American Magnetics 188CPS Point-Sensing Instrument - Manual (Page 13)

12
Installation
Installing the sensor
2. Rack mount the instrument if desired
If the instrument has a rack mount chassis, follow the following procedure:
a. Attach the rack mount adapter pieces to the instrument by first removing
the four screws on the side of the instrument that attach the cover to the
chassis. Attach the rack mount adapter pieces to the sides of the
instrument by reinstalling the screws.
b. Install the monitor in a 19" rack by securing the front panel to the rail in
each of the four corners with mounting hardware supplied by the cabinet
manufacturer.
3. Install the sensor in the target vessel
Exercise care when installing the sensor since dents, crimps, bends or other physical
distortions in the plate sensors will change electrical characteristics possibly causing
calibration errors and/or disruption of proper instrument operation. Before installing
the sensor, the user may want to review the Calibration and Operation sections to
determine what, if any, calibration procedures may be necessary.
Note
The coaxial interconnecting cables and the oscillators are temperature
sensitive and should be mounted in such a manner as to avoid very large
temperature variations such as those encountered in the path of dewar vents.
Large temperature gradients (for tank penetrations) are acceptable as long as
the gradient is relatively constant during operation.
Make a note of the physical location of each point-sensing plate pair on the sensor
assembly, and the physical location of the entire sensor assembly with respect to the
vessel. This information will be necessary to associate an LED indication from the
instrument with an actual liquid level.
4. Connect the oscillator cables to the AMI sensor
Connect the oscillators to the sensor using the supplied RG-59/U coaxial cable.
Ensure the oscillator is connected in the correct orientation (see page 5 for a system
diagram). The cable length between the oscillator and the sensor should not exceed 6
feet if possible.
Mark each oscillator cable with a labeling scheme that identifies a cable with a
specific plate pair and its associated location on the sensor assembly.
Some sensor assemblies may integrate a continuous sensing element with several plate
sensors. Do not connect the continuous sensing element to a Model 188CPS
instrument. The Model 188CPS is designed only for point-sensing application.