PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 6-1100
Model P33 pH/ORP Analyzer (panel-mount 1/4 DIN)
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3.5 Relay Outputs
The analyzer is equipped with two electromechanical re-
lays. For relay setup details, see PART THREE, Section 3.5.
CAUTION:
DO NOT EXCEED THE CONTACT RATING FOR EACH
RELAY (5A 115/230 VAC). 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 ADEQUATELY CONDUCT THE CURRENT DRAW
OF THE SWITCHED LOAD(S).
Two sets of SPDT relay outputs (Relays A and B) are pro-
vided at Terminals 8 through 13 on TB5.
The relay outputs
are not powered.
The line power used to power the ana-
lyzer may also be used to power control/alarm devices with
these relay contacts. Refer to Figure 2-8 for a general wir-
ing 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.
WARNING:
MAKE SURE LINE POWER IS NOT PRESENT WHILE
CONNECTING WIRES TO TB5 RELAY TERMINALS.
FIGURE 2-8
Connecting Control/Alarm Device(s) to Electromechanical Relay(s)
