PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 5-1000
Model C53 Conductivity Analyzer (universal-mount 1/2 DIN)
29
3.4 Closed Contact
TTL Input
☞
3.5 Line Power
☞
☞
The closed contact input feature of the analyzer enables
you to conveniently:
•
Hold analog outputs at their present values.
•
Hold CONTROL and ALARM relays in their present
on/off transfer states.
To initiate these actions, momentarily connect TTL Termi-
nals 9 and 10 on TB1, either locally or remotely:
NOTE:
During calibration, the selected output state (“HOLD,”
“XFER” or “ACTIVE”) overrides the TTL input hold
feature.
Refer to appropriate figures on the next page and connect
line power to TB3 terminals using the standard three-wire
connection arrangement.
Use wiring practices which con-
form to local codes
(example: National Electric Code
Handbook in the U.S.A.).
WARNING:
REMOVE LINE POWER WHILE CONNECTING LINE
POWER WIRES TO THE TB3 TERMINALS. ALSO,
USE ONLY THE STANDARD THREE-WIRE CONNEC-
TION ARRANGEMENT FOR SINGLE-PHASE LINE
POWER TO PREVENT AN UNSAFE CONDITION, AND
TO ENSURE PROPER ANALYZER OPERATION.
NOTE:
In all cases, connect the line power cable ground
wire (usually green) to:
The grounding strip at bottom of case (5 open
holes -- Figures 2-8, 2-10 or 2-12) for analyzers
with “B” prefix serial number.
The “ground symbol” terminal 1 on TB3 (Figures
2-9, 2-11 or 2-13) for analyzers with “A” or no
letter prefix serial number.
The “115” and “230” voltage circuits are protected with in-
ternal, board-mounted slow-blow fuses.
NOTE:
For 230 volt split phase line power, be sure to con-
form to local codes with regard to fusing the 115
volt line connected to the “N” terminal.
