Precision Digital PD6620 is a versatile and reliable instrument designed for flow rate and total display in various industrial applications. With its intrinsically safe and non-incendive features, this loop-powered 1/8 DIN (92 x 45 mm) flow rate/totalizer can be conveniently installed anywhere, providing comprehensive and informative data from a 4-20 mA signal.
One of the standout features of the PD6620 is its ability to simultaneously display both flow rate and total. The top line, equipped with a 5-digit alphanumeric display, typically shows the flow rate, while the bottom line, featuring an 8-digit alphanumeric display, showcases the flow total or grand total. These lines utilize 14-segment, alphanumeric characters, ensuring clear indication of tags, units, or alarm messages. Additionally, the PD6624/6 models offer a 20-segment bar graph that visually represents the percentage, accompanied by a numeric value.
Installation of the PD6620 is hassle-free, as it derives power from the 4-20 mA loop, eliminating the need for a separate power source. With a minimal voltage drop of only 1.5 V (4.7 V with backlight), the PD6620 adds little burden to the loop. The instrument features a rugged NEMA 4X, IP65 front panel, making it suitable for various environments, with an operating temperature range of -40 to 158°F (-40 to 70°C). The conformally coated PCBs ensure durability, and the backlit LCD enables easy reading in bright sunlight or dimly lit areas. Moreover, the PD6620 is intrinsically safe and non-incendive, making it suitable for installation in hazardous areas.
For programming and setup, users have the option to connect the meter to a PC via a micro USB cable and utilize the provided software. Alternatively, programming, setup, and operation can be performed directly on the meter using the four front panel buttons, three of which can be assigned as function keys. Additionally, the PD6620 includes a digital input that is particularly useful for remote reset of the total or controlling timer/batch start/stop functions.
The PD6620 offers flexible output options, including two open collector outputs, two solid-state relays, and a 4-20 mA analog output. The open collector outputs can be used for alarm indication or sending pulses when a specific total value is reached. The relays can be programmed for alarm indication, on/off control, sample taking, or simple batch control, providing further versatility to the instrument.
Experience the reliability and convenience of the Precision Digital PD6620, with its advanced features and comprehensive functionality, ideal for flow rate and total monitoring in industrial applications.
Specifications
Except where noted all specifications apply to operation at +25°C.
Input
Input: 4-20 mA
Accuracy: ±0.02% of span ±1 count, Square root and programmable exponent: 10-100% FS
Voltage Drop: Without backlight: 1.5 V maximum,
With backlight: 4.7 V maximum
Equivalent Resistance: With backlight off: 75 Ω @ 20 mA
With backlight on: 225 Ω @ 20 mA
Input Overload: Over current protection to 1 A maximum
Temperature Drift: 25 PPM/°C from -40 to 75°C ambient
Function: Linear, square root, or programmable exponent
Low-Flow Cutoff: 0.0 to 999,999.9
HART Transparency: Analog input will not interfere with existing HART communications on the wired 4-20 mA signal
Display
Display: Dual-line LCD with backlight. Both lines 14-segment alphanumeric. Top: 0.7″ (17.8 mm), Bottom: 0.4″ (10.2 mm). Display may be programmed to turn red and flash a user-defined message on alarm condition.
Backlight: Powered by 4-20 mA loop. Intensity varies with signal level
PD6622 & PD6626:
Top line: 5 digits (-9999 to 99999) or 5 characters (all capital & most lower case letters)
Bottom line: 8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters (all capital & most lower case letters)
PD6624 & PD6628:
Top line: 5 digits (-9999 to 99999) or 5 characters (all capital & most lower case letters)
Bottom line: 8 digits (-9,999,999 to 99,999,999; separated by commas) or 8 characters (all capital & most lower case letters)
Bargraph: 20 segments, numeric percent indication at top
Decimal Point & Commas
Top line: Up to four decimal places
Bottom line: Up to seven decimal places and commas to indicate 1000s (i.e. 88,987,628)
Dual-Scale Feature: The input can be displayed in different scales on the top and bottom lines. For instance, the top line could display the flow in GPM and the bottom line could display that same input in CFM.
Alarm Indication: Red backlight, flashing display, alarm symbol (!); Symbols are not available on bargraph skus.
Alarm Message: On or Off; user programmable, 8 characters maximum. Displayed every 10 seconds for 1 second on bottom line.
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
Environmental: Operating temperature range:
-40 to 75°C for safe area products
-40 to 70°C for hazardous area products
Storage temperature range: -40 to 85°C
Relative humidity: 0 to 90% non-condensing. Printed circuit boards are conformally coated.
Programming Method: Front panel & Free PC-based USB programming software
Enclosure & Materials: Enclosure: 1/8 DIN, IP65, NEMA 4X front panel, high impact plastic, NORYL® polyphenylene ether & polystyrene blend (PPE PS) resin, UL 94V-0, Color: gray, Gasket: silicone rubber, Faceplate: LEXAN® polycarbonate (PC) film, Buttons: silicone rubber
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.
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.
Password: There are three password types available: 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: All programmed settings and total and grand total values 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.
DI Digital Input Contacts: 2.1 VDC on contact. Connect normally open contacts across DI+ and DI
DI Digital Input Logic Levels: Logic High: 2.4 to 30 VDC (max)
Logic Low: 0 to 0.9 VDC
Tightening Torque: Screw terminal connectors: 4.5 lb-in (0.5 Nm)
Mounting screws: 8.0 lb-in max. (0.9 Nm)
Overall Dimensions: 4.68″x 2.45″x 3.79″ (119 mm x 62 mm x 96 mm) (W x H x D)
Weight: 8.7 oz (247g) with option board
Warranty: 3 years parts and labor
Rate/Totalizer
Rate Display Capability: Top display: -9999 to 99999; bottom display: -9,999,999 to 99,999,999 (with commas)
Total Display Capability: Top display: -9999 to 99999; bottom display -9,999,999 to 99,999,999 (with commas)
Grand Total Display Capability: Top display: N/A; bottom display -9,999,999 to 99,999,999 (with commas)
13-Digit Total & Grand Total Capability: Up to 9,999,999,999,999 using both lines with 13-digit total feature enabled.
Total & Grand Total Indication: On bottom display; “T” indicates total and “GT” indicates grand total. (not available on bargraph skus)
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 or external contact closure on digital input
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.
Caution: Once the Grand Total has been programmed as “non-resettable” the feature cannot be disabled
Common Open Collector & Relay (Alarm) Specifications
High or Low Alarm: User programmable for high or low alarm
Alarm Deadband: 0-100% FS, user programmable
On & Off Time Delay: 0 to 9,999 seconds
Fail-Safe Operation: Independent for each open collector and relay
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: Red backlight, flashing display, alarm symbol (!) (symbols not available on bargraph skus)
Alarm Message: On or Off; User programmable, 8 characters maximum. Displayed every 10 seconds for 1 second on bottom line
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: Two NPN, Isolated open collector, 30 VDC @ 150 mA max
Output Assignment: Pulse, Alarm, Timer, Total Reset, Stopwatch on/off, or Disable
Pulse Output Source: Rate, Total, Grand Total, or Test Frequency
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)
Alarm Output Source: Assign to Rate, Total, Grand Total or Digital Input
Solid State Relays
Rating: Resistive Load: 250 VAC/DC @ 1 A
Inductive Load: 75 VA @ 0.6 A, 250 VAC/DC max (Safe Area only)
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
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: 7.0 VDC to 30.0 VDC maximum
Output Loop Resistance: 10-750 Ω @ 24 VDC; 100-1100 Ω @ 30 VDC
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 dual-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.
Hazardous Area Approvals
ATEX: II 1G, Ex ia IIC T4 Ga, Ta = -40°C to +70°C
Certificate number: CML 17ATEX2015X
IECEx: Ex ia IIC T4 Ga, Tamb = -40°C to +70°C
Certificate number: IECEx CML 17.0008X
UL & C-UL Listed as Intrinsically Safe and Nonincendive:
Class I, Division 1, Groups A, B, C and D T4,
Class I, Division 2, Groups A, B, C and D T4
Ex ia IIC T4 (Canada); Class I Zone 0, Zone 1
AEx ia IIC T4 (U.S.)
Class I Zone 2, Group IIC T4 (U.S.)
PROCESS CONTROL EQUIPMENT FOR USE IN HAZARDOUS LOCATIONS
UL & C-UL 61010 Listed for Electrical Safety and Type 4X Environmental:
Standards for Safety:
IEC 61010-1:2010 (3rd Edition);
UL 61010-1, 3rd Edition;
CAN/CSA-C22.2 No. 61010-1-12, 3rd Edition;
Additional Standards:
UL 50E
Free Meterview XL PC-Based Programming Software
The main screen displays an image of the connected meter and includes various information about this meter, such as sku number, readings, and status.
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. This software greatly simplifies the programming process and also allows the user to save configuration files for later use. The meter will also be powered by the USB connection so no additional power is needed during programming.
- Free
- Easiest Way to Program Your Loop Leader
- Convenient USB Connection
- Meter Powered by USB Connection During Programming
- Save & Print Configuration Files without Meter Connected
- Micro USB Cable Provided
Mounting Dimensions
Notes:
- Panel cutout required: 1.772″ x 3.622″ (45mm x 92mm)
- Panel thickness: 0.040 – 0.250″ (1.0mm – 6.4mm)
- Mounting brackets lock in place for easy mounting
- Clearance: Allow 6″ (152 mm) behind the panel
Applications
Open Channel Flow
The PD6622/24, in combination with an ultrasonic level transmitter, makes for an economical way to measure and display open channel flow rate and total in most weirs and flumes and take periodic samples.
Differential Pressure Flow
The PD6622/24 can display flow rate and total by extracting the square root from the 4-20 mA signal from a differential pressure transmitter. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value.
- Display Flow Rate
- User Selectable Low-Flow Cutoff
- Only 2 Calibration Points Required
Batch Control
The Loop Leader, when ordered with the two solid state relays, can be used as a simple, one or two-stage batch controller. The user enters a preset and preclose value and sets the Loop Leader to either count up or count down. The top display will show the total and the bottom display will show the preset batch amount. The function keys are automatically changed so that F1 starts a batch, F2 opens the preset menu to allow the preset value to be changed, and F3 pauses/stops the currently running batch. Batching can be either automatic or manual.
The following shows the Loop Leader performing a manual batch operation:
System Setup
Both valves are closed with an empty barrel in place. The batched total is displayed in the top display, the preset is selected for the bottom display.
Batch Start
The START button (F1) is pressed. Both valves open. The barrel begins to fill.
Preclose Valve
When the batch total reaches a value of 50.00 (Preset [55.00] – Preclose [5.00]) the full-flow valve closes. The fill rate of the tank slows as a result.
Completed Batch
When the batch total equals the preset amount, the restricted flow valve closes. The barrel is now full.
Change Preset
After placing a new, empty barrel, a new preset fill amount may be selected with the Batch key (F2), while the process is stopped.
Begin New Batch
Press the START key (F1) and a new batch will begin. With both valves open, the process continues.
Pause/Stop
At any time, the STOP button (F3) may be pressed, once to Pause the process, or twice to cancel the batch, which stops the process.
Timer Function
Application Timers are used in everyday life; one of the most common examples is the microwave oven. Industrial timers are used in process control applications where certain events or actions need to be controlled by time. Examples include automatic and batch control applications, where the relay needs to be energized for a specific length of time.
The timer fuction is available on the open collector and relay outputs; which means that you can have up to four timers per meter. The start and stop actions can be triggered from the setup menu or by the function keys and digital input. The meter can be setup to display the off/on timer count down.
There are two modes of operation:
- Continuous Timer (Interval)
At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The cycle repeats until the user stops the timer either from the menu or a function key. - One-Shot Timer
At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The timer stops and the cycle does not repeat.
- A sensor detects the bottle is in place and triggers the digital input to start the timer
- The timer output controls the filling pump
- The On Time is set according to the time needed to fill the bottle
