Omega Engineering PHCN-410 Operator's Manual page 7

mA output.
2-4
reached. The wiring configuration is application depend
The PHCN-410 has a fixed 4-20
setpoint is reached. When the load
to the NC and COM, the relay is closed until the
Setpoint Relays:
Connect the proper load to the NO and COM
and COM terminals.
When the load is connected to the NO and COM, the re
open until the
displayed.
2.2.3
Making Output Connections
For Hi and Lo
Automatic Temp
Compensotion;
however, the temperature
features
Encyclopediam.
Installing
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