PRECISION DIGITAL Loop Leader PD683 User manual

PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
PD683 & PD688
LOOP-POWERED METERS
Instruction Manual
•2 V drop (5.7 V with backlight)
•5-Digit LCD, 0.6" (15.2 mm) High
•Custom Engineering Units
•20-Segment Bargraph Display
•Type 4X, NEMA 4X, IP65 Front
•Maximum & Minimum Display
•Linear, Square Root, or Programmable Exponent
•Non-Volatile Memory – No Battery Needed
Loop-
Powered
Backlight
Standard!
PD688 only

PD683 & PD688 Loop-Powered Meters Instruction Manual
2
Disclaimer
The information contained in this document is subject to change
without notice. Precision Digital makes no representations or war-
ranties with respect to the contents hereof, and specifically disclaims
any implied warranties of merchantability or fitness for a particular
purpose.
Registered Trademarks
NORYL®and LEXAN®are registered trademarks of SABIC Innova-
tive Plastics. All other trademarks mentioned in this document are
the property of their respective owners.
© 2016 Precision Digital Corporation. All rights reserved.

PD683 & PD688 Loop-Powered Meters Instruction Manual
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INTRODUCTION
The PD688 is an intrinsically safe and non-incendive loop-powered meter
approved for hazardous area locations. The PD683 is a general-purpose
loop-powered meter for safe area applications. The four front panel but-
tons make the setup and programming an easy task. Five digits, bar-
graph, engineering units, and trend arrows provide a clear and attractive
presentation of the process.
The square root and programmable exponent functions allow for condi-
tioning of signals from non-linear transmitters without adding external
components to the system and the convenience of scaling without a cali-
brated signal source make the PD683 & PD688 the ideal choice for pro-
cess display applications.
ORDERING INFORMATION
Model Description
PD683-0K0* Loop-Powered Panel Meter for Safe Area
PD684-0K1 Loop-Powered Rate/Totalizer for Safe Area
PD688-0K0* ATEX/FM/CSA Approved Loop-Powered Panel Meter
PD689-0K1 ATEX/FM/CSA Approved Loop-Powered Rate/Totalizer
Enclosures and Accessories
Model Meters Description Mounting
PDA2407 1 Plastic NEMA 4X Enclosure Inside Cover
PDA2410 3 Plastic NEMA 4X Enclosure Inside Cover
PDA2411 2 Plastic NEMA 4X Enclosure Inside Cover
PDA23XX 1-10 Economical Plastic NEMA 4X Enclosure Through Door
PDA25XX 1-10 Plastic NEMA 4X Enclosure Through Door
PDA26XX 1-6 Stainless Steel NEMA 4X Enclosure Through Door
PDA27XX 1-6 Steel NEMA 4 Enclosure Through Door
PDA2801* 1 Low-Cost Plastic NEMA 4X Enclosure Through Cover
PDA2812 2 Low-Cost Plastic NEMA 4X Enclosure Through Cover
Note: XX = the last two digits of the model number.
Go to www.predig.com to find individual part numbers.
* Quick Shipment Program product, typically shipped within 2 working days

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Table of Contents
INTRODUCTION ------------------------------------------------------------ 3
ORDERING INFORMATION --------------------------------------------- 3
SPECIFICATIONS---------------------------------------------------------- 6
General-------------------------------------------------------------------------------6
Input----------------------------------------------------------------------------------- 7
PD688 COMPLIANCE INFORMATION ------------------------------- 8
Ratings and Approvals ---------------------------------------------------------8
SAFETY INFORMATION ------------------------------------------------- 8
INSTALLATION ------------------------------------------------------------- 9
Unpacking--------------------------------------------------------------------------- 9
Panel Mounting--------------------------------------------------------------------9
Wiring Connections------------------------------------------------------------ 10
4-20 mA Input Connections ------------------------------------------------ 11
SETUP AND PROGRAMMING ----------------------------------------12
Front Panel Buttons & Status Indicators ------------------------------- 13
Main Menu Display Functions & Messages---------------------------- 14
Main Menu ------------------------------------------------------------------------ 15
Setting Numeric Values ------------------------------------------------------ 15
Setting Up the Meter (setup)------------------------------------------------ 16
Setting the Decimal Point (deC.pt) --------------------------------------- 16
Setting the Units Display (units)----------------------------------------- 17
Programming the Meter (prog)--------------------------------------------- 18
Scaling the Meter (sCalE) -------------------------------------------------- 19
Calibrating the Meter (Cal)------------------------------------------------- 20
Recalibrating the Internal Calibration Reference (ICal)------------ 20
Setting Up the Bargraph (GrapH) ----------------------------------------- 21
Setting Up the Password (pass) ------------------------------------------- 22
Locking the Meter ------------------------------------------------------------ 22
Unlocking the Meter---------------------------------------------------------- 23
Advanced Features Menu---------------------------------------------------- 24
Advanced Features Menu & Display Messages ---------------------- 25
Math Functions (lnear, Squar, Prog.E, Cutof)----------------------- 26
Contrast (contr) -------------------------------------------------------------- 27
Noise Filter (fltEr) ---------------------------------------------------------- 27
Noise Filter Bypass (bypAs) ----------------------------------------------- 27
Internal Calibration (ICal)-------------------------------------------------- 28
Information Menu (info)---------------------------------------------------- 29

PD683 & PD688 Loop-Powered Meters Instruction Manual
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OPERATION ----------------------------------------------------------------30
Front Panel Buttons Operation -------------------------------------------- 30
Maximum & Minimum Readings (Max& MiN) --------------------------- 31
MOUNTING DIMENSIONS ----------------------------------------------32
Reset Meter to Factory Defaults ------------------------------------------- 33
Factory Defaults & User Settings----------------------------------------- 34
TROUBLESHOOTING----------------------------------------------------35
Troubleshooting Tips --------------------------------------------------------- 35
QUICK USER INTERFACE REFERENCE GUIDE----------------36
EU DECLARATION OF CONFORMITY FOR PD688 ------------38
EU DECLARATION OF CONFORMITY FOR PD683 ------------39
Table of Figures
Figure 1. Panel Cutout and Mounting................................................. 9
Figure 2. PD683 & PD688 Rear View.................................................10
Figure 3. PD683 Input Connections with Backlight.........................11
Figure 4. PD683 Input Connections without Backlight ................... 11
Figure 5. Meter Dimensions – Side View .......................................... 32
Figure 6. Case Dimensions – Top View ............................................32

PD683 & PD688 Loop-Powered Meters Instruction Manual
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SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY Five digits
(-99999 to 99999)
0.60" (15.2 mm) high, 7-segment, au-
tomatic lead zero blanking.
Four characters
(Engineering Units)
0.25" (6.4 mm) high, 14 segment.
Bargraph 20-segment, 0% to 100% indication.
Trend arrows Up and down trend indication.
Backlight Orange (intensity varies with signal)
DISPLAY
UPDATE RATE
1 update/second
OVERRANGE Display flashes 99999
UNDERRANGE Display flashes -99999
PROGRAMMING
METHOD
Four front panel buttons
NOISE FILTER Programmable from 1 to 199
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: -30 to 65°C (-40°C allowed)*
Storage temperature range: -40 to 65°C
Relative humidity: 0 to 90% non-condensing
*Below -30°C, the LCD becomes less readable.
CONNECTIONS Removable screw terminals accept 12 to 22 AWG wire
ENCLOSURE &
MATERIALS
1/8 DIN, high impact plastic, UL 94V-0, color: gray
NORYL® Polyphenylene Ether & Polystyrene blend (PPE
PS) Resin
LEXAN® Polycarbonate (PC) Film

PD683 & PD688 Loop-Powered Meters Instruction Manual
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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 5.7 oz (162 g)
WARRANTY 3 years parts and labor
EXTENDED
WARRANTY
1 or 2 years, refer to Price List for details
Input
ACCURACY ±0.03% of span ±1 count,
square root and programmable exponent: 10-100% FS
FUNCTION Linear, square root, or programmable exponent
LOW-FLOW
CUTOFF
-99999 to 99999 (-99999 disables cutoff function)
TEMPERATURE
DRIFT
50 PPM/°C from -40 to 65°C ambient
DECIMAL POINT Up to four decimal places:
d.dddd, dd.ddd, ddd.dd,dddd.d,or ddddd
CALIBRATION
RANGE
An Error message will appear if input 1 and input 2 signals
are too close together.
Input
Range
Minimum Span
Input 1 & Input 2
4-20 mA 0.40 mA
VOLTAGE DROP Without Backlight With Backlight
2.0 V maximum 5.7 V maximum
EQUIVALENT RE-
SISTANCE
100 Ω@ 20 mA 285 Ω@ 20 mA
INPUT
OVERLOAD
Over current protection to 2 A max.

PD683 & PD688 Loop-Powered Meters Instruction Manual
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PD688 COMPLIANCE INFORMATION
Ratings and Approvals
FM & CSA Certified as intrinsically safe with entity for use in:
Class I, Div 1, 2, Groups ABCD
Class II, Div 1, Groups EFG
Class II, Div 2, Groups FG
Class III, Div 1, 2
Class 1, Zone 0, Group IIC
Non-incendive: Suitable for use in Class I, Div 2, Groups ABCD;
Class II, Div 2, Groups FG; Class III, Div 2.
Entity Parameters: Ui: 30 V; Ii: 175 mA; Ci: 0; Li: 0; Pi: 1.0 W
ATEX II 1G
Ex ia IIC T4
IP65
Ta = -40°C to 65°C
CE EMC Emissions and Immunity:
EN 61326:2013 EMC requirements for Electrical equipment for
measurement and laboratory use – Industrial
IEC 61010-1:2010 & EN 61010-1:2010, including Group and
National Differences as they apply for AU, CA, US and KR
Special Conditions for Safe Use:
The permitted ambient temperature range for the PD688 is -40°C to 65°C.
Year of Construction
This information is contained within the serial number with the first four
digits representing the year and month in the YYMM format.
For FM/CSA applications: The PD688 installation must be performed
in accordance with Control Drawing LIM688-2
For European Community: The PD688 must be installed in accord-
ance with the ATEX directive 94/9/EC, the product certificate
FM08ATEX0058X, and LIM688-2
SAFETY INFORMATION
Installation and service should be per-
formed only by trained
service personnel. Service requiring
replacement of internal components
must be performed at the factory.
CAUTION: Read complete
instructions prior to installation
and operation of the meter.
!

PD683 & PD688 Loop-Powered Meters Instruction Manual
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INSTALLATION
There is no need to remove the meter from its case to com-
plete the installation, wiring, and setup of the meter.
Unpacking
Remove the meter from box. Inspect the packaging and con-
tents for damage. Report damages, if any, to the carrier.
If any part is missing or the meter malfunctions, please contact
your supplier or the factory for assistance.
Panel Mounting
•Prepare a standard 1/8 DIN panel cutout – 3.622" x 1.772" (92 mm
x 45 mm). Refer to Mounting Dimensions, page 32 for more details.
•Clearance: allow at least 4" (102 mm) behind the panel for wiring.
•Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Minimum steel/stainless steel panel thickness to maintain watertight
rating: 0.06" (1.5 mm).
Note: A steel or stainless steel panel rather than plastic is
recommended in cases where a watertight or dust-tight seal is
required between the meter and the panel.
•Remove the two mounting brackets provided with the meter (back-off
the two screws so that there is ¼" (6.4 mm) or less through the
bracket. Slide the bracket toward the front of the case and remove).
•Insert meter into the panel cutout.
•Install mounting brackets and tighten the screws against the panel.
To achieve a proper seal, tighten the mounting bracket screws
evenly until meter is snug to the panel along its short side. DO NOT
OVER TIGHTEN, as the rear of the panel may be damaged.
Figure 1. Panel Cutout and Mounting
Panel
Gasket
Mounting
Bracket
Mounting
Screw
Removable
Connector
3.622" (92mm)
1.772"
(45mm) Panel Cutout
to DIN 43700
Square Corners to 0.060"
(1.5mm) Max Radius
A
B
Tolerances:
A: +0.032 (+0.8mm)
-0.000 (-0.0mm)
B: +0.024 (+0.6mm)
-0.000 (-0.0mm)
See page 32 for Mount-
ing Dimensions

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Wiring Connections
Signal connections are made to a four-terminal removable connector. This
section is only intended for the PD683.
PD688 installation must be performed in accordance with Control
Drawing LIM688-2 in order to meet agency approval ratings.
Observe all safety regulations. Electrical wiring
should be performed in accordance with all agency
requirements and applicable national, state, and lo-
cal codes to prevent damage to the meter and en-
sure personnel safety.
Figure 2. PD683 & PD688 Rear View
S+ S- B+ B-

PD683 & PD688 Loop-Powered Meters Instruction Manual
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4-20 mA Input Connections
Input connections are made to a four-terminal connector labeled
S+|S-|B+|B-. The loop-powered backlight is an optional configuration and
requires a total maximum voltage drop of 5.7 V. The backlight is recom-
mended for dim lighting conditions and is enabled when wired as shown
in Figure 3. It may be bypassed if installed in bright lighting conditions to
reduce the maximum voltage drop to 2.0 V as shown in Figure 4.
Figure 3. PD683 Input Connections with Backlight
Figure 4. PD683 Input Connections without Backlight
S
+
S
- B+ B-
4-20 mA
Transmitter
Power
Supply
S
+
S
- B+ B-
4-20 mA
Transmitter
Power
Supply

PD683 & PD688 Loop-Powered Meters Instruction Manual
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SETUP AND PROGRAMMING
•There is no need to recalibrate the meter for
milliamps when first received from the factory.
•The meter is factory calibrated for milliamps
prior to shipment. The calibration equipment
is certified to NIST standards.
Overview
There are no jumpers involved in the setup process of the meter.
Setup and programming is done through the front panel buttons.
After all connections have been completed and verified, apply power to
the loop.
For
Quick User Interface Reference Guide
go to page 36

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Front Panel Buttons & Status Indicators
Button
Symbol
Description Symbol Status
Menu 0%
Bargraph
minimum
Right arrow/Reset 100%
Bargraph
maximum
Up arrow/Max
Increasing trend
Enter/Ack
Decreasing trend
• Press the Menu button to enter or exit the Programming Mode at
any time.
• Press the Right arrow button to move to the next digit or decimal
position during programming.
• Press the Up arrow button to scroll through the menus, decimal
point, or to increment the value of a digit.
• Press the Enter/Ack button to access a menu or to accept a setting.
• Press and hold the Menu button for five seconds to access the Ad-
vanced Features
of the meter.

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Main Menu Display Functions & Messages
The meter displays various functions and messages during setup, pro-
gramming, and operation. The following table shows the main menu
functions and messages in the order they appear in the menu.
Display Parameter Action/Setting
setuP Setup Enter Setup menu
DeC..pt Decimal point Set decimal point
units Units Enter the Units menu
prog Program Enter the Program 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 Calibrate input 2 signal or program input 2
value
DsPl2 Display 2 Program display 2 value
Error Error Error, calibration not successful, check signal
graph Graph Enter the Graph menu
Pass Password Enter the Password menu
unloc Unlocked Program password to lock meter
Locd Locked Enter password to unlock meter
99999
-99999 Flashing dis-
play
Overrange condition
Underrange condition

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Main Menu
The main menu consists of the most commonly used functions: Setup,
Program, and Password.
•Press Menu button to enter Programming Mode then press Up ar-
row button to scroll main menu.
•Press Menu, at any time, to exit and return to Run Mode. Changes
made to settings prior to pressing Enter/Ack are not saved.
•Changes to the settings are saved to memory only after pressing
Enter/Ack.
•The display moves to the next menu every time a setting is
accepted by pressing Enter/Ack.
Setting Numeric Values
The numeric values are set using the Right and Up arrow buttons.
Press Right arrow to select next digit and Up arrow to increment digit.
The digit being changed blinks.
Press the Enter/Ack button, at any time, to accept a setting or Menu
button to exit without saving changes.
The decimal point is set using the Right or Up arrow button in the
Setup-decimal point menu.
9.2846GPS setup prog pass
Run
Mode
04.000 04.000 05.000
Increment Digit
Value
Next
Setting
Select Next Digit Accept Setting

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Setting Up the Meter (setup)
The Setup menu is used to select:
1. Decimal point position
2. Engineering units display
Press the Enter/Ack button to access any menu or press Up arrow but-
ton to scroll through choices. Press the Menu button to exit at any time.
Setting the Decimal Point (deC.pt)
Decimal point may be set with up to four decimal places or with no deci-
mal point at all.
Pressing the Right or Up arrow moves the decimal point one place to
the right until no decimal point is displayed, then it moves to the left
most position.
setuP deC.Pt units
deC.pt ddddd Next
Select Decimal
Point
Previous
or

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Setting the Units Display (units)
The meter can be set to display a combination of three alphanumeric
characters for engineering units or for identification (e.g. PSI, G/S, LpM,
TK3, ,L7). There is also a fourth alphanumeric character located above
this row, which supports a degrees symbol and “x10” symbol (e.g. °C,
°F, x103, x106, x109).
Press Right arrow to select next unit and Up arrow to increment unit.
The unit being changed blinks.
Press the Enter/Ack button, at any time, to accept a setting or Menu
button to exit without saving changes.
D
aBC
Increment
Character
Next
Setting
Select Next
Character
Accept Setting
D
aBC
D
aCC

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Programming the Meter (prog)
It is very important to read the following information, before proceeding
to program the meter:
•There is no need to recalibrate the meter for milliamps when first
received from the factory.
•The meter is factory calibrated for milliamps prior to shipment.
The calibration equipment is certified to NIST standards.
•Use the Scale menu to enter scale parameters without applying a
live signal.
•Alternatively, use the Calibrate menu to apply a signal from a cali-
brator or a 4-20 mA transmitter to calibrate the meter.
The Program menu contains the Calibrate and the Scale menus.
Inputs may be calibrated or scaled to any display within the range of the
meter.
Additional parameters, not needed for most applications, are pro-
grammed with the Advanced Features menu, see Advanced Features
Menu, page 24.
Error Message (Error)
An error message indicates that the calibration or scaling process was
not successful.
After the error message is displayed, the meter reverts to input 1, allow-
ing the appropriate input signals to be applied.
The error message might be caused by one of the following conditions:
1. Minimum input span requirements not maintained.
2. Input 1 signal inadvertently applied to calibrate input 2.
Minimum Input Span
The minimum input span is the minimum difference between input 1 and
input 2 signals required to complete the calibration or scaling of the me-
ter. The minimum span is 0.40 mA.
prog SCAle CAL GrapH

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Scaling the Meter (sCalE)
The 4-20 mA input can be scaled to display the process in engineering
units.
A signal source is not needed to scale the meter; simply program the in-
puts and corresponding display values.
For instructions on how to program
numeric values see Setting Numeric
Values, page 15.
dsPL1
Press Enter to Accept Setting
inpt2
Scale
Input 2
inpt1
Set Input 1
Value
sCalE
04.000
Set Display 1
Value
Press Up to Set Digit Value
Press Right to Select Next Digit
Press Menu to Exit at any Time
0.0000

PD683 & PD688 Loop-Powered Meters Instruction Manual
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Calibrating the Meter (Cal)
To scale the meter without a signal
source, refer to Scaling the Meter
(sCalE), page 19.
The meter can be calibrated to display the process in engineering units
by applying the appropriate input signal and following the calibration
procedure.
The use of a calibrated signal source is strongly recommended.
1. Press the Up arrow button to scroll to the Calibration menu (CAL)
and press Enter/Ack.
2. The meter displays inpt1. Apply a known signal and press En-
ter/Ack. Trend arrows are displayed while accepting the signal.
3. After the signal is accepted, the meter displays dspl1. Press En-
ter/Ack, enter a corresponding display value for the signal input,
and press Enter/Ack to accept.
4. The meter displays inpt1. Apply a known signal and press En-
ter/Ack. Trend arrows are displayed while accepting the signal.
5. After the signal is accepted, the meter displays dspl2. Press En-
ter/Ack, enter a corresponding display value for the signal input,
and press Enter/Ack to accept.
Recalibrating the Internal Calibration Reference (ICal)
The Internal Calibration (ICAL) menu, located in the Advanced features
menu, is used to recalibrate the internal calibration reference. Recalibra-
tion is recommended at least every twelve months. Refer to Internal
Calibration (ICal), page 28 for instructions.
inpt1 dspl1 04.000
Set Display 1
Value
inpt2
Calibrate
Input 2
Cal
Display
Flashes
Accepting
Input
Press Enter to Accept Setting
Press Up to Set Digit Value
Press Right to Select Next Digit
Press Menu to Exit at any Time