PD663 Explosion-Proof Loop-Powered Meter
Instruction Manual
7
Connections
To access the connectors, remove the enclosure
cover and unscrew the two captive stainless steel
screws. Remove the meter assembly from the
enclosure. Signal connections are made to a three-
terminal removable connector on the back of the
meter assembly. Grounding connections are made to
the two ground screws provided on the base – one
internal and one external.
S+
4-20 mA signal input positive terminal
connection
S-
4-20 mA signal return/negative terminal
connection
X
Not connected (no backlight option)
B-
4-20 mA signal return/negative terminal
when using the installed loop powered
backlight option
See
for terminal positions on the rear of the
meter assembly.
•
Observe all safety regulations. Electrical wiring
should be performed in accordance with all
agency requirements and applicable national,
state, and local codes to prevent damage to the
meter and ensure personnel safety.
•
Static electricity can damage sensitive
components.
•
Observe safe handling precautions for
static-sensitive components.
•
Use proper grounding procedures/codes.
•
If the meter is installed in a high voltage
environment and a fault or installation error
occurs, high voltage may be present on any
lead or terminal.
Figure 3. PD663 Meter Assembly, Rear View
Wiring Diagrams
Signal input connections are made to a three-terminal
connector labeled S+|S-|X for models without a
backlight and S+|S-|B- for models with a backlight.
The enclosure also provides one internal and one
external earth grounding screw.
The 4-20 mA input with no backlight has a maximum
voltage drop of 1.7 V and is wired as shown in
The loop-powered backlight configuration requires a
total maximum voltage drop of 4.7 V. The backlight is
recommended for dim lighting conditions and is
enabled when wired as shown in
The enclosure also provides one internal and one
external earth grounding screw.
Figure 4. PD663 Input Connections without Backlight
Figure 5. PD663 Input Connections with Backlight
WIRING INSTRUCTIONS
Connect signal positive to terminal S+.
Connect signal negative to terminal S-.
If backlight installed, connect
signal negative to terminal B-, not S-.
S+ S- X
S+ S- B-