PRECISION DIGITAL PD6720 Series Instruction Manual

Field-mount loop-powered rate/totalizer

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PD6720 Field-Mount Loop-Powered Rate/Totalizer

Instruction Manual

• NEMA 4X, IP66 Loop-Powered Field-Mount Rate/Totalizer

• 4-20 mA Input with ±0.03% Accuracy

• 3.0 Volt Drop (6.0 Volt Drop with Backlight)

• Easy Field Scaling in Engineering Units without Applying an Input

• 0.7" (17.8 mm) 5 Digits Upper Display for Rate

• 0.4" (10.2 mm) 7 Alphanumeric Characters Lower Display for Total, Tag, or Units

• Simultaneous 5-Digit Rate and 7-Digit Total Display

• Rate in Units per Second, Minute, Hour, or Day

• Display Open Channel Flow with Programmable Exponent Feature

• Open Collector Pulse or Alarm Output

• Display Mountable at 0°, 90°, 180°, & 270°

• SafeTouch

Through-Window Button Programming

• HART

Protocol Transparent

• Loop or External DC-Powered Backlight Standard

• Operating Temperature Range: -40 to 75°C (-40 to 167°F)

• Conformal Coated PCBs for Dust and Humidity Protection

• Password Protection for Programming Only

• 32-Point Linearization, Square Root Extraction and Programable Exponent Function

• Wide Viewing Angle

• Flanges for Wall or Pipe Mounting

• Plastic NEMA 4X, IP66 Enclosure

• Three 3/4" NPT Threaded Conduit Openings (Two Plugs Installed)

• Stainless Steel Tag Available

• 2" U-Bolt Kits Available

• 3-Year Warranty

PRECISION DIGITAL CORPORATION

233 South Street • Hopkinton MA 01748 USA

Tel (800) 343-1001 • Fax (508) 655-8990

www.predig.com

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Summary of Contents for PRECISION DIGITAL PD6720 Series

Page 1 • Three 3/4" NPT Threaded Conduit Openings (Two Plugs Installed) • Stainless Steel Tag Available • 2" U-Bolt Kits Available • 3-Year Warranty PRECISION DIGITAL CORPORATION 233 South Street • Hopkinton MA 01748 USA Tel (800) 343-1001 • Fax (508) 655-8990 www.predig.com...
Page 2 Anyone using this product for such applications flanges. does so at his/her own risk. Precision Digital Corporation shall not be held liable for damages Ordering Information resulting from such improper use.
Page 3 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Table of Contents Introduction ......................2 Ordering Information ................... 2 Specifications....................... 5 General ......................5 Input ........................5 Rate/Totalizer ....................6 Open Collector Output ..................6 Safety Information ....................7 Installation ......................7 Unpacking ......................7 Pre-Installed Conduit Plug ................
Page 4 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Table of Figures Figure 1. Enclosure Dimensions – Front View ............ 7 Figure 2. Enclosure Dimensions – Side Cross Section View ......7 Figure 3. Connector Board..................8 Figure 4. Connections without Backlight ............9 Figure 5.
Page 5 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Specifications Input Input 4-20 mA Except where noted all specifications apply to operation at +25°C. Accuracy ±0.03% of calibrated span ±1 count, General square root & programmable exponent Display Five digits 0.70" (17.8 mm) high, accuracy range: (-9999 to 7-segment, automatic lead zero...
Page 6 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Rate/Totalizer Open Collector Output Rate Display 0 to 99,999 leading zero blanking Rating Isolated open collector, sinking NPN Total Display 0 to 9,999,999 leading zero blanking 30 VDC @ 150 mA max. Total Decimal Up to six decimal places or none: Alarm Output Assign to rate for high or low alarm trip...
Page 7 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Safety Information Mounting The PD6720 has two slotted mounting flanges that may be used for pipe mounting or wall mounting. • Read complete instructions prior to installation Alternatively, the unit may be supported by the and operation of the meter.
Page 8 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Connections • Observe all safety regulations. Electrical wiring To access the connectors, remove the enclosure should be performed in accordance with all cover and unscrew the two captive screws that fasten agency requirements and applicable national, the display module.
Page 9 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual External Reset Connection Wiring Diagrams External reset connections are made to two terminals Signal connections are made to a four-terminal labeled RESET. Connect to a contact closure source connector mounted in the base of the enclosure per such as a relay or a pushbutton as shown in Figure 7.
Page 10 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Setup and Programming SafeTouch Button Tips and Troubleshooting There is no need to recalibrate the meter for The SafeTouch buttons are designed to filter normal milliamps when first received from the factory. levels of ambient interference and to protect against false triggering, however, it is recommended that the The meter is factory calibrated for milliamps prior SafeTouch buttons be disabled (slide switch to LOCK)
Page 11 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Buttons and Display Menu Button • Press the Menu button to enter or exit the Programming Mode at any time. • Press and hold the Menu button for five seconds to access the Advanced features of the meter. Right / Reset Button •...
Page 12 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Main Menu Display Functions & Display Parameter Action/Setting Messages SETUP Setup Enter Setup menu The meter displays various functions and messages DeC. . p t Decimal point Enter Decimal Point menu during setup, programming, and operation. The table in the right column shows the main menu functions Rate Rate decimal...
Page 13 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Setting the Decimal Point (dec. P T) Setting Up the Meter (SETUP) Rate decimal point may be set with up to four decimal The Setup menu is used to select: places or with no decimal point at all. Total decimal Rate and total decimal point position point may be set with up to six decimal places or with Program menu...
Page 14 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Programming the Meter (Prog) Scaling the Meter (SCale) The meter may either be scaled (SCALE) without The 4-20 mA input can be scaled to display the applying an input or calibrated (Cal) by applying an process in engineering units.
Page 15 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Calibrating the Meter (Cal) Minimum Input Span The minimum input span is the minimum difference To scale the meter without a signal source refer to Scaling the Meter (SCale). between input 1 and input 2 signals required to complete the calibration or scaling of the meter.
Page 16 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual rate in gallons and total in liters, enter a conversion Setting the Tag Display (tag) factor of 3. 7 854. When rate and total units are the The meter can be set to display a combination of same, the Conversion Factor should be 1.
Page 17 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Setting Up the Password (PASSWRD) Disabling Password Protection The Password menu is used to program a five-digit To disable the password protection, access the password to prevent unauthorized changes to the Password menu and enter the correct password programmed parameter settings.
Page 18 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Advanced Features Menu & Advanced Features Menu Display Messages To simplify the setup process, functions not needed The following table shows the Advanced features for most applications are located in the Advanced menu functions and messages in the order they features menu.
Page 19 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Alarm & Pulse Output (OUTPUT) Pulse Output Scaler (count) The PD6720 is equipped with an NPN open collector The pulse output scaler (count) corresponds to the output that may be set up for high or low rate alarm total units (e.g.
Page 20 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Advanced Function Selection Multi-Point Calibration (CAL) (FUNCTN) The meter can be calibrated using a current source instead of using input scaling. This process will The Advanced Function menu is used to select the override previously programmed scaling points. advanced function to be applied to the input: linear, Apply a live signal using a known accurate signal square root, programmable exponent, or round...
Page 21 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Programmable Exponent Input Signal Filter (FILTER) Linearization (Prog. E ) The noise filter is available for unusually noisy signals that cause an unstable process variable display. The The programmable exponent can be used to linearize noise filter averages the input signal over a certain the signal from level transmitters in open-channel flow period.
Page 22 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Operation Reset Meter to Factory Defaults Front Panel Buttons Operation When the parameters have been changed in a way that is difficult to determine what’s happening, it might be better to start the setup process from the factory Button Description defaults.
Page 23 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Troubleshooting Due to the many features and functions of the meter, it’s possible that the setup of the meter does not agree with what an operator expects to see. If the meter is not working as expected, refer to the Diagnostics menu and consult the recommendations described below.
Page 24 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Quick User Interface Reference Pushbutton Function MENU Go to programming mode or leave programming. Hold for 5 seconds to enter Advanced Features menu directly. RIGHT Move to next digit. Go to Arrow previous menu or alphanumeric character selection.
Page 25 PD6720 Field-Mount Loop-Powered Rate/Totalizer Instruction Manual Contact Precision Digital Technical Support Call: (800) 610-5239 or (508) 655-7300 Fax: (508) 655-8990 Email: support@predig.com Sales Support Call: (800) 343-1001 or (508) 655-7300 Fax: (508) 655-8990 Email: sales@predig.com Place Orders Email: orders@predig.com For the latest version of this manual please visit www.predig.com...

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Pd6720-0k1