The OGS's copper and silver sensors measure the rate of corrosion in real-time. An internal data logger stores the results to access through the internet or directly transmits to a process control system. The latest generation of OnGuard monitors now includes a room pressure sensor, and Wi-Fi capabilities. Ideal for control rooms, server rooms, motor control centers, rack rooms or other areas where corrosion is a concern, the OG4 allows action to be taken before problems develop.

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  • Indicates the level of Corrosion before severe damage occurs, preventing costly repairs/downtime
  • Ethernet and Wi-Fi enabled
  • Easy remote access to data and graphs
  • Measures Corrosion, Room Air Pressure, Temperature and Relative Humidity on a continuous basis.
  • Provides incremental and cumulative corrosion data
  • Easy to install
  • Long service life
  • Readings correspond to ISA Standard S71.04.2013
  • RoHS compliant.


  • Tracks peaks and trends to determine the level of corrosion.
  • Measures corrosion, room pressure, temperature and relative humidity.
  • Low Maintenance: Sensors need replacement at 4000 Angstroms of cumulative corrosion growth
  • Remote power from network cable (PoE)
  • AA battery-powered for remote or inaccessible areas.
  • Accurate within + 1% of full span.
  • Accurate within + 1% of full span.

Principle of Operation

The OGS comes with two quartz crystal microbalance (QCM) sensors, one that is plated with copper and anoth¬er with silver. The QCM is used to measure the corrosive film that results from the environment. This highly sensitive method of measurement will indicate contaminant levels at or less than one part per billion (1 ppb). The corrosion film thickness is measured and recorded in Angstroms (Å). This measurement corresponds directly to ISA Standard S71.04-2013.


Severity Level

Copper Corrosion

Silver Corrosion

G1 - Mild

<300 Angstroms / 30 days

<200 Angstroms / 30 days

G2 - Moderate

<1000 Angstroms / 30 days

<1000 Angstroms / 30 days

G3 - Harsh

<2000 Angstroms / 30 days

<2000 Angstroms / 30 days

GX - Severe

>2000 Angstroms / 30 days

>2000 Angstroms / 30 days

Connectivity Benefits:

  • Uses Simple Network Management Protocols (SNMP)
  • Connect using any device with a web browser
  • Communicate via local network and remotely over internet
  • Capable of wireless connectivity
  • Enable email alerts for alarm thresholds


Industrial: Pulp & Paper Manufacturing, Oil Refineries
Precision Air: Data Centers, Semi-Conductor
GLAM: Galleries, Libraries, Archives, Museums

Location Requirements:
Install in a controlled environment between -10° and 75° C