Corrosion Monitoring
No corrosion control program is complete without a corrosion monitoring system. Corrosion monitoring is an accurate and reliable method of evaluating air quality in a controlled environment. Corrosion monitoring involves installation of ISA-71.04 Coupon that accumulates corrosion over a time period.
ISA-71.04 Coupon
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ISA-71.04 Coupon provides a direct, quantitative measure of the overall corrosion potential of an environment. ISA-71.04 Coupon allows the customer to assess indoor air quality as well as evaluate the performance of the gas phase filtration systems in post installation tests. It does not require any electrical connection or calibration, and is very simple to use and typically placed in the environment for 30 days. ISA-71.04 Coupon functions by reacting with contaminants to form a corrosion film. Analysis of the corrosion film that forms on the coupon provides an excellent indication of the type and amount of gaseous contaminations present in the environment. Based on the results the environment is classified as G1, G2, G3 and Gx as per ISA 71.04 – 2013 classifications. The results are then used to design an optimal gas phase filtration system. |
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Typical ISA-71.04 Coupon Installation Sites
Industrial and Mission Critical Environments
- • Control rooms
- • Motor control centers
- • Data Centers
- • Critical parts storage rooms
Museum and Library Environments
- • Outside air intakes
- • Recirculation air handlers
- • Storage rooms
- • Display cases
- • Archives
- • Historic Houses
ECM Environmental Condition Monitor
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The ECM™ is a multiparameter monitoring system providing constant surveillance of the environment and rapid detection of any deterioration that could result in damage to expensive equipment and valuable assets. Early detection of humid, high temperature, or corrosive conditions will permit corrective action to be taken before substantial damage occurs to sensitive computer and instrumentation systems or electrical equipments. The system measures humidity, temperature, and the corrosive attack on two replaceable thin-film sensors. The corrosion rate is shown by indicator lights that correspond to the ISA classification of environments (G1 through GX) for copper and silver. Analog and/or digital outputs of corrosion, humidity and temperature information provides remote alarming, display and recording. The information may also be stored in the on-board data-logger, and accessed via PC software. The system can also be used as a high- sensitivity corrosion monitor for special applications. The ECM™ is particularly useful for environmental monitoring in refineries, chemical plants, pulp and paper plants, control rooms, computer rooms, museums, and clean rooms. |
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Specifications
Measured Parameters
- • Corrosion: Two independent channels
- • Corrosion Rate: Rate time period user selectable: 1-99 hrs.
- • ISA Classification: G1 through GX
- • Temperature: +32° F to +122° F or 0° C to +50° C
- • Humidity: 10% to 95% RH
- • Differential Pressure: Optional differential pressure transmitter, 0-2 inches or 0-50 mm (H₂O) standard
Sensors
2,500 Å nominal span (life). One copper and one silver provided with instrument. Other materials available by special order.
Displays
LCD display of corrosion and corrosion rate for each channel, humidity, temperature, and room loss differential pressure. LED indicators corresponding to ISA environmental classifications.
Alarms
Corrosion rate (2 channels), low temperature, high temperature, low RH, high RH, differential pressure, ISA environmental classification (2 channels).
Outputs
• Analog: Five 4-20 mA outputs (current sinking or current sourcing) user assignable to desired parameters.
• Digital: RS-232 or RS-485 serial output of all nine measured and calculated parameters. Multiple units can be connected on RS485 multidrop (daisy c
Datalogging
Internal datalogger accessed by software direct from PC.
Power Requirements
24 VDC, 0.4 amps.
Operating Temperature Range
+32° F to +122° F or 0° C to +50° C
