MODEL PD650 - PD656 LARGE DISPLAY PROCESS METERS
2
GENERAL FEATURES
The PD650, PD655 and PD656 are Large Display Process
Meters with flow rate, totalizer and batch control capabilities.
Each accepts the common process signals such as 4-20 mA,
0-5 VDC, 1-5 VDC and 0-10 VDC and displays these signals in
engineering units on a large, high efficiency, 4½ digit red LED
display. All units also provide two isolated 24 V power supplies to
drive both the input and output loops. Options include up to 4 relays
for alarms or batch controlling, as well as an isolated 4-20 mA
transmitter output.
Key Features
• Two 24 VDC isolated transmitter power supplies
• 115 or 230 VAC field selectable power
• Rate display in units per day, in addition to second, minute and hour
• Programmable setpoints for latching/non-latching relay operation
• Built-in snubbers on each relay contact
• Any set point programmable for process/rate or total
• Programmable exponent for weirs and flumes
• Pump Alternation (PD655 & PD656 Only)
Single Button Scaling
Single button scaling means that these meters can be completely
programmed using only one button. Simply press the ENTER button
to initiate the automatic menu scan. When the desired menu appears
press the ENTER button again. Once in a menu, press the ENTER
button when the display reads the desired value. To exit setup &
programming press the ACK (Acknowledge) button while displaying
any of the main menus. It’s that simple!
Stand Alone Scaling (Internal or External)
These meters may be scaled without
a signal source or calibrated with a
signal source.
Lockout and Menu-Title Disabling
The ability to modify programming values can be restricted by
installing a lockout jumper on terminals at the rear of the instrument.
In addition, certain menu titles can be programmed not to appear
during the menu scroll.
Large, Bright, Red LEDs
The large, bright, red LED display of these Large Display Process
Meters is designed to make them easily read from far away in a
dimly lit process plant.
5
5
5
Simplify Loops with Two 24 V Supplies
The PD650, PD655 and PD656 are ideal for loops that consist of a
transmitter, a digital meter and a DCS or computer because they can
provide isolated power to drive both the input and output loops.
Universal Process Inputs & Linearization
The Large Display Process Meters accept both voltage and current
inputs and can be scaled for virtually any engineering unit. In Addition,
these meters feature automatic square root extraction, programmable
exponent for weirs and flumes and 11-point custom calibration.
Functions that can be locked out with the lockout jumper.
Ability to change values may or may not be restricted
Menu title always appears.
Menu titles that can be excluded with dspy menu functions.
setpts
PD650
2.3"
(58 mm)
PD656
0.8"
(20.3 mm)
PD655
1.0"
(25.4 mm)
ACTUAL DIGIT SIZES
JI
4-20 MA
Transmitter
24 VDC for
4-20 mA
Output
Option
+
-
EN
AK
R
CM
S+
S-
P-
P+
P1-
P1+
Transmitter Powered
from Internal Power Supply
4-20 mA
Transmitter
JI
Loop
Power Supply
24 VDC for
4-20 mA
Output
Option
++
- -
EN
AK
R
CM
S+
S-
P-
P+
P1-
P1+
Transmitter Powered
from External Power Supply
JI
3-Wire
Transducer
Signal
24 VDC for
4-20 mA
Output
Option
+
-
EN
AK
R
CM
S+
S-
P-
P+
P1-
P1+
Transducer Powered
from Internal Power Supply
JI
3-Wire
Transducer
24 VDC for
4-20 mA
Output
Option
+
-
EN
AK
R
CM
S+
S-
P-
P+
P1-
P1+
Direct Voltage
Signal Connections
Differential
Pressure
Transmitter
Display flow rate by extracting
the square root of a signal
from a DP transmitter.
Flow
4-20 mA Level
Transmitter
Level
Display volume in a round
horizontal tank.
(24 pages)
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