Precision Digital Corporation ProtEx PD6870-SS User manual

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
•Fully-Approved Stainless Steel Explosion-Proof Loop-Powered Process Meter
•4-20 mA Input
•1 Volt Drop (4 Volt Drop with Backlight)
•1.0" (25.4 mm) 3½ Digits LCD Display; -1000 to 1999
•Display Mountable at 0°, 90°, 180°, & 270°
•HART® Protocol Transparent
•Loop-Powered Backlight
•Operating Temperature Range: -40 to 75°C (-40 to 167°F)
•Installation Temperature Range: -55 to 75°C (-67 to 167°F)
•Zero & Span Potentiometer Adjustments for Easy Field Scaling
•Conformal Coated PCBs for Dust and Humidity Protection
•CSA Certified as Explosion-Proof / Dust-Ignition Proof / Flame-Proof
•Wide Viewing Angle
•Flanges for Wall or Pipe Mounting
•Explosion-Proof, IP68, NEMA 4X 316 Stainless Steel Enclosure
•Two 3/4" NPT or M20 Conduit Openings
•2" U-Bolt Kit Available
•Stainless Steel Tag Available
•3-Year Warranty

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Table of Contents
Introduction......................................................................................................... 3
Ordering Information.......................................................................................... 4
Physical Features............................................................................................... 5
Great for Cold Temperatures ........................................................................ 5
Wide Viewing Angle....................................................................................... 5
Easy Pipe Mounting....................................................................................... 6
Rotatable Display Module.............................................................................. 6
Tamper-Proof Capability................................................................................ 6
Stainless Steel Tag Attaching Loop ............................................................. 6
Accessories ........................................................................................................ 7
Useful Tools........................................................................................................ 7
Specifications..................................................................................................... 8
General............................................................................................................ 8
Input ................................................................................................................ 8
Enclosure........................................................................................................ 8
Product Ratings and Approvals.................................................................... 9
Electromagnetic Compatibility...................................................................... 9
EU Declaration of Conformity............................................................................... 9
Safety Information.............................................................................................. 9
Installation......................................................................................................... 10
Unpacking..................................................................................................... 10
Mounting....................................................................................................... 10
Dimensions................................................................................................... 10
Cover Jam Screw ......................................................................................... 11
Connections ................................................................................................. 11
Wiring Diagrams........................................................................................... 11
Setup ................................................................................................................. 12
Overview....................................................................................................... 12
Scaling Controls and Display...................................................................... 12
Setting Up the Meter .................................................................................... 12
Setting the Decimal Point........................................................................... 12
Minimum & Maximum Input Span.......................................................... 12
Calibrating the Meter.................................................................................. 12
Factory Default & User Settings.................................................................. 13
Troubleshooting............................................................................................... 13
Troubleshooting Tips................................................................................... 13
Table of Figures
Figure 1. Enclosure Dimensions - Front View................................................ 10
Figure 2. Enclosure Dimensions - Side View................................................. 10
Figure 3. Enclosure Dimensions - Top View.................................................. 10
Figure 4. Connector Board .............................................................................. 11
Figure 5. Connections without Backlight....................................................... 11
Figure 6. Connections with Loop-Powered Backlight................................... 11

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Disclaimer
The information contained in this document
is subject to change without notice. Precision
Digital Corporation makes no representations
or warranties with respect to the contents hereof;
and specifically disclaims any implied warranties
of merchantability or fitness for a particular
purpose.
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
•Failure to follow installation guidelines could
result in death or serious injury. Make sure only
qualified personnel perform the installation.
•Never remove the meter cover in explosive
environments when the circuit is alive.
•Cover must be fully engaged to meet
flameproof/explosion-proof requirements.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
© 2022 Precision Digital Corporation.
All rights reserved.
Introduction
The ProtEX-FarVu PD6870-SS is a rugged, stainless
steel, explosion-proof, loop-powered meter with 1"
display digits ideal for demanding applications in
hazardous areas or in the harshest environmental
conditions. It will operate down to -40°C and can be
installed in areas where the temperature gets as cold
as -55°C, however, the display will cease functioning.
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.
The meter is programmed using four easy to access
front-mounted potentiometers with no complex or difficult
to read programmingmenus necessary for setup.
The numeric display will read from -1000 to 1999 over
a 2000 count user adjustable scaling span. The
backlight feature 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
backlight can be enabled or disabled via alternative
wiring of terminal block.
The enclosure is provided with two conduit openings.
The cast-in mounting flanges on the enclosure make
it convenient for pipe or wall mounting.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Ordering Information
Model
Description
PD6870-0K0-SS
Stainless Steel Explosion-
Proof Loop-Powered
Process Meter with
Backlight and Two 3/4"
Conduit Openings
PD6870-0K0-SS-M20
Stainless Steel Explosion-
Proof Loop-Powered
Process Meter with
Backlight and Two M20
Conduit Openings
Accessories
Model
Description
PDAPLUG75
3/4" NPT 316 Stainless
Steel Conduit Plug with
Approvals
PDAPLUGM20
M20 316 Stainless Steel
Conduit Plug with
Approvals
PDAREDUCER-75M-M20F
M-3/4" NPT to F-M20
Reducer with Approvals
PDAREDUCER-75M-50F
M-3/4" NPT to F-1/2" NPT
Reducer with Approvals
PD9501
Multi-Function Calibrator
PD9502
Low-Cost Signal Generator
PDA1001
USB Power Bank
PDA1002
6" DIN Rail Mounting Kit
PDA1024-01
24 VDC Power Supply for
DIN Rail
PDA-SSTAG
Custom Stainless Steel
Tag (see website for
convenient ordering form)
PDA6846-SS
Stainless Steel 2" U-Bolt
Kit. All Material: Stainless
Steel; (1) U-Bolt for 2" Pipe
with (2 each) Washers,
Lock Washers, and Nuts
Note: Unless otherwise specified, the above accessories do not
carry hazardous area approvals and are thus not suitable for
location in hazardous areas.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Physical Features
The ProtEX-FarVu PD6870-0K0-SS comes with two ¾" NPT conduit openings and the PD6870-0K0-SS-M20 comes
with two M20 conduit openings.
Great for Cold Temperatures
The ProtEX-FarVu PD6870-SS will operate over a
temperature range of -40 to 75°C (-40 to 167°F).
Below -40°C, the display will cease functioning,
however, the instrument is approved to be installed in
locations where the temperature goes down to -55°C.
Wide Viewing Angle
The window and display module have been optimized
to provide a wide viewing angle of approximately
±40°; nearly twice that of the competition.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Easy Pipe Mounting
The ProtEX-FarVu comes with cast-in mounting
flanges. These allow easy mounting to walls or pipes
using the PDA6846-SS Stainless Steel 2" U-Bolt Kit.
A slot on the back of the enclosure makes it easy to
center the unit on a pipe.
Rotatable Display Module
The display module can be rotated in 90° increments
providing added mounting flexibility. Plus the various
conduit connections allow a variety of installation
options.
Tamper-Proof Capability
The instrument can be made tamper-proof by insert-
ing a wire through the cast-in loop on the base of the
enclosure and a hole in the lid of the enclosure and
securing this wire with a lead seal.
Stainless Steel Tag Attaching
Loop
The enclosure is equipped with a loop at the top to
easily attach a PDA-SSTAG stainless steel tag.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Accessories
PDA1024-01 24 VDC Power Supply
The PDA1024-01 is a DIN rail mounted 1.5 A,
24 VDC power supply that can be used to power
the 4-20 mA transmitter.
PDA6846-SS 2"U-Bolt Kit
The PDA6846-SS U-Bolt Kit provides a convenient
way to mount the PD6870-SS to 1.5" or 2" pipes.
PDA-SSTAG Stainless Steel Tag
The PDA-SSTAG is a laser etched stainless steel tag
that can be customized with three lines of text. Each
tag comes with a stainless steel wire and lead seal for
easy mounting wherever you need.
Dimensions
Useful Tools
PD9501 Multi-Function Calibrator
This PD9501 Multi-Function Calibrator has a variety
of signal measurement and output functions, including
voltage, current, thermocouple, and RTD.
PD9502 Low-Cost Signal Generator
The PD9502 is a low-cost, compact, simple to use
4-20 mA or 0-10 VDC signal generator. It can easily
be set for 0-20 mA, 4-20 mA, 0-10 V or 2-10 V rang-
es. Signal adjustment is made with a one-turn knob. A
15-27 VDC wall plug is provided with the instrument.
Optional USB power bank is available.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Specifications
Except where noted all specifications apply to operation at +25°C.
General
Display
3½ digit LCD
1" (25.4 mm); -1000 to 1999
Display
Orientation
Display may be mounted at 90° increments
up to 270° from default orientation.
Display
Update Rate
2.5 Updates/Second
Backlight
White; Loop-powered. Backlight can be
enabled or disabled via alternative wiring of
terminal block. Loop-powered backlight
brightness will increase as the input signal
current increases.
Display
Overrange
Display reads 1 on the left most digit
Programming
Method
Four (coarse and fine for zero and span)
potentiometers 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: -55 to 75°C
Installation temperature range: -55 to 75°C
Relative humidity: 0 to 90% non-condensing
Printed circuit boards are conformally coated.
Connections
Screw terminals accept 12 to 22 AWG wire
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 Dimensions on page 10.
Overall
Dimensions
5.25" x 5.65" x 4.80"
(133 mm x 144 mm x 122 mm)
(W x H x D)
Weight
8.7 lbs (139 oz, 3.95 kg)
Warranty
3 years parts and labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.
Input
Input
4-20 mA
Accuracy
±0.1% of full span ±1 count
Maximum
Voltage Drop &
Equivalent
Resistance
Without
Backlight
With Loop-Powered
Backlight
1 VDC @ 20 mA
4 VDC @ 20 mA
50 Ω @ 20 mA
200 Ω @ 20 mA
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.
Input Overload
Over current protection to 2 A max.
HART
Transparency
The meter does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The meter is not
affected if a HART communicator is
connected to the loop. The meter does
not display secondary HART variables.
Enclosure
Material
ASTM A743 CF8M investment-cast
316 stainless steel
Gasket (O-Ring)
Fluoroelastomer
Rating
NEMA 4X, IP68 Explosion-proof
Color
Silver
Window
Borosilicate glass
Conduits
PD6870-0K0-SS: Two 3/4" NPT conduit
openings
PD6870-0K0-SS-M20: Two M20 conduit
openings
Flanges
Two built-in flanges provided for wall and
pipe mounting.
Tamper-Proof
Seal
Cover may be secured with tamper-proof
seal.
ATEX & IECEx
(enclosure only)
Flameproof protection
II 2GD
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68
Tamb: -55°C to +85°C
Certificate No.: Sira 19ATEX1252U
Certificate No.: IECEx SIR 19.0075U
CSA
(enclosure only)
Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Group E, F, G
Class III
Ex db IIC Gb; Ex tb IIIC Db
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate No.: 80011200
UL
(enclosure only)
Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Groups E, F, G
Class III
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC
Ex db IIC Gb; Ex tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate Number: E518920
Note: The above approvals are for the enclosure only. See next page
for approval on the entire instrument.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Product Ratings and Approvals
CSA
Explosion-proof for use in:
Class I, Division 1, Groups B, C and D
Dust-ignition proof for use in:
Class II/III, Division 1, Groups E, F and G; T6
Flame-proof for use in:
Zone 1, Ex d IIC T6
Ta = -55 to 75°C.
Enclosure: Type 4X & IP66/IP68.
Certificate number: 2325749
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 mechani-
cal damage. The cable shall not be subjected to ten-
sion 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.
Electromagnetic Compatibility
Emissions
EN 61326-1
Safety requirements for measurement,
control, and laboratory use –Industrial
Group 1 Class A ISM emissions
requirements
Radiated
Emissions
Class A
Immunity
EN 61326-1
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
EU Declaration of Conformity
For shipments to the EU and UK, a Declaration of
Conformity was printed and included with the product.
For reference, a Declaration of Conformity is also
available on our website www.predig.com/docs.
Safety Information
•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-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
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Installation
For Installation in USA: The PD6870-SS must be
installed in accordance with the National Electrical
Code (NEC) NFPA 70.
For Installation in Canada: The PD6870-SS 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.
•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.
All controls and wiring connections are located on the
display module that is accessed by removing the enclo-
sure cover. The controls can be accessed without re-
moving the display module. The wiring connections can
be accessed by removing the display module which is
secured to the enclosure by two captive screws.
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 malfunc-
tions, please contact your supplier or the factory for
assistance.
Mounting
The PD6870-SS 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 Figure 1 and Figure 2.
•Do not attempt to loosen or remove flange bolts
while the meter is in service.
Dimensions
All units: inches (mm)
Figure 1. Enclosure Dimensions - Front View
Figure 2. Enclosure Dimensions - Side View
Figure 3. Enclosure Dimensions - Top View

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
11
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 flame-
proof 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.
•Excess torque may damage the threads and/or
wrench.
Connections
To access the wiring connections, remove the enclo-
sure cover and unscrew the two captive screws that
fasten 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 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 4 for terminal positions.
•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.
•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.
Figure 4. Connector Board
Wiring Diagrams
Signal connections are made to a three-terminal con-
nector 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 5.
The loop-powered backlight configuration requires a
total maximum voltage drop of 4 V. The backlight op-
tion is recommended for dim lighting conditions and is
enabled when wired as shown in Figure 6.
Figure 5. Connections without Backlight
Figure 6. Connections with Loop-Powered Backlight

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
12
Setup
Overview
Setting the 4-20 mA input for the desired display is
done using a calibrated 4-20 mA signal source and
the four potentiometers located on the front of the
display module. The cover must be removed to ac-
cess these potentiometers. There is also a jumper
array for setting the decimal point.
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.
Setting Up the Meter
Setting the Decimal Point
A decimal point may be set using a three-position
jumper array located on the rear of the display
module. To access the jumper array, 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.
Minimum & Maximum Input Span
A minimum input span of 20 counts is required be-
tween the 4 mA and 20 mA inputs. A maximum input
span of 2000 counts may be setup between the 4 mA
and 20 mA input.
The meter will not calibrate properly if these minimum
and maximum span ranges are not maintained during
scaling.
Calibrating the Meter
The meter is provided factory calibrated to display
-50.0 at 4 mA and 150.0 at 20 mA.
Apply a 4 mA signal and adjust the LO potentiometers
(coarse and fine) to display the desired reading. Apply
a signal between 16 and 20 mA and adjust the HI
potentiometers (coarse and fine) to display the de-
sired reading. Complete the calibration procedure by
making minor adjustments to the LO and HI fine po-
tentiometers as necessary.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
13
Factory Default & 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
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 recom-
mendations below.
Troubleshooting Tips
Symptom
Check/Action
No display
Check input signal connections.
Display unsteady
during calibration
Adjust LO FINE or HI FINE con-
trols 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.
Backlight does not
appear
Verify backlight is installed.
Check signal connections are as
shown in Figure 5 on page 11.
Other symptoms not
described above
Call Technical Support for
assistance.

PD6870-SS Explosion-Proof Loop-Powered Process Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
LIM6870-SS_A
10/22
Contact Precision Digital
Technical Support
Call: [phone] or [phone]
Fax: [phone]
Email: [e-mail]
Sales Support
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Fax: [phone]
Email: [e-mail]
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For the latest version of this manual please visit
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