A Traverse unit measures distance in increments of 0.01" on a scale graduated in divisions of 0.1" with a vernier. Standard scale lengths are 6", 12", 18", 24", 30", 36", 25cm, 50cm, 75cm, 100cm, but other lengths can be custom manufactured.
Linear movement is resisted by the friction of flat springs sliding on the scale, adjustable by a thumb screw which can be tightened to lock the probe at any location.
Angle of rotation of the probe, used for measuring flow direction, is measured in movements of 0.2° over a full 360° on a protractor graduated in 2° divisions for easy readability and a special large scale vernier.
Both vernier and protractor are friction loaded with adjustable springs and balls for easy, accurate rotation to any angle. The adjusting spring screw can be tightened by a thumb screw or an Allen wrench to lock the probe at any angle. The vernier is fully adjustable, permitting the zero angle point to be set at any time without loosening the probe in the Collet and losing the distance setting.
The Traverse unit is designed for maximum visibility even under conditions of poor lighting and awkward position. Verniers are designed to eliminate parallax errors and divisions are spaced widely enough so the linear scale can be read accurately to .01". Both scales are easily visible from the same point regardless of rotation of the probe. The flat surface of the scale provides a convenient reference surface for aligning a directional probe with the rig by placing a parallel between aligning block and scale.
Interchangeable Collets take from 1/16" to 3/8" diameter probes and lock them firmly in position without danger of damage to the probe stem.
The unit may be mounted to a flat surface via two 1/4" bolts or to a Tapped Boss combined with a Pressure Seal. With surface mounting a Pressure Seal, which does not extend below the Mounting Plate, may also be provided. In either case, the integral Pressure Seal on Mounting Plate may be exchanged for different size probes.