Precision Digital Corporation ProtEX-MAX PD8-6100 User manual

PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • Fax [phone]
www.predig.com
•Fully-Approved Explosion-Proof Meter
•15, 30, 150, 300 mV unipolar; ±15, ±25, ±150, ±250 mV bipolar Inputs
•Dual-Line 6-Digit Display, 0.6" (15 mm) & 0.46" (12 mm)
•Selectable 5 or 10 VDC Sensor Excitation @ 25 mA Max
•SafeTouch Through-Glass Button Programming
•Display Mountable at 0°, 90°, 180°, & 270°
•4 Relays with Interlocking Capability + Isolated 4-20 mA Output Option
•Free PC-Based, On-Board, MeterView Pro USB Programming Software
•SunBright Display Standard Feature; Great for Outdoor Applications
•Operating Temperature Range: -40 to 60°C (-40 to 140°F)
•FM Approved as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
•CSA Certified as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
•ATEX and IECEx Certified as Flame-Proof
•Input Power Options: 85-265 VAC / 90-265 VDC or 12-24 VDC / 12-24 VAC
•Supports One (1) 350 Ω Load Cell
•Capture or Programmable Tare Feature
•Auto-Zero Feature Eliminates Zero Drift
•Ratiometric Operation
•Programmable Display, Function Keys & Digital Inputs
•Flanges for Wall or Pipe Mounting
•Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum Enclosure
•On-Board RS-485 Serial Communications
•Modbus RTU Communication Protocol Standard
•Password Protection
•Four 3/4" NPT Threaded Conduit Openings (Two Plugs Installed)
•Pipe Mounting Kits
•Stainless Steel Tag Available
•3-Year Warranty
MeterView Pro
USB Install

2

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
3
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.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
•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 live.
•Cover must be fully engaged to meet
explosion-proof/dust-ignition-proof/flame-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.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2022 Precision Digital Corporation.
All rights reserved.
FREE MeterView Pro
Programming Software
The meter can be powered from the USB connection. When
using the USB connection, DO NOT apply AC or DC power to
the meter.
The easiest and quickest way to program your
ProtEX-MAX meter is to use the FREE MeterView Pro
programming software. This software is loaded into
the meter and connects and installs directly to your
PC with a USB cable. We recommend that the first
thing you do after taking the meter out of the box is
connect the ProtEX-MAX to your PC with the provided
USB cable –do not use a different cable. DO NOT
apply AC or DC power to the meter while your PC is
connected to the meter as it will disrupt the USB
connection. You don’t even have to apply an input
signal.
MeterView Pro programming software is intuitive, and
most customers can get their meter programmed as
they like without even looking in the manual.
Watch MeterView Pro Software Video at
www.predig.com/meterviewpro
In addition to programming, the software may be used
for:
•Monitoring
•Datalogging using your PC
•Generating and saving programming files for
later use
Once your meter is programmed the way you want it,
you can wire it up for your application per the
instructions in this manual and install it. If you find that
you need to make adjustments to the programming
after the meter is installed, you can use the
programming panel buttons and the instructions in
this manual to do so.
•When using the USB connection, the meter
should only be connected to a computer when
both devices are in a non-hazardous area.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
4
Table of Contents
Introduction......................................................................................................... 7
Ordering Information.......................................................................................... 7
Key Features....................................................................................................... 9
Specifications................................................................................................... 14
General.......................................................................................................... 14
Strain Gauge Input....................................................................................... 15
Relays............................................................................................................ 15
USB Connection........................................................................................... 15
Isolated 4-20 mA Transmitter Output Option............................................. 16
RS-485 Serial Communications .................................................................. 16
Modbus®RTU Serial Communications....................................................... 16
Digital Input (F4)........................................................................................... 16
MeterView Pro Software .............................................................................. 16
Compliance Information................................................................................... 17
Electromagnetic Compatibility.................................................................... 17
Product Ratings and Approvals.................................................................. 17
EU Declaration of Conformity.......................................................................... 18
Safety Information............................................................................................ 18
Installation......................................................................................................... 18
Unpacking..................................................................................................... 18
Mounting....................................................................................................... 19
Installation Overview ................................................................................... 21
MeterView Pro Software .............................................................................. 21
Sensor Excitation Voltage Selection (EX+, EX-)........................................ 22
Connections ................................................................................................. 22
Required & Factory Wired Connection....................................................... 22
PROVUElectronics Module Layout............................................................. 23
USB Connection ........................................................................................ 23
Power Connections.................................................................................... 24
Signal Connections.................................................................................... 25
Switch Configuration.................................................................................. 25
Shunt Calibration ....................................................................................... 27
Relay Connections..................................................................................... 27
Interlock Relay Feature.............................................................................. 27
Switching Inductive Loads.......................................................................... 28
RS-485 Connections.................................................................................. 28
RS-485 Multi-Drop Connection.................................................................. 28
F4 Digital Input Connections...................................................................... 29
4-20 mA Output Connections..................................................................... 29
Analog Output Power Supply..................................................................... 29
Remote Programming................................................................................ 29
Setup and Programming.................................................................................. 30
Overview....................................................................................................... 30
LED Status Indicators.................................................................................. 30
Programming Buttons ................................................................................. 31
SafeTouch Buttons ...................................................................................... 31
Display Functions & Messages................................................................... 32
Main Menu..................................................................................................... 34
Setting Numeric Values............................................................................... 34
Setting Up the Meter (setup)....................................................................... 34
Setting the Input Signal (Input)................................................................. 35
Setting the Display Units (units)............................................................... 35
Setting the Display Units or Custom Tags (units).................................... 36
Programming the Meter (prog).................................................................. 36
Calibrating the Meter with Strain Gauge/Load Cell (Cal)........................... 37
Setting the Display Parameter & Intensity (dsplay) .................................. 39
Display Intensity (d-Inty).......................................................................... 39
Setting the Relay Operation (relay)........................................................... 40
Setting the Relay Action............................................................................. 40
Programming Set and Reset Points........................................................... 41
Setting Fail-Safe Operation........................................................................ 41
Programming Time Delay .......................................................................... 41

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
5
Relay and Alarm Operation Diagrams........................................................ 41
High Alarm Operation (Set > Reset)............................................................. 41
Low Alarm Operation (Set < Reset)........................................................... 42
High Alarm with Fail-Safe Operation (Set > Reset).................................... 42
Low Alarm with Fail-Safe Operation (Set < Reset)..................................... 42
Time Delay Operation................................................................................ 42
Pump Alternation Control Operation.......................................................... 43
Relay Sampling Operation......................................................................... 43
Relay Operation Details............................................................................... 44
Overview.................................................................................................... 44
Relays Auto Initialization............................................................................ 44
Fail-Safe Operation.................................................................................... 44
Front Panel LEDs....................................................................................... 44
Latching and Non-Latching Relay Operation ............................................. 44
Non-Latching Relay (Auto)........................................................................ 45
Non-Latching Relay with Manual Reset (A-nman)...................................... 45
Latching Relay (LatcH).............................................................................. 45
Latching Relay with Clear (Lt-Clr)........................................................... 45
Acknowledging Relays............................................................................... 46
Pump Alternation Control Applications (Altern) ....................................... 46
Setting Up the Interlock Relay (Force On) Feature.................................... 47
Scaling the 4-20 mA Analog Output (Aout)................................................ 48
Reset Menu (reset)...................................................................................... 48
Tare Menu (Tare).......................................................................................... 48
Tare Functionality (tare)........................................................................... 48
Manual Control Menu (Contrl) ................................................................... 48
Setting Up the Password (pass).................................................................. 49
Protecting or Locking the Meter................................................................. 49
Making Changes to a Password Protected Meter...................................... 49
Disabling Password Protection .................................................................. 49
Advanced Features Menu............................................................................ 50
Advanced Features Menu & Display Messages......................................... 50
Noise Filter (filter) ................................................................................. 51
Noise Filter Bypass (bypass)..................................................................... 51
Rounding Feature (round)......................................................................... 51
Modbus RTU Serial Communications (serial)......................................... 51
Select Menu (SElect)................................................................................ 52
Input Signal Conditioning (Functn)............................................................ 52
Auto-Zero (Auto 0).................................................................................... 52
Low-Value Cutoff (CutofF)........................................................................ 52
Analog Output Programming (AoutPr) ...................................................... 53
Programmable Function Keys User Menu (user)...................................... 54
Internal Source Calibration (ICAL)............................................................. 55
Error Message (error).............................................................................. 55
Meter Operation................................................................................................ 56
Button Operation.......................................................................................... 56
SafeTouch Buttons ...................................................................................... 56
Function Keys Operation................................................................................. 57
Digital Inputs Operation............................................................................... 57
Maximum/Minimum Readings..................................................................... 57
Troubleshooting............................................................................................... 58
Diagnostics Menu (diag) ............................................................................. 58
Testing the Display LEDs........................................................................... 58
Determining Software Version ................................................................... 58
Reset Meter to Factory Defaults.................................................................. 58
Factory Defaults & User Settings............................................................... 59
Troubleshooting Tips................................................................................... 60

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
6
Table of Figures
Figure 1. Enclosure Dimensions –Front View............................................... 19
Figure 2. Enclosure Dimensions –Side Cross Section View ....................... 19
Figure 3. Sensor Excitation Voltage Selection............................................... 22
Figure 4. Integrated PROVURequired Connections....................................... 22
Figure 5. PROVUElectronics Module Layout.................................................. 23
Figure 6. USB Connection ............................................................................... 23
Figure 7. Power Connections.......................................................................... 24
Figure 8. Strain Gauge Configuration Switch ................................................ 25
Figure 9. Strain Gauge Powered by Internal Supply ..................................... 26
Figure 10. Strain Gauge Powered by External Supply .................................. 26
Figure 11. mV Transducer Input Connections............................................... 26
Figure 12. Four-wire mV Transducer Connections........................................ 26
Figure 13. Shunt Resistor................................................................................ 27
Figure 14. Relay Connections ......................................................................... 27
Figure 15. Interlock Connections.................................................................... 27
Figure 16. AC and DC Loads Protection......................................................... 28
Figure 17. Low Voltage DC Loads Protection................................................ 28
Figure 18. RS-485 Diagnostic LEDs................................................................ 28
Figure 19. Digital Input and Output Connections .......................................... 29
Figure 20. F4 Digital Input Connections......................................................... 29
Figure 21. 4-20 mA Output Connections ........................................................ 29
Figure 22. Analog Output Supply Powering Other Devices.......................... 29

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
7
Introduction
The ProtEX-MAX PD8-6100 is an explosion-proof
digital strain gauge & load cell meter, ideal for
weighing and force measurement applications. It
features a dual-line display, with a main display
0.60" (15 mm) high, and a second display of
0.46" (12 mm) high superluminous LED digits, which
can be read in any lighting condition, including direct
sunlight. The meter is housed in a die-cast aluminum,
field-mountable, NEMA 4X/IP68 rated enclosure for
convenient indoor and outdoor installation.
The meter accepts mV input signals up to 300 mV.
Three of the programming buttons can be
custom-programmed for a specific operation. The
mV input can be scaled to display the process in two
different scales; for example, pounds on the main
display and gallons on the second display.
A fully loaded ProtEX-MAX PD8-6100 meter comes
with four SPDT relays, a 4 20 mA output, one 10 VDC
sensor excitation, one 24 VDC power supply, five
digital inputs and four digital outputs, and onboard
RS-485 serial communications.
The four relays can be used for alarm indication or
process control applications. The 4-20 mA isolated
output, Modbus RTU serial communications, and
digital I/O features make the ProtEX-MAX an
excellent addition to any system.
SafeTouch Buttons
To make it possible to program and operate the
ProtEX-MAX in a hazardous area, the programming
buttons that are located behind the glass window can
be operated without removing the cover by using the
SafeTouch through-glass buttons. The operator puts
their finger on the glass over the button and the
button is actuated.
To learn more about SafeTouch buttons,
see this video:
predig.com/videos/Safetouch_Buttons
Ordering Information
85-265 VAC Models
Model
Standard
Features
Options
Installed
PD8-6100-6H0
5 Digital Inputs,
4 Digital Outputs,
RS-485
Communications
No options
PD8-6100-6H7
4 relays
4-20 mA output
12-24 VDC Models
Model
Standard
Features
Options
Installed
PD8-6100-7H0
5 Digital Inputs,
4 Digital Outputs,
RS-485
Communications
No options
PD8-6100-7H7
4 relays
4-20 mA output
Accessories
Model
Description
PDA0001
3/4" M-NPT to F-M20 Reducer
PDA0002
3/4" M-NPT to 1/2" F-NPT Reducer
PDAPLUG75
3/4" Metal Conduit/Stopping Plug
PDA-SSTAG
Custom Stainless Steel Tag (see
website for convenient ordering form)
PDA6848
2" U-Bolt Kit Zinc Plated Steel
PDA6848-SS
2" U-Bolt Kit Stainless Steel
PDA7485-I
RS-232 to RS-485 isolated converter
PDA8485-I
USB to RS-485 isolated converter

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
8
Helpful Videos
There are several videos that will help you get a
better understating of the features and functionality of
the ProtEX-MAX products. Since the ProtEX-MAX
meters have the same general features and
functionality of the ProVu meters, appropriate videos
for the ProVu meter are also included.
ProtEX-MAX Products Overview
Learn about the complete line of ProtEX-MAX
products.
predig.com/videos/ProtEXMAX_Overview
MeterView Pro Programming Software
Learn how easy it is to program the ProVu
(ProtEX-MAX) process meter using MeterView Pro
software.
predig.com/videos/MVPro_SW
MeterView Pro Software Demonstration
Learn how easy it is to program Precision Digital's
ProVu (ProtEX-MAX) process meter for a level
application using MeterView Pro PC-based
programming software.
predig.com/videos/MVPro_Demo
Connect to PC for Programming
Learn how to connect a ProVu (ProtEX-MAX) process
meter to your PC and install free MeterView Pro
programming software.
predig.com/videos/PC_Connect

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
9
Key Features
Connections for PD8-6100-6H7 & PD8-6100-7H7
The Only Explosion-Proof Strain Gauge and Load Cell Meter You Will Ever Need
The ProtEX-MAX PD8-6100 is a full-featured
multipurpose, easy-to use digital strain gauge & load
cell meter ideal for weight and force measurement
applications. The meter boasts specifications,
features and functionality that make it the only
hazardous area strain gauge and load cell meter you
will ever need.
The PD8-6100 has all the same features as our
PD6100 1/8 DIN meter, but it is not just a meter
stuffed in an explosion-proof enclosure like many of our
competitors offer. The PD8-6100 is approved as a
complete product by FM and CSA and also carries
IECEx approvals. Besides being suitable for
hazardous areas, the number one feature that makes
the PD8-6100 such a useful device is its built-in 5, 10
or 24 VDC power supply. This feature not only saves
the cost of an external power supply, but also greatly
simplifies wiring. In addition, there is a second
24 VDC @ 25 mA power supply provided with the
4-20 mA output option.
The first thing you notice about the PD8-6100 is its
modern looking, rugged, die-cast aluminum housing
with convenient mounting flanges. Housed inside this
enclosure is a dual-line, 6-digit display with high-intensity
LEDs that can be read indirect sunlight. The main display
can be programmed to indicate PV, maximum (peak),
minimum (valley), alternating max/min, one of four
alarm set points, or Modbus input. The second display
can also be configured to display engineering units,
set points, user defined legends, or simply turned off.
The four relays can be used for alarm indication or
process control such as pump alternation control. The
4-20 mA isolated output, Modbus RTU serial
communications, and digital I/O options make the
PD8-6100 an excellent addition to any system.
Finally, all these features and capabilities can easily
be programmed without removing the cover using
SafeTouch buttons in a hazardous area or with free
MeterView Pro PC-based software in a safe area.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
10
Easy Programming Methods
The ProtEX-MAX can be programmed in a hazardous
area with the through-glass SafeTouch buttons
without removing the cover, in a safe area with the
front panel push buttons with the cover removed, or in
a safe area with free, PC-based MeterView Pro
software. MeterView Pro is resident on the
ProtEX-MAX and is accessed by a provided USB
cable, so it is by far the easiest way to program the
ProtEX-MAX. The ProtEX-MAX can be calibrated
either by applying a known signal or scaled by
entering a desired value with the front panel buttons
or MeterView Pro software. Most customers will use
the scaling method because it is simpler and does not
require a calibrated signal source. Selecting the input
to be current or voltage is done with the front panel
buttons or MeterView Pro software. Once
programming is completed it can be locked with a
password.
The ProtEX-MAX comes preloaded with free
MeterView Pro programming software that connects
and installs directly to your PC with a standard USB
cable, also provided free with each instrument. This
eliminates the need to insert CDs, install drivers, or
download software from the internet. When you
connect your ProtEX-MAX to your PC, MeterView Pro
is downloaded to your PC, the software automatically
selects the model you are programming, and you’re
ready to start programming immediately. Further
simplifying the programming process, the
ProtEX-MAX can be powered from the USB port, so
no need to apply external power while programming
your meter. In addition to programming, the software
will also allow you to monitor, and datalog a
ProtEX-MAX using your PC. You can also generate
and save programming files for later use.
Feature Rich and Flexible
Zero the Meter
The zero function zeroes out the display. In the case
where there has been drift in the strain gauge output
over time, zero is used to eliminate this drift and
provide a true zero reading. For example, if an empty
scale were to display a value other than zero, the zero
function would tell the meter to show zero regardless
of the current input signal.
Capture Tare
The tare function also zeroes out the display. In the
case of scale weight, tare is used to eliminate
container weight and provide net weight readings. If
the tare value is a known constant, such as a
container weight, this may be programmed in
manually. The captured tare may be reset manually
with any function key or digital input.
Before Tare After capture tare After reset tare
Automatic Unit Conversion
In addition to entering a custom unit or tag,
pre-defined engineering units may be selected:
lb, kg, ounce, gram, ton (short), tonne (metric ton).
Automatic unit conversions are done when switching
between pre-defined units, without the need for
additional scaling. The meter converts the reading
according to the unit selected.
(e.g. 100.00 lb = 45.36 kg = 45359.2 g = 1600 oz).
Auto-Zero
The auto-zero feature corrects for drift that can occur
over time that causes the input signal to slowly
change. The meter will continue to read zero despite
slow and small changes to the input signal around
zero. The auto-zero sensitivity is set by the user as a
percent of full scale.
Shunt Calibration Check
The PD8-6100 is equipped with a means of simulating
strain in a strain gauge bridge circuit, via an included
shunt resistor in the meter. This technique can be
used as a means of verifying the meter setup and
output behavior by simulating a physical input. With
no load connected, the enabling of the shunt resistor
will simulate a 70% full scale load in the case of a
350 Ω Strain Bridge.
Ratiometric Compensation
This feature compensates for changes in the strain
gauge input signal that are due to variations in the
internal or external excitation voltage. The
compensation is effective for up to ±5% variation in
the excitation power supply.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
11
Advanced Display Features
Dual-Line Makes All the Difference
The main display can be programmed to indicate PV,
maximum (peak), minimum (valley), alternating
maximum/minimum, one of four alarm set points, or
Modbus®input. The second display can be configured
to display the input in a different scale, engineering
units, set points, user defined messages, or simply
turned off.
The ProtEX-MAX's dual-line display makes all the
difference both when programming the instrument
and when using it in the field. When programming the
instrument, the dual-line display prompts for the
needed information and also helps you keep track of
where you are in the setup process. When using the
instrument, the dual-line display provides more
information such as displaying the input in two
different scales like height and volume for a level
application. We call this the Dual-Scale feature.
Programming Assistance
The ProtEX-MAX's dual-line display makes
programming the instrument much easier because the
second display prompts for the needed information
and also helps you keep track of where you are in the
setup process.
The ProtEX-MAX is prompting for the value for Input 2
and displaying the default value of 100 mV. The “0” is
brighter than the rest of the digits indicating that it is
the number that will be changed by the Up arrow.
The ProtEX-MAX is now prompting for what the user
wants Display 2 to be; that is the value that
corresponds to 100 mV. In this case Display 2 is
currently set to 100.00.
Dual-Scale Display Feature
The ProtEX-MAX PD8-6100 has a rather unique, and
very flexible dual-scale capability; a second scaled
display can represent the measured input in a
different form (i.e. gallons & height). This is of
particular value in weight applications. Please see the
examples shown below.
Volume & Height Force & mV
Other Uses for Second Line
The second line can also be used indicate units, net
and gross, a tag, or even a setpoint as the following
pictures illustrate:
Weight & Units Net & Gross
mV & Setpoint Weight & Max (Peak)
Rounding for Steadier Display
The rounding feature is used to give the user a
steadier display with fluctuating signals. It causes the
display to round to the nearest value according to the
rounding value selected (1, 2, 5, 10, 20, 50, or 100).
For example, with a rounding value of 10, and an
input of 12346, the display would indicate 12350.
Super-Bright Display
The ProtEX-MAX comes standard with a super-bright
display, with LEDs that are visible even in direct
sunlight. The display also has up to eight levels of
adjustable intensity for optimum visibility in any
lighting condition.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
12
Physical Features
The ProtEX-MAX is designed for ease-of-use in safe
and hazardous applications. The ProtEX-MAX is
housed in a rugged NEMA 4X explosion-proof
enclosure, can operate over a wide temperature
range, includes removable screw terminal connectors,
has worldwide approvals for use in hazardous areas,
and features through-glass buttons for easy controller
operation without the need to remove the cover.
All of these features are backed by a 3-year warranty.
Super-Bright LED Display
The ProtEX-MAX features a dual-line 6-digit display
with super-bright LEDs, our brightest ever. These
allow the display to be read in any lighting condition,
even in direct sunlight.
SafeTouch Through-Glass Buttons
The ProtEX-MAX 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 DISABLE setting on the NO-CONTACT
BUTTONS switch located on the back of the
electronics module, inside the enclosure.
Rugged, Heavy-Duty Enclosure
The ProtEX-MAX is housed in a rugged NEMA 4X, 7,
& 9, IP68 die-cast aluminum enclosure, designed to
withstand harsh environments in safe and hazardous
areas over a wide temperature range.
Wide Viewing Angle
Customers can’t always look at the display from
straight on, so the window and display module have
been optimized to provide a wide viewing angle of
approximately ±40°; nearly twice that of the
competition.
Built-In Mounting Flanges
The ProtEX-MAX is equipped with four slotted flanges
for wall mounting or NPS 1½" to 2½" or DN 40 to
65 mm pipe mounting.
Flexible Mounting & Wiring
The ProtEX-MAX features four ¾" NPT threaded
conduit openings so that wiring can be routed to the
most convenient conduit connection(s). Two ¾" NPT
metal conduit plugs with 12 mm hex key fitting come
installed.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
13
Rotatable Display
The ProtEX-MAX rotatable display, along with four
available conduit connections, provide for numerous
installation options. The display can be rotated in 90°
increments. Rotate it 90° for horizontal mounting.
Vertical Mounting Horizontal Mounting
Perfect & Secure Fit Every Time
The internal cast rails ensure the ProtEX-MAX
assembles together perfectly, quickly and securely;
and everything lines up for optimal viewing every
time. There are no standoffs to worry about breaking
or getting out of alignment. Two spring-loaded,
self-retaining, thumbscrews make the assembly a
snap, while pressing the display as close to the
glass as possible to improve wide angle viewing.
Stainless Steel Tags
PDA-SSTAG is a laser etched stainless steel tag
accessory for any of your Precision Digital meters.
The tag features custom text for equipment
identification, instruction, or whatever else is needed
in your facility. Each tag comes with a stainless steel
wire and lead seal for easy mounting wherever you
need it.
Removable Screw Terminals
Industrial applications require screw terminal
connections for easy field wiring, and the
ProtEX-MAX goes one step further in convenience
by also making them removable.
Note: The above photograph is representative of the back of
the PD8-6100 in every regard except for the signal input
connector. See PROVUElectronics Module Layout for
PD8-6100-6H7 and PD8-6100-7H7 on page 23 for actual
input signal connections.
USB Port MeterView Pro
Hazardous Area Approvals
The ProtEX-MAX's approvals allow it to be used in
hazardous areas around the world. These include: FM
Approved as Explosion-Proof / Dust-Ignition-Proof /
Flame-Proof, CSA Certified as Explosion-Proof /
Dust-Ignition-Proof, and ATEX and IECEx Certified as
Flame-Proof.
Wide Operating Temperature Range
The ProtEX-MAX can operate from -40 to 60°C
(-40 to 140°F) meaning it can be installed in a wide
variety of indoor and outdoor industrial applications.
And over this range, the ProtEX-MAX will drift no
more than 0.005% of calibrated span/°C max from
0 to 65°C ambient and 0.01% of calibrated span/°C
max from -40 to 0°C ambient.
USB cable conveniently
plugs into side of
ProtEX-MAX meter

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
14
Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Display
Display Line 1: 0.60" (15 mm) high,
red LEDs
Display Line 2: 0.46" (12 mm) high,
red LEDs
6 digits each (-99999 to 999999),
with lead zero blanking
Display
Intensity
Eight user selectable intensity levels.
Default value is six.
Display
Update Rate
5/second (200 ms)
LED Status
Indicators
See LED Status Indicators on page 30 for
details.
Overrange
Display flashes 999999
Underrange
Display flashes -99999
Display
Assignment
Display Line 1:
PV1, PV2, PCT, max & min, set points, PV
& units, net & gross weight, Modbus input,
millivolts.
Display line 2:
Same as Display Line 1; plus units, tag or
turned off.
Units
Predefined: lb, kg, ounce, gram, ton, metric
ton (tonne); and custom units.
Programming
Methods
Four SafeTouch through-glass buttons
when cover is installed. Mechanical buttons
can be used with the cover removed. Free
PC-based USB MeterView Pro
programming software.
Noise Filter
Programmable from 2 to 199
(0 will disable filter)
Filter Bypass
Programmable from 0.1 to 99.9% of
calibrated span
Recalibration
All ranges are calibrated at the factory.
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 cycled.
Rounding
Select 1, 2, 5, 10, 20, 50, or 100
(e.g. rounding = 10, value = 123.45,
display = 123.50).
Tare
There are three modes of tare operation:
Capture Tare, Programmable Tare, and
Off. See Tare Functionality (tare) on page
48 for details.
Password
Three programmable passwords restrict
modification of programmed settings.
Pass 1: Allows use of function keys and
digital inputs
Pass 2: Allows use of function keys, digital
inputs and editing set/reset points
Pass 3: Restricts all programming, function
keys, and digital inputs.
Non-Volatile
Memory
All programmed settings are stored in
non-volatile memory for a minimum of ten
years if power is lost.
Power
Options
85-265VAC50/60Hz;90-265VDC,20Wmax;
12-24 VDC, 12-24 VAC, 15 W max.
Powered over USB for configuration only.
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 meters may
share one 5 A fuse
Normal Mode
Rejection
Greater than 60 dB at 50/60 Hz
Isolation
4 kV input-to-power line
500 V input-to-output
(powered by external supply)
Overvoltage
Category
Installation Overvoltage Category II:
Local level with smaller transient overvoltages
than Installation Overvoltage Category III.
Environmental
T6 Class operating temperature range
Ta = -40 to 60°C
T5 Class operating temperature range
Ta = -40 to 65°C
Storage temperature range:
-40 to 85°C (-40 to 185°F)
Relative humidity:
0 to 90% non-condensing
Max Power
Dissipation
Maximum power dissipation limited to 15.1 W
Connections
Power, signal, relays, mA out: Removable
screw terminal blocks accept 12 to 22 AWG
wire.
RS-485: Removable screw terminal block
accepts 16 to 30 AWG wire.
Digital I/O: Removable screw terminal
blocks accept 16 to 30 AWG wire.
Enclosure
Explosion-proof die-cast aluminum with
glass window, corrosion resistant epoxy
coating, color: blue
NEMA 4X, 7, & 9, IP68
Default conduit connections: Four ¾" NPT
threaded conduit openings and two ¾" NPT
metal conduit plugs with 12 mm hex key
fitting installed. Additional conduit opening
configurations may be available; verify
quantity and sizes on specific device
labeling during installation.
Mounting
Wall Mounting:
Four (4) mounting holes provided for
mounting meter to wall. See Wall Mounting
Instructions on page 19 for additional details.
Pipe Mounting:
Optional pipe mounting kit (PDA6848)
allows for pipe mounting. Sold separately.
See Pipe Mounting Instructions on page 20
for additional details.
Tightening
Torque
Power, signal, relays, mA out terminals:
5 lb-in (0.56 Nm)
Digital I/O and RS-485:
2.2 lb-in (0.25 Nm)
Overall
Dimensions
6.42" x 7.97" x 8.47" (W x H x D)
(163 mm x 202 mm x 215 mm)
Weight
16.0 lbs (7.26 kg)
Warranty
3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
15
Strain Gauge Input
Inputs
Field selectable: 0-15 mV, 0-30 mV,
0-150 mV, 0-300 mV, ±15 mV, ±25 mV,
±150 mV, ±250 mV, or Modbus PV (Slave)
Isolated
Sensor Power
Supply
Terminals EX+ & EX-: 10 VDC or
5 VDC 10%, rated @ 25 mA max.
Note: Do not use 24 VDC to power strain
gauge bridge.
Accuracy
±0.03% of calibrated span ±1 count
Minimum
Load
Resistance
14 Ω @ 5 V
28 Ω @ 10 V
Maximum
Excitation
Current
25 mA @ 5 V or 10 V
Temperature
Drift
0.002% of calibrated span/C max from
0 to 65C ambient, 0.005% of calibrated
span/C max from -30 to 0C ambient
Functions
Linear with multi-point linearization
Multi-Point
Linearization
2 to 32 points for PV or PV1
2 to 8 points for PV2 (Dual-scale feature)
Low
Cutoff
0.1 to 999,999 (0 disables cutoff function).
Point below at which display always shows
zero.
Decimal Point
Up to five decimal places or none:
d.ddddd, d.dddd, d.ddd, d.dd, d.d, or dddddd
Calibration
Range
Input
Range
Minimum Span
Input 1 & Input 2
15 mV
0.2 mV
25 mV, 30 mV
0.4 mV
150 mV
2.0 mV
250 mV, 300 mV
4.0 mV
An Error message will appear if the input 1
and input 2 signals are too close together.
Input
Impedance
Strain Gauge Bridge: Greater than 10 MΩ
mV Source: 200 kΩ
Relays
Rating
4 SPDT (Form C) internal and rated
3 A @ 30 VDC and 125/250 VAC resistive
load; 1/14 HP (≈50 W) @ 125/250 VAC for
inductive loads
Noise
Suppression
Noise suppression is recommended for
each relay contact switching inductive
loads; see Switching Inductive Loads on
page 27 for details.
Deadband
0-100% of span, user programmable
High or Low
Alarm
User may program any alarm for high or
low trip point.
Unused alarm LEDs and relays may be
disabled (turn off).
Relay
Operation
•Automatic (non-latching) and/or manual
reset
•Latching (requires manual
acknowledge) with or without clear
•Pump alternation control (2 to 4 relays)
•Sampling (based on time)
•Off (disable unused relays and enable
Interlock feature)
•Manual on/off control mode
Relay Reset
(Acknowledge)
User selectable via front panel button, F4
digital input, external contact closure on
digital inputs, or through serial
communications.
Time Delay
0 to 999.9 seconds, on & off relay time
delays. Programmable and independent for
each relay
Fail-Safe
Operation
Programmable and independent for each
relay.
Note: Relay coil is energized in non-alarm
condition. In case of power failure, relay will
go to alarm state.
Auto
Initialization
When power is applied to the meter, relays
will reflect the state of the input to the meter.
USB Connection
Function
Programming only
Compatibility
USB 2.0 Standard, Compliant
Connector
Type
Micro-B receptacle
Cable
USB A Male to Micro-B Cable
Driver
Microsoft®Windows®XP/Vista/7/8/10
Power
USB port provides power to the meter.
DO NOT apply AC or DC power to the
meter while the USB port is in use.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
16
Isolated 4-20 mA Transmitter
Output Option
Output
Source
Process variable (PV), max, min, set points
1-4, Modbus input, or manual control mode
Scaling
Range
1.000 to 23.000 mA for any display range
Calibration
Factory calibrated:
0.00 to 100.00 = 4-20 mA output
Analog
Output
Programming
1.000 mA minimum and 23.000 mA
maximum for all parameters: overrange,
underrange, max, min, and break
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/C max from 0 to 65C ambient,
0.8 µA/C max from -40 to 0C ambient
Note: Analog output drift is separate from
input drift.
Isolated
Transmitter
Power Supply
Terminals I+ & R: 24 VDC 10% isolated
from the input at >500 V. Used to power
the 4-20 mA output Refer to Figure 5.
PROVUElectronics Module Layout on page
23 and Figure 21. 4-20 mA Output
Connections on page 29.
All models rated @ 25 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply
Minimum
Maximum
24 VDC
10 
700 
35 VDC
(external)
100 
1200 
RS-485 Serial Communications
Compatibility
EIA-485
Connectors
Removable screw terminal connector
Max Distance
3,937' (1,200 m) max
Status
Indication
Separate LEDs for Power (METER LINK),
Transmit (TX), and Receive (RX)
Modbus®RTU Serial
Communications
Slave ID
1 –247 (Meter address)
Baud Rate
300 –19,200 bps
Transmit
Time Delay
Programmable between 0 and 199 ms
Data
8 bit (1 start bit, 1 or 2 stop bits)
Parity
Even, Odd, or None with 1 or 2 stop bits
Byte-to-Byte
Timeout
0.01 –2.54 second
Turn Around
Delay
Less than 2 ms (fixed)
Note: Refer to the ProtEX-MAX Modbus Register Tables
located at www.predig.com for details.
Digital Input (F4)
Function
Operate tare function, remote operation of
front-panel buttons, acknowledge/reset
relays, reset max/min values. See Function
Keys & Digital I/O Available Settings on
page 54 for a complete list of capabilities.
Contacts
3.3 VDC on contact. Connect normally
open contacts across F4 to COM
Logic Levels
Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC
MeterView Pro Software
Availability
Download directly from meter or from
www.predig.com/download_software
System
Requirements
Microsoft®Windows®XP/Vista/7/8/10
Communications
USB 2.0 (for programming only)
(USB A Male to Micro-B Cable)
RS-485 to USB converter
(programming, monitoring, and data
logging)
Configuration
Configure meters one at a time
Power
USB port provides power to the meter.
DO NOT apply AC or DC power to the
meter while the USB port is in use.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
17
Compliance Information
Electromagnetic Compatibility
Emissions
EN 55022
Class A ITE emissions requirements
Radiated
Emissions
Class A
AC Mains
Conducted
Emissions
Class A
Immunity
EN 61326-1
Measurement, control, and laboratory
equipment
EN 61000-6-2
EMC heavy industrial generic
immunity standard
RFI - Amplitude
Modulated
80 -1000 MHz 10 V/m 80% AM (1 kHz)
1.4 - 2.0 GHz 3 V/m 80% AM (1 kHz)
2.0 - 2.7 GHz 1 V/m 80% AM (1 kHz)
Electrical Fast
Transients
±2kV AC mains, ±1kV other
Electrostatic
Discharge
±4kV contact, ±8kV air
RFI -
Conducted
10V, 0.15-80 MHz, 1kHz 80% AM
AC Surge
±2kV Common, ±1kV Differential
Surge
1KV (CM)
Power-
Frequency
Magnetic Field
30 A/m 70%V for 0.5 period
Voltage Dips
40%V for 5 & 50 periods
70%V for 25 periods
Voltage
Interruptions
<5%V for 250 periods
Note: Testing was conducted on meters with cable shields
grounded at the point of entry representing installations
designed to optimize EMC performance.
Product Ratings and Approvals
FM
Enclosure: Type 4X; IP66
Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1, T5/T6
Class I, Zone 1, AEx d, IIC Gb T5/T6
Zone 21, AEx tb IIIC T90°C; Ta = -40°C to +65°C
T6 Ta = -40°C to +60°C; T5 Ta = -40°C to +65°C
Certificate Number: 3047283
CSA
Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1
Class I Zone 1 Ex d IIC
Zone 21 Ex tb IIIC T90°C
-40°C < Tamb. < +60° C; Temperature Code T6
-40°C < Tamb. < +65° C; Temperature Code T5
Enclosure Type 4X & IP68
Certificate Number: 2531731
ATEX
II 2 G D
Ex d IIC T* Gb
Ex tb IIIC T90°C Db IP68
Ta = -40°C to +*°C
*T6 = -40°C to +60°C
*T5 = -40°C to +65°C
Certificate number: Sira 12ATEX1182
IECEx
Ex d IIC T* Gb
Ex tb IIIC T90°C Db IP68
Ta = -40°C to +*°C
*T6 = -40°C to +60°C
*T5 = -40°C to +65°C
Certificate Number: IECEx SIR 12.0073
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. Cable must be suitable for 90°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 European Community: The ProtEX-MAX must
be installed in accordance with the ATEX directive
94/9/EC, and the product certificate Sira
12ATEX1182.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
18
EU Declaration of
Conformity
EU Declaration of Conformity is available in the
Documentation CD provided with the product under
the EU DoC menu.
Safety Information
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•Hazardous voltages exist within enclosure.
Installation and service should be performed only
by trained service personnel.
Installation
Install in accordance with applicable local and
national regulations (e.g. NEC).
For Installation in USA
The ProtEX-MAX must be installed in accordance
with the National Electrical Code (NEC) NFPA
70.
For Installation in Canada
The ProtEX-MAX must be installed in accordance
with the Canadian Electrical Code CSA 22.1. All
power supplies below 36 V and input circuits
must be derived from a CSA Approved Class 2
source.
For European Community
The ProtEX-MAX must be installed in accordance
with the ATEX directive 94/9/EC and the product
certificate Sira 12ATEX1182.
•Disconnect from supply before opening
enclosure.
•Keep cover tight while circuits are live.
•Conduit seals must be installed within 18"
(450mm) of the enclosure or within 2" (50mm)
for Zone installations.
Wiring connectors are accessed by opening the
enclosure. To access electrical connectors,
remove the 2 captive screws and then remove
the electronics module. Connectors are on the
rear of the electronics module.
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 Plugs
The ProtEX-MAX is supplied with two pre-installed
conduit plugs for installations that do not require the
use of all four conduit entries. The conduit/stopping
plugs include an internal hexagonal socket recess for
removal. The conduit plugs and their factory
installation are included in all hazardous area
approvals of this product.
•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.
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
hazardous 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, screw
head, and wrench.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
19
Mounting
The ProtEX-MAX has four slotted mounting flanges
that may be used for pipe mounting or wall mounting.
Refer to Figure 1 and Figure 2 below.
•Do not attempt to loosen or remove flange bolts
while the meter is in service.
Mounting Dimensions
All units: inches (mm)
Figure 1. Enclosure Dimensions –Front View
Figure 2. Enclosure Dimensions –
Side Cross Section View
Wall Mounting Instructions
The meter can be mounted to any wall or flat surface
using the four provided mounting holes located in the
cast-in flanges. In addition, the internal electronic
assembly can be rotated to allow the enclosure to be
mounted in any position. To mount the meter to a
wall, follow these instructions:
•Prepare a section of wall approximately
7" x 8.5" (178 mm x 216 mm) for meter
mounting by marking with a pencil the
mounting holes (shown in Figure 1) on the
wall.
•Select the appropriate mounting screws for the
mounting surface to be used. The mounting
holes diameter is shown on Figure 1.
Note: Mounting screws are not included.
•Using a drill bit slightly smaller than the girth
of the mounting screws, pre-drill holes at the
mounting locations previously marked.
•Insert mounting screws into the four mounting
holes and screw them into the pre-drilled
holes.

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
20
Pipe Mounting Instructions
The meter can also be mounted to a pipe using an
optional U-Bolt kit. This kit includes two U-bolts, the
necessary hardware, and is available in zinc plated
steel (PDA6848) and 316 stainless steel
(PDA6848-SS).
To mount the meter using a U-Bolt kit, follow these
instructions:
•Orient the groove on the back of the
instrument with the pipe and secure it to the
pipe with the two U-bolts and hardware
provided.
Vertical Pipe Mounting
Horizontal Pipe Mounting