PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Model P53 pH/ORP Analyzer (universal-mount 1/2 DIN)
Rev. 6-501
28
3.5 Relay Outputs
The analyzer may be equipped with up to four electrome-
chanical relays. For relay setup details, see PART THREE,
Section 4.5.
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).
Up to four sets of SPDT relay outputs (Relays A, B, C, and
D) are provided at Terminals 1 through 12 on TB2.
The re-
lay outputs are not powered.
The line power used to
power the analyzer may also be used to power control/
alarm devices with these relay contacts. See Figure 2-11 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.
WARNING:
MAKE SURE LINE POWER IS NOT PRESENT WHILE
CONNECTING WIRES TO THE TB2 RELAY TERMINALS.
FIGURE 2-11
Connecting Control/Alarm Device(s) To Electromechanical Relay(s)
