ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
31
Power Connections
Power connections are made to a two-terminal
connector labeled POWER on Figures
. See
on page
. The meter operates
regardless of DC polarity. The + and - symbols are
only a suggested wiring convention.
Figure 9. Power Connections
Signal Connections
Signal connections are made to a five-terminal
connector labeled SIGNAL shown in Figures
. See
. The COM (common)
terminal is the return for all types of inputs.
Current and Voltage Connections
The following figures show examples for current and
voltage connections.
There are no switches or jumpers to set up for current
and voltage inputs. Setup and programming is
performed through the front panel buttons.
Figure 10. Transmitter Powered by Internal Supply
(PD8-765-6X-10 and PD8-765-6X5-10)
Figure 11. Transmitter Powered by External Supply
or Self-Powered
The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.
The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.
Figure 12. Voltage Input Connections
The meter is capable of accepting any voltage from
-10 VDC to +10 VDC.
Thermocouple and RTD
Connections
The following figures show examples for
thermocouple and RTD connections.
The RTD/TC selector switch must be set to the proper
position for the meter to accept the selected
temperature input.
The input type is selected using the
Setup
menu.
The selected thermocouple input must correspond to
the thermocouple sensor and wire type used.
Figure 13. Thermocouple Input Connections
Figure 14. Three-Wire RTD Input Connections
The meter accepts two, three, or four-wire RTDs.
The three-wire RTD connection has built-in lead wire
compensation.
1
2
AC or DC
POWER
Required External Fuse:
5 A max, Slow Blow
POWER CONNECTOR
+
-
