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  AC-Operated,
Short-StrokeSpring-Extended Armature |
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"PSE" Precision LVDT Series (AC) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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NOTE: Some of the AC "PSE" Series LVDT's have retained their "classic" Daytronic model numbers. These AC units present the optimum combination of range, accuracy, versatility, and small size required for general-purpose applications. A SPRING-EXTENDED ARMATURE and a special linear bearing technique yield virtually friction-free probe action over a wide temperature range. With suitable signal conditioning equipment, they can provide repeatability of well within a micron (0.001 mm). These LVDT's are a logical selection when ambient temperature control is impossible or inconvenient, since small size and AISI-446 stainless-steel construction normally reduce thermal expansion errors to insignificance. (Temperature errors attributable to the transducer-instrument combination amount to less than one microinch per °F. This is smaller than the errors that inevitably arise—even in the most well designed fixture systems—from ordinary thermal expansion and contraction. In general, dimensional measurement with meaningful precision to 0.0001" or better demands a carefully controlled temperature environment.) In addition to high mechanical strength, all models have fully encapsulated, magnetically shielded windings for use with ESI or other carrier amplifier equipment. (Differential-inductance windings are also available, for use with equipment with half-bridge input circuitry.) They can be mounted in any position, and are unaffected by being clamped into the steel housings of most gaging fixtures. With a built-in "anti-rotate" mechanism, each ball-ended probe can withstand the high side loads often encountered in multipoint gaging operations, without loss of accuracy. For a convenient means of applying accurately known input for initial "PSE" LVDT calibration, see the Model 115C Calibration Kit. For special "PSE" versions featuring high repeatability and linearity, see the AC "PSEG" Precision LVDT Series. For hermetically sealed versions, see the AC "SEM" LVDT Series. General Specifications are given below.
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