A.3 auxiliary connector j2 pinout, Appendix – American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) User Manual
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Rev. 3
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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