AMI 420, Installation, Operation And Maintenance Instructions, Page: 124 / 134

106
Rev. 7
Appendix
Auxiliary LHe Level/Temperature Connectors
appropriate instruments or data acquisition systems. The LHe level and
temperature sensor signals are also internally routed to the Auxiliary LHe
Level/Temperature connectors J8A and J8B.
If the Model 420 is purchased as part of a magnet system, a Magnet
Station Connector instrumentation cable will be provided with the system.
Note
For maximum noise immunity, use shielded cabling and connect
one end of the shield to the J7A or J7B connector shell.
A.2 Auxiliary LHe Level/Temperature Connectors
The two 9-pin D-sub male Auxiliary LHe Level and Temperature
connectors are identically wired and connected pin-for-pin internally.
The connectors route the incoming signals from the Magnet Station
Connectors to external level and/or temperature instruments. If an AMI
Liquid Helium Level Instrument is purchased with the Model 420 and
magnet system, an LHe level cable will be provided.
Table A-2. Connectors J8A and J8B pin definitions.
Pin Function
1 LHe Sensor I+ (Red)
2 Temperature Sensor I+ (Red)
3
Temperature Sensor V
−
(Yellow)
4
Temperature Sensor I
−
(Black)
5 Temperature Sensor V+ (Blue)
6
LHe Sensor V
−
(Yellow)
7
LHe Sensor I
−
(Black)
8 LHe Sensor V+ (Blue)
9 Not Used
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