VTER Air-Cooled Probes
VTER System - US Recovery Boiler
Six-Probe VTER Electronics
VTEC Probe System
Air Cooled Coupon Probe
VTER Probe Systems
Variable Temperature Electrical Resistance (VTER) systems monitor the electrical resistance of a corroding elements mounted at the end of temperature-controlled probes, enabling corrosion rates to be calculated. The technology is suitable for both short or long term monitoring of corrosion rates in industrial and boiler plant.
Air cooling is used to control the temperature of the corroding element mounted at the probe end; the elements themselves can be a variety of shapes and thicknesses, and includes tubular geometries. As the elements thin due to corrosion/erosion, the measured electrical resistance increases.
The VTER measurement electronics are exteremely sensitive and are able to detect resistance changes as small as 50ppm (0.005%) under laboraory conditions. A single VTER systems is able to control up to six air-cooled probes.
These systems formed the foundations for the development of our electrical resistance scanner technology.
Click here for our VTER systems brochure.
VTEC Probe Systems
Designed for aqueous environments, these Variable Temperature Electrochemical system (VTEC) systems use a three electrode element which may be air cooled to the same temperature as surrounding surfaces.
VTEC systems are suitable for applications where rapid response takes priority over absolute corrosion rate measurements and monitor the electrochemical signals produced by the corrosion processes in aqueous conditions.
A Linear Polarisation Resistance Monitor (LPRM) is used to monitor corrosion rates and can be interfaced to a dedicated data logger or plant information systems as required.
VTC Probes
Variable Temperature Coupon (VTC) probe systems provide accurate corrosion rates together with morphological information at a low cost. These cumulative exposure probes are weighed before and after exposure to yield total metal loss information. We can supply a range of tubular and flush fitting probes to suit the particular application.
Probe Temperature Control Systems
All the above probes incorporate proportional temperature control facilities to air-cool the elements or coupons to better than ± 1ºC.
Further Reading (VTER technology)
On-Line Monitoring of Furnace Wall and Superheater Corrosion in Power Generation Boilers
D.M.Farrell, B.J.Robbins, VTER Technical Paper, Corrosion Science Symposium,1998. (PDF File 0.4 MBytes)
