Geokon 4422, Instruction Manual

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2.2.2 Surface Mounting
For surface mounting two stainless steel feet are supplied that can be screwed on to the
threaded rods. Prepare some quick setting epoxy and apply to both the surface of the
monument and to the surface of the stainless steel feet. With the metal pin holding the
crackmeter in its midrange position still in place, press the feet down on to the monument
surface and hold in place until the epoxy sets up. Remove the metal pin.
Figure 2 - Model 4422-2 Monument Crackmeter, Surface Mounting Type
2.3 Initial Readings
Initial readings must be taken and carefully recorded along with the temperature at the time of
installation. These readings serve as a reference for subsequent deformation calculations.
2.4 Cable Installation and Splicing
The cable should be routed to minimize the possibility of damage due to moving equipment,
debris or other causes. The cable can be protected by the use of flexible conduit, which can be
supplied by Geokon.
Terminal boxes with sealed cable entries are available from Geokon for all types of applications.
These allow many gages to be terminated at one location with complete protection of the lead
wires. The interior panel of the terminal box can have built-in jacks or a single connection with a
rotary position selector switch. Contact Geokon for specific application information.
Because the vibrating wire output signal is a frequency rather than a current or voltage,
variations in cable resistance have little effect on gage readings; therefore, splicing of cables has
no ill effects, and in some cases may in fact be beneficial. The cable used for making splices
should be a high quality twisted pair type, with 100% shielding and an integral shield drain wire.
When splicing, it is very important that the shield drain wires be spliced together. Always
maintain polarity by connecting color to color.