4
2.2.3 Setting the Initial Rreading
2.2.3.1 Models 4400 –25, 4400-50, 4400-100, 4400-150
To allow for slight compression of the gage, it is recommended that the gage be pulled out
until a reading of
3000
-
3500
in position 'B'
is obtained. This will set the gage at
approximately 25% of its range in tension. It should be remembered that the gage should not
be rotated after pulling it from the socket. After extending the gage, wrap 2-3 layers of
electrical tape around the gage tube immediately adjacent to the socket to hold the gage at
this reading while the concrete is being placed. If the gage has to be removed from the
socket, it
MUST
be pushed back in until the pins catch and then rotated counter-clockwise
until it comes loose.
2.2.3.2 Model 4400-12
The above procedure for the longer range models is not recommended for the 4400-12
model. Here the danger of over-ranging the sensor due to the sudden release, when pulling
the gage out, is too great. So leave the transducer as is. The natural compression of the gage a
will be enough to allow for any small amount of joint closure.
6.
Don’t forget to re-install the 10-32
3/8" seal screw into the gage end flange
.
Figure 4 – Completed Embedment Jointmeter Installation
