Precision Digital PD4-6600 Loop Leader+ Large Display Loop-Powered Process Meter

Part Number: PD4-6600 Categories: , Tag:

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The Precision Digital Loop Leader+ is a loop-powered meter that can be easily installed to show a 4-20 mA signal. It has a large, dual-line display with a 2.8-inch, 5-digit top display that displays the process variable, and a 1.5-inch, 8-character alphanumeric bottom display that displays the units of measure or a tag. Models for feet and inches show the level in feet and inches on the top display, while the bottom line can show a tag or custom message. Additionally, the meter includes a 20-segment bargraph with a numeric percentage representation.

For programming and setup, a free PC-based software, MeterView XL, is available and connects to the meter through a micro USB cable. There are two configurations available: display only and display with two solid-state relays and 4-20 mA analog output. All models come with two open collector outputs and remote contacts. The open collector outputs can be used for alarm indication, while the remote contacts can be used to remotely operate the programming buttons, acknowledge relays, start/stop a timer/stopwatch, and more. The relays can be programmed for alarm indication, on/off control, or pump alternation.

For those seeking intrinsically safe versions of the meter, please click here.

  • Large Display NEMA 4X, IP65 Loop-Powered Wall & Pipe Mounted Meters
  • 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 (PD4-6604)
  • 2.8″ (71 mm) 5 Digits 7-Segment, FT-IN & Fractions Top Display (PD4-6603)
  • 1.5″ (39 mm) 8 Alphanumeric 14-Segment Characters Bottom Display
  • Displays Level in Feet & Inches up to 999 Feet, 11 & 15/16 Inches (PD4-6603)
  • 20-Segment Bargraph with Numeric Percent Indication
  • (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
  • Relay Pump Alternation Based on Level and Runtime
  • Display Relay Runtime & Cycle Count via Relay Info Menu
  • Round Horizontal Tank Function; Just Enter Diameter & Length
  • 32-Point Linearization, Square Root Extraction and Programmable Exponent Function
  • 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.


PD4-6603Dual-line LCD with backlight.
Top: 2.8″ (71 mm), 5 digits 7-segment, FT-IN & fractions.
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.
PD4-6604Dual-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 DisplayPD4-6603: FT – IN/*: Automatically reducing fractions to lowest denominator
*FT-IN/16, FT-IN/8, FT-IN/4, FT-IN/2, FT-IN -99FT 11IN 15/16 to 999FT 11IN 15/16
PD4-6604: 5 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 input in height and the bottom display could display that same input in volume.
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).
OverrangePD4-6603: Top: 999 11 15/16
PD4-6604: Top: 99999
Bottom: 99,999,999 (flashing)
UnderrangePD4-6603: Top -99 11 15/16
PD4-6604: Top: -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.
TareTare function zeros out the meter to accommodate for weight of a container. Tare function can be assigned to a function key or a digital input.
PasswordProgrammable password restricts modification of programmed settings.
Non-Volatile MemoryAll 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
PV1: Linear (2-32 points), square root, or programmable exponent
PV2: Linear (2-32 points) or round horizontal tank
PV1: Linear (2-32 points)
PV2: Linear (2-32 points) or Round Horizontal Tank
Low-Flow / Low-Height CutoffPoint below at which the display always shows zero.
PD4-6604: 0.1 to 999,999 or disable.
PD4-6603: 1/16 to 999FT 11IN 15/16 or disable.
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.

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 PV (PV1, PV2) 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, or Disable
Pulse Output SourcePV (PV1, PV2) or Test Frequency
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 PV (PV1, PV2) or Digital Input

Solid-State Relays

Rating250 VAC/VDC @ 1 A resistive
75 VA; 250 VAC; 0.6 A pilot duty (inductive)
25 VA; 250 VDC; 0.6 A pilot duty (inductive)
Noise SuppressionMetal oxide varistors across outputs
Relay AssignmentPump Alternation, Alarm, Timer, Stopwatch on/off, or Disable
Alarm Output SourceAssign to PV (PV1, PV2) or Digital Input
Pump AlternationRelays may be programmed to alternate with each pump cycle with an elapsed time override where the pumps will alternate regardless of level. Pump alternation time can be programmed for 0 to 999:59 (hrs:min)
Relay (Pump) RuntimeMeter will keep track of how long each relay (pump) has operated and display this information.
Relay (Pump) CyclesMeter will keep track of how many times the relays (pumps) have cycled and display this information.

4-20 mA Transmitter Output

Accuracy±0.05% FS ±0.001mA
Output SourcePV1, PV2, 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 disable underrange; user selectable
Overrange20.5 mA, 20.8 mA, or 23.0 mA (If input > 20.5 mA); or disable overrange; 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 max/min values, etc. See User section of Display Functions & Messages on page 28 for a complete list of capabilities.
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 PD4-6600 Series Data Sheet
Instruction Manual: Precision Digital PD4-6603/07 F&I Instruction Manual
Instruction Manual: Precisin Digital PD4-6604/08 Instruction Manual

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