Precision Digital PD4-6620 Loop Leader+ Large Display Loop-Powered Flow Rate/Totalizer

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The Loop Leader+ Loop-Powered Flow Rate/Totalizers with Advanced Display Features.

The Precision Digital Loop Leader+ flow rate/totalizer display offers a convenient and informative representation of any 4-20 mA signal through its loop-powered, large dual-line display. The top display is a 2.8″ 5-character alphanumeric line that shows flow rate, while the bottom line is a 1.5″ 8-character alphanumeric display, which can display flow total, grand total, or a tag. The 14-segment alphanumeric characters provide a clear representation of tags, units, and alarm messages.

In addition, the display also includes a 20-segment bargraph with a numeric value of the percentage representation. The meters can be programmed and set up using the free PC-based MeterView XL software that connects via micro USB cable.

The PD4 comes in two configurations: display only and with two solid-state relays and 4-20 mA analog output. The devices also have two open collector outputs and remote contacts for alarm indication and pulse output, remote operation of programming buttons, resetting of the total, timer/stopwatch start/stop, and more. The relays can be programmed for alarm indication, sample, timer, batch control, and stopwatch.

For safe area versions of these instruments, click here.

  • Large Display NEMA 4X, IP65 Loop-Powered Wall & Pipe Mounted Flow Rate/Totalizers
  • 4-20 mA Input Displayed with ±0.02% FS 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, Control, Timer, 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
  • Externally DC Powered Backlight with Red Backlight for Alarm Conditions
  • Operating Temperature Range: -40 to 75°C (-40 to 167°F)
  • Conformal Coated PCBs for Dust & Humidity Protection
  • Pipe Mounting Kit Available
  • 3-Year Warranty

Except where noted all specifications apply to operation at +25°C.


DisplayDual-line LCD with backlight.
Both lines 14-segment alphanumeric.
Top: 2.8″ (71 mm) 5 digits
Bottom: 1.5″ (39 mm) 8 characters
Display may be programmed to turn red and flash a user-defined message on alarm condition.
Top Display5 digits (-9999 to 99999) or 5 characters
(all capital & most lower-case letters)
Bottom Display8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters
(all capital & most lower-case letters)
Backlight Power Requirement24 VDC @ 46 mA, typical
Bargraph20 segments, numeric percent indication at top
Decimal PointUp to four decimal places on top display and up to seven decimal places on bottom display
CommasCommas to indicate 1000s
(e.g. 88,987,628) on bottom display only
Dual-Scale FeatureThe 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 IndicationProgrammable: red backlight, flashing display, bargraph segment flashes on alarm. Backlight requires external 24 VDC.
Custom Alarm MessagesProgrammable for each relay/open collector: 8 characters maximum; displayed every 10 sec for 1 sec on bottom display. May be turned off.
Display Update RateAmbient > -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).
OverrangeTop: 99999
Bottom: 99,999,999 (flashing)
UnderrangeTop: -9999
Bottom: -9,999,999 (flashing)


Programming MethodButtons behind lower panel door & Free PC-based USB programming software
Enclosure & MaterialsMaterial: 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.
EnvironmentalOperating temperature range: -40 to 75°C (-40 to 167°F)
Storage temperature range: -40 to 85°C (-40 to 185°F)
Relative humidity: 0 to 90% non-condensing;
Printed circuit boards are conformally coated.
Noise FilterAverages 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 Bypass0.0 to 99.9% of full scale. Input signal changes greater than bypass value are displayed immediately.
RecalibrationRecalibration is recommended at least every 12 months.
Max/Min DisplayMax/min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
TareIf 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.
PasswordThere 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 MemoryTotal 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 Rejection64 dB at 50/60 Hz
ConnectionsRemovable screw terminals accept 12 to 22 AWG wire.
Remote contacts accept 16 to 30 AWG wire.
Tightening TorqueScrew terminal connectors: 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 Dimensions10.6″ x 12.6″ x 4.8″
(270 mm x 320 mm x 121 mm)
(H x W x D)
Weight5.5 lbs (2.5 kg)
Warranty3 years parts and labor. See Warranty Information and Terms & Conditions for complete details.


Input4-20 mA
Accuracy±0.02% of span ±1 count
Square root and programmable exponent: 10-100% FS
Voltage Drop2.1 V maximum
Equivalent Resistance105 Ω @ 20 mA
Input OverloadOver current protection to 1 A maximum, Over voltage protection to 30 VDC max (between mA+ and mA-/BL-)
Temperature Drift25 PPM/°C from -40 to 75°C ambient
FunctionLinear (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 Cutoff0.1 to 999,999 or disable. Point below at which the display always shows zero.
HART TransparencyThe 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 DisplayTop display: -9999 to 99999;
Bottom display: -9,999,999 to 99,999,999 (with commas)
Total & Grand Total DisplayTop display: 0 to 99999;
Bottom display: 0 to 99,999,999 (with commas)
13-Digit Total & Grand TotalUp to 9,999,999,999,999 using both lines with 13-digit total feature enabled.
Total Decimal PointUp to four decimal places on top, up to seven decimal places on bottom. Total decimal point is independent of rate decimal point.
TotalizerCalculates 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 BaseSeconds, Minutes, Hours, Days
Totalizer RolloverTotalizer 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 ResetVia front panel button, external contact closure on digital input, or MeterView XL.
Total & Grand Total Reset PasswordsTotal and grand total passwords may be entered to prevent resetting the total or grand total unless a password is entered.
Non-Resettable Grand TotalGrand 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 MemoryTotal and Grand Total values are stored in non-volatile memory for a minimum of ten years if power is lost.

Batch Control

MethodsAutomatic or Manual, count up or count down
Manual Batch StartPressing F1 function key starts the batch
Manual Batch Pause/StopPressing F3 once pauses the batch, pressing it twice cancels the batch
Automatic BatchingThe Loop Leader+ can be used as an automatic batch controller where batches run continuously without operator input
Batching Relay OperationSingle or dual-relay batching with optional preclose for two-stage operation
Batch PresetSet 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 PrecloseFor two-stage batch application, a preclose value can be set to close the main flow line.
Automatic Batch Restart Delay1 to 9,999 seconds. The batch will automatically restart after completion of the last batch.

Common Open Collector & Relay Specifications

NumberTwo open collectors & two relays
High or Low AlarmUser programmable for high or low alarm
Alarm Deadband0-100% FS, user programmable
Output AssignmentAlarm, Timer, Stopwatch, or Disable
Alarm Output SourceAssign to rate, total, grand total, or digital input
On & Off Time Delay0 to 9,999 seconds
Fail-Safe OperationIndependent 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 OperationAutomatic, automatic with manual override, latching (manual reset anytime), latching with reset after cleared (manual reset only after alarm has cleared)
Alarm IndicationProgrammable: red backlight, flashing display, Bargraph segment flashes on alarm. Backlight requires external 24 VDC.
Custom Alarm MessagesProgrammable for each relay/open collector: 8 characters maximum; displayed every 10 sec for 1 sec on bottom display. May be turned off.
Alarm AcknowledgeFront panel ACK button or external digital input resets output and screen indication.
Auto InitializationWhen power is applied to the meter, open collectors and relays will reflect the state of the input to the meter.
Timer OutputOne-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)
StopwatchOutput turns on when started and off when stopped.

Open Collector Outputs

RatingIsolated open collector, sinking NPN
5-30 VDC @ 150 mA maximum
Output AssignmentPulse, Alarm, Timer, Stopwatch on/off, or Disable
Pulse Output SourcePulse output based on Rate, Total, Grand Total, or Test Frequency, Alarm, Timer, Total Reset, Stopwatch on/off, or Disable
Pulse Output Factor0.000001 to 999,999.9
Pulse Width0.5 ms @ 1 kHz; 500 ms @ 1 Hz; 50% duty cycle
Pulse Output Frequency1,000 Hz maximum
Quadrature Pulse OutputAvailable for Output 2
(90° behind Output 1) 500 Hz max
Alarm Output SourceAssign to Rate, Total, Grand Total or Digital Input

Solid-State Relays

Rating250 VAC/VDC @ 1 A resistive
75 VA; 250VAC; 0.6 A pilot duty (inductive) – UL Code D300
25 VA; 250VDC; 0.6 A pilot duty (inductive) – UL Code R300
Noise SuppressionMetal oxide varistors across outputs
Relay AssignmentAlarm, Sample, Timer, Batch, Stopwatch on/off, or Disable
Alarm Output SourceAssign to Rate, Total, Grand Total, or Digital Input
Relay RuntimeMeter will keep track of how long each relay has operated and display this information.
Relay CyclesMeter 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 SourceRate, total, re-transmit; reverse scaling allowed
Scaling Range1.00 to 23.0 mA
DisableHigh impedance state, less than 1 mA
CalibrationFactory calibrated 4.00 to 20.00 mA
Underrange1.0 mA, 3.5 mA, or 3.8 mA (If input < 3.5 mA); or or Off; user selectable
Overrange20.5 mA, 20.8 mA, or 23.0 mA (If input > 20.5 mA); or Off; user selectable
Isolation500 V input-to-output
Temperature Drift0.5 μA/°C max from -40 to 75°C ambient
External Loop Power Supply7.0 VDC to 30.0 VDC maximum
Output Loop Resistance10-750 Ω @ 24 VDC; 10-1100 Ω @ 30 VDC

On-Board Digital Input

FunctionRemote operation of front-panel buttons, acknowledge/reset relays, reset total, reset max/min values, etc.
Contacts2.1 VDC on contact. Connect normally open contacts across DI+ and DI-
Logic LevelsLogic High: 2.4 to 30 VDC (max)
Logic Low: 0 to 0.9 VDC

Remote Contacts

FunctionTerminals provided for remote operation of all four programming / operation buttons (use PDA2364-MRUE control station).
Remote ButtonsMenu, Right, Up, Enter
Remote Function KeysF1 / Reset*
F2 / Max*
F3 / Ack*

MeterView XL Programming Software

AvailabilityFree download from
System RequirementsMicrosoft® Windows® 7 & 10
CommunicationsUSB 2.0 (Standard USB A to USB B) Cable provided
ConfigurationConfigure all parameters on the meter. Configure meters one at a time.
Configuration FilesGenerate with or without meter connected; Save to file for later use.
USB Power ConnectionMeter is powered by USB connection during programming, if 4-20 mA loop is not connected.
CompatibilityPrograms created for Loop Leader and Loop Leader+ may be run on either meter. Programs created for VantageView+ and ProtEX+ can be run on either meter. No other program sharing is permissible.

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 ImmunityEN 61326-1
EMC requirements for Electrical equipment for measurement, control, and laboratory use – industrial use

Datasheet: Precision Digital PD4-6620 Series Datasheet
Instruction Manual: Precision Digital PD4-6624/28 Instruction Manual

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