Precision Digital PD6820 Loop-Powered Flow Rate Totalizer

Introducing the Precision Digital ProtEX-RTA PD6820, a reliable explosion-proof flow rate and totalizer designed for safety and efficiency. This device can easily display both flow rate and total from a 4-20 mA analog output flowmeter.

One of the key benefits of the PD6820 is that it is loop-powered. This means you won’t need to install extra power lines in hazardous areas, saving you time and money.

The PD6820 features:

  • A five-digit upper display for flow rate.
  • A seven-character lower display for total.
  • A standard backlight for easy reading in low light conditions.

Like all ProtEX products, the PD6820 is certified for use in hazardous environments with FM, CSA, ATEX, and IECEx approvals. This ensures that you can trust its performance in critical applications.

What sets the PD6820 apart are its:

  • Wide viewing angle display, allowing for easy visibility from different angles.
  • SafeTouch® through-glass buttons, which let you program and operate the device without removing the cover, enhancing safety in hazardous areas.

Choose the Precision Digital ProtEX-RTA PD6820 for a safe, efficient, and user-friendly solution to your flow measurement needs.

    • 4-20 mA Input
    • Loop-Powered Flow Rate/Totalizer
    • 1.5 Volt Drop (4.7 Volt Drop with Backlight)
    • Display Rate & Total Simultaneously
    • Loop-Powered Backlight with Red Backlight for Alarm Conditions
    • NEMA 4X, IP65 Front
    • -40 to 158°F (-40 to 70°C) Operating Temperature Range
    • Free PC-Based USB Programming Software
    • 5-Digit Alphanumeric Top Line
    • 8-Digit Alphanumeric Bottom Line
  • 8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines
  • 20-Segment Bargraph with Numeric Percent Indication
  • Conformal Coated PCBs for Dust & Humidity Protection
  • Two Open Collector Outputs Standard
  • Dual-Line Display
  • 1/8 DIN Shallow Depth Case
  • Optional Loop-Powered Solid State Relays
  • Optional 4-20 mA Analog Output
  • UL & C-UL 61010 Listed for Electrical Safety
  • UL & C-UL Listed as Intrinsically Safe and Nonincendive
  • ATEX and IECEx Certified as Intrinsically Safe

Display Features

The Loop Leader’s display provides multiple ways to help users understand and keep track of their processes. The most obvious is the dual line which typically allows the user to display both flow rate and total at the same time. There is also a bargraph that includes a numeric value of the percentage the bargraph represents. Finally, to alert users to an alarm condition, the display can turn red and flash an alarm message.

Display Flow Rate & Total at Same Time

One of the key features of the Loop Leader Flow Rate/Totalizers is their ability to display flow rate and total at the same time. In addition, the meter can toggle between the rate and total and their corresponding units.

Toggle Flow Rate and Rate Units on Top,
Toggle Total Flow and Total Units on Bottom

Wide Variety of Display Capabilities

In addition to the most common setup of flow rate on the top line and flow total on the bottom line, these meters can be set up for a variety of display configurations.

Display Flow Rate and Toggle Between Units & Tag

The following table shows the items that can be displayed on the Top and Bottom lines:

Top Line Can Display:Off (Blank)Preset batch valueRateStopwatchRate and its units alternatingTimers OC and relaysTotalMinTotal and its units alternatingMaxTagMin & MaxUnits

Bottom Line Can Display:Off (Blank)Units for value on top lineTotal (with units or tag alternating)TagTotal, its units, and the rate and units alternatingPreset batch valueGrand total (with units or tag alternating)Tag and rate units alternatingGrand total, units, and rate units alternatingTag and total units alternatingRate (with units or tag alternating)Rate’s percentage of max scaleRate and the total’s units alternatingmA input valueRate or total unitsmA output value

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:

Bargraph Provides Quick Understanding

To help users get a quick understanding of where their process is at, certain Loop Leader skus are available with a 20-segment bargraph. This bargraph also includes a numeric value of the percentage the bargraph represents. The bargraph can be programmed to represent either the rate or total or it can be disabled.

Bargraph Based on Total

Alarms Indicated by Flashing Red Messages

When an alarm occurs, the Loop Leader’s display can be programmed to turn red and flash an alarm message along with the process variable and an alarm indicator (!). (Alarm indicator symbols are not available on bargraph skus) The Loop Leader’s flashing red alarm message can be activated even if no relay or open collector is connected.

Change Between Units without Needing to Re-Scale the Meter

It is possible to change the display units within the selected unit class without the need to re-scale the meter. When selecting a new unit from within the DISPLAY menu (e.g. changing from gallons (GAL) to liters (L)), the meter will automatically convert the display values to display the new unit. If entering a custom unit (CUSTM), a custom conversion factor will need to be entered.

Predefined and Custom Units

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 by using the (CUSTOM) menu.

Max/Min Display

The max & min readings (peak & valley) reached by the process can be displayed either continuously or momentarily:

  1. Display momentarily by pressing the F1 key (default) or assigning to any of the other function keys or to the digital input in the User menu. Press Enter to lock/unlock max/min display.
  2. Display continuously by assigning either display line to max/min through the Display menu.

Any of the F1-F3 function keys (buttons) and the digital input can be programmed to reset the max & min readings.

Dual-Scale Display Feature

Users can use the Loop Leader’s dual-scale feature when they want to show the same input in two different scales. For instance, an application where the Loop Leader displays the input in gallons per minute and cubic feet per minute.

Rate in GPM on Top, Rate in CFM on Bottom

Outputs

Loop Leaders are available with two open collector outputs as standard and two solid state relays and 4-20 mA output as options. The open collector outputs and relays generally operate in the same manner, with the major exception being the open collectors are not available for batch control or sampling and the relays are not available with pulse features. The open collectors and relays can be controlled either automatically or manually. The alarm status (with flashing red message) will show on the display even with no output wired.

Two Open Collector Outputs

The Loop Leader is equipped with two NPN open collector outputs that may be set up for pulse outputs, alarms, timed pulses, stopwatch on/off, or disabled. Pulse outputs can be set to transmit the rate, total or grand total. Output 2 may be used to generate a quadrature output based on the other open collector output. An output test mode is also selectable to generate pulses at a constant programmable frequency. The open collectors are commonly used to generate a pulse for every user-defined amount of flow that has been generated. For instance, the Loop Leader can be programmed to generate a pulse for every 100 gallons of flow.

Two Optional Solid State Relays

The meter is optionally equipped with two solid state relays that may be set up for alarms, timer, stopwatch on/off, sample or batch control. The relays are rated at 250 VAC/DC @ 1 A for resistive loads and 75 VA @ 0.6 A, 250 VAC/DC max (Safe Area only) for inductive loads. Alarms are available based on the rate, total, grand total, or digital input.

Sampling Relay

A relay set to sample will trigger when the total or grand total value has incremented by a programmed amount. The relay can be programmed to stay on for a specified amount of time. For example: if a relay is set to sample the total with a COUNT of 1,000 and a TIME of 10 seconds, the relay will energize for 10 seconds each time the total increments by 1,000 (e.g. 1000, 2000, 3000).

Optional Isolated 4-20 mA Output

The isolated analog output signal can be configured to represent the rate, total or to retransmit the 4-20 mA signal input without the need to scale the output. While the output is nominally 4-20 mA, the signal will accurately accommodate under- and over-ranges from 1 to 23 mA. The output can be reverse scaled such that the meter’s high calibration value outputs 4 mA and the meter’s low calibration outputs 20 mA.

Resetting the Open Collectors and Relays

The open collectors and relays (alarms) may be programmed to reset in the following ways:

  • Automatic (AUTO): Alarm will reset automatically once the alarm condition has cleared.
  • Automatic/Manual (AUTO.MAN): Alarm will reset automatically once the alarm condition has cleared but can also be reset using the Enter button (or whichever function key is set to acknowledge) at any time.
  • Latching (LATCH): Alarm must be reset manually and can be done so at any time. Press the Enter (ACK) button at any time to clear the alarm.
  • Latching with Reset after Cleared (L-CLEAR): Alarm must be reset manually and can only be done so after the alarm condition has cleared. Press the Enter (ACK) button after the alarm condition has cleared to reset the alarm.

Totalizer Capabilities

Loop Leader flow rate/totalizers can be programmed for a wide variety of totalizer applications. They can display total, grand total, or non-resettable grand total; the rate can be displayed with a time base of seconds, minutes, hours or days. The user can program a totalizer conversion factor, a non-resettable grand total, password protection, and several total reset methods.

8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines

The Loop Leader flow rate/totalizer can be programmed to show eight full digits of total on the bottom display or 13 digits of total using both the top and bottom displays. In both cases, the display can be programmed to include commas to make it easier to read the very large numbers; e.g. 44,987,356

In 13-digit mode, the bottom line shows the least significant digits and the top line shows the most significant digits. The meter is not capable of displaying commas on the top line, so this number is actually 1,211,230,379. The comas can be removed from bottom if desired. See sample on bottom, right.

Totalizer Conversion Factor & Multiplier

The user can enter a totalizer conversion factor that allows the meter to display total in different units than the rate. For instance, a customer could measure flow rate in gallons per minute and total in hundredths of acre-feet. A multiplier may be selected to automatically display the value in kGAL, MGAL, etc.

Totalizer Password Protection

The total and grand total can be password protected so they can be reset only by authorized personnel.

Non-Resettable Grand Total

The user can set up the grand total to be non-resettable by selecting YES for PERMLOCK in the Advanced – Grand Total – Reset menu. Once this is done, the grand total can never be reset.

Remote Total Reset

The total can be reset via an external contact closure on the digital input.

Front Panel Total Reset

The three front panel function keys can be programmed to reset the total and grand total. This makes it possible for the user to reset either the total or the grand total by pressing the appropriate function key. Of course, if the total or grand total is password protected, they will not reset when the function key is pressed unless the password is entered.

Low-Flow Cutoff

The user may program the meter for a low-flow cutoff such that the meter displays zero below this point, regardless of the input value.

Total Alarms

The Loop Leader’s two relays can be set up to alarm when the total reaches a user-defined set point. A variety of reset modes are available and the user can also program time delays and fail-safe operation.

Approvals

All versions of these instruments are CE marked. The hazardous area versions of these instruments are UL and C-UL Listed as intrinsically safe and nonincendive and ATEX and IECEx Certified for Intrinsic Safety in Hazardous Areas (Gas Atmospheres). These versions are also UL and C-UL Listed under the UL 61010-1 General Safety Standard.

One of the most useful aspects of the hazardous area approvals is that these instruments are approved by UL as nonincendive so they can be installed in Division 2 areas with no additional protective devices needed.

General

DisplayFive digits
(-9999 to 99999)
0.70″ (17.8 mm) high, 7-segment,
automatic lead zero blanking.
Seven characters0.4″ (10.2 mm) high, 14-segment.
SymbolsHigh & Low Alarm, Password Lock
Display OrientationDisplay may be mounted at 90° increments up to 270° from default orientation.
Display AssignmentUpper display is assigned to rate and lower display may be assigned to total, tag name/ engineering units, or to alternate between them.
Display Update Rate

Ambient > -25°C: 2 Updates/Second
Ambient < -25°C: 1 Update/5 Seconds

BacklightWhite; Loop-powered or externally powered. Backlight can be enabled or disabled via alternative wiring of terminal block. Loop-powered backlight brightness will increase as the input signal current increases. Externally powered backlight has consistent brightness.
Externally Powered
Backlight
Voltage Range: 9-36 VDC
Supply V  9 VDC  12 VDC  24 VDC  36 VDC
Max Pwr  0.2 W  0.25 W  0.5 W  0.75 W
Display OverrangeDisplay flashes 99999
Display UnderrangeDisplay flashes -9999
Programming MethodFour SafeTouch through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
Noise FilterProgrammable LO, med, HI, or OFF
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.
Advanced FunctionLinear, square root, or programmable exponent
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
EnvironmentalOperating temperature range: -40 to 75°C (-40 to 167°F)
Storage temperature range: -55 to 75°C (-67 to 167°F)
Installation temperature range: -55 to 75°C (-67 to 167°F)
(The display ceases to function below -40°C)
Relative humidity: 0 to 90% non-condensing
Printed circuit boards are conformally coated
ConnectionsScrew terminals accept 12 to 22 AWG wire
MountingMay be mounted directly to conduit. Built-in flange for wall mounting or NPS 1½” to 2½” or DN 40 to 65 mm pipe mounting.
Overall Dimensions5.25″ x 5.65″ x 4.80″
(133 mm x 144 mm x 122 mm)
(W x H x D)
WeightAluminum: 4.8 lbs (2.18 kg)
Stainless Steel: 8.7 lbs (4.3 kg)
Warranty3 years parts and labor

Input

Input4-20 mA
Accuracy±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span.
Temperature Drift50 PPM/°C from -40 to 75°C ambient
Maximum Voltage Drop & Equivalent ResistanceWithout Backlight or with Externally Powered BacklightWith Loop-Powered Backlight
3.0 VDC @ 20 mA6.0 VDC @ 20 mA
150 Ω @ 20 mA300 Ω @ 20 mA
Multi-Point Linearization2 to 32 points
Signal Input ConditioningLinear, square root, programmable exponent
Programmable ExponentUser selectable from 1.0001 to 2.9999 for open channel flow.
Low Flow Cutoff0-99999 (0 disables cutoff function)
Point below at which display always shows zero.
Decimal PointUser selectable decimal point
Minimum SpanInput 1 & Input 2: 0.10 mA
Calibration RangeAn Error message will appear if input 1 and input 2 signals are too close together.
Input Range
4-20 mA
Minimum Span Input 1 & Input 2
0.10 mA
Input OverloadOver current protection to 2 A max.
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/Totalizer

Rate Display0 to 99,999 leading zero blanking
Total Display0 to 9,999,999 leading zero blanking
Total Decimal PointUp to six decimal places or none: d.dddddd, d.ddddd, d.dddd, d.ddd, d.dd, d.d, or ddddddd
Lower Display ConfigurationCan be programmed to display total, tag name/engineering units, or to alternate between them.
TotalizerCalculates total based on rate, time base of second, minute, hour, or day, and field programmable multiplier; stored in non-volatile memory upon power loss.
Totalizer ResetVia front panel SafeTouch button, time delay, external contact closure, or protected
Total Conversion Factor0.000001 to 9,999,999
Totalizer RolloverDisplay rolls over when display exceeds 9,999,999. Relay status reflects the displayed value.
Total Reset DelayProgrammable from 0 to 99,999 seconds

Open Collector Output

RatingIsolated open collector, sinking NPN 30 VDC @ 150 mA max.
Alarm OutputAssign to rate for high or low alarm trip point.
Assign to total for total alarm trip point.
Deadband0-100% FS, user selectable
AcknowledgeFront panel ACK button resets output and screen indication.
Pulse Output Scaler (Count)The pulse output scaler (count) is programmable from 0.0001 to 99999. One pulse is generated for every total increment selected (e.g. A pulse scaler value of 100 will generate one pulse every time the total is incremented by 100 units).
If the pulse output exceeds the programmed output frequency, pulses are accumulated as pending and are not lost. Pulses will continue to output until the buffer is emptied or the total is reset from the front panel.
Pulse Output FrequencyProgrammable frequency: 2, 4, 8, 16, 32, 64, 128 Hz.
Minimum pulse width: 3.9 ms @ 128 Hz
Maximum pulse width: 250 ms @ 2 Hz
Factory default pulse width: 31 ms @ 16 Hz

Enclosure

MaterialAL Models: ASTM A413 LM6 die-cast aluminum, copper-free, enamel coated
SS Models: ASTM A743 CF8M investment-cast 316 stainless steel
Gasket (O-Ring)Fluoroelastomer
RatingNEMA 4X, IP68 Explosion-proof
ColorAL: Blue
SS: Silver
WindowBorosilicate glass
ConduitsPD6820-0K1: Two 3/4″ NPT
PD6820-0K1-M20: Two M20
PD6820-0K1-SS: Two 3/4″ NPT
PD6820-0K1-SS-M20: Two M20
FlangesBuilt-in flange for wall and pipe mounting.
Tamper-Proof SealCover may be secured with tamper-proof seal
Instrument Tag LoopBuilt-in loop for securing stainless steel tag
ATEX & IECEx (ProtEX+ enclosure only)Flame-Proof Protection
II 2GD
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68
Tamb: -55°C to +85°C
Certificate No.: Sira 19ATEX1252U
Certificate No.: IECEx SIR 19.0075U
CSA (ProtEX+ enclosure only)Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Group E, F, G;
Class III
Ex db IIC Gb
Ex tb IIIC Db
Class I, Zone 1, AEx db IIC Gb;
Zone 21, AEx tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate Number: CSA 19.80011200U
UL (ProtEX+ enclosure only)Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Groups E, F, G
Class III;
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate Number: E518920

Note: The above approvals are for the enclosure only. See below for approval on the entire instrument.

Product Ratings & Approvals

CSAExplosion-Proof for use in:
      Class I, Division 1, Groups B, C and D
Dust Ignition-Proof for use in:
      Class II/III, Division 1, Groups E, F and G; T6
Flame-Proof for use in:
      Zone 1, Ex d IIC T6
      Ta = -55 to 75°C
      Enclosure: Type 4X & IP66/IP68
      Certificate Number: CSA 11 2325749
ATEXExplosion-Proof for use in:
       Ex II 2 G D
      Ex db IIC T6 Gb
      Ex tb IIIC T85°C Db IP68
      Ta = -55 to 75°C
      Certificate Number: Sira 10ATEX1116X
IECExExplosion-Proof for use in:
      Ex db IIC T6 Gb
      Ex tb IIIC T85°C Db IP68
      Ta = -55 to 75°C
      Certificate Number: IECEx SIR 10.0056X

Connections

Dimensions

Front View

Side View

Top View

Data Sheet: LDS6820_1 Data Sheets

Instruction Manual: LIM6820_0 Instruction Manuals

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