American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 69)

Rev. 3 57
Appendix
Auxiliary connector J2 pinout
A.3 Auxiliary Connector J2 Pinout
The HI level and LO level contacts are provided for external use by the
customer. When a HI or LO level condition exists, the respective contact
pairs are closed. All setpoints have 1/2 mm hysteresis, therefore the
respective contact pairs may “chatter” if the liquid sloshes, bubbles, etc.
The HI level and LO level contacts also provide positive indication of a
power-off condition. With a power-off condition, both the HI level and LO
level contacts will be closed, which is a state unique to the power-off
condition.
The following table provides the specifications for the contacts:
Pin Function
1 4-20 mA current loop input
(optional feature)
2 4-20 mA current loop output
(optional feature)
3 0-10 VDC output
(optional feature)
4 0-10 VDC or 4-20 mA
common (optional feature)
5 & 6 Lo level relay contacts (dry)
7 & 8 Hi level relay contacts (dry)
9 Not used
Max switching VA 10
Max switching voltage 30 VAC or 60 VDC
Max switching current 0.5 A
Max continuous current 1.5 A
J2
Pin 1