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Standard Electrical Resistance (ER)

Electrical Resistance (ER) probes and instruments determine metal loss from corrosion or erosion by the electrical resistance method. This method may be used in virtually any environment except liquid metals or some conductive molten salts.

ER instruments directly measure the metal loss on ER probes. Plotting metal loss as a function of time permits corrosion rate to be determined. The slope of the curve represents the average corrosion rate over the selected interval. There are a wide variety of ER probes to match various applications. 

In general the ER probes have sensing elements made of the metal or alloy for which corrosion data is required. The probe bodies may be of the same alloy, but thicker, or of a higher, less corrosive alloy. 

For information on helping you select a ER Probe for your application see our ER Probe ER Selection Guide.

Fixed
Fixed
Fixed electrical resistance (ER) probes which are not removable under system pressure are sometimes used for reasons of economy or special process limitations. These may be mounted with a flange or NPT threaded connection. NPT connections are available with fixed or adjustable length.
Retractable
Retractable
Retractable process electrical resistance (ER) probes are introduced into the system through a stuffing box mounted external to a valve. A specially-designed retracting device is available for insertion or removal of electrical resistance (ER) probes at pressures too high to ... [more]
Retrievable
Retrievable
Retrievable process electrical resistance (ER) probes are sealed into the system in a Cosasco access fitting. A separate Cosasco service valve and retriever is used for insertion and removal of the probes under system pressures.
Underground
Underground
Underground electrical resistance (ER) probes are designed for underground and structural monitoring of pipelines, vessels, above and below ground storage tanks and structures — whether cathodically protected or not. The Model 620HD is a heavy duty assembly with a check element ... [more]
Atmospheric
Atmospheric
Atmospheric Corrosion electrical resistance (ER) probes monitor the corrosivity of the air in plant control rooms, in motor control centers, near exhaust stacks and in other environmental monitoring applications. They are available in two ranges with spans of 250Å and 2500Å. ... [more]
Accessories
Accessories
Electrical Resistance (ER) and ER Temperature probes are designed for safe installation and operation in various environments. Certain accessories are required based on pressure, temperature, etc., including probe element shields, retractable probe safety clamps, intrinsic safety ... [more]
Downhole
Downhole
The DCMS Downhole Corrosion Monitoring System provides continuous corrosion history of downhole tubing using eletrical resistance (ER) measurement technology. The DCMS™ tool is another Cosasco innovation, and the only tool available which provides recorded corrosion and temperature data for ... [more]
 

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