American Magnetics 188CPS Point-Sensing Instrument - Manual (Page 14)

13
Installation
Interconnect with oscillators
Caution
Moisture or contaminants in any of the BNC coaxial connectors can short out
the sensor and cause a false ‘full’ level indication or other erroneous
readings. A pack of non-conductive electrical connection lubricant (ECL) 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 doped connectors then
remove any excess ECL from the outside of the connector. Added protection
can be achieved by covering the doped connections with a short section of
heat-shrink tubing.
Note: MSDS sheets for the ECL are available upon request.
5. Connect the instrument to the oscillators
Caution
Operation of the AMI Model 188CPS Liquid Level Instrument with a device
other than an AMI Liquid Level Sensor may void the instrument warranty.
Using the OSC1 through OSC5 coaxial connectors, connect the instrument to the
oscillators using an extension RG-59/U coaxial cable. The length of the extension
cable can be varied to suit the specific application, however, varying the extension
cable length has minor effects on the calibration. To eliminate calibration errors,
calibrate the instrument with the desired custom extension cable in place.
Note
Once a calibration is performed, the particular oscillator, oscillator cable,
and extension cable arrangement should remain connected. Do not rearrange
the cable and oscillator connections after calibration, since minor variations
between cabling and oscillators may exist.
The oscillators should be connected to the instrument in a manner that orders the
instrument output in a physically meaningful way, i.e. OSC1 should be the lowest
plate pair on the sensor assembly and OSC5 should be the highest. If multiple 188CPS
instruments are required, then group the oscillator inputs according to contiguous
plate pairs in ascending or descending order.
6. Connect the rear panel relay contact terminal block if desired
Using the mating connector supplied for the rear panel terminal block, connect the
relay contact pairs to external equipment if desired. The contact pairs do not supply
power. Observe the rating limits provided on page 7.