Humboldt HC-2939 Displacement Crack Monitor - Manual (Page 4)

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HUMBOLDT
Testing Equipment for Construction Materials
Humboldt Mfg. Co.
875 Tollgate Road
Elgin, Illinois 60123 U.S.A.
U.S.A. Toll Free: 1.800.544.7220
Voice: 1.708.456.6300
Fax: 1.708.456.0137
Email: [email protected]
Displacement Crack Monitors measure displacement (out of plane) and
horizontal movement across a crack.
The Displacement Crack Monitor consists of three components: a graduated
ruler, a top plate (calibrated) and a bottom plate (not calibrated). It is only the
top and bottom plate that are fixed across a crack. The ruler is not left on the
gauge, but is only used when taking readings.
Fixing Instructions
1. Align the bottom plate parallel to the crack and fix with screws and rawlplugs
(size 6) and adhesive (figue 1).
2. Align the top plate on the other side of the crack at 90° to the bottom plate
and fix with screws and rawlplugs (size 6) and adhesive (figure 2).