CORROSOMETER® 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.
CORROSOMETER® instruments directly measure the metal loss on CORROSOMETER® 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 CORROSOMETER® probes to match various applications. The major probe categories are as follows.
- Internal process monitoring probes
- Removable under system pressure
- Non-removable under system pressure
- Laboratory probes
- External and structural monitoring probes
- Environmental monitoring probes
In general the CORROSOMETER® 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. Details are given on the data sheet for each model probe.
Internal Process Monitoring Probes Removable Under System Pressure
Probes that are removable under system pressure are particularly useful to enable inspection or change out of probes without shutting down or isolating the system. Two systems are available depending on the pressure.
- RETRACTABLE SYSTEM for pressures up to 1,500 psi.
- RETRIEVABLE SYSTEM for pressures up to 3,600 psi and 6,000 psi.
RETRACTABLE process 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 probes at pressures too high to permit safe operation by hand (above 150 psi requires over 50 lb. Insertion force).
RETRIEVABLE process 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.
Internal Process Monitoring Probes Fixed Type (Non-removable under system pressure)
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.
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