OnGuard Corrosion Monitor

The Purafil OnGuard® Smart (OGS) Atmospheric Corrosion Monitor indicates the level of corrosion before severe damage occurs, preventing costly downtime and maintenance repairs. The OnGuard’s copper and silver sensors measure the rate of corrosion in real-time. An internal data logger stores the results to be accessed through the internet or directly transmit to a process control system. The latest generation of OnGuard monitors now includes a room pressure sensor.

Features:

• Tracks peaks and trends to determine the level of corrosion

• Measures temperature, relative humidity, and room pressure

• Low maintenance: Sensors remain reliable until reaching 4000 Angstroms of cumulative corrosion

• Direct interface provided by the backlit LCD and keypad

• Remote power from network cable (PoE)

• 4-20mA connection for existing facility management systems or distributed control systems (DCS)

• Accurate within ± 1% of full span

Benefits:

• Indicates the level of corrosion before damage occurs, preventing costly repairs/downtime

• Ethernet enabled

• Easy remote access to data and graphs

• RoHS compliant

• 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 71.04-2013

Principle of Operation: The OGS comes with two quartz crystal microbalance (QCM) sensors, one that is plated with copper and another 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.