Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 29)

Section 2. Installation
2-3
2.5 Signal Wiring
External input capabilities of the sampler are implemented by the use of an
optional external signal cable plugged into an external receptacle on the side of
the sampler. External inputs of different types can be used by choosing the
appropriate pair of wires in the cable.
On the PVS4150 the signal cable is combined with the AC Power cable, thus
limiting the number of connections possible.
FIGURE 2-2. External Signal Cable for PVS4100 and PVS4120
Wiring to remote/external functions should AVOID ALL AC
POWER LINES if possible and/or be run in shielded cable
terminating the shield at the AC ground terminal at the remote
site. IMPORTANT