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PD6720 Field-Mount Loop-Powered Rate/Totalizer 

Instruction Manual 

 

2

 

Disclaimer 

The information contained in this document is 
subject to change without notice. Precision  
Digital Corporation makes no representations 
or warranties with respect to the contents hereof; 
and specifically disclaims any implied warranties 
of merchantability or fitness for a particular 
purpose. 

 

 

Read complete instructions prior to installation 
and operation of the meter. 

 

 

Risk of electric shock or personal injury. 

 

This product is not recommended for life support 
applications or applications where malfunctioning 
could result in personal injury or property loss. 
Anyone using this product for such applications 
does so at his/her own risk. Precision Digital 
Corporation shall not be held liable for damages 
resulting from such improper use. 

 

Failure to follow installation guidelines could 
result in death or serious injury. Make sure only 
qualified personnel perform the installation. 

 

 

WARNING 

Cancer and Reproductive Harm 

www.P65Warnings.ca.gov 

 

 

Limited Warranty 

Precision Digital Corporation warrants this 
product against defects in material or 
workmanship for the specified period under 
“Specifications” from the date of shipment from 
the factory. Precision Digital’s liability under this 
limited warranty shall not exceed the purchase 
value, repair, or replacement of the defective unit. 
See Warranty Information and Terms & 
Conditions on 

www.predig.com

 for complete 

details. 

 

© 2020 Precision Digital Corporation. 
All rights reserved. 
 

Introduction 

The PD6720 is a rugged, field-mount, loop-powered 
rate/totalizer fully featured for demanding applications 
in harsh environmental conditions. The meter derives 
all of its power from the 4-20 mA loop. It is 
programmed using the four SafeTouch 
through-window buttons, without removing the cover, 
and can be scaled with or without a calibration signal. 
The numeric rate display will read up to 99999 and 
the alphanumeric total/tag display will read up to 
9999999. The alphanumeric display can also be 
programmed to show any combination of numbers 
and letters up to seven characters long for use as 
engineering units and/or the process identification tag. 
The backlight lets you see the display under any 
lighting condition and can be powered from either the 
4-20 mA loop or from a separate DC power supply.  
The enclosure is provided with three threaded conduit 
holes and integrated pipe or wall mounting slotted 
flanges. 

Ordering Information 

Model 

Description 

PD6720-0K1 

Field-Mount Loop-Powered 
Rate/Totalizer with Backlight 

Accessories 

Model 

Description 

PDAPLUG75P

 

3/4" NPT Plastic Conduit Plug

 

PDA1024-01

 

24 VDC Power Supply for DIN Rail 

PDA6846

 

Steel 2" U-Bolt Kit. All Material: Zinc 
Plated Steel; (1) U-Bolt for 2" Pipe with 
(2 each) Washers, Lock Washers, and 
Nuts.

 

PDA6846-SS

 

Stainless Steel 2" U-Bolt Kit. All  
Material: Stainless Steel; (1) U-Bolt for 
2" Pipe with (2 each) Washers, Lock 
Washers, and Nuts.

 

PDA-SSTAG

 

Custom Stainless Steel Tag (see 
website for convenient ordering form) 

Summary of Contents for PD6720 Series

Page 1: ...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 SafeTouchTM Thro...

Page 2: ...Terms Conditions on www predig com for complete details 2020 Precision Digital Corporation All rights reserved Introduction The PD6720 is a rugged field mount loop powered rate totalizer fully featur...

Page 3: ...ime Base t base 15 Setting the Total Conversion Factor totCF 15 Manual or Automatic Total Reset Function t rST 16 Setting the Tag Display tag 16 Setting Up the Password PASSWRD 17 Locking the Meter 17...

Page 4: ...Enclosure Dimensions Side Cross Section View 7 Figure 3 Connector Board 8 Figure 4 Connections without Backlight 9 Figure 5 Connections with Loop Powered Backlight 9 Figure 6 Connections with Externa...

Page 5: ...Environmental Operating temperature range 40 to 75 C Storage temperature range 40 to 75 C Relative humidity 0 to 90 non condensing Connections Screw terminals accept 12 to 22 AWG wire Enclosure NEMA...

Page 6: ...able from 0 to 99 999 seconds Open Collector Output Rating Isolated open collector sinking NPN 30 VDC 150 mA max Alarm Output Assign to rate for high or low alarm trip point Assign to total for total...

Page 7: ...and set the display module aside Unpacking Remove the meter from box Inspect the packaging and contents for damage Report damages if any to the carrier If any part is missing or the meter malfunction...

Page 8: ...t from external supply OUTPUT NPN open collector output positive OUTPUT NPN open collector output negative RESET Contact closure alarm acknowledge pull up to 3 VDC RESET Contact closure alarm acknowle...

Page 9: ...ions are made to two terminals labeled RESET Connect to a contact closure source such as a relay or a pushbutton as shown in Figure 7 Figure 7 Reset Connections Open Collector Output Connections Outpu...

Page 10: ...sors are disabled when a mechanical button is pressed and will automatically be re enabled after 60 seconds of inactivity The SafeTouch buttons are designed to filter normal levels of ambient interfer...

Page 11: ...nds to access the Advanced features of the meter Right Reset Button Press the Right arrow button to move to the next digit or decimal position during programming Up Display Button Press the Up arrow b...

Page 12: ...ogram menu sCalE Scale Enter the Scale menu Cal Calibrate Enter the Calibrate menu Inpt1 Input 1 Calibrate input 1 signal or program input 1 value DspL1 Display 1 Program display 1 value Inpt2 Input 2...

Page 13: ...w to select next digit and Up arrow to increment digit The digit being changed blinks Press the Enter button at any time to accept a setting or MENU button to exit without saving changes The decimal p...

Page 14: ...functions are exclusive of each other The meter uses the last function programmed Only one of these methods can be employed at a time The Scale and Calibrate functions can use up to 32 points default...

Page 15: ...complete the calibration or scaling of the meter The minimum span is 0 10 mA If the minimum span is not maintained the meter reverts to input 2 allowing the appropriate input signals to be applied Re...

Page 16: ...on choose man dsabl To reset total upon total alarm set point choose auto enter a time delay t dly and proceed to programming the set point see Alarm Output alrm on page 19 Press the Enter button at a...

Page 17: ...returns to its password protected condition Disabling Password Protection To disable the password protection access the Password menu and enter the correct password twice as shown below The meter is n...

Page 18: ...total Set Set Point Program set point Reset Reset Point Program reset point Pulse Pulse Output Program pulse output Scaler Count MAX HZ Frequency Program pulse output maximum frequency Funct Function...

Page 19: ...deadband is one display count If set and reset points are programmed the same output will reset one count below set point Total alarm trip point program total set point Alarm reset is triggered by tot...

Page 20: ...rent source instead of using input scaling This process will override previously programmed scaling points Apply a live signal using a known accurate signal source InP 1 32 and then enter the correspo...

Page 21: ...ging time and so the longer the display may take to find its final value The filter contains a noise filter bypass feature so that while small variations in the signal will be filtered out large abrup...

Page 22: ...he factory defaults Instructions to load factory defaults Enter the Advanced features menu Press and hold Reset button when INFO is shown Press Enter when RESET DFALTS prompt is shown Note If Enter is...

Page 23: ...exit Max Min display readings Display response is too slow Check filter setting to see if it can be lowered to LO or OFF If the display locks up or the meter does not respond at all Perform hard rese...

Page 24: ...on or increment digit Cycle through maximum minimum and mA display mode ENTER Accept selection value and move to next selection Acknowledge alarms Max Min Mode While in Run Mode pressing Up Arrow will...

Page 25: ...990 www predig com LIM6720_C SFT049 Ver 1 200 up 07 20 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 34...

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