PRECISION DIGITAL PD6800 User manual

PRECISION DIGITAL CORPORATION
89 October Hill Road • Holliston MA 01746 USA
Tel [phone] • Fax [phone] www.predig.com
PD6800 EXPLOSION-PROOF
LOOP-POWERED PROCESS METER
4-20 mA Input Loop-Powered
Modern, Sleek and Practical Enclosure
5 Digits, 0.7" (17.8 mm) Upper Display
7 Alphanumeric Character, 0.4" (10.2 mm) Lower Display
SafeTouch®Through-Glass Button Programming
Password Protection
32-Point, Square Root, or Exponential Linearization
Loop-Powered or External DC-Powered Backlight Standard
HART®Protocol Transparent
3 V Drop (6.0 V with Backlight)
Explosion-Proof, IP68, NEMA 4X Enclosure
Operates from -40 to 75°C
®

PD6800 Loop-Powered Process Meter Instruction Manual
2
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.
!
CAUTION: Read complete
instructions prior to installation
and operation of the meter.
WARNING: Risk of
electric shock or
personal injury.
WARNINGS
• 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.
• Never remove the meter cover in explosive environments when the circuit is live.
• Cover must be fully engaged to meet flameproof/explosion-proof requirements.
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.
Registered Trademarks
All trademarks mentioned in this document are the property of their respective
owners.
© 2011-2015 Precision Digital Corporation. All rights reserved.
www.predig.com

PD6800 Loop-Powered Process Meter Instruction Manual
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INTRODUCTION
The PD6800 is a rugged, explosion-proof loop-powered meter fully featured for
demanding applications in hazardous areas or in the harshest environmental
conditions. The meter derives all of its power from the 4-20 mA loop. It is
programmed using the four SafeTouch®through-glass buttons, without removing the
cover, and can be scaled with or without a calibration signal. The numeric display will
read up to 99999 and the alphanumeric display can 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 two threaded conduit holes and integrated pipe or wall
mounting slotted flanges.
ORDERING INFORMATION
Model Description
PD6800-0K0 Explosion-Proof Loop-Powered Process Meter with Backlight
Accessories
Model Description
PDA0001 3/4" M-NPT to F-M20 Reducer
PDA0002 3/4" M-NPT to 1/2" F-NPT Reducer

PD6800 Loop-Powered Process Meter Instruction Manual
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Table of Contents
INTRODUCTION---------------------------------------------------------------------- 3
ORDERING INFORMATION------------------------------------------------------- 3
SPECIFICATIONS-------------------------------------------------------------------- 6
General -------------------------------------------------------------------------------------------6
Input -----------------------------------------------------------------------------------------------7
Product Ratings and Approvals ---------------------------------------------------------8
Electromagnetic Compatibility-----------------------------------------------------------9
SAFETY INFORMATION --------------------------------------------------------------------9
INSTALLATION----------------------------------------------------------------------10
Unpacking------------------------------------------------------------------------------------- 10
Pre-Installed Conduit/Stopping Plug------------------------------------------------- 10
Mounting--------------------------------------------------------------------------------------- 11
Cover Jam Screw --------------------------------------------------------------------------- 11
Connections ---------------------------------------------------------------------------------- 11
Connections & Wiring Diagrams................................................................ 13
SETUP AND PROGRAMMING --------------------------------------------------15
SafeTouch®Buttons ----------------------------------------------------------------------- 16
Buttons and Display ----------------------------------------------------------------------- 17
Main Menu Display Functions & Messages---------------------------------------- 18
Main Menu------------------------------------------------------------------------------------- 19
Setting Numeric Values------------------------------------------------------------------- 20
Setting Up the Meter (SETUP)------------------------------------------------------------ 20
Setting the Decimal Point (Dec.Pt)............................................................. 21
Programming the Meter (PRoG).................................................................. 22
Scaling the Meter (SCale)---------------------------------------------------------- 23
Calibrating the Meter (Cal) -------------------------------------------------------- 24
Re-Calibrating the Internal Calibration Reference (ICaL) ----------------- 25
Setting the Tag Display (tag) .................................................................... 25
Setting Up the Password (PASSWRD).......................................................... 26
Locking the Meter ...................................................................................... 26
Making Changes to a Password Protected Meter ..................................... 26
Disabling Password Protection .................................................................. 27
Service Feature (SERVICE) --------------------------------------------------------------- 27
Advanced Features Menu---------------------------------------------------------------- 28
Advanced Features Menu & Display Messages........................................ 29
Indication (INDICAT) .................................................................................. 30
Advanced Function Selection (FUNCTN)..................................................... 31
Multi-Point Linearization (lnear)------------------------------------------------- 31
Square Root Linearization (Squar) ---------------------------------------------- 32
Programmable Exponent Linearization (Prog.E) ----------------------------- 32

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Low-Flow Cutoff (CUTOFF) ......................................................................... 33
Input Signal Filter (FILTER) ....................................................................... 33
Internal Calibration (ICAL) ......................................................................... 34
Information (INFO) ..................................................................................... 34
OPERATION--------------------------------------------------------------------------35
Front Panel Buttons Operation -------------------------------------------------------- 35
Maximum & Minimum Readings (MAXIMUM & MINIMUM)------------------------ 36
Reset Meter to Factory Defaults------------------------------------------------------- 36
Factory Defaults & User Settings ----------------------------------------------------- 37
TROUBLESHOOTING -------------------------------------------------------------38
Troubleshooting Tips---------------------------------------------------------------------- 38
MOUNTING DIMENSIONS--------------------------------------------------------39
QUICK USER INTERFACE REFERENCE------------------------------------41
EC DECLARATION OF CONFORMITY---------------------------------------42
Table of Figures
Figure 1. Connector Board......................................................................12
Figure 2. Connections without Backlight...............................................13
Figure 3. Connections with Loop-Powered Backlight...........................14
Figure 4. Connections with Externally-Powered Backlight ..................14
Figure 5. Scale Menu................................................................................23
Figure 6. Multi-Point Linearization Menu ...............................................32
Figure 7. Enclosure Dimensions – Front View ......................................39
Figure 8. Enclosure Dimensions – Side Cross Section View...............40

PD6800 Loop-Powered Process Meter Instruction Manual
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SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY Five digits
(-9999 to 99999)
0.70" (17.8 mm) high, 7-segment,
automatic lead zero blanking.
Seven characters
(Engineering Units)
0.4" (10.2 mm) high, 14 segment.
Symbols High & Low Alarm, Password Lock
Backlight White
DISPLAY
UPDATE RATE Ambient > -25°C: 2 Updates/Second Ambient < -25°C: 1 Update/5 Seconds
OVERRANGE Display flashes 99999
UNDERRANGE Display flashes -9999
PROGRAMMING
METHOD Four SafeTouch®through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
NOISE FILTER Programmable LO,med,HI, or OFF
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 75°C
Relative humidity: 0 to 90% non-condensing
CONNECTIONS Screw terminals accept 12 to 22 AWG wire
ENCLOSURE
Explosion-proof die cast aluminum with glass window, corrosion resistant epoxy coating, color: blue. NEMA 4X, 7, &
9, IP68.
Two ¾" NPT threaded conduit openings. One ¾" NPT metal
conduit/stopping plug with 12 mm hex key fitting installed.
MOUNTING May be mounted directly to conduit. Two slotted flanges for
wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm pipe
mounting. See Mounting Dimensions on page 39.

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OVERALL
DIMENSIONS 5.65" x 5.25" x 4.86" (W x H x D) (144 mm x 133 mm x 124 mm)
WEIGHT 5.00 lbs (80 oz, 2.27 kg)
WARRANTY 3 years parts and labor
Input
ACCURACY ±0.03% of calibrated span ±1 count,
square root & programmable exponent accuracy range:
10-100% of calibrated span.
ADVANCED
FUNCTION Linear, square root, or programmable exponent
MULTI-POINT
LINEARIZATION 2 to 32 points
PROGRAMMABLE
EXPONENT 1.0001 to 2.9999
LOW FLOW CUTOFF 0-99999 (0 disables cutoff function)
TEMPERATURE
DRIFT 50 PPM/C from -40 to 75C ambient
DECIMAL POINT User selectable decimal point
MINIMUM SPAN Input 1 & Input 2: 0.10 mA
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 0.10 mA
MAXIMUM
VOLTAGE DROP Without Backlight or with Externally-Powered (DC
Powered) Backlight
With Loop-Powered
Backlight
3.0 VDC @ 20 mA 6.0 VDC @ 20 mA
EQUIVALENT
RESISTANCE 150 Ω@ 20 mA 300 Ω@ 20 mA
EXTERNALLY
POWERED
BACKLIGHT
Voltage Range: Maximum Power
9-36 VDC 9 VDC 12 VDC 24 VDC 36 VDC
0.2 W 0.25 W 0.5 W 0.75 W
INPUT
OVERLOAD Over current protection to 2 A max.

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Product Ratings and Approvals
FM Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1; T6
Class I, Zone 1, AEx d IIC T6 Gb
Zone 21, AEx tb IIIC T85°C
Ta = -40°C to +75°C
Enclosure: Type 4X & IP66
Certificate number: 3040391
ATEX II 2 G D
Ex d IIC T6 Gb
Ex tb IIIC T85°C Db IP68
Ta = -40°C to +75°C
Certificate number: Sira 10ATEX1116X
CSA Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1; T6
Class I, Zone 1, Ex d IIC T6
Ta = -40°C to +75°C
Enclosure: Type 4X & IP66
Certificate number: 11 2325749
IECEx Ex d IIC T6 Gb
Ex tb IIIC T85°C Db IP68
Ta = -40°C to +75°C
Certificate number: IECEx SIR 10.0056X
Special Conditions for Safe Use:
Use suitably certified and dimensioned cable entry device and/or plug. The
equipment shall be installed such that the supply cable is protected from mechanical
damage. The cable shall not be subjected to tension or torque. If the cable is to be
terminated within an explosive atmosphere, then appropriate protection of the free
end of the cable shall be provided.
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 European Community: The PD6800 must be installed in accordance with the
ATEX directive 94/9/EC, and the product certificate Sira 10ATEX1116X.

PD6800 Loop-Powered Process Meter Instruction Manual
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Electromagnetic Compatibility
EMISSIONS EN 61326:2006
Safety requirements for measurement, control, and
laboratory use – Industrial
Group 1 Class A ISM emissions requirements
Radiated
Emissions
Class A
IMMUNITY EN 61326:2006
Safety requirements for measurement, control, and
laboratory use
ESD ±4 kV contact,
±8 kV air
RFI – Amplitude
Modulated
80-1000 MHz @ 10 V/m,
1.4-2.0 GHz @ 3 V/m,
2.0-2.7 GHz @ 1 V/m,
80% AM (1 kHz)
EFT ±2 kV DC mains, ±1 kV other
Telco Surge ±1 kV
CRFI 3 V, 0.15-80 MHz, 1 kHz 80% AM
SAFETY INFORMATION
WARNINGS
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.
Disconnect from supply before opening enclosure. Keep cover tight while
circuits are alive. Conduit seals must be installed within 18" (450mm) of
the enclosure.
Verify that the operating atmosphere of the meter is consistent with the
appropriate hazardous locations certifications.
If the meter is installed in a high voltage environment and a fault or
installation error occurs, high voltage may be present on any lead
.

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INSTALLATION
For Installation in USA: The PD6800 must be installed in accordance with the
National Electrical Code (NEC) NFPA 70.
For Installation in Canada: The PD6800 must be installed in accordance with the
Canadian Electrical Code CSA 22.1. All input circuits must be derived from a CSA
approved Class 2 source.
For European Community: The PD6800 must be installed in accordance with the
ATEX directive 94/9/EC and the product certificate Sira 10ATEX1116X.
WARNING
Disconnect from supply before opening enclosure. Keep cover
tight while circuits are alive. Conduit seals must be installed within
18" (450mm) of the enclosure.
Wiring connectors are accessed by opening the enclosure. To access electrical
connectors, remove the 2 captive screws, then disconnect the ribbon cable from the
display module 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 malfunctions, please contact your supplier or the
factory for assistance.
Pre-Installed Conduit/Stopping Plug
The PD6800 is supplied with one pre-installed conduit plug for installations that do
not require the use of both conduit entries. The conduit/stopping plug includes an
internal hexagonal socket recess for removal. The pre-installed plug and installation
is included in all hazardous area approvals of the PD6800.
WARNING
In hazardous areas, conduit and conduit/stopping plugs require the
application of non-setting (solvent free) thread sealant. It is critical
that all relevant hazardous area guidelines be followed for the
installation or replacement of conduit or plugs.

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Mounting
The PD6800 has two slotted mounting flanges that may be used for pipe mounting or
wall mounting. Alternatively, the unit may be supported by the conduit using the
conduit holes provided.
Refer to Mounting Dimensions, page 39 for details.
WARNING
Do not attempt to loosen or remove flange bolts while the meter is
in service.
Cover Jam Screw
The cover jam screw should be properly installed once the meter has been wired and
tested in a safe environment. The cover jam screw is intended to prevent the removal
of the meter cover in a flameproof environment without the use of tools. Using a M2
hex wrench, turn the screw clockwise until the screw contacts the meter. Turn the
screw an additional 1/4 to 1/2 turn to secure the cover. Caution: Excess torque may
damage the threads and/or wrench.
Connections
WARNINGS
Static electricity can damage sensitive components.
Observe safe handling precautions for static-sensitive components.
Use proper grounding procedures/codes.
If the meter is installed in a high voltage environment and a fault or
installation error occurs, high voltage may be present on any lead or
terminal.
To access the connectors, remove the enclosure cover and unscrew the two captive
screws that fasten the display module. Disconnect the ribbon cable and remove the
display module. Signal connections are made to a four-terminal connector in the base
of the enclosure. Grounding connections are made to the two ground screws
provided on the base – one internal and one external.

PD6800 Loop-Powered Process Meter Instruction Manual
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Connections (continued)
SIGNAL + 4-20 mA signal input positive terminal connection
SIGNAL - 4-20 mA signal return/negative terminal connection when not
using loop powered backlight.
BACKLIGHT + +9-36 VDC when powering backlight from external supply.
BACKLIGHT - 4-20 mA signal return/negative terminal when using the installed
loop powered backlight or ground/negative when powering
backlight from external supply.
Refer to Figure 1 for terminal positions.
WARNING
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.
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP
9-36 VDC
+-+-
SIGNAL BACKLIGHT
Figure 1. Connector Board

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Connections & Wiring Diagrams
Signal connections are made to a four-terminal connector mounted in the base of the
enclosure. The enclosure also provides one internal and one external earth
grounding screw. For installations without backlight, only the two signal terminals are
connected. The 4-20 mA input with no backlight has a maximum voltage drop of 3 V
and is wired as shown in Figure 2. The loop-powered backlight configuration requires
a total maximum voltage drop of 6 V. The backlight is recommended for dim lighting
conditions and is enabled when wired as shown in Figure 3 or Figure 4.
4-20 mA
Transmitter
Power
Supply
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP
9-36 VDC
+-+-
SIGNAL BACKLIGHT
Figure 2. Connections without Backlight

PD6800 Loop-Powered Process Meter Instruction Manual
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4-20 mA
Transmitter
Power
Supply
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP
9-36 VDC
+-+-
SIGNAL BACKLIGHT
Slide Switch to
LOOP
Figure 3. Connections with Loop-Powered Backlight
4-20 mA
Transmitter
Power
Supply
SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK LOCK LOOP
9-36 VDC
+-+-
SIGNAL BACKLIGHT
Power
Supply
Slide Switch t
o
9-36 VDC
Figure 4. Connections with Externally-Powered Backlight
It is possible to use the same transmitter (signal loop) power supply for the externally
powered backlight. The backlight circuit will draw 25 mA in addition to the loop circuit.

PD6800 Loop-Powered Process Meter 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
Setup and programming is done through the infrared through-glass SafeTouch®
buttons, or using the mechanical buttons when uncovered. There are two slide
switches located on the connector board. One is used to select backlight power (if
equipped) and the other is to lock or unlock the SafeTouch®buttons.

PD6800 Loop-Powered Process Meter Instruction Manual
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SafeTouch®Buttons
The PD6800 is equipped with four sensors that operate as through-glass buttons so
that it can be programmed and operated without removing the cover (and exposing
the electronics) in a hazardous area. These buttons can be disabled for security by
selecting the LOCK setting on the switch located on the connector board in the base
of the enclosure. To actuate a button, press one finger to the glass directly over the
marked button area. When the cover is removed, the four mechanical buttons located
next to the sensors are used. The sensors 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 interference
and to protect against false triggering, however, it is recommended that the
SafeTouch®buttons be disabled (slide switch to LOCK) if there is an infrared
interference source in line-of-sight to the display.
SafeTouch®Button Tips:
To remove cover with power applied (safe area only), or to clean the window,
select SERVICE in the main menu before opening the cover. This will temporarily
disable the SafeTouch®buttons for 60 seconds to prevent inadvertent use. Use
the mechanical buttons while the meter is open.
To the extent possible, install the display facing away from sunlight, windows,
reflective objects and any sources of infrared interference.
Keep the glass window clean.
Tighten the cover securely.
Use a password to prevent tampering.
After all connections have been completed and verified, apply power to the loop.

PD6800 Loop-Powered Process Meter Instruction Manual
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Buttons and Display
ENTER
DISPLAYRESET
MENU
Button
Symbol Description Symbol Status
MEN
U
Menu HI High Alarm Set
RESET
Right arrow/Reset LO Low Alarm Set
Up arrow/Display Password Enabled
Enter
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 in-
crement the value of a digit.
Press the Enter button to access a menu or to accept a setting.
Press and hold the Menu button for five seconds to access the Advanced fea-
tures of the meter.
ENTER
DISPLAY

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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 Setup Enter Setup menu
DeC..pt Decimal point Enter Decimal Point 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
Span
Error Span
Error Error, calibration not successful, check signal
tag Tag/Units Enter the Tag/Units Menu
ON Tag On Enable Tag/Units
OFF Tag Off Disable Tag/Units
PASSWRD Password Enter the Password menu
UNLOCKD Unlocked Program password to lock meter
LOCKED Locked Enter password to unlock meter
99999
-99999 Flashing
display Overrange condition
Underrange condition
SERVICE Service Select before removing/installing cover for ser-
vice or to clean the glass window

PD6800 Loop-Powered Process Meter Instruction Manual
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Main Menu
The main menu consists of the most commonly used functions: Setup, Password,
and Service.
Press MENU button to enter Programming Mode then press the Up Arrow button to
scroll through the main menu.
Press MENU, at any time, to exit and return to Run Mode. Changes made to
settings prior to pressing Enter are not saved.
Changes to the settings are saved to memory only after pressing Enter.
The display moves to the next menu every time a setting is accepted by
pressing Enter.

PD6800 Loop-Powered Process Meter Instruction Manual
20
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 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.
Setting Up the Meter (SETUP)
Press the Enter button to access any menu or press Up arrow button to scroll
through choices. Press the Menu button to exit at any time.