Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 16)

Section 1. Product Overview
1-8
1.2.4 Signal Panel
PVS4100 and PVS4120
Red Light: Reverse Polarity, Green Light: Power
Left Plug: External Signals (to be used with optional signal cable)
Right Plug: Power – 120VAC or 12VDC
Left Fuse: 120VAC, Right Fuse: 12VDC
Toggle Switch: Power On/Off
PVS4150
Green Light: Integral Battery Charging (AC power connected)
Red Light: External Battery Reverse Polarity
Toggle Switch: Power On/Off
Plug: AC power (coupled with optional signal cable when supplied).