D.8 Input/output signal connectors
Warning:
To avoid electric shock, separate all electrical connections to the rear panel
from hazardous voltages by double or reinforced insulation. Circuits of this type are
classified as safety extra low voltage (SELV). Examples of circuits that are typically
SELV include contact closure inputs and outputs for autosamplers, and UV, RI, and
fluorescence detector signal outputs for LC/MS systems. The electrical connections on
the rear panel of this mass spectrometer are all SELV.
The instrument’s rear panel includes a removable connector that holds the screw terminals for
I/O signals. These connectors are keyed so that they can receive a signal cable inserted only one
way.
Notice:
To avoid damage to the instrument, do not exceed these voltages:
• ±30 Vdc to the Analog connection.
• 30 Vdc to the Stop Flow, Inj Start, and Switch connections.
Figure D–12: I/O signal connector
Table D–1: I/O signal connections
Callout
Screenprint
Software function
Description
Stop Flow +
Gas fail / Event Out 1
Used to stop the
solvent flow if the
nitrogen gas supply
fails. To install the stop
flow cable, connect the
cable between the
Stop Flow +/-
connections on the
ACQUITY RDa
Detector and the
Stop Flow -
August 20, 2021, 715005003 Ver. 04 (Previously released as Revision C)
Page 102
