Precision Digital Corporation Loop Leader+ Series User manual

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
•Large Display NEMA 4X, IP65 Loop-Powered Wall & Pipe Mounted Flow Rate/Totalizers
•4-20 mA Input Displayed with ±0.02% Accuracy
•2.1 Volt Drop Maximum
•2.8" (71 mm) 5 Alphanumeric 14-Segment Characters Top Display
•1.5" (39 mm) 8 Alphanumeric 14-Segment Characters Bottom Display
•20-Segment Bargraph with Numeric Percent Indication
•8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines
•Display Rate & Total Simultaneously
•Automatic or Manual Batch Control
•Display Open Channel Flow with Programmable Exponent Feature
•32-Point Linearization & Square Root Extraction
•(2) Open Collector Outputs Standard; Assignable to Pulse, Alarm, Timer, or Stopwatch
•(2) Optional Loop-Powered Solid-State Relays; Assignable to Alarm, Sample, Timer, Batch, or Stopwatch
•Stopwatch & Timer Functions to Drive Relays & Open Collectors
•Optional Isolated 4-20 mA Analog Output
•Display Relay Runtime & Cycle Count via Relay Info Menu
•Free PC-Based MeterView XL USB Programming Software
•HART®Protocol Transparent
•Externally DC Powered Backlight with Red Backlight for Alarm Conditions
•Safe Area Operating Temperature Range: -40 to 75°C (-40 to 167°F)
•Conformal Coated PCBs for Dust & Humidity Protection
•Password Protection
•ATEX and IECEx Certified as Intrinsically Safe (PD4-6628 Only)
•Pipe Mounting Kit Available
•Light / Horn & Reset Button Accessory
•Control Station Accessory for Remote Operation of Instrument
•3-Year Warranty
IECEx
All Models
PD4-6628 Only

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
2
The Complete PD4-6600 Series
General Purpose
PD4-6603
Feet & Inches Meter
PD4-6604
Process Meter
PD4-6624
Flow Rate/Totalizer
Hazardous Area
PD4-6607
Feet & Inches Meter
PD4-6608
Process Meter
PD4-6628
Flow Rate/Totalizer

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
3
Table of Contents
Introduction......................................................................................................... 6
Key Features....................................................................................................... 7
Ordering Information........................................................................................ 11
Accessories.................................................................................................. 11
Specifications................................................................................................... 14
Display .......................................................................................................... 14
General.......................................................................................................... 14
Input .............................................................................................................. 15
Rate/Totalizer................................................................................................ 15
Batch Control ............................................................................................... 15
Common Open Collector & Relay Specifications...................................... 16
Open Collector Outputs............................................................................... 16
Solid-State Relays........................................................................................ 16
4-20 mA Transmitter Output........................................................................ 16
On-Board Digital Input................................................................................. 16
Remote Contacts.......................................................................................... 17
MeterView XL Programming Software........................................................ 17
General Compliance Information.................................................................... 17
Electromagnetic Compatibility.................................................................... 17
PD4-6628 Compliance Information ................................................................. 18
Hazardous Area Approvals ......................................................................... 18
EU Declaration of Conformity............................................................................. 19
Safety Information............................................................................................ 19
Field Modification......................................................................................... 19
Installation......................................................................................................... 19
Unpacking..................................................................................................... 19
Wall Mounting Instructions ......................................................................... 20
Mounting Dimensions ................................................................................ 20
Conduit Holes Location.............................................................................. 20
Pipe Mounting Instructions......................................................................... 21
MeterView XL Programming Software........................................................ 22
MeterView XL Software Installation ........................................................... 22
Connecting to the Computer...................................................................... 23
Specifications............................................................................................. 23
Connections...................................................................................................... 24
Connectors Labeling.................................................................................. 24
Wiring Diagrams............................................................................................... 25
I/O Parameter Table .................................................................................. 25
Safe Area Current Loop (4-20 mA) Connections ....................................... 25
Safe Area Digital Input Connections.......................................................... 25
Safe Area 4-20 mA Output Connections.................................................... 26
Safe Area Solid-State Relay Connections ................................................. 26
Safe Area Open Collector Output Connections.......................................... 26
Remote Operation of Meter........................................................................ 26
Wiring Connections for MOD-PD2LH Models............................................ 27
Setup and Programming.................................................................................. 28
Overview....................................................................................................... 28
MeterView XL Programming Software........................................................ 28
Programming Buttons...................................................................................... 29
Display Functions & Messages................................................................... 30
Main Menu..................................................................................................... 34
Setting Numeric Values ............................................................................. 35
Scaling the 4-20 mA Input(INPUT).................................................................. 36
Available Engineering Units....................................................................... 37
Setting Custom Units (CUSTOM)................................................................. 37
Scaling Example........................................................................................ 38

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
4
Setting the Display Features (DISPLAY).................................................... 38
Changing the Engineering Units (UNITS).................................................. 38
Changing the Decimal Point (DEC.PT)........................................................ 38
Enabling or Disabling the Commas on the Bottom Display (COMMA) ......... 39
Display Capabilities Optimization (TOP and BOTTOM)................................ 39
Using 13 Digits to Display Total................................................................. 39
Configuring the Display (TOp and BOTTOM).............................................. 40
Programming the Bargraph........................................................................ 40
Programming the Outputs (OUTPUT).......................................................... 41
Open Collector Outputs (OPEN COLLECTR) ............................................. 42
Solid-State Relay Outputs (RELAY)........................................................... 47
Isolated 4-20 mA Output (4-20 mA)......................................................... 52
Output Manual Control (CONTROL)............................................................ 52
Advanced Features Menu (ADVANCED)....................................................... 53
Advanced Rate Setup (ADV RATE)........................................................... 53
Input Signal Conditioning Functions (FUNCTION) ..................................... 54
Additional Engineering Units...................................................................... 61
Low-Flow Cutoff (CUTOFF) ........................................................................ 62
Noise Filter (FILTER)................................................................................ 62
Enabling Password Protection (PASSWRD) ................................................ 62
Programmable Function Keys User Menu (USER)..................................... 63
Changing System Settings (SYSTEM)........................................................ 65
Meter Operation................................................................................................ 67
Front Panel Buttons Operation................................................................... 67
Function Keys Operation............................................................................. 67
Digital Input Operation................................................................................. 67
Maximum/Minimum Readings..................................................................... 67
Total Reset Capabilities............................................................................... 68
Total Reset via Button Under Lower Panel Door ....................................... 68
Total Reset via Remote Contact................................................................ 68
Total Reset via Digital Input....................................................................... 68
Total Reset Password Protection............................................................... 68
Runtime & Cycle Count (INFO)................................................................... 68
Changing Engineering Units....................................................................... 68
Batch Controller Operation.............................................................................. 69
Default Batch Control Operation................................................................. 69
Batch Control Operation Example.............................................................. 69
Manual Batch Control .................................................................................. 71
Automatic Batch Control............................................................................. 72
Troubleshooting............................................................................................... 73
Reset Meter to Factory Defaults.................................................................. 73
Determining Software Version.................................................................... 73
Factory Default Settings............................................................................. 74
Troubleshooting Tips................................................................................... 75

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
5
Table of Figures
Figure 1. Meter Mounting Holes Location .......................................................... 20
Figure 2. Meter Mounting Holes Dimensions..................................................... 20
Figure 3. Meter Dimensions –Side View............................................................ 20
Figure 4. Meter Dimensions - Front View ........................................................... 20
Figure 5. Conduit Holes Location –Bottom View.............................................. 20
Figure 6. Vertical Pipe Mount Assembly............................................................. 21
Figure 7. Horizontal Pipe Mount Assembly........................................................ 21
Figure 8. Connector Labeling for PD4-66XX-LNN.............................................. 24
Figure 9. Connector Labeling for PD4-66XX-L5N .............................................. 24
Figure 10. 4-20 mA Input Connection without Backlight................................... 25
Figure 11. 4-20 mA Input Connection with Backlight........................................ 25
Figure 12. Digital Input Connections .................................................................. 25
Figure 13. 4-20 mA Output Connections ............................................................ 26
Figure 14. Solid-State Relay Connections.......................................................... 26
Figure 15. Open Collector Output Connections................................................. 26
Figure 16. PDA2364-MRUE Control Station Connected
to Remote Contacts on PD4 ........................................................................ 26
Figure 17. Light / Horn and Button (MOD-PD2LH) Connected to PD4............. 27
Video
Watch the Loop-Powered Meters Video
Click or Scan

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
6
Disclaimer
The information contained in this document is
subject to change without notice. Precision Digital
Corporation makes no representations or warranties
with respect to the contents hereof; and specifically
disclaims any implied warranties of merchantability or
fitness for a particular purpose.
•Read complete instructions prior to installation and
operation of the meter.
•Risk of electric shock or personal injury.
•This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2022 Precision Digital Corporation.
All rights reserved.
Introduction
The Loop Leader+ loop-powered large display flow
rate/totalizers can be installed virtually anywhere to
provide convenient and informative display of any
4-20 mA signal. One of the most convenient features of
these instruments is their large, dual-line display which is
typically used to display flow rate on the 2.8" 5-character
alphanumeric top display and flow total, flowgrand total,
or a tag on the 1.5" 8-character alphanumeric bottom
display. Both display lines use 14-segment,
alphanumeric characters that provide much clearer
indication of tags, units, or alarm messages than
7-segment characters do.
Further enhancing the display on these instruments is
a 20-segment bargraph that also includes a numeric
value of the percentage the bargraph represents.
These flow rate/totalizers can be installed virtually
anywhere because they get their power from the
4-20 mA loop and therefore require no separate
power source, and they only drop 2.1 V, so they add
very little burden to the loop. Additional features that
allow these instruments to be installed virtually
anywhere include a NEMA 4X, IP65 rated enclosure,
an operating temperature range of -40 to 167°F (-40
to 75°C) (for safe area products), conformally coated
PCBs, and a backlit LCD that can be read in bright
sunlight or dimly lit areas. The PD4-6628 model is an
intrinsically safe and nonincendive version of the Loop
Leader+ that is agency approved for installation in
hazardous areas. It also carries electrical safety
approvals.
Free, PC-based, MeterView XL software that
connects to the meter via a micro USB cable is
available for programming and setup of the meters.
To download the latest MeterView XL programming
software and manual, visit predig.com/meterviewxl.
All models come equipped with two open collector
outputs and remote contacts. There are also models
available with two solid-state relays and isolated
4-20 mA analog output options. The open collector
outputs are useful for alarm indication or pulse output.
The remote contacts can be used to remotely operate
the four programming buttons, to reset the total, to
start/stop a timer/stopwatch, and more. The relays
can be programmed for alarm indication, on/off
control, or simple batch control.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
7
Key Features
1. Available on PD4-6624 only. Requires external 24 VDC power.
2. Backlight requires external 24 VDC power.
Large Informative Display
One of the most convenient features of the PD4 Loop
Leader+ Series is its large, dual-line display. The
PD4’s whopping 2.8" 5-character alphanumeric top
display and 1.5" 8-character alphanumeric bottom
display, plus a 20-segment bargraph with percentage
indication on top, makes reading and understanding
process values easier than ever.
Predefined display units give users even more display
flexibility. Plus, the high contrast backlit LCD display
is readable from far away and under various lighting
conditions.
Backlight Turns Red on Alarm
When an alarm occurs, the display can be
programmed to turn red and flash. In addition, a
unique custom alarm message for each of the two
relays and two open collectors can be displayed on
the bottom display. These features can be activated
even if no relay or open collector is connected.
Commas on 8-Digit Totalizer for
Easy Reading
It may seem like a simple thing, but adding commas
to an eight-digit number makes it easier to read:
Dual-Scale Feature
Users can use the dual-scale feature to display
the input in two different scales. For instance, the
example below shows an application where the Loop
Leader+ displays the input in gallons per minute and
cubic feet per minute.
14-Segment Characters
Notice how much better letters like “T”, “N” and “K”
appear as 14-segment characters on the Loop Leader+
vs 7-segment characters found on many other meters.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
8
Predefined and Custom Units
The PD4-6624/28 flow rate/totalizers have the most
common predefined rate and volume units. If the
desired unit is not available, the user can program a
custom unit.
•If the total is disabled in the System –Total
menu, the meter has six available
preprogrammed unit classes: volume, height,
temperature, pressure, weight, and rate. When
the desired unit class or unit of measure within a
class is not available, a custom unit may be
programmed.
Password Protection
A password can be set up for programming security to
prevent unauthorized changes to the programmed
parameter settings.
Remote Contacts
Remote Contacts are standard on the PD4 and the
meter can be operated via a remote control station
(PDA2364-MRUE). The PDA2364-MRUE mimics the
PD4 meter’s four programming buttons: Menu, Right
Arrow, Up Arrow, and Enter.
Multiple Outputs
•Two open collector outputs (standard)
•Two solid-state relays (optional)
•One 4-20 mA output (optional)
The open collector outputs and relays generally
operate in the same manner, with the major exception
being the open collectors are not available for pump
alternation and the relays are not available with pulse
features. The open collectors and relays can be
controlled either automatically or manually.
The isolated analog output signal can be configured
to represent the process variable (rate, total, or
retransmit). It can also be reverse scaled such that
the meter’s high calibration value outputs 4 mA and
the meter’s low calibration outputs 20 mA.
Input Signal Conditioning
Functions (FUNCTION)
The Function menu is used to select the input signal
conditioner applied to the input: linear, square root,
programmable exponent, or round horizontal tank
volume calculation. Multi-point linearization is part of
the linear function selection.
Meters are set up at the factory for linear function with
2-point linearization. The linear function provides a
display that is linear with respect to the input signal.
Square Root Linearization (SQROOT)
The square root function can be used to linearize the
signal from a differential pressure transmitter and
display flow rate in engineering units.
PD4-6624 Displaying Flow Rate by Applying the Square
Root Function to the Output of a DP Transmitter.
Programmable Exponent
Linearization (EXPONENT)
The programmable exponent can be used to linearize
the signal from level transmitters in open-channel flow
applications using weirs and flumes.
The PD4-6624, in combination with an ultrasonic level
transmitter, makes for an economical way to measure
and display open channel flow rate in most weirs and
flumes. A guide such as the ISCO Open Channel
Flow Measurement Handbook can provide the user
with all the information needed: the exponent used in
the flow equation for the desired flow units and the
flow rate for any given head height. For example, to
display the open channel flow rate from a 3" Parshall
flume, the ISCO handbook advises the exponent is
1.547 and at the maximum head height of 3.0 feet,
the flow rate is 3.508 MGD.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
9
Rate/Totalizer Features
Display Flow Rate & Total at the
Same Time
The PD4-6624 can display flow rate and total at the
same time. In addition, the meter can toggle between the
rate and total and their corresponding units as the
following example illustrates.
Total Limit & Initial Value
The Advanced –Total Count menu allows the digit limit
to be selected between 8-digit (bottom display only) and
13-digit (uses top and bottom display to display the full
number).
The user can set the initial value at which the total and
grand total should start counting.
Using 13 Digits to Display Total
The top and bottom displays can be set up to display
a 13-digit total.
Note: The number above should be read as
6,843,276,349,187.
Total & Rate in Different Units
The user can select to display total in different units
than the rate. For instance, a customer could
measure flow rate in gallons per minute and total in
acre-feet by simply selecting AF (acre-feet) units for
the total. Additionally the user can enter a custom unit
and conversion factor to display the total in any unit of
measure.
Rate in Units Per Second, Minute,
Hour, or Day
The user may select a rate time base in units per
second, minute, hour, or day. The time base is the
amount of time over which the rate parameter will
totalize. For example, if the rate was 10 gallons/min
(and stayed constant for one minute), then the total
would increase by 10 every minute.
4-20 mA Output for Rate or Total
The 4-20 mA output can be assigned to the rate or
total.
Total Stored in Non-Volatile
Memory
Total and grand total values, and all programmed
settings are stored in non-volatile memory for a
minimum of ten years if power is lost.
Total Reset Capabilities
The total and grand total can be reset using a button
behind the lower panel door, the remote contacts
connected to a control station, an external contact
closure on the digital input, or MeterView XL. In
addition, both total and grand total reset can be
password protected to prevent unauthorized resets.
Total Reset via Button Under
Lower Panel Door
The PD4-6624 is equipped with four buttons located
under the lower panel door. The F2 function key is set
up to reset the total. If reset grand total is enabled, it
is possible for the user to reset either the total or the
grand total.
Total Reset via Remote Contact
The PD4-6624 is equipped with remote contacts
located behind the lower panel door of the meter.
These can be connected to a PDA2364-MRUE
control station for remote operation of all four
programming / operation buttons. The F2 function key
is set by default to reset the total and grand total.
4321
INPUTS
I
+ DI- mA- mA+
4
321
SSR OUTPU
T
C NO C N
O
RLY 2 RLY
21
mA OUT
I+ I-
MENU
MENU F1
ENTER
NEXT UP ENTER
F2 F3
REMOTE
CONTACTS
M R U E G

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
10
Total Reset via Digital Input
The PD4-6624’s digital input may also be used to reset
the total or grand total using a PDA2361-R control
station.
Total Reset Password Protection
Total and grand total passwords can be set to prevent
resetting the total or grand total unless a password is
entered. Grand total reset can be disabled through
the meter interface, and it can also be permanently
disabled.
Non-Resettable Grand Total
The user can set up the grand total to be non-resettable by
selecting YES at the PERMLOC menu; see page 59 for
details. Once this is done, the grand total can never be reset.
Batch Control Capabilities
The metercan be equipped with two solid-state relays
that may be set up for batch control. Selecting batch
control for relay 1 enables the batching features on the
meter. The top display changes to show the total and the
bottom display changes to show the batch preset. The
function keys also change for batch control functions
such as F1 starts a batch, F2 opens the preset menu to
allow the preset value to be changed, and F3 stops the
currently running batch. Enabling batch control for
relay 1 allows access to the batch menu under relay 2.
The second relay may be programmed as a preclose
relay or as another batching relay with its own preset
amount.
Manual or Automatic Operation
Batching can be set to either manual or automatic
operation.
If set to automatic, then a delay before the next batch
starts must be programmed.
Count Up or Down Batching
The batch total can be set to count up or down.
DI+ DI- mA- mA+

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
11
Ordering Information
General Purpose Instruments
Loop Leader+ PD4-6624 • General Purpose
Model
Description
PD4-6624–LNN
Large Display Loop-Powered
Rate/Totalizer, General Purpose,
No Options
PD4-6624–L5N
Large Display Loop-Powered
Rate/Totalizer, General Purpose,
Two Solid-State Relays and
4-20 mA Analog Output
Hazardous Area Instruments
Loop Leader+ PD4-6628 • Hazardous Area
Model
Description
PD4-6628–LNN(1)
Large Display Loop-Powered
Rate/Totalizer, Hazardous Area,
No Options
PD4-6628–L5N(1)
Large Display Loop-Powered
Rate/Totalizer, Hazardous Area,
Two Solid-State Relays and
4-20 mA Analog Output
1. Electrical Safety and Hazardous Area Approvals
Note: All models come standard with two open collector
outputs and contacts for remote operation.
Accessories
Model
Description
PDA0004
Cable Gland
PDAPLUG2
Plastic Conduit Plug
PD9501
Multi-Function Calibrator
PD9502
Low-Cost Signal Generator
PDA1002
6" DIN Rail Mounting Kit
PDA1024-01
24 VDC Power Supply for DIN Rail
PD659
SignalIsolators, Splitters, and Conditioners
PDA2360
Plastic Control Stations
PDA2360 Plastic Control Stations
Model
Description
PDA2360-E
Emergency Button
PDA2361-A
Ack Button
PDA2361-B
Blank Button
PDA2361-R
Reset Button
PDA2361-T
Tare Button
PDA2361-S
Stop Button
PDA2361-Q
Silence Button
PDA2362-AR
Ack And Reset Buttons
PDA2362-BB
Two Blank Buttons
PDA2362-SS
Start and Stop Buttons
PDA2364-MRUE
Menu, Right, Up, Enter Buttons
PDA2364-MSBS
Menu, Start, Batch, Stop Buttons
Notes:
1.These control stations do not carry hazardous area
approvals and are thus not suitable for location in
hazardous areas. The use of additional protective
devices may allow them to be installed in a safe area
and connected to a device in a hazardous area. User
should consult a professional engineer to determine
suitability of these products for their specific application.
2.Control stations can be connected directly to the PD4
meter’s Remote Contacts. See Remote Operation of
Meter on page 26 for details.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
12
Light / Horn & Button Accessories(2)
PD4-6624 meter shown with MOD-PD2LHRB1 Red Light /
Horn and Button. Meter sold separately.
Model
Description
MOD-PD2LHRB1
Red Light / Horn and Button
Mounted and Wired to PD4(1)
MOD-PD2LHGB1
Green Light / Horn and Button
Mounted and Wired to PD4(1)
MOD-PD2LHYB1
Yellow Light / Horn and Button
Mounted and Wired to PD4(1)
MOD-PD2LHBB1
Blue Light / Horn and Button
Mounted and Wired to PD4(1)
MOD-PD2LHWB1
White Light / Horn and Button
Mounted and Wired to PD4(1)
Note:
1. Specify MOD-PD2LH model as a separate item on the
order for the PD4 meter to order the Light / Horn & Button
accessory installed and wired. Meter is sold separately.
2. Light / Horn & Button accessory available only on
PD4-6624 units.
Each Light / Horn accessory comes with
9 labels for the button.
Pipe Mounting Kit
PD4-6624 Meter Shown mounted to pipe using
PDA6260 pipe mounting kit. See Pipe Mounting
Instructions on page 21 for details.
Model
Description
PDA6260
2" Pipe Mounting Kit for PD4
Signal Splitter & Conditioner Accessories
Model
Description
PD659-1MA-1MA
Signal Isolator with One 4-20 mA
Input and One 4-20 mA Output
PD659-1MA-2MA
Signal Splitter with One 4-20 mA
Input and Two 4-20 mA Outputs
PD659-1V-1MA
Signal Conditioner with One 0-10
VDC Input and One 4-20 mA
Output
PD659-1MA-1V
Signal Conditioner with One
4-20 mA Input and One 0-10 VDC
Output
Note: These signal splitters and conditioners do not carry
hazardous area approvals and are thus not suitable for
location in hazardous areas. The use of additional protective
devices may allow them to be installed in a safe area and
connected to a device in a hazardous area. User should
consult a professional engineer to determine suitability of
these products for their specific application.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
13
PDA1024-01 24 VDC Power Supply
The PDA1024-01 is a DIN rail mounted 1.5 A,
24 VDC power supply that can be used to power
the 4-20 mA transmitter.
Useful Tools
PD9501 Multi-Function Calibrator
This PD9501 Multi-Function Calibrator has a variety
of signal measurement and output functions, including
voltage, current, thermocouple, and RTD.
PD9502 Low-Cost Signal Generator
The PD9502 is a low-cost, compact, simple to use
4-20 mA or 0-10 VDC signal generator. It can easily
be set for 0-20 mA, 4-20 mA, 0-10 V or 2-10 V
ranges. Signal adjustment is made with a one-turn
knob. A wall plug is provided with the instrument.
Optional USB power bank is available.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
14
Specifications
Except where noted all specifications apply to operation at +25°C.
Display
Display
Dual-line LCD with backlight.
Top: 2.8" (71 mm),
5 alphanumeric 14-segment characters.
Bottom: 1.5" (39 mm),
8 alphanumeric 14-segment characters.
Display may be programmed to turn red
and flash a user-defined message on
alarm condition.
Top Display
5 digits (-9999 to 99999) or 5 characters
(all capital & most lower-case letters)
Bottom Display
8 digits (-9,999,999 to 99,999,999;
separated by commas) or 8 characters
(all capital & most lower-case letters)
Backlight Power
Requirement
24 VDC @ 46 mA, typical
Bargraph
20 segments, numeric percent indication
at top
Decimal Point
Up to four decimal places on top display and
up to seven decimal places on bottomdisplay
Commas
Commas to indicate 1000s
(e.g. 88,987,628) on bottom display only
Dual-Scale
Feature
The input can be displayed in different
scales on the top and bottom displays.
For instance, the top display could display
the flow in GPM and the bottom display
could display that same input in CFM.
Alarm Indication
Programmable: red backlight, flashing
display, Bargraph segment flashes on alarm.
Backlight requires external 24 VDC.
Custom Alarm
Messages
Programmableforeachrelay/opencollector:
8charactersmaximum; displayedevery 10sec
for1seconbottomdisplay. May beturned off.
Display Update
Rate
Ambient > -10°C: 1 Update/Second
Ambient = -20°C: 1 Update/2 Seconds
From -20°C to -40°C the update rate
slows down 1 second for every -2°C
(e.g. at -24°C, 1 update/4 seconds).
Overrange
Top: 99999; Bottom: 99,999,999 (flashing)
Underrange
Top: -9999; Bottom: -9,999,999 (flashing)
General
Programming
Method
Buttons behind lower panel door & Free
PC-based USB programming software
Enclosure &
Materials
Material: High impact Polycarbonate with
UV stabilizer enclosure, UL 94V-0
Rating: NEMA 4X / IP65
Gasket: Polyurethane
Color: gray
Includes four PG11 through-hole conduit
openings, with two factory installed PG11,
IP68, black nylon threaded hole plugs with
backing nuts.
Environmental
Operatingtemperature range:
-40to 75°C(-40to167°F)
Storagetemperaturerange:
-40to 85°C(-40to185°F)
Relative humidity: 0 to 90% non-condensing;
Printed circuit boards are conformally coated.
Noise Filter
Averages the input signal over a period of
time between 1 and 16 seconds to
dampen the effects of a noisy signal that
causes a jumpy display.
Filter Bypass
0.0 to 99.9% of full scale. Input signal
changes greater than bypass value are
displayed immediately.
Recalibration
Recalibration is recommended at least
every 12 months.
Max/Min
Display
Max/min readings reached by the process
are stored until reset by the user or until
power to the meter is turned off.
Tare
If the totalizer is disabled, the Tare
function zeros out the meter to remove
the weight of a container. Tare function
can be assigned to a function key or the
digital input.
Password
There are three separate passwords
available that can be set independently of
each other: Main, Total, and Grand Total.
The Main password prevents access to
the meter Programming Mode. Total and
Grand Total passwords prevent resetting
the total and grand total, respectively.
Non-Volatile
Memory
Total and Grand Total values, and all
programmed settings are stored in non-
volatile memory for a minimum of ten
years if power is lost.
Normal Mode
Rejection
64 dB at 50/60 Hz
Connections
Removable screw terminals accept 12 to
22 AWG wire
Remotecontacts:Accept 16 to30AWGwire.
Tightening
Torque
Screw terminalconnectors: 4.5 lb-in(0.5 Nm)
Mounting screws: 8.0 lb-in max. (0.9 Nm)
Remote contacts: 2.5 lb-in (0.28 Nm)
Overall
Dimensions
10.6" x 12.6" x 4.8"
(270 mm x 320 mm x 121 mm) (H x W x D)
Weight
5.5 lbs (2.5 kg)
Warranty
3 years parts and labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
15
Input
Input
4-20 mA
Accuracy
±0.02% of span ±1 count,
Square root and
programmable exponent: 10-100% FS
Voltage Drop
2.1 V maximum
Equivalent
Resistance
105 Ω @ 20 mA
Input Overload
Over current protection to 1 A maximum
Over voltage protection to 30 VDC max
(between mA+ and mA-)
Temperature
Drift
25 PPM/°C from -40 to 75°C ambient
Function
Linear (2-32 points), square root, or
programmable exponent
PV2: Linear (2-32 points)or round horizontal
tank (If total is disabled and PV2 is enabled)
Low-Flow Cutoff
0.1 to 999,999 or disable. Point below at
which the display always shows zero.
HART
Transparency
The meter does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The meter is not
affected if a HART communicator is
connected to the loop. The meter does
not display secondary HART variables.
Rate/Totalizer
Rate Display
Top display: -9999 to 99999;
Bottom display: -9,999,999 to 99,999,999
(with commas)
Total & Grand
Total Display
Top display: 0 to 99999;
Bottom display: 0 to 99,999,999
(with commas)
13-Digit Total &
Grand Total
Up to 9,999,999,999,999 using both lines
with 13-digit total feature enabled.
Total Decimal
Point
Up to four decimal places on top, up to
seven decimal places on bottom. Total
decimal point is independent of rate
decimal point.
Totalizer
Calculates total based on rate and rate
units to display total in engineering units. A
custom factor must be programmed if using
custom defined units.
Time Base
Seconds, Minutes, Hours, Days
Totalizer
Rollover
Totalizer rolls over when display exceeds
99,999,999 (9,999,999,999,999 if 13-digit
limit enabled). Relay status reflects display.
Total & Grand
Total Reset
Via front panel button, external contact
closure on digital input, or MeterView XL.
Total & Grand
Total Reset
Passwords
Total and grand total passwords may be
entered to prevent resetting the total or
grand total unless a password is entered.
Non-Resettable
Grand Total
Grand total reset may be disabled through
the meter interface. Grand total reset may
be permanently disabled by selecting YES
at the PERMLOCK menu.
•Once the Grand Total has been programmed as
“non-resettable” the feature CANNOT be disabled.
Non-Volatile
Memory
Total and Grand Total values are stored in
non-volatile memory for a minimum of ten
years if power is lost.
Batch Control
Methods
Automatic or Manual,
count up or count down
Manual Batch
Start
Pressing F1 function key starts the batch
Manual Batch
Pause/Stop
Pressing F3 once pauses the batch,
pressing it twice cancels the batch
Automatic
Batching
The Loop Leader+ can be used as an
automatic batch controller where batches
run continuously without operator input
Batching Relay
Operation
Single or dual-relay batching with optional
preclose for two-stage operation
Batch Preset
Set via F2 function key anywhere between
0.0001 to 99,999 based on batch total
decimal point. If batch total is assigned to
bottom, the preset can be up to 8 digits.
Batch Preclose
For two-stage batch application, a preclose
value can be set to close the main flow line.
Automatic Batch
Restart Delay
1 to 9,999 seconds. The batch will
automatically restart after completion
of the last batch.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
16
Common Open Collector &
Relay Specifications
Number
Two open collectors & two relays
High or Low
Alarm
User programmable for high or low alarm
Alarm Deadband
0-100% FS, user programmable
Output
Assignment
Alarm, Timer, Stopwatch, or Disable
Alarm Output
Source
Assign to rate, total, grand total, or digital
input
On & Off Time
Delay
0 to 9,999 seconds
Fail-Safe
Operation
Independent for each open collector
and relay.
Fail-safe on, the output is on under
normal conditions.
Fail-safe off, the output is on under
alarm conditions.
Alarm Operation
Automatic, automatic with manual
override, latching (manual reset
anytime), latching with reset after
cleared (manual reset only after alarm
has cleared)
Alarm Indication
Programmable: red backlight,flashing
display,Bargraphsegmentflashes onalarm.
Backlight requires external 24VDC.
Custom Alarm
Messages
Programmableforeachrelay/opencollector:
8charactersmaximum; displayed every 10
secfor1sec onbottomdisplay.May be
turnedoff.
Alarm
Acknowledge
Front panel ACK button or external
digital input resets output and screen
indication.
Auto Initialization
When power is applied to the meter,
open collectors and relays will reflect
the state of the input to the meter.
Timer Output
One-shot or Continuous
Off Time Delay: 1 sec to 99:59:59
(hrs:min:sec)
On Time: 1 sec to 99:59:59 (hrs:min:sec)
Stopwatch
Output turns on when started and off
when stopped.
Open Collector Outputs
Rating
Isolated open collector, sinking NPN
5-30 VDC @ 150 mA maximum
Output
Assignment
Pulse, Alarm, Timer, Total Reset,
Stopwatch on/off, or Disable
Pulse Output
Source
Pulse output based on Rate, Total,
Grand Total, or Test Frequency, Alarm,
Timer, Total Reset, Stopwatch on/off, or
Disable
Pulse Output
Factor
0.000001 to 999,999.9
Pulse Width
0.5 ms @ 1 kHz; 500 ms @ 1 Hz;
50% duty cycle
Pulse Output
Frequency
1,000 Hz maximum
Quadrature Pulse
Output
Available for Output 2 (90° behind
Output 1) 500 Hz max
Alarm Output
Source
Assign to Rate, Total, Grand Total or
Digital Input
Solid-State Relays
Rating
250 VAC/VDC @ 1A resistive
75VA; 250VAC; 0.6A pilot duty
(inductive)
25VA; 250VDC; 0.6A pilot duty
(inductive)
Noise
Suppression
Metal oxide varistors across outputs
Relay
Assignment
Alarm, Sample, Timer, Batch, Stopwatch
on/off, or Disable
Alarm Output
Source
Assign to Rate, Total, Grand Total, or
Digital Input
Relay Runtime
Meter will keep track of how long each
relay has operated and display this
information.
Relay Cycles
Meter will keep track of how many times
the relays have cycled and display this
information.
4-20 mA Transmitter Output
Accuracy
±0.05% FS ±0.001mA
Output Source
Rate, total, re-transmit; reverse scaling
allowed
Scaling Range
1.00 to 23.0 mA
Disable
High impedance state, less than 1 mA
Calibration
Factory calibrated 4.00 to 20.00 mA
Underrange
1.0 mA, 3.5 mA, or 3.8 mA
(If input < 3.5 mA); or Off;
user selectable
Overrange
20.5 mA, 20.8 mA, or 23.0 mA
(If input > 20.5 mA); or Off;
user selectable
Isolation
500 V input-to-output
Temperature Drift
0.5 µA/°C max from -40 to 75°C ambient
External Loop
Power Supply
7.0VDC to30.0VDCmaximum
Output Loop
Resistance
10-750 Ω @ 24 VDC; 10-1100 Ω @ 30 VDC
On-Board Digital Input
Function
Remote operation of front-panel buttons,
acknowledge/reset relays, reset total,
reset max/min values, etc. See User
section of Display Functions &
Messages on page 30 for a complete list
of capabilities.
Contacts
2.1 VDC on contact. Connect normally
open contacts across DI+ and DI-
Logic Levels
Logic High: 2.4 to 30 VDC (max)
Logic Low: 0 to 0.9 VDC

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
17
Remote Contacts
Function
Terminals provided for remote operation of
all four programming / operation buttons
(use PDA2364-MRUE control station).
Remote
Buttons
Menu, Right, Up, Enter
Remote
Function
Keys
F1 / Display*
F2 / Reset*
F3 / Ack*
*Defaults
•DO NOT connect anything else, other than
normally open switch contacts, to the Remote
Contacts terminals.
MeterView XL Programming
Software
Availability
Free download from www.predig.com
System
Requirements
Microsoft® Windows® 7 & 10
Communications
USB2.0 (Standard USB AtoMicroUSB B)
Cableprovided
Configuration
Configure all parameters on the meter.
Configure meters one at a time.
Configuration Files
Generate with or without meter
connected; Save to file for later use.
USB Power
Connection
Meter is powered by USB connection
during programming, if 4-20 mA loop is
not connected.
•The meter should only be connected to a computer
while it is located in a safe area.
To download the latest MeterView XL programming
software and manual, visit predig.com/meterviewxl.
•The image in the software shows the panel meter
version. The same software is used for the PD4.
General Compliance
Information
Electromagnetic Compatibility
EMC Emissions
•CFR 47 FCC Part 15 Subpart B Class A
emissions requirements (USA)
•AS/NZS CISPR 11
Class A ISM emissions requirements
(Australia)
•EN 55011
Group 1 Class A ISM emissions
requirements (EU)
•ICES-001 Issue 4 ISM emissions
requirements (Canada)
EMC Emissions
and Immunity
EN 61326-1
EMC requirements for Electrical equipment
for measurement, control, and laboratory
use –inductrial use
All PD4 Models

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
18
PD4-6628 Compliance
Information
Hazardous Area Approvals
ATEX
II 1 G D
Ex ia IIC T4 Ga
Ex ia IIIC T200°C Da
-40°C ≤ Ta ≤ 75°C
Certificate Number: CML 18ATEX2091X
IECEx
Ex ia IIC T4 Ga
Ex ia IIIC T200°C Da
-40°C ≤ Ta ≤ 75°C
Certificate Number: IECEx CML 18.0051X
PD4-6628 Only
ATEX/IECEx Special Conditions for Safe Use
The following conditions relate to safe installation
and/or use of the equipment.
•The equipment loop/power port must be
connected to an intrinsically safe barrier with
Uo≥ 5.8V.
•The PD4 enclosure is non-metallic. Under certain
extreme circumstances, the plastic enclosure may
store an ignition-capable level of electrostatic
charge. Therefore, the user/installer shall
implement precautions to prevent the build-up of
electrostatic charge, e.g. locate the equipment
where a charge-generating mechanism (such as
wind-blown dust) is unlikely to be present and
clean with a damp cloth.
•All cable entries into the equipment shall be via
cable glands or conduit which provide a minimum
degree of protection of IP54.
•The equipment shall not be opened when a
hazardous atmosphere is present.
•The remote contact port shall only be connected to
voltage free contacts.
For European Community:
The PD4-6628 must be installed in accordance with
the ATEX directive 2014/34/EU, the product
certificates CML 18ATEX2091X, IECEx CML
18.0051X and the product manual.
There is no need to remove the meter from its case to
complete the installation, wiring, and setup of the
meter for most applications.
I.S. Equipment
Entity
Parameters
Required
Relationship
Between Entity
Parameters
I.S. Barrier Entity
Parameters
V max (or Ui)
≥
Voc or Vt (or Uo)
I max (or Ii)
≥
Isc or It (or Io)
P max, Pi
≥
Po
Ci + Ccable
≤
Ca (or Co)
Li + Lcable
≤
La (or Lo)
For North American Community:
Installation and service of this device and/or
associated apparatus (barrier) should be performed
only by trained service personnel
and must be installed in accordance with the
manufacturer’s control drawing, Article 504 of the
National Electric Code (ANSI/NFPA 70) for installation
in the United States, or Section 18 of the Canadian
Electrical Code for installations in Canada.
•EXPLOSION HAZARD –Do not disconnect
equipment unless power has been removed or the
area is known to be non-hazardous
•RISQUE D’EXPLOSION –NE PAS BRANCHER NI
DÉBRANCHER SOUS TENSION.
Year of Construction
This information is contained within the serial number
with the first four digits representing the year and
month in the YYMM format.
IECEx

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
19
EU Declaration of Conformity
For shipments to the EU and UK, a Declaration of
Conformity was printed and included with the product.
For reference, a Declaration of Conformity is also
available on our website www.predig.com/docs.
Safety Information
•Read complete instructions prior to installation and
operation of the meter.
•Installation and service should be performed only
by trained service personnel.
•Service requiring replacement of internal
components must be performed at the factory.
•Control room equipment must not use or generate
more than 250 VRMS or VDC.
•Hazardous location installation instructions for
associated apparatus (barrier) must be followed
when installing this equipment.
•For safe installation of an ATEX approved
transmitter in series with PD4-6628 loop-powered
meters, the hazardous location installation
instructions for the transmitter, PD4-6628 loop-
powered meter, and associated apparatus (barrier)
must be compatible.
•PD4-6628 Series Loop-Powered meters do not add
capacitance or inductance to the loop under normal
or fault conditions.
•Substitution of components may impair hazardous
location safety.
•Equipment contains non-metallic materials and
therefore special care and consideration should be
made to the performance of these materials with
respect to chemicals which may be present in a
hazardous environment.
Field Modification
Service requiring replacement of internal components
must be performed at the factory.
Entire meter assembly (electronic assembly) may be
replaced within the field with a unit supplied from the
factory labeled “Field Modification”.
Installation
There is no need to open the clear plastic front cover
in order to complete the installation, wiring, and setup
of the meter.
All programming is done using MeterView XL
software or through the buttons and switches located
behind the lower panel door and are accessible by
removing the single securing screw. Wires should be
run through the knockout holes located on the bottom
of the meter, see Figure 5. Conduit Holes Location –
Bottom View on page 20 for details.
There are a total of four pre-drilled conduit entry holes
located at the bottom of the meter. If the need to drill
additional holes arises, make sure you will have the
clearance necessary for conduit mounting hardware.
The PD4 comes with two factory installed PG11,
IP68, black nylon threaded hole plugs with backing
nuts for unused conduit holes.
•PD4-6628 installation must be performed in
accordance with Control Drawing DW2638
(contained within LIM4-6600-2) in order to meet
agency approval ratings.
Unpacking
Remove the meter from box. Inspect the packaging
and contents for damage. Report damages, if any,
to the carrier.
If any part is missing or the meter malfunctions,
please contact your supplier or the factory for
assistance.

PD4-6624 & PD4-6628 Loop-Powered Flow Rate/Totalizers
Instruction Manual
20
Wall Mounting Instructions
The meter can be mounted to any wall using the four
provided mounting holes. Note that the bottom mounting
holes are located underneath the lower door panel. To
mount the meter to a wall, follow these instructions
•Prepare a section of wall approximately 11" x 13"
(280 mm x 330 mm) for meter mounting by marking
with a pencil the mounting holes (shown in Figure 1)
on the wall.
•Select the appropriate mounting screws for the
mounting surface to be used. The mounting holes
diameter is shown on Figure 2.
Note: Mounting screws are not included.
•Using a drill bit slightly smaller than the girth of the
mounting screws, pre-drill holes at the mounting
locations previously marked.
•Insert mounting screws into the four mounting holes
and screw them into the pre-drilled holes. DO NOT
overtighten the mounting screws as it is possible that
the enclosure could crack and become damaged.
Figure 1. Meter Mounting Holes Location
Figure 2. Meter Mounting Holes Dimensions
Mounting Dimensions
Figure 3. Meter Dimensions –Side View
Figure 4. Meter Dimensions - Front View
Conduit Holes Location
Figure 5. Conduit Holes Location –Bottom View
Mounting Hole
Mounting Hole
Mounting Hole
Mounting Hole
Lower
Door
Panel