Precision Digital Corporation ProtEx One PD6870 User manual

PRECISION DIGITAL CORPORATION
89 October Hill Road • Holliston MA 01746 USA
Tel [phone] • Fax [phone] www.predig.com
PD6870 EXPLOSION-PROOF
LOOP-POWERED PROCESS METER
4-20 mA input
1 V drop (4 V with Backlight)
3½ Digits LCD, 1" High
Loop-Powered Backlight Option
HART®Protocol Transparent
Explosion-Proof, IP68, NEMA 4X Enclosure
Flanges for Wall or Pipe Mounting
Easy Calibration and Installation
Operates from -40 to 75°C

PD6870 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/explsion-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 Precision Digital Corporation. All rights reserved.
www.predig.com

PD6870 Loop-Powered Process Meter Instruction Manual
3
INTRODUCTION
The ProtEX-One PD6870 is a rugged, loop-powered meter with 1" display digits in an
explosion-proof enclosure 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 with a small 1 volt drop for easy installation in almost any system.
It is programmed using four easy to access front-mounted control dials with no
complex or difficult to read programming menus necessary for setup. The numeric
display will read from -1999 to 1999 over a 2000 count user adjustable scaling span.
The backlight option lets you see the display under any lighting condition and is
powered from the 4-20 mA loop with no additional power supply required.
The enclosure is provided with two threaded conduit holes and integrated pipe or wall
mounting slotted flanges.
ORDERING INFORMATION
Model Description
PD6870-0L0 Explosion-Proof Loop-Powered Process Meter
PD6870-0K0 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

PD6870 Loop-Powered Process Meter Instruction Manual
4
Table of Contents
INTRODUCTION---------------------------------------------------------------------- 3
ORDERING INFORMATION------------------------------------------------------- 3
SPECIFICATIONS-------------------------------------------------------------------- 5
General -------------------------------------------------------------------------------------------5
Input -----------------------------------------------------------------------------------------------6
Product Ratings and Approvals ---------------------------------------------------------7
Electromagnetic Compatibility-----------------------------------------------------------8
SAFETY INFORMATION----------------------------------------------------------- 8
INSTALLATION----------------------------------------------------------------------- 9
Unpacking ------------------------------------------------------------------------------------- 10
Pre-Installed Conduit Plug--------------------------------------------------------------- 10
Mounting--------------------------------------------------------------------------------------- 10
PD6870 Connections ---------------------------------------------------------------------- 11
Connections & Wiring Diagrams................................................................ 12
SETUP----------------------------------------------------------------------------------13
Scaling Controls and Display----------------------------------------------------------- 13
Setting Up the Meter ----------------------------------------------------------------------- 14
Calibrating the Meter .................................................................................14
Setting the Decimal Point .......................................................................... 14
Factory Defaults & User Settings ----------------------------------------------------- 15
TROUBLESHOOTING -------------------------------------------------------------16
Troubleshooting Tips---------------------------------------------------------------------- 16
MOUNTING DIMENSIONS--------------------------------------------------------17
EC DECLARATION OF CONFORMITY---------------------------------------19
Table of Figures
Figure 1. PD6870 Connectors .................................................................11
Figure 2. PD6870 Input Connections without Backlight .......................12
Figure 3. PD6870 Input Connections with Loop-Powered Backlight...12
Figure 4. Enclosure Dimensions – Front View ......................................17
Figure 5. Enclosure Dimensions – Side Cross Section View...............18

PD6870 Loop-Powered Process Meter Instruction Manual
5
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
DISPLAY 3 ½ digit LCD
1" (25.4 mm); -1999 to 1999
DISPLAY
UPDATE RATE 2.5 Updates/Second
OVERRANGE Display reads 1 on the left most digit
PROGRAMMING
METHOD Four front mounted rotary control dials accessed when the cover is removed.
RECALIBRATION Recalibration is recommended at least every 12 months.
NORMAL MODE
REJECTION 60 dB rejection ratio
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, 0.30% max copper content, corrosion resistant epoxy coating, color:
blue. NEMA 4X, IP68.
Two ¾" NPT threaded conduit openings. One ¾" NPT nickel
plated brass conduit plug with 10 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 17.
OVERALL
DIMENSIONS 5.65" x 5.25" x 4.86" (144 mm x 133 mm x 124 mm) (W x H x D)
WEIGHT 5.00 lbs (80 oz, 2.27 kg)
WARRANTY 3 years parts and labor

PD6870 Loop-Powered Process Meter Instruction Manual
6
Input
ACCURACY ±0.1% of full span ±1 count
TEMPERATURE
DRIFT 150 PPM/C from -40 to 75C ambient
DECIMAL POINT User selectable decimal point
CALIBRATION
RANGE 4 mA input: -1000 to +1000; 20 mA between 20 and 2000
counts greater than 4 mA display.
Two point linear display span.
MAXIMUM
VOLTAGE DROP Without Backlight With Loop-Powered Backlight
1 VDC @ 20 mA 4 VDC @ 20 mA
EQUIVALENT
RESISTANCE 50 Ω@ 20 mA 200 Ω@ 20 mA
INPUT
OVERLOAD Over current protection to 2 A max.

PD6870 Loop-Powered Process Meter Instruction Manual
7
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
ATEX Certificate: 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 IECEx SIR 10.0056X
Ex d IIC T6 Gb
Ex tb IIIC T85°C Db IP68
Ta = -40°C to +75°C
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 PD6870 must be installed in accordance with the
ATEX directive 94/9/EC, and the product certificate Sira 10ATEX1116X.

PD6870 Loop-Powered Process Meter Instruction Manual
8
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

PD6870 Loop-Powered Process Meter Instruction Manual
9
INSTALLATION
For Installation in USA: The PD6870 must be installed in accordance with the
National Electrical Code (NEC) NFPA 70.
For Installation in Canada: Install in accordance with applicable local and national
regulations (e.g. NEC). The PD6870 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 PD6870 must be installed in accordance with the
ATEX directive 94/9/EC and the product certificate Sira 10ATEX116X.
All controls and wiring connectors are accessed by opening the enclosure. To access
electrical connectors, remove the 2 captive screws and remove the display module
from the enclosure.
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.

PD6870 Loop-Powered Process Meter Instruction Manual
10
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 Plug
The PD6870 is supplied with one pre-installed optional conduit plug for installations
that do not require the use of both conduit entries. The conduit plug includes an
internal hexagonal socket recess for removal. The pre-installed plug and installation
is included in all hazardous area approvals of the PD6870.
WARNING
Installations of the supplied conduit plug require the application of
non-setting (solvent free) thread sealant. If the pre-installed conduit
plug is removed or replaced all relevant hazardous area guidelines
must be followed for its installation or replacement conduit.
Mounting
The PD6870 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 17 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.

PD6870 Loop-Powered Process Meter Instruction Manual
11
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. Remove the display module. Signal
connections are made to a three-terminal connector on the rear of the display
module. Grounding connections are made to the two ground screws provided on the
base – one internal and one external.
S+ 4-20 mA signal input positive terminal connection
S- 4-20 mA signal return/negative terminal connection
B- 4-20 mA signal return/negative terminal when using the installed loop
powered backlight option.
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.
Figure 1. PD6870 Connectors

PD6870 Loop-Powered Process Meter Instruction Manual
12
Connections & Wiring Diagrams
Signal connections are made to a three-terminal connector mounted on the rear of
the display module. The enclosure also provides one internal and one external earth
grounding screw. The 4-20 mA input with no backlight has a maximum voltage drop
of 1 V and is wired as shown in Figure 2. The loop-powered backlight configuration
requires a total maximum voltage drop of 4 V. The backlight option is recommended
for dim lighting conditions and is enabled when wired as shown in Figure 3.
Figure 2. PD6870 Input Connections without Backlight
Figure 3. PD6870 Input Connections with Loop-Powered Backlight

PD6870 Loop-Powered Process Meter Instruction Manual
13
SETUP
Overview
Setup is done using four rotary control dials located on the front of the display
module that are accessed when the meter cover is removed. Setup is performed
using a 4-20 mA signal source and scaling the 4 and 20 mA readings using the
control dials.
Scaling Controls and Display
Control Description
LO 4 mA display adjust.
LO FINE 4 mA precision display adjust.
HI 20 mA display adjust.
HI FINE 20 mA precision display adjust.

PD6870 Loop-Powered Process Meter Instruction Manual
14
Setting Up the Meter
Calibrating the Meter
The meter is provided factory calibrated to display -50.0 at 4 mA and 150.0 at 20 mA.
HI and LO coarse and fine controls are labeled on the front of the display. Use the HI
and LO controls for large range changes during calibration and the HI FINE and LO
FINE controls for precision changes.
Apply a 4 mA signal and adjust the LO controls to display the desired reading. Apply
a signal between 16 and 20 mA and adjust the HI controls to display the desired
reading. Complete the calibration procedure by making minor adjustments to the LO
and HI controls as necessary.
Minimum & Maximum Input Span
A minimum input span of 20 counts is required between a 4 mA and 20 mA input. A
maximum input span of 2000 counts may be setup between a 4 mA and 20 mA input.
The meter will not properly calibrate or display if these minimum and maximum span
ranges are not maintained during scaling.
Setting the Decimal Point
Decimal point may be set using a three position jumper on the rear of the display
module. To access the connectors, unscrew the two captive screws that fasten the
display module. Remove the display module and place the jumper on the desired
pins as indicated on the board for decimal point locations of D.DDD, DD.DD, DDD.D,
or remove it if no decimal point is desired.

PD6870 Loop-Powered Process Meter Instruction Manual
15
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 Default
Setting User Setting
Decimal point 1 place
Calibration Settings
Input 1 4.00 mA
Display 1 -50.0
Input 2 20.00 mA
Display 2 150.0

PD6870 Loop-Powered Process Meter Instruction Manual
16
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 Check input signal connections.
Rate display unsteady during
calibration Adjust LO FINE or HI FINE controls to fine-tune the display.
Meter displays 1on the left
most digit location Check signal level is not over range.
Dial down the HI control and re-
calibrate at 20 mA.
Display is faded Check input signal is not under
1 mA.
If the display locks up or the
meter does not respond at all Perform hard reset by shorting S+ and S- terminals.
Backlight does not appear Verify backlight is installed.
Check signal connections are as
shown in Figure 3 on page 12.
Other symptoms not described
above Call Technical Support for assistance.

PD6870 Loop-Powered Process Meter Instruction Manual
17
MOUNTING DIMENSIONS
All units: inches [mm]
3.35[85.1]
2.25[57.1]
0.32[8.2]
5.65[143.5]
5.25[133.4]
Figure 4. Enclosure Dimensions – Front View

PD6870 Loop-Powered Process Meter Instruction Manual
18
3.35[85.0]
4.15[105.5]
3.22[81.9] 4.86[123.5]
Figure 5. Enclosure Dimensions – Side Cross Section View
Note: The supplied conduit plug may extend up to 0.6 in [15 mm] from the conduit
opening when installed.

PD6870 Loop-Powered Process Meter Instruction Manual
19
EC DECLARATION OF CONFORMITY
Issued in accordance with ATEX Directive 94/9/EC
Manufacturer: Precision Digital Corporation
89 October Hill Rd Ste 5
Holliston, MA 01746 USA
Device: PD6870 Series Process Meter
Notified Body: Sira Certification Service, notified body no. 0518
Rake Lane, Eccleston, Chester, CH4 9JN, England
EC Type Examination Certificate: Sira 10ATEX1116X
Quality Assurance Notification No.: SIRA 10 ATEX M462
Compliance with Standards: Product Markings:
EN 60079-0:2009 II 2 G D
EN 60079-1:2007 Ex d IIC T6 Gb
EN 60079-31:2008 Extb IIIC T85°C Db IP68
EN 61326:2006 Tamb -40°C to +75°C
IEC 61010-1:2001 & EN 61010-1:2001, including Group and National
Differences as they apply for AU, CA, US and KR
Community Directives:
94/9/EC ATEX Directive
2004/108/EC EMC Directive
Name: Jeffrey Peters
Company: Precision Digital Corporation
Title: President
Date: 1/1/2011

PD6870 Loop-Powered Process Meter Instruction Manual
LIM6870_E
08/09
How to Contact Precision Digital
For Technical Support:
Call: [phone] or [phone]
Fax: [phone]
Email: [email protected]
For Sales Support:
Call: [phone] or [phone]
Fax: [phone]
Email: [email protected]
For the latest version of this manual please visit:
www.predig.com