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4
3. PRIOR TO INSTALLATION
3.1 Adjusting Model 4200 to the Desired Range
Geokon embedment strain gages are supplied fully sealed and pretensioned. Model 4200 gages
are normally supplied with the wire tension set near the middle (about 2500 microstrain) of their
range (from 1000 to 4000 microstrain). If the range needs to be adjusted for some reason, the
wire tension may be changed by the following procedure:
Attach the red and black leads to a readout box that has been set to position D, reading in
microstrain. Grip the small collar under the shrink tube and rotate the end flange as shown in
Figure 5. Rotate clockwise to decrease the initial reading and counterclockwise to increase the
reading. For example, if the gage will see all compression it should be set to around 4000
microstrain.
Figure 5 - Adjusting Wire Tension
3.2 Gage and Cable Assembly
Insert the flat part of the gage into the slot in the coil assembly located at the end of the cable.
Slide the hose clamp over the assembly and tighten.
Figure 6 - Assembled Gage and Coil Housing
Alternatively, the coil housing can be glued in place using cyanoacrylate glue. If this method is
chosen, it will no longer be possible to remove the gage from the coil housing.
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