Aquametrix 2200C Conductivity Controller User Manual - Manual (Page 6)

3.4 Electrical Connections
CAUTION: The instrument operates from line voltage. This constitutes a possible shock hazard.
Ensure that line power is removed before attempting connections. Note: A separate
source of line power may have been connected to the floating relay contacts.
3.4.1 To access the terminal strips open the door of the instrument and then unscrew the
captive retaining screw near the upper right hand corner of the panel. Now swing
open the panel to reveal the terminal strip on the power supply circuit board and the
smaller terminal strip on the back of the main circuit board.
3.4.2 The terminal strip on the power supply board at the back of the instrument is
labeled for line power, relay outputs and analog outputs. Connect the wiring in
accordance with this labeling. (Refer to Fig.1)
Note: Control Relay B is not used in the 2200C.
Terminals 4 and 5 are wired directly to the input line voltage. These terminals can
be used to supply power to the relays. Use the common ground of Terminal 1 as
the ground for the auxiliary devices. A separate source of power can also be used
to provide power to the relays. Ensure that the circuit breaker supplying the
instrument is able to supply enough current to the auxiliary devices, to ensure
proper operation of the instrument.
CAUTION: Connecting the line voltage to incorrect terminals may cause serious damage.