2
2. INSTALLATION
2.1. Preliminary Tests
Upon receipt of the instrument, the gage should be checked for proper operation (including
the thermistor). See Section 3 for readout instructions. In position "B" the gage will read
around 2000 when the threaded connector is pulled out approximately 3 mm (0.125").
Do
not extend the connector more than the range of the gage.
The threaded connector on the
end of the gage should not be turned independently of the gage body.
Checks of electrical continuity can also be made using an ohmmeter. Resistance between the
gage leads should be approximately 180
, ±10
. Remember to add cable resistance when
checking (22 AWG stranded copper leads are approximately 14.7
/1000' or 48.5
/km,
multiply by 2 for both directions). Between the green and white should be approximately
3000 ohms at 25° (see Table B-1), and between any conductor and the shield should exceed 2
megohms.
2.2. Embedment Jointmeter Installation
The installation of the Vibrating Wire Embedment Jointmeter consists of two stages; first,
installing the socket and, second, installing the gage.
2.2.1. Installing the Socket
The socket of the gage is meant to be installed in the first lift of concrete. The socket comes
with a PVC plug held in place by two O’rings. This plug is designed to keep concrete from
entering the inside of the socket and to hold the socket in place while the concrete is poured.
After installation the face of the socket must coincide with the finished face of the concrete if
it is to be accessible. If the socket plug is removed and needs to be replaced it will be
necessary to temporarily remove the socket plug bolt so that the air inside the socket can
escape when the plug is forced back into the socket..
Figure 2 - Socket Installation
