American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 68)

56 Rev. 3
Appendix
Sensor Connector J1 Wiring
A.2 Sensor Connector J1 Wiring
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).
Pin Function
1 Sensor I + ( Red)
2 Not used
3 Not used
4 Not used
5 Not used
6 Sensor V- (Yellow)
7 Sensor I- (Black)
8 Sensor V+ (Blue)
9 Not used
J1
Pin 1