VW Crackmeters

Overview

The Model 4420 Crackmeter is intended to measure movement across surface cracks and joints. It is installed by grouting, bolting, or bonding two threaded anchors (with ball joints) on opposite sides of the crack and then attaching the ends of the gage to the anchors.

Specifications

Standard Range¹ 12.5, 25, 50, 100, 150 mm
Resolution 0.025% F.S.
Accuracy² ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range¹ −20°C to +80°C
Lengths³ 318, 343, 397, 559, 649 mm (transducer)
Diameter 8 mm (shaft) / 25 mm (coil)

¹Other ranges available on request.
²Accuracy established under laboratory conditions.
²Length dimensions are in mid-range position.