Kavlico has an enviable pedigree of many years supplying position feedback for power turbine applications to the oil and gas industry, worldwide.  These are units that perform day in and day out in harsh environments for many years.  The key advantages of Kavlico products are a non-contacting design and rugged construction. Kavlico certifications include intrinsically safe designs that can be used in the dangerous vapor environments found in the oil and gas industry where the need for safety is paramount.
Kavlico also repairs existing hardware here
LVDT