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mA
output.
2-4
2-5
setpoint is
reached. The wiring configuration is application dependent.
The PHCN-410 has a fixed 4-20
setpoint is reached. When the load is connected
to the NC and COM, the relay is closed until the
Setpoint Relays:
Connect the proper load to the NO and COM terminols or the NC
and
COM
terminals.
When the load is connected to the NO and COM, the relay is
open until the
displayed.
2.2.3
Making Output Connections
For Hi and Lo
value
is not
Automatic
Temperoture
Compensotion;
however, the temperature
features
Encyclopediam.
Installing the Controller
The PHCN-410
O”C,
a resistor with a value of 100 ohms can
be wired to Terminals 1 and 2. The temperature display will show
approximately 0°C. For a complete temperature versus resistance
table, consult the OMEGA Temperature Measurement Handbook
and
25”C,
a precision resistor can be used to simulate the
appropriate temperature value to the unit. For example, if the
control process runs at
pH
electrode.
If an ATC input is not provided to the meter, the temperature
reading will default to 25°C. If the process temperature is constant,
but not
pH
electrode or (in
selected models) built into the mounting assembly of the
pH
electrode, built into the body of the
-
see Figure
2-3).
The 100 ohm Pt RTD temperature probe can be separate from
the
temperature
probe to Terminals 1
ond
2 (no
polarity
leads
of the
Automatic Temperoture Compensotion (ATC), connect the
100 ohm Pt RTD
combination electrode to the BNC connector on the
bock of the unit.
2.
If using
pH
Installing the Controller
2.2.2 Making Input Connections
1.
Connect the