American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 27)

13
Installation
Sensor cabling
2.4 Connecting the Oscillator Cables to the AMI Sensors
For Model 286 inputs A and B, connect each sensor to the Model 286 using
a supplied 6 foot RG-59/U coaxial cable.
For Model 286 inputs C and D, an external AMI oscillator must be used
(note that inputs A and B do not require an external oscillator). For each
sensor to be connected to either input C or input D of the instrument,
connect the sensor to the oscillator using a supplied 6 foot 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 instrument and sensor for inputs A and B (or
the oscillator and the sensor for inputs C and D) should not exceed 6 feet
unless longer lengths were discussed with an Authorized AMI Technical
Representative.
Caution
Moisture or contaminants in any of the BNC coaxial connectors can
short out the sensor and cause a
indication or other
erroneous readings. A pack of non-conductive electrical connection
lubricant (ECL or “Dielectric Tune-up Grease”) has been included
with the liquid level sensor packaging to reduce the possibility of
this occurring. If desired, apply a small amount of ECL to any of the
BNC connectors that may be exposed to moisture. Mate the ECL-
coated connectors then remove any excess ECL from the outside of
the connector. Added protection can be achieved by covering the
ECL-coated connections with a short section of heat-shrink tubing.
Note
MSDS sheets for the ECL are available upon request.
2.5 Connecting C and D Sensor Inputs to the Oscillator
Caution
Operation of the AMI Model 286 Liquid Level Instrument with a
device other than an AMI Liquid Level Sensor may void the
instrument warranty.
Connect each oscillator to either the C or D input of the Model 286 using a
RG-59/U coaxial cable. The length of the extension cable can be varied to
suit the specific application. AMI has confirmed proper operation for up to
500 feet of RG-59/U coaxial cabling between the instrument and oscillator.