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PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Model P63 pH Analyzer
Rev. 7-1201
28
3.6 Relay Outputs
Electromechanical
Relays (standard)
The analyzer is equipped with three relays. They may be
the standard electromechanical relays or the optional solid
state AC or DC relays. For relay setup details, refer to
PART THREE, Section 5.3.
CAUTION:
DO NOT EXCEED THE CONTACT RATING FOR EACH
RELAY (5A 115/230 VAC FOR ELECTROMECHAN-
ICAL RELAYS, OR 2A CONTINUOUS FOR SOLID
STATE RELAYS). WHEN SWITCHING LARGER
CURRENTS, USE AN AUXILIARY RELAY SWITCHED
BY THE ANALYZER RELAY TO EXTEND ANALYZER
RELAY LIFE. WHEN USING RELAY OUTPUTS, MAKE
SURE THAT LINE POWER WIRING CAN ADE-
QUATELY CONDUCT THE CURRENT DRAW OF THE
SWITCHED LOAD(S).
Two sets of SPDT relay outputs (Relays A and B) are pro-
vided at Terminals 1 through 6 on TB4. One SPST Relay C
output is provided at Terminals 7 and 8 on TB4.
The relay
outputs are not powered.
The line power used to power
the analyzer may also be used to power the control or alarm
devices with these relay contacts. Refer to Figure 2-8 for a
general wiring arrangement. Always check control wiring to
insure that line power will not be shorted by the relay
switching action, and that wiring conforms to local codes.
FIGURE 2-8
Connecting Control/Alarm Device(s) to
Electromechanical Relay(s)
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