Trident Series PD765 Process & Temperature Meters
Instruction Manual
17
4-20 mA Output & Input Signal
Connections
The Trident X2, with an optional 4-20 mA output, can
be used as an isolated temperature transmitter with a
big display by converting the thermocouple or RTD in-
put into an isolated 4-20 mA output.
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled
“mA OUT: I-, I+”. The 4-20 mA output may be
powered from an internal power supply (optional) or
from an external power supply.
Figure 33. 4-20 mA Output & Input Signal
Powered by Meter
Models include PD765-6R3-20 and PD765-6X3-20
Figure 34. 4-20 mA Output Powered by Meter
Models include PD765-6R5-10, PD765-6X5-10
Figure 35. 4-20 mA Output Powered Externally
Models include PD765-6R3-00, PD765-6X3-00,
PD765-7R3-00, PD765-7X3-00, PD765-7R5-00,
PD765-7X5-00
Other Uses for Transmitter Power
Supplies
The most common use for the Trident’s two power
supplies is for the 200 mA transmitter power supply to
power the field transmitter and the other power supply
to power the 4-20 mA output from the meter.
However, the power supplies can be used in other
ways. For instance, for level transmitters that require
the use of a heated lens, the Trident’s 200 mA power
supply could be used to power both the heated lens
and the 4-20 mA signal from the transmitter.
Figure 36. Trident X2 Powers Both the Heater
and 4-20 mA Input Signal
COM
SIGNAL CONNECTOR
mA+
2
1
3
5
4
V+
T+
EXC
2-Wire
4-20 mA
Transmitter
-
+
I-
mA OUT
P2-
P1+
4
5
3
1
2
P2+
P1-
24V OUT
6
I+
Remote Display,
Chart Recorder,
etc.
+
-
I-
mA OUT
5
6
I+
Remote Display,
Chart Recorder,
etc.
+
-
24V OUT
P+
P-
1
2
External
Power
Supply
-
+
I-
mA OUT
5
6
I+
Remote Display,
Chart Recorder,
etc.
+
-
DW2206
POWER
SIGNAL
EXC T+
V+ mA+
COM
RTD
SWITCH
TC
SERIAL
TC
RTD
1 2 3 4 5 6
COM NO
NO
NC
NC COM
RELAY2
RELAY1
4
3
6
5
2
1
3
4
1
2
5
2
1
+
I
-
I
+
mA OUT
6
5
24V OUT
2
1
P+
P-
