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Test & Measurement
Instruments
PD6620 Loop Leader Loop-Powered Rate/ Totalizer
The Loop Leader PD6620 is a loop-powered, 1/8 DIN flow rate/totalizer designed for demanding process control applications. The four front panel buttons make setup and programming of the meter simple and intuitive. A dual-line display featuring five digits on the top line and eight digits on the bottom line, preprogrammed engineering units, and optional bargraph display (PD6624) provide a clear and attractive presentation of the process. The units of measure can be changed as needed (e.g. gallons/second to liters/second) without the need to re-scale the meter.
The dual-line display can be customized by the user to operate in such a way as to satisfy a specific application. Typically, the top line is used for the rate while the bottom line is used for the total, grand total, or engineering units. Three programmable function keys and a digital input come standard and allow the meter to be customized for use in specialized applications.
All models come equipped with two open collector outputs and are available with two solid state relays and a 4-20 mA analog output. These outputs can be programmed for alarm indication, signal retransmission via pulse or analog signal, pump control, and a number of other useful features.
The fact that this meter is loop-powered means that there is no need to run additional, costly power lines; the meter gets all of the power it needs from the 4-20 mA loop. The Loop Leader loop-powered rate/totalizer is built in a shallow-depth case with a NEMA 4X/IP65 front and features loop-powered backlighting and a wide -40 to 167°F (-40 to 75°C) operating temperature range. It doesn’t matter if it’s indoors or outdoors, in bright sunlight or a dimly lit plant, or in an area that is wet, dirty, hot, or cold, the Loop Leader can go just about anywhere.
Features
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Specifications & Spare Parts
Except where noted all specifications apply to operation at +25°C.
General
| Display | Top: 0.7” (17.8 mm), Bottom: 0.4” (10.2 mm); 14-segment alphanumeric
Top: 5 digits -9999 to 99999 Bottom: 8 digits -9,999,999 to 99,999,999 Bottom line separated by commas |
| Display Update Rate |
Ambient > -10°C: 1 Update/Second
Ambient > -20°C: 1 Update/2 Seconds Ambient -40°C: 1 Update/10 Seconds |
| Overrange | Top: 99999; Bottom: 99,999,999 (flashing) |
| Underrange | Top: -9999; Bottom: -9,999,999 (flashing) |
| Programming Method | Front panel |
| Noise Filter | 1, 2, 4, 8, 16 sec. |
| Noise Filter Bypass | 0.1 to 99.9% FS |
| 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 | Programmable password restricts modification of programmed settings. |
| Non-Volatile Memory | 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 |
| Environmental | Operating temperature range: -40 to 75°C Storage temperature range: -40 to 85°C Relative humidity: 0 to 90% non-condensing |
| Connections | Removable screw terminals accept 12 to 22 AWG wire |
| DI Digital Input Contacts | 2.1 VDC on contact. Connect normally open contacts across DI+ to DI- |
| DI Digital Input Logic Levels | Logic High: 2.4 to 30 VDC (max)
Logic Low: 0 to 0.9 VDC |
| Enclosure & Materials |
1/8 DIN, 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; Color: black |
| Mounting | 1/8 DIN panel cutout required. Two panel mounting bracket assemblies provided |
| 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) w/ option board |
| Warranty | 3 years parts and labor |
Process Input
| Accuracy | ±0.02% of span ±1 count, Square root and programmable exponent: 10-100% FS |
| Function | Linear, square root, or programmable exponent |
| Low-Flow Cutoff | 0.0 to 999,999.9 |
| Temperature Drift | 25 PPM/°C from -40 to 75°C ambient |
| Decimal Point | Up to four decimal places: On top
Up to seven decimal places: On bottom |
| Scaling and Display Range | Input: 4-20 mA
Scaling Range: -999,999.9 to 999,999.9 Display Range: Top Line: -9999 to 99999; Bottom Line: -9,999,999 to 99,999,999 |
| Voltage Drop | With backlight off: 1.5 V max
With backlight on: 4.5 V max |
| 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 |
Rate/Totalizer
| Rate Display Indication | -9999 to 99999, top display -9,999,999 to 99,999,999, bottom display |
| Total Display & Total Overflow | -9999 to 99999, top display -9,999,999 to 99,999,999, bottom display “T” LCD segment shows while displaying total “G T” LCD segments show for grand total. (non-bargraph display version only) |
| 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. |
| 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 Reset | Via front panel button or external contact closure on digital input |
| Total Reset Password | Total and grand total passwords may be entered to prevent resetting the total or grand total from the front panel. |
| Non-Resettable Total | Total and grand total reset may be disabled through the meter interface |
Open Collector Output
| Rating | Two NPN, Isolated open collector, 30 VDC @ 90 mA maximum |
| Output Assignment | Pulse, Alarm, Timer, Total Reset, or Disable |
| Pulse Output Source | Rate, Total, Grand Total, or Test Frequency |
| Pulse Output Factor | 0.000001 to 999,999.9 |
| Pulse Width | 2 ms; 50% duty cycle |
| Pulse Output Frequency |
250 Hz maximum 0.1 Hz minimum |
| Quadrature Pulse Output | Available for Output 2 (90° behind Output 1) |
| Alarm Output Source | Assign to Rate, Total, Grand Total or Digital Input |
| 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 output |
| Alarm Operation | Auto, Auto-man, Latch, Latch w/clear |
| Alarm Indication | Red backlight, Flashing display, Alarm Message, Alarm symbol (!) |
| Alarm Message | On or Off; User programmable, 8 characters maximum
Displayed every 10 sec for 1 sec on bottom |
| Alarm Acknowledge | Front panel ACK button or external digital input resets output and screen indication |
| Auto Initialization | When power is applied to the meter, 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) |
| Timer Start/Stop | Front panel or digital input, user se-lectable |
Solid State Relays
| Rating | Resistive Load: 250 VAC/DC @ 1 Amp
Inductive Load: 1/10 HP @ 125/250 VAC/DC |
| Noise Suppression |
Metal oxide varistors across outputs |
| Relay Assignment |
Alarm, Pump Control, Timer, or Disable
Pump Alternation Time: 0 to 999:59 (hrs:min) |
| Alarm Output Source | Assign to Rate, Total, Grand Total, or Digital Input |
| 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 relay |
| Alarm Operation | Auto, Auto-man, Latch, Latch w/clear |
| Timer Start/Stop | Front panel or digital input, user se-lectable |
4-20 mA Transmitter Output
| 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 |
| Accuracy | ±0.05% FS ±0.001mA |
| 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; 10-1100 Ω @ 30 VDC |
