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PD683 & PD688
LOOP-POWERED METERS
Instruction Manual
PD688 only
• 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
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
Loop-
Powered
Backlight
Standard!
www.predig.com
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Disclaimer
The information contained in this document is subject to change
without notice. Precision Digital 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.
Registered Trademarks
NORYL® and LEXAN® are registered trademarks of SABIC Innovative Plastics. All other trademarks mentioned in this document are
the property of their respective owners.
© 2016 Precision Digital Corporation. All rights reserved.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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 buttons make the setup and programming an easy task. Five digits, bargraph, engineering units, and trend arrows provide a clear and attractive
presentation of the process.
The square root and programmable exponent functions allow for conditioning of signals from non-linear transmitters without adding external
components to the system and the convenience of scaling without a calibrated signal source make the PD683 & PD688 the ideal choice for process 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
PDA2410 3 Plastic NEMA 4X Enclosure
PDA2411 2 Plastic NEMA 4X Enclosure
PDA23XX 1-10 Economical Plastic NEMA 4X Enclosure Through Door
PDA25XX 1-10 Plastic NEMA 4X Enclosure
PDA26XX 1-6 Stainless Steel NEMA 4X Enclosure
PDA27XX 1-6 Steel NEMA 4 Enclosure
PDA2801* 1 Low-Cost Plastic NEMA 4X Enclosure
PDA2812 2 Low-Cost Plastic NEMA 4X Enclosure
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
Inside Cover
Inside Cover
Inside Cover
Through Door
Through Door
Through Door
Through Cover
Through Cover
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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
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PD683 & PD688 Loop-Powered Meters Instruction Manual
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY Five digits
DISPLAY
UPDATE RATE
OVERRANGE
UNDERRANGE
PROGRAMMING
METHOD
NOISE FILTER Programmable from 1 to 199
RECALIBRATION Recalibration is recommended at least every 12 months.
MAX/MIN
DISPLAY
PASSWORD Programmable password restricts modification of
NON-VOLATILE
MEMORY
NORMAL MODE
REJECTION
ENVIRONMENTAL Operating temperature range: -30 to 65°C (-40°C allowed)*
CONNECTIONS Removable screw terminals accept 12 to 22 AWG wire
ENCLOSURE &
MATERIALS
(-99999 to 99999)
Four characters
(Engineering Units)
Bargraph 20-segment, 0% to 100% indication.
Trend arrows Up and down trend indication.
Backlight Orange (intensity varies with signal)
1 update/second
Display flashes
Display flashes
Four front panel buttons
Max/min readings reached by the process are stored until
reset by the user or until power to the meter is turned off.
programmed settings.
All programmed settings are stored in non-volatile memory
for a minimum of ten years if power is lost.
64 dB at 50/60 Hz
Storage temperature range: -40 to 65°C
Relative humidity: 0 to 90% non-condensing
*Below -30°C, the LCD becomes less readable.
1/8 DIN, high impact plastic, UL 94V-0, color: gray
NORYL® Polyphenylene Ether & Polystyrene blend (PPE
PS) Resin
LEXAN® Polycarbonate (PC) Film
0.60" (15.2 mm) high, 7-segment, automatic lead zero blanking.
0.25" (6.4 mm) high, 14 segment.
99999
-99999
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PD683 & PD688 Loop-Powered Meters Instruction Manual
MOUNTING 1/8 DIN panel cutout required. Two panel mounting
TIGHTENING
TORQUE
OVERALL
DIMENSIONS
WEIGHT 5.7 oz (162 g)
WARRANTY 3 years parts and labor
EXTENDED
WARRANTY
bracket assemblies provided
Screw terminal connectors: 4.5 lb-in (0.5 Nm)
Mounting screws: 8.0 lb-in max. (0.9 Nm)
4.68" x 2.45" x 3.79" (119 mm x 62 mm x 96 mm)
(W x H x D)
1 or 2 years, refer to Price List for details
Input
ACCURACY
FUNCTION
LOW-FLOW
CUTOFF
TEMPERATURE
DRIFT
DECIMAL POINT
CALIBRATION
RANGE
VOLTAGE DROP Without Backlight With Backlight
EQUIVALENT RESISTANCE
INPUT
OVERLOAD
±0.03% of span ±1 count,
square root and programmable exponent: 10-100% FS
Linear, square root, or programmable exponent
-99999 to 99999 (-99999 disables cutoff function)
50 PPM/°C from -40 to 65°C ambient
Up to four decimal places:
d.dddd, dd.ddd, ddd.dd, dddd.d,or ddddd
An Error message will appear if input 1 and input 2 signals
are too close together.
Input
Range
4-20 mA 0.40 mA
2.0 V maximum 5.7 V maximum
100 Ω @ 20 mA 285 Ω @ 20 mA
Over current protection to 2 A max.
Minimum Span
Input 1 & Input 2
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PD683 & PD688 Loop-Powered Meters Instruction Manual
PD688 COMPLIANCE INFORMATION
Ratings and Approvals
FM & CSA Certified as intrinsically safe with entity for use in:
ATEX
CE EMC Emissions and Immunity:
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 accordance with the ATEX directive 94/9/EC, the product certificate
FM08ATEX0058X, and LIM688-2
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
II 1G
Ex ia IIC T4
IP65
Ta = -40°C to 65°C
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
SAFETY INFORMATION
!
CAUTION: Read complete
instructions prior to installation
and operation of the meter.
Installation and service should be performed only by trained
service personnel. Service requiring
replacement of internal components
must be performed at the factory.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
INSTALLATION
There is no need to remove the meter from its case to complete the installation, wiring, and setup of the meter.
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 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.
1.772"
B
(45mm)
A
3.622" (92mm)
Square Corners to 0.060"
(1.5mm) Max Radius
Panel Cutout
to DIN 43700
Tolerances:
A: +0.032 (+0.8mm)
-0.000 (-0.0mm)
B: +0.024 (+0.6mm)
-0.000 (-0.0mm)
Gasket
Mounting
Bracket
Figure 1. Panel Cutout and Mounting
Panel
Removable
Connector
Mounting
Screw
See page 32 for Mounting Dimensions
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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 local codes to prevent damage to the meter and ensure personnel safety.
S+ S- B+ B-
Figure 2. PD683 & PD688 Rear View
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PD683 & PD688 Loop-Powered Meters Instruction Manual
S+ S
S+ S
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 recommended 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.
- B+ B-
4-20 mA
Power
Supply
Figure 3. PD683 Input Connections with Backlight
Transmitter
- B+ B-
4-20 mA
Power
Supply
Figure 4. PD683 Input Connections without Backlight
Transmitter
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Front Panel Buttons & Status Indicators
Button
Symbol
•
Press the
any time.
•
Press the
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
•
Press and hold the
vanced Features
Description Symbol Status
Menu
Right arrow/Reset
Up arrow/Max
Enter/Ack
Menu
button to enter or exit the Programming Mode at
Right
arrow button to move to the next digit or decimal
Enter/Ack
of the meter.
0%
100%
button to access a menu or to accept a setting.
Menu
button for five seconds to access the
Bargraph
minimum
Bargraph
maximum
Increasing trend
Decreasing trend
Ad-
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Main Menu Display Functions & Messages
The meter displays various functions and messages during setup, programming, 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
prog
Pass
99999
-99999
DeC..pt
units
sCalE
Cal
inpt1
DspL1
inpt2
DsPl2
Error
graph
unloc
Locd
Setup
Decimal point
Units
Program
Scale
Calibrate
Input 1
Display 1
Input 2
Display 2
Error
Graph
Password
Unlocked
Locked
Flashing display
Enter Setup menu
Set decimal point
Enter the Units menu
Enter the Program menu
Enter the Scale menu
Enter the Calibrate menu
Calibrate input 1 signal or program input 1
value
Program display 1 value
Calibrate input 2 signal or program input 2
value
Program display 2 value
Error, calibration not successful, check signal
Enter the Graph menu
Enter the Password menu
Program password to lock meter
Enter password to unlock meter
Overrange condition
Underrange condition
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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.
Run
Mode
9.2846GPS setup prog pass
• 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.
Increment Digit
Value
04.000
Select Next Digit Accept Setting
The decimal point is set using the Right or Up arrow button in the
Setup-decimal point menu.
04.000 05.000
15
Setting
Next
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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 button to scroll through choices. Press the Menu button to exit at any time.
setuP deC.Pt
Setting the Decimal Point (deC.pt)
Decimal point may be set with up to four decimal places or with no decimal 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.
units
Select Decimal
Point
or
Previous
deC.pt
ddddd
16
Next
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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
Select Next
Character
D
aBC
Increment
Character
17
D
aCC
Accept Setting
Next
Setting
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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.
prog SCAle
Additional parameters, not needed for most applications, are programmed 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, allowing 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 meter. The minimum span is 0.40 mA.
CAL GrapH
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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 inputs and corresponding display values.
Press Enter to Accept Setting
sCalE
Press Up to Set Digit Value
Press Right to Select Next Digit
inpt1
Press Menu to Exit at any Time
04.000
Set Input 1
Value
dsPL1
For instructions on how to program
numeric values see Setting Numeric
Values, page 15.
0.0000
Set Display 1
Value
19
inpt2
Scale
Input 2
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PD683 & PD688 Loop-Powered Meters Instruction Manual
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.
Press Enter to Accept Setting
Press Up to Set Digit Value
Cal
Press Right to Select Next Digit
Press Menu to Exit at any Time
inpt1 dspl1 04.000
Display
Flashes
Accepting
Input
Set Display 1
Value
inpt2
Calibrate
Input 2
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. Recalibration is recommended at least every twelve months. Refer to Internal
Calibration (ICal), page 28 for instructions.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Setting Up the Bargraph (GrapH)
The meter can be set to display a bargraph proportional to the percentage process reading within a user-defined span.
The span is determined by values entered for 0% and 100%.
If the 0% and 100% values are the same as the values that were entered for display 1 and display 2, respectively, from the scale or calibrate steps, then it is not necessary to modify them.
The bargraph may be disabled by selecting OFF from the bargraph
menu.
GrapH
-OFF-
Set 0%
Value
Set 100%
Value
-ON-
0PCT
00.000
100PCT
50.000
Run Mode
Press Up to Set Digit Value
Press Right to Select Next Digit
Press Menu to Exit at any Time
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Setting Up the Password (pass)
The Password menu is used to program a five-digit password to prevent
unauthorized changes to the programmed parameter settings.
Locking the Meter
Enter the Password menu and program a five-digit password.
For instructions on how to program numeric values see Setting Numeric
Values, page 15.
Run Mode
pass unloc 00000
Program
Password
Record the password for future reference. If appropriate, it may be
recorded in the space provided.
Model:
Serial Number:
Password: __ __ __ __ __
22
locd
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Unlocking the Meter
If the meter is password protected, the correct password must be
entered in order to make changes to the parameter settings.
Run Mode
pass locd 00000
Enter
Password
Entering the correct five-digit number sets the password to 00000, disabling the protection. The meter remains unlocked until a new password
is programmed or the former password is re-programmed using the
Password menu.
Changes to the programmed parameter settings are allowed only with
the password set to 00000.
If the password entered is incorrect, the meter displays Locd (Locked)
for about three seconds, then it returns to Run Mode. To try again,
press Enter/Ack while the Locked message is displayed.
unloc
Forgot the Password?
The password may be disabled by the following
procedure:
1. Note display reading prior to pressing the Menu
button. Ignore decimal point and sign.
2. Access the
reading and enter that number as the password
(e.g. display reading = -1.23, password = 00125).
Password menu, add 2 to the noted
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Advanced Features Menu
To simplify the setup process, functions not needed for most applications are located in the Advanced Features menu.
Press and hold the Menu button for five seconds to access the Ad-
vanced Features of the meter.
Run Mode
9.2846GPS
Press and hold for five seconds
out
funct
contr
flter
Press Enter/Ack to Access
Menu or to Accept Setting
Press Up to Scroll Menu and
to Increment Digit Value
Press Right to Select Next Digit
Press Menu to Exit at any Time
bypas
trend
I CAL info
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Advanced Features Menu & Display Messages
The following table shows the Advanced features menu functions and
messages in the order they appear in the menu.
Display Parameter Action/Setting
Funct
contr
flter
bypas
Trend
ICal
Info
Lnear
Squar
Prog.E
cutof
-ON-
-Off-
reset
Function
Linear
Square Root
Programmable
Exponent
Low-Flow Cutoff
Contrast
Filter
Bypass
Trend Arrows
On
Off
Initial calibration
Meter
information
Reset Defaults
Enter Function menu
Set linear scaling
Set square root extraction
Set programmable exponent
Set low-flow cutoff
Enter contrast adjustment menu
Set noise filter value
Set filter bypass value
Enable or disable trend arrows
Enable trend arrow display
Disable trend arrow display
Enter initial calibration for process inputs
Show software number and version, or reset
to defaults
Restore factory default parameter settings
For instructions on how to program
numeric values see Setting Numeric
Values, page 15.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Math Functions (lnear, Squar, Prog.E, Cutof)
The PD683 & PD688 provide a number of math functions to condition
outputs from linear and non-linear transmitters.
Advanced
Features
Press Enter to Accept Setting
LnearFunct Squar
prog.e Cutof
Linear (lnear)
Meters are set up at the factory for linear function. The linear function
provides a display that is linear with respect to the input signal.
Square Root (Squar)
The square root function is used to linearize the signal from a differential
pressure transmitter and display flow rate in engineering units.
Programmable Exponent (Prog.E)
The programmable exponent function is used to linearize the level signal in applications using weirs and flumes and display flow rate in engineering units. Upon selecting programmable exponent (Prog.E), the meter prompts entry of a 5-digit value between 0.5000 and 3.0000 as the
exponent.
Low-Flow Cutoff (CutoF)
The low-flow cutoff feature allows the meter to be programmed so that
the often-unsteady output from a differential pressure transmitter, at low
flow rates, always displays zero on the meter. The cutoff value may be
programmed from -99999 to 99999. Below the cutoff value, the meter
will display zero. Selecting either square root or programmable exponent will set the cutoff value to 0. Program the cutoff value to -99999 to
disable.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Contrast (contr)
LCD contrast is adjustable through the front panel buttons. Select contr
and increase level using Up Arrow/Max button. Settings 1 through 9 will
be displayed on the screen as 11111 to 99999. Settings 1 through 4 are
usually best when viewing from below the angle perpendicular to the
display. Settings 5 through 9 are usually best when viewing straight on
(meter is at eye level) or when viewing from above.
Noise Filter (fltEr)
Most applications do not require changing this parameter. It is intended
to help attain a steady display with an unsteady (noisy) input signal.
The field selectable noise filter averages any minor or quick changes in
the input signal and displays the reading with greater stability.
Increasing the filter value will help stabilize the display, however this will
reduce the display response to changes on the input signal.
The filter level may be set anywhere from 1 to 199.
Noise Filter Bypass (bypAs)
The meter can be programmed to filter small input changes, but allow
larger input changes to be displayed immediately, by setting the bypass
value accordingly.
If the input signal goes beyond the bypass value, it will be displayed immediately with no averaging done on it.
The noise filter bypass value may be set anywhere from 0.2 to 99.9. It
corresponds to percentage of full scale.
Increasing the bypass value may slow down the display response to
changes on the input signal.
Pressing the Right Arrow/Reset button will also bypass the filter and
provide an instant update.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Internal Calibration (ICal)
• 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.
The internal calibration allows the user to scale the meter without applying a signal. The use of a calibrated signal source is necessary to perform the internal calibration of the meter. Check calibration of the meter
at least every 12 months.
Notes:
• The signal source must have a full-scale accuracy
of 0.01% or better between 4 and 20 mA in order
to maintain the specified accuracy of the PD688.
• Allow the meter to warm up for at least
15 minutes before performing the internal calibration procedure.
The Internal calibration menu is part of the Advanced features menu.
1. Press and hold the Menu button for five seconds to access the Advanced Features of the meter.
2. Press the Up arrow button to scroll to the Internal calibration menu
(ICAL) and press Enter/Ack.
3. The meter displays 4.000 mA. Apply a 4.000 mA signal and press
Enter/Ack. The display shows both trend arrows for a moment
while the meter is accepting the signal.
4. After the signal is accepted, the meter displays 8.000 mA. Apply an
8.000 mA signal and press Enter/Ack. The display shows both
trend arrows for a moment while the meter is accepting the signal.
5. Continue, as in the previous step, for the remaining signals:
12.000 mA, 16.000 mA, and 20.000 mA.
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 the previous signal prompt, allowing the appropriate input signal to be
applied. The error message might be caused by inadvertently leaving
the signal at the previous level.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Information Menu (info)
The Information menu is located in the Advanced features menu, to access Information menu see Advanced Features Menu, page 24.
It shows software and version number. To determine the software version of a meter:
1. Go to the Information menu (info) and press Enter/Ack but-
ton. The number shown is the software number.
2. Press Enter/Ack again to display the release version.
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PD683 & PD688 Loop-Powered Meters Instruction Manual
OPERATION
Front Panel Buttons Operation
Button
Description
Symbol
Press to enter or exit Programming Mode,
view settings, or exit Max/Min readings
Press to reset Max/Min readings
Press to manually bypass filtering
Press to display Max/Min readings
alternately
Press to display Max/Min reading
indefinitely while displaying Max/Min
Press ACK to acknowledge trend arrows
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Maximum & Minimum Readings (Max& MiN)
The maximum and minimum (peak & valley) readings reached by the process are stored in the meter since the last reset or power-up. The meter
shows MIN or MAX to differentiate between run mode and max/min display.
Run Mode
9.2846GPS
10 Sec Time Out
Press Up to Display and to
Toggle Between Max & Min
Press Enter to hold Max/Min
Press Right to Reset Max/Min
Press Menu to Exit Max/Min
1. Press Up arrow/Max button to display maximum reading since the
last reset/power-up.
2. Press Up arrow/Max again to display the minimum reading since
the last reset/power-up.
3. Press Enter/Ack to hold Max/Min display reading, the meter will
continue to track new Max/Min readings.
4. If Enter/Ack is not pressed, the Max/Min display reading will time
out after ten seconds and the meter will return to display the actual
reading.
5. Press Right arrow/Reset button to reset Max/Min while reading is
being displayed. Max/Min display readings are reset to actual
reading.
9.5320MAX
6.1391MIN
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PD683 & PD688 Loop-Powered Meters Instruction Manual
MOUNTING DIMENSIONS
1.76"
(45mm)
2.45"
(62mm)
0.59"
(15mm)
3.2"
(81mm)
Figure 5. Meter Dimensions – Side View
3.61"
(92mm)
4.68"
(119mm)
Figure 6. Case Dimensions – Top View
32
2.50"
(64mm)
Page 33
PD683 & PD688 Loop-Powered Meters Instruction Manual
Reset Meter to Factory Defaults
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 defaults.
Instructions to load factory defaults:
1. Enter the Advanced features menu. See Advanced Features Menu,
page 24.
2. Press Up arrow until info is shown.
3. Press and hold Right arrow/Reset for five seconds, press
Enter/Ack when display flashes reset.
Note: If Enter/Ack is not pressed within three seconds, display returns to Information menu.
4. The meter goes through an initialization sequence (same as on
power-up), and loads the factory default settings.
Press and Hold for 5 Sec
Flashing
Display
info
reset
Meter Re-
Initializes
Press and Hold
for 3 Sec
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Factory Defaults & User Settings
The following table shows the factory setting for most of the programmable parameters on the meter. Next to the factory setting, the user
may record the new setting for the particular application.
Model: ______________ S/N: _______________ Date: _________
Parameter Display Default Setting User Setting
Programming
Input 1
Display 1
Input 2
Display 2
Decimal point
Bargraph
Bargraph 0%
Bargraph 100%
Password
Advanced
Features
Function
Contrast
Cutoff
Filter
Bypass
Trend Arrows
prog
inPt1
Dspl1
inPt2
Dspl2
Dd.ddd
GrapH
0 PCT
100 PCT
pass
Funct
contr
Cutof
Flter
Bypas
Trend
Scale
4.000 mA
4.000
20.00 mA
20.000
3 places
On (enabled)
4.000
20.000
00000 (unlocked)
Linear
5 (55555)
-99999 (disabled)
1
0.2
On (enabled)
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PD683 & PD688 Loop-Powered Meters Instruction Manual
TROUBLESHOOTING
The rugged design and the user-friendly interface of the meter should
make it unusual for the installer or operator to refer to this section of the
manual.
If the meter is not working as expected, refer to the recommendations
below.
Troubleshooting Tips
Symptom Check/Action
No display or faint display
Rate display unsteady
Not able to change setup or programming,
Meter displays error message during calibration (
Meter displays
• 99999
• -99999
Display stuck showing a number
and
Display response is too slow
If the display locks up or the meter
does not respond at all
Display shows blurry, hard-to-read
digits in below freezing temperatures (less than -18°C or 0°F).
Other symptoms not described
above
Locd is displayed
error)
MAX or MIN
1. Check connections.
2. Increase contrast setting in
Advanced menu.
3. Perform hard reset by temporarily
shorting S+ and S- terminals for a
few seconds.
Increase filter setting in
menu.
Meter is locked, enter correct five-digit
password to unlock.
Check:
1. Signal connections
2. Minimum input span requirements
Check:
1. Input signal within range.
2. When using square root or programmable exponent, cutoff must
be zero or greater.
Press
Menu to exit Max/Min
display readings.
Check filter and bypass values to see if
they can be lowered.
Perform hard reset by temporarily shorting S+ and S- terminals for a few seconds and then removing short.
Increase the filter setting to 10 or
greater and the bypass setting to 50 or
greater. This will slow the display response rate, but digits will be steady
and appear more clearly.
Call Technical Support for
assistance.
Advanced
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PD683 & PD688 Loop-Powered Meters Instruction Manual
QUICK USER INTERFACE REFERENCE GUIDE
Run Mode
Setup
Display
Max/Min
Decimal
ddddd
d . dddd
dd . ddd
Program
Password
Locked Unlocked
Scale
Calibrate
Bargraph
Units
On
Off
To Password
ddd . dd
dddd . d
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PD683 & PD688 Loop-Powered Meters Instruction Manual
Pushbutton Function
Menu Go to Programming Mode or leave Programming, Advanced
Right Arrow Move to next digit or decimal point position. Reset Total.
Up Arrow Move to next selection or increment digit. Go to Max/Min Mode.
Enter/Ack Accept selection/value and move to next selection. Toggle Rate/
Total.
Menu held for 5 seconds enters Advanced Features
Max/Min Mode
While in Run Mode, pressing Up Arrow will initiate Max/Min Mode. Up Arrow toggles
between Max & Min displays, and Right Arrow resets the Max/Min to the current
value. Press Menu or wait 10 seconds to return to Run Mode. Pressing Enter/Ack will
disable the 10 second timeout and continuously display Max or Min.
Press & hold Menu for 5
seconds to access Advanced
Features Menu
Function
Features, and Max/Min Modes.
Hold to Acknowledge Alarm.
When a password is enabled,
parameter settings are locked, but
scale settings can be displayed by
selecting the program menu.
Linear
Square Root
Programmable
Exponent
Cutoff
Contrast
On
Off
*Factory
Defaults
Advanced
Features
Software
Filter
Bypass
Trend
Arro ws
Initial
Calibrate
Information
*Access by holding Right/Reset for 3 seconds
Menu for 5
seconds
Menu
Version
Operational Modes
Run
Menu
Menu
Program
37
Up Arrow
Menu
Max &
Min
Page 38
EU DECLARATION OF CONFORMITY FOR PD688
We,
as the manufacturer, declare under our sole responsibility that the product(s),
to which this declaration relates, is in conformity with the European Union Directives shown
below:
This conformity is based on compliance with the application of harmonized or applicable
technical standards and, when applicable or required, a European Union notified body
certification.
Standards:
EC Type Examination Certificate: FM08ATEX0058X
Product Markings: II 1 G
Ex ia IIC T4
Tamb = -40°C to +65°C
ATEX Notified Body for EC Type Examination Certificate:
FM Approvals Ltd., NB 1725
1 Windsor Dials
Windsor, Berkshire, SL4 1RS, UK
ATEX Quality Assurance Notification No.:
SIRA 10 ATEX M462
ATEX Notified Body for Quality Assurance:
Sira Certification Service, NB 0518
Rake Lane
Eccleston, Chester, CH4 9JN, UK
Signed for and on behalf of Precision Digital Corporation:
Issued in accordance with ISO/IEC 17050-1:2004 and ATEX Directive 2014/34/EU.
Precision Digital Corporation
233 South Street
Hopkinton, MA 01748 USA
Model PD688 Loop Powered Panel Meter
2014/35/EU Low Voltage Directive
2014/34/EU ATEX Directive
2014/30/EU EMC Directive
2011/65/EU RoHS Directive
EN 60079-0:2006 EN 60079-11:2007 EN 60079-26:2007
EN 61010-1:1995 EN 61326:2006
The standards EN 60079-0:2006, EN 60079-11:2007, EN 60079-26:2007, EN 610101:1995, and EN 61326:2006 are no longer harmonized. The requirements of these
standards have been checked against the harmonized standard EN 600790:2012+A11:2013, EN 60079-11:2012, EN 60079-26:2015, EN 61010-11:2010, and EN
61326:2013 and there were no major technical changes affecting the latest technical
knowledge for the products listed above.
Name: Jeffrey Peters
Company: Precision Digital Corporation
Title: President
Date: 04/20/2016
Document No: DoC PD688 {042016}
Page 39
EU DECLARATION OF CONFORMITY FOR PD683
Issued in accordance with ISO/IEC 17050-1:2004.
We,
as the manufacturer, declare under our sole responsibility that the product(s),
to which this declaration relates, is in conformity with the European Union Directives shown
below:
This conformity is based on compliance with the application of harmonized or applicable
technical standards and, when applicable or required, a European Union notified body
certification.
Standards:
Product Markings:
Precision Digital Corporation
233 South Street
Hopkinton, MA 01748 USA
Model PD683 Loop Powered Panel Meter
2014/35/EU Low Voltage Directive
2014/30/EU EMC Directive
2011/65/EU RoHS Directive
EN 60079-0:2006
EN 60079-11:2007
EN 60079-26:2007
EN 61010-1:1995
EN 61326:2006
The standards EN 60079-0:2006, EN 60079-11:2007, EN 60079-26:2007, EN 610101:1995, and EN 61326:2006 are no longer harmonized. The requirements of these
standards have been checked against the harmonized standard EN 600790:2012+A11:2013, EN 60079-11:2012, EN 60079-26:2015, EN 61010-11:2010, and EN
61326:2013 and there were no major technical changes affecting the latest technical
knowledge for the products listed above.
Signed for and on behalf of Precision Digital Corporation:
Name: Jeffrey Peters
Company: Precision Digital Corporation
Title: President
Date: 04/20/2016
Document No: DoC PD683 {042016}
Page 40
PD683 & PD688 Loop-Powered Meters Instruction Manual
How to Contact Precision Digital
• For Technical Support:
Call: (800) 610-5239 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
• For Sales Support:
Call: (800) 343-1001 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
• For the latest version of this manual please visit:
www.predig.com
SFT037 Ver 1.210 & up
LIM688_K
04/16
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