American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 22)

10 Rev. 3
Installation
Sensor Preparation
2.2 Rack Mounting the Instrument
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 instrument 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.
Warning
Do not remove the cabinet feet and then reinsert the original screws.
Doing so could present a severe life-threatening electrical hazard. If
removal of the cabinet feet is desired, replace the original screws
with screws not to exceed 1/4" in length. Screws longer than 1/4"
will contact and damage the printed circuit board inside the unit.
2.3 Preparing the Sensor for Connection
Prepare the sensor to be connected to the instrument by soldering the
sensor leads to a male 9-pin D-Sub connector which will connect to J1 on
the rear panel of the instrument. Refer to the Appendix of this manual and
the AMI sensor manual for the proper pinout and wire color connections.
Connect the sensor to connector J1 on the rear panel.
Warning
Although the sensor connector terminals are isolated from earth
ground and therefore touching one terminal is not hazardous, the
voltage between terminals is at a hazardous potential. The sensor
connector is for use with an AMI LHe sensor and the wiring for the
sensor is to have no live parts which are accessible. Conductors
connected to its terminals must be insulated from user contact by
basic insulation rated for 150 VAC (Category I).
The lead wire for the sensor may be sized by the following equations. For
input line voltages greater than or equal to 105 VAC or 210 VAC:
For input line voltages less than 105 VAC or 210 VAC:
R 420 5.21L – =
R 337 5.21L – =