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PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
• Explosion-Proof Process & Temperature Meter
• 4-20 mA, ± 10 V, TC & RTD Field Selectable Inputs
• Full 4-Digit Display, 1.20" (30.5 mm)
• SafeTouch Through-Glass Button Programming
• Display Mountable at 0°, 90°, 180°, & 270°
• Isolated 24 VDC @ 200 mA Transmitter Power Supply Option (AC powered meters only)
• 2 Relays + Isolated 4-20 mA Output Option
• Free PC-Based MeterView Programming & Monitoring Software
• Sunlight Readable Display
• Operating Temperature Range: -40 to 65°C (-40 to 149°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 12-36 VDC / 12-24 VAC
• Duplex Pump Controller with Alternation Capability
• External Contacts for Remote Button Operation
• On-Board RS-485 Serial Communications
• Modbus® RTU Communication Protocol Standard
• Copy Meter Settings to Other PD8-765 Meters
• Password Protection
• Max/Min Display
• High & Low Alarms with Multiple Reset Actions
• Flanges for Wall or Pipe Mounting
• Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum Enclosure
• Four 3/4" NPT Threaded Conduit Openings (Two Plugs Installed)
• Pipe Mounting Kits
• Stainless Steel Tag Available
• 3-Year Warranty
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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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
Programming Software
Note: PD8-765 meter is not powered from USB connection
and requires external power to be programmed.
The PD8-765 is easily setup and programmed without
removing the cover by using the four through-glass
SafeTouch buttons or by removing the cover and
using the front panel push buttons. The meter can
also be programmed using a PC and Precision
Digital’s free MeterView software or “cloned” with the
Copy function. Programming the PD8-765 with
MeterView software requires removing the front cover
and connecting to the electronics module to the PC
via the PDA8006 Trident USB serial adapter.
MeterView programming software is intuitive, and
most customers can get their meter programmed as
they like without even looking in the manual.
Watch MeterView Software Video at
http://www.predig.com/meterview
In addition to programming, the software, with the use
of additional devices, 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 buttons and the instructions in this
manual to do so.
• The meter should only be connected to a
computer while it is located in a safe area.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Table of Contents
Introduction ......................................................................................................... 7
Ordering Information .......................................................................................... 7
Helpful Videos ..................................................................................................... 8
Key Features ....................................................................................................... 9
Useful Tools ...................................................................................................... 15
Specifications ................................................................................................... 16
General .......................................................................................................... 16
Process Inputs .............................................................................................. 17
Temperature Inputs ...................................................................................... 17
Relays Option ................................................................................................ 18
External Button Contacts ................................ ................................ ............. 18
Isolated 4-20 mA Transmitter Output Option ............................................. 18
RS-485 Serial Communications ................................................................... 18
Modbus® RTU Serial Communications ....................................................... 18
Compliance Information................................................................................... 19
Electromagnetic Compatibility .................................................................... 19
EU Declaration of Conformity .......................................................................... 20
Safety Information ............................................................................................ 20
Product Ratings and Approvals .................................................................. 19
Installation......................................................................................................... 20
Unpacking ..................................................................................................... 20
Mounting ........................................................................................................ 21
MeterView Software ...................................................................................... 23
Connections .................................................................................................. 29
Required & Factory Wired Connection ........................................................ 29
PD765 Trident Electronics Module Layout ................................................. 30
Connector Labeling ..................................................................................... 30
Power Connections ..................................................................................... 31
Signal Connections ..................................................................................... 31
Relays and 24 V Output Connections ......................................................... 32
Switching Inductive Loads ........................................................................... 32
RS-485 Connections ................................................................................... 33
RS-485 Multi-Drop Connection .................................................................... 33
4-20 mA Output & Input Signal Connections ............................................... 34
External Button Contacts ................................ ................................ ............. 34
Setup and Programming .................................................................................. 35
Overview ........................................................................................................ 35
LED Status Indicators ................................................................................... 35
Programming Buttons .................................................................................. 36
SafeTouch Buttons ....................................................................................... 36
Display Functions and Messages ............................................................... 37
Main Menu ..................................................................................................... 38
Setting Numeric Values ................................................................................ 38
Setting Up the Meter (setu) .......................................................................... 38
Setting the Input Signal (inpt) ..................................................................... 38
Setting the Decimal Point (dc.pt) ................................................................. 39
Setting the Temperature Scale (F C) ......................................................... 39
Programming the Meter (prog) ..................................................................... 39
Scaling the Meter (scal) .............................................................................. 39
Calibrating the Meter (Cal) .......................................................................... 40
Recalibrating Temperature Inputs (Cal) ...................................................... 40
Recalibrating Process Inputs (ICal) ............................................................ 40
Setting the Relay Operation (rely) .............................................................. 41
Acknowledging Relays ................................................................................ 41
Relay and Alarm Operation ......................................................................... 42
Scaling the 4-20 mA Analog Output (Aout).................................................. 46
Program the Sensor Break Output Value (SEbr) ........................................ 46
Analog Output when Display is Out of Range ............................................ 46
Setting Up the Password (pass) ................................................................ ... 47
Locking the Meter ........................................................................................ 47
Unlocking the Meter .................................................................................... 47
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Advanced Features Menu ............................................................................ 47
Advanced Features Menu & Display Messages .......................................... 47
Offset Adjustment (Adj) ............................................................................... 48
Noise Filter (fltr) ....................................................................................... 48
Noise Filter Bypass (byps) ........................................................................... 48
Serial Communications (serl) ..................................................................... 49
Protocol Selection Menu (Prot) ................................................................... 49
Select Menu (SElc) ...................................................................................... 49
Linear or Square Root Function (linr or Sqrt) ........................................... 49
Low-Flow Cutoff (cutF) ................................................................................ 49
Display Intensity (inty) ............................................................................... 50
Meter Copy Function (Copy) ........................................................................ 50
Internal Calibration (ICal)............................................................................ 51
Meter Operation ................................................................................................ 52
Buttons Operation ........................................................................................ 52
Maximum/Minimum Readings ..................................................................... 52
Remote Operation of Meter Buttons ........................................................... 52
Troubleshooting ............................................................................................... 53
Diagnostics Menu (diag) .............................................................................. 53
Determining Software Version ..................................................................... 53
Reset Meter to Factory Defaults .................................................................. 53
Factory Defaults & User Settings ................................................................ 54
Troubleshooting Tips ................................................................................... 55
Quick Interface Reference Guide .................................................................... 57
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Table of Figures
Figure 1. Enclosure Dimensions – Front View ................................................... 21
Figure 2. Enclosure Dimensions – Side Cross Section View ........................... 21
Figure 3: Integrated PD765 Trident Required Connections .............................. 29
Figure 4. PD765 Trident Electronics Module Layout ......................................... 30
Figure 5. Connector Labeling for PD8-765-6X0-10 ............................................ 30
Figure 6. Connector Labeling for PD8-765-6X3-20 ............................................ 30
Figure 7. Connector Labeling for PD8-765-7X0-00 ............................................ 30
Figure 8. Connector Labeling for PD8-765-7X5-00 ............................................ 30
Figure 9. Power Connections .............................................................................. 31
Figure 10. Transmitter Powered by Internal Supply .......................................... 31
Figure 11. Transmitter Powered by External Supply or Self-Powered ............. 31
Figure 12. Voltage Input Connections ................................................................ 31
Figure 13. Thermocouple Input Connections ..................................................... 31
Figure 14. Three-Wire RTD Input Connections .................................................. 31
Figure 15. Two-Wire RTD Input Connections ..................................................... 32
Figure 16. Four-Wire RTD Input Connections .................................................... 32
Figure 17. Relay & 24 V Output Connections ..................................................... 32
Figure 18. AC and DC Loads Protection ............................................................. 32
Figure 19. Low Voltage DC Loads Protection .................................................... 32
Figure 20. RS-485 Connections ........................................................................... 33
Figure 21. Three-Wire RS-485 Connections ....................................................... 33
Figure 22. 4-20 mA Output & Input Signal Powered by PD8-765-6X3-20 ........ 34
Figure 23. 4-20 mA Output Signal Powered by PD8-765-6X5-10 ..................... 34
Figure 24. 4-20 mA Output Powered Externally ................................................. 34
Figure 25. PD8-765-6X5-10 Powers Both the Heater Input Signal .................... 34
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Introduction
The ProtEX-MAX PD8-765 explosion-proof,
large-display, process and temperature meter offers
all the functionality of the PD765 Trident as a fully FM,
CSA, ATEX, and IECEx approved explosion-proof
product. PD8-765's huge 1.2" (30.5 mm) sunlight
readable display is visible from over 30 feet away.
This explosion-proof indicator can be field
programmed to accept process voltage (0-5 V, 1-5 V,
etc.) and current (4-20 mA) inputs, 100 Ohm RTDs,
and the four most common thermocouples.
The intensity of the display can be adjusted to
compensate for various lighting conditions, including
direct sunlight. The meter can be programmed and
operated without opening the housing by using the
built-in SafeTouch through-glass buttons or the
RS-485 serial communication port with free Modbus®
protocol. Options for the PD8-765 process and
temperature indicator include 2 relays, a 4-20 mA
output, and a 24 V transmitter power supply.
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
Options Installed
PD8-765-6X0-10
24 VDC Transmitter Supply
PD8-765-6X3-20
4-20 mA Out
Dual 24 VDC Transmitter Supplies
PD8-765-6X5-10
2 Relays
4-20 mA Output
24 VDC Transmitter Supply
12-36 VDC Models
Model
Options Installed
PD8-765-7X0-00
No options
PD8-765-7X5-00
2 relays
4-20 mA output
Accessories
Model
Description
PDA7420
PD8-765 Copy Cable, 7' (2.1 m)
PDA8006*
USB Serial Adapter for Programming
Meter with MeterView Software
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
*See Free 8006 to receive PDA8006 at no charge.
Notes:
1. 24 VDC transmitter supply available only on
AC powered meters.
2. RS-485 Communications is standard on all
products
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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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 PD8-765 meters
have the same general features and functionality of
the PD765 Trident meters, appropriate videos for the
PD765 Trident meter are also included.
ProtEX-MAX Products Overview
Learn about the complete line of ProtEX-MAX products.
predig.com/videos/ProtEXMAX_Overview
Programming a Thermocouple Input
This video details how to program a thermocouple
input on a PD765 Trident Series meter.
predig.com/Program_Trident_Thermocouple
PD765 Trident Display Advantages
The PD765 Trident digital panel meter's 1.2" LED
display makes it the ideal choice when upgrading your
panels. Watch this video and see real examples of the
PD765 Trident improving existing panels with its huge
display!
predig.com/videos/Trident_X2_Display_Advantages
PD765 Trident Demonstration
Watch this live demonstration of the PD765 Trident
digital panel meter and see how it can improve your
process. This video will show you the advantage of
the large 1.2" display and simulate a level application.
predig.com/videos/Trident_X2_Live_Demo
MeterView Serial Communications
The PD765 Trident series is one of Precision Digital's
most trusted and proven meters ever, and it now has
new serial communications capabilities to make it
easier to use than ever before. Watch this short video
for more information.
predig.com/MV_Serial_Comm_PDA8006
Use ProtEX-MAX for Pump Control
Learn how to use the PD765 Trident (ProtEX-MAX)
meter as an explosion-proof pump controller. See
how two relays can be used to control two pumps with
alternation capability.
predig.com/videos/Pump_Controller_Key_Features
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Key Features
The Only Explosion-Proof Process & Temperature Meter You Will Ever Need
The PD8-765 ProtEX-MAX is an explosion-proof
version of the popular PD765 Trident process and
temperature meter. It can satisfy a wide variety of
process applications. The PD8-765 can be field
programmed to accept process voltage (0-5V, 1-5V,
etc.) and current (4-20 mA) inputs, 100 Ohm RTDs,
and the four most common thermocouples. It is
housed in an IP68 NEMA 4X rated explosion-proof
die cast aluminum enclosure and is a fully approved
product carrying FM, CSA, ATEX, and IECEx
approvals.
There are two power options for the ProtEX-MAX:
85 to 265 VAC or 12-36 VDC and the AC powered
versions can provide 24 VDC to power the transmitter
if needed. Programming and setup can be performed
with the four SafeTouch through-glass buttons, free
MeterView software, or using the Copy function.
The relays and isolated 4-20 mA output option
increases the utility of the PD8-765. The relays can be
used for alarm or control applications. The 4-20 mA
output provides an isolated retransmission of the input
signal; especially useful for temperature inputs like
thermocouples and RTDs. Now you can have an
explosion-proof temperature transmitter with a huge,
bright display!
The PD8-765 ProtEX-MAX display height is an
astounding 1.2" (30.5 mm). It can be read easily from
distances of up to 30 feet away! The display intensity
function allows the selection of eight levels of intensity
for various lighting conditions, including direct
sunlight.
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Easy Programming Methods
The PD8-765 is easily setup and programmed without
removing the cover by using the four through-glass
SafeTouch buttons or by removing the cover and
using the front panel push buttons. The meter can
also be programmed using a PC and Precision
Digital’s free MeterView software or “cloned” with the
Copy function. Programming the PD8-765 with
MeterView software requires removing the front cover
and connecting to the electronics module to the PC
via the PDA8006 Trident USB serial adapter.
MeterView software allows all PD8-765 setup
parameters to be programmed from a PC and to save
the configuration settings to a file for reporting or
programming other meters. For programming
purposes, MeterView software connects to the
PD8-765 meter via the low-cost PDA8006 USB serial
adapter pictured above. We will even send you a
PDA8006 USB adapter, normally sold for $43.00, at
no cost if you register your meter at
http://www.predig.com/free8006 (limit one per
customer). You can program the PD8-765 you just
bought with the front panel buttons and have the
PDA8006 on hand for programming future meters.
Advanced Display Features
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.
Four Full Digits
The display on the PD8-765 is four full digits which
means it can display numbers up to 9999. Many digital
devices have displays of only 3½ digits which means
they can display only to 1999. In practical terms, this
means the PD8-765 can display type K thermocouples
to 2300ºF and 4-20 mA signals up to 9,999.
Front Panel LEDs
The meter is supplied with two alarm points that
include front panel LEDs to indicate alarm conditions.
This standard feature is particularly useful for alarm
applications that require visual-only indication.
Large Display Size
The display height on the ProtEX-MAX PD8-765 is an
astounding 1.2" (30.5 mm). It can be easily read from
distances of up to 30 feet!
Meter Copy
The Copy function is used to copy (or clone) all the
settings from one PD8-765 meter to other PD8-765
meters in less than 10 seconds. The Copy feature
does not require a serial communication adapter, it
only requires the optional cable assembly (PDA7420).
Note: The PD8-765 modules must be removed from the enclosures
to connect the copy cable.
Display & Toggle Max / Min Reading
The main function of the front panel buttons during
operation is to display the maximum and minimum
readings reached by the process or temperature
inputs. The PD8-765 allows you to toggle between the
maximum and minimum readings of the process
values. To display the maximum and minimum
readings since the last reset/power-up, use the
Up arrow/Max button.
Display & Toggle Maximum Value
Display & Toggle Minimum Value
ProtEX-MAX PD8-765
Actual Size Digit
1.2"
(30.5 mm)
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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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 meter
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 4-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.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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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 terminals on the External Contacts connector
are wired to the connector on the electronics module
to enable the SafeTouch buttons so the meter can be
programmed without removing the cover.
Program Meter from USB Port
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.
Use the PDA8006 Trident
USB Serial Adapter for
Programming with MeterView
Easy Plug-in Removable
Terminal Connectors
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Transmitter Power Supplies
Meter Powers Transmitter
One of the most useful features of AC powered
PD8-765s is their built-in, isolated, 24 V @ 200 mA
power supply to power the transmitter. This feature
saves money by eliminating an external power supply
and also simplifies wiring.
The following diagrams illustrate how to wire an AC
powered PD8-765 so it will power the transmitter:
Connections for PD8-765-6X0-10 & PD8-765-6X5-10
Meter Powers 4-20 mA Output
Not only can the AC powered PD8-765 power the
4-20 mA input signal, but an additional power supply
of 24 V @ 40 mA is available to power the 4-20 mA
output.
Connections for PD8-765-6X3-20
Isolated Transmitter Output
The PD8-765's isolated 4-20 mA output option
converts the meter into a transmitter / loop isolator
with a digital display; perfect for temperature
applications!
Fuse Prevents Current Overload
Another very useful aspect of the PD8-765 is that the
current input is protected against current overload by
a resettable fuse. The fuse limits the current to a safe
level when it detects a fault condition, and
automatically resets itself when the fault condition is
removed.
Other Uses for Power Supplies
The most common use for these two power supplies
is for the 200 mA transmitter power supply to power
the field transmitter and 40 mA power supply to power
the 4-20 mA output from the meter. However, these
two power supplies can be used in other ways. For
instance, some level transmitters require the use of a
heated lens. The PD8-765’s 200 mA power supply
could be used to power both the heated lens and the
4-20 mA signal from the transmitter.
PD8-765-6X5-10 Powers Both the Heater
and 4-20 mA Input Signal
External Power Supply for Loop
For applications that require an external transmitter
power supply, the same PD8-765 is used and merely
wired in a different fashion as the following diagrams
illustrate:
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Exp-Proof Temperature
Transmitter with Big Display
The PD8-765, with an optional 4-20 mA output, can
be used as an isolated temperature transmitter with a
big display by converting the thermocouple or RTD
input into an isolated 4-20 mA output.
Input Signal Conditioning
To satisfy applications that require scaling in ways
other than the usual 2-point linear method, the
ProtEX-MAX can also be scaled for square root
(DP flow).
Square Root Linearization
The square root function can be used to linearize the
signal from a differential pressure transmitter and
display flow rate in engineering units.
Exp-Proof Dual-Pump Alternation
The ProtEX-MAX can be used as an explosion-proof
pump controller when combined with a continuous
level transmitter. The most common pump control
application is shown below: controlling and alternating
two pumps. In addition, the ProtEX-MAX provides the
24 V to power the transmitter.
Relay #1 turns the main pump on at 6000 gallons and
turns it off at 1000 gallons.
With the Pump Alternation feature activated, the next
time the level reaches 6000 gallons, relay #2 starts
the backup pump.
If the active pump is not able to keep up, and the level
reaches 7000 gallons, the other relay will start the
inactive pump as well.
When the level falls below 1000 gallons, both pumps
will turn off.
Learn how to use the PD765 Trident
(ProtEX-MAX) meter as an explosion-proof
pump controller. See how the four relays
can be used to alternate two pumps and
provide high and low alarms.
predig.com/videos/PumpControl
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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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
ranges. 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.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Display
1.20" (31 mm), red LED,
Four digits (-1999 to 9999),
automatic lead zero blanking.
Display
Intensity
Eight user selectable intensity levels.
Default intensity is six.
Display
Update Rate
Process/RTD: 3.7-5/second
Thermocouple: 1.8-2.5/second
LED Status
Indicators
See LED Status Indicators on page 35
for details.
Overrange
Display flashes 9999
Underrange
Display flashes -1999
Programming
Methods
Four SafeTouch through-glass buttons
when cover is installed. Mechanical
buttons can be used with the cover
removed. Cloning with Copy feature.
Free PC-based USB MeterView
programming software, and Modbus®
registers.
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 turned off.
Password
Restricts modification of programmed
settings
Non-Volatile
Memory
All programmed settings are stored in
non-volatile memory for a minimum of ten
years if power is lost.
Power
Options
85-265 VAC, 50/60 Hz; 90-265 VDC, 20 W max
or 12-36 VDC; 12-24 VAC, 6 W max
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 meters may
share one 5 A fuse
Normal Mode
Rejection
64 dB at 50/60 Hz
Isolation
4 kV input/output-to-power line
500 V input-to-output
or output-to-P+ supply
6X5 models only:
100 V output-to-24 VDC 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
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
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 21 for
additional details.
Pipe Mounting:
Optional pipe mounting kit (PDA6848)
allows for pipe mounting. Sold separately.
See Pipe Mounting Instructions on page
22 for additional details.
Tightening
Torque
Screw terminal connectors:
5 lb-in (0.56 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.
Page 17
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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17
Process Inputs
Inputs
0-20 mA, 4-20 mA, 1-5 V, ±10 V
Transmitter
Supply
Isolated, one or two transmitter
supplies P1: 24 VDC ±10% @ 200 mA
max (-10 option) P1 & P2: 24 VDC
±10% @ 200 mA & 40 mA max
(-20 option)
Accuracy
±0.05% FS ±1 count;
±0.1% FS ±2 counts for square root
Function
Linear or square root
Low-Flow
Cutoff
0 to 9999 (0 disables cutoff function)
Point below at which display always
shows zero
Decimal Point
Up to 3 decimals
Calibration
Scale without signal or calibrate with
signal source
Calibration
Range
User programmable over entire range
of meter
Input
Impedance
Voltage range: greater than 1 MΩ,
Current range: 50-100 Ω, varies with
resettable fuse impedance
Input
Overload
Protected by automatically resettable
fuse
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.
Temperature Drift
0 to 65C
ambient
-40 to 0C
ambient
Current: ±0.20% FS
(50 PPM/C)
Voltage: ±0.02% FS
(1.7 PPM/C)
Current:
±0.80% FS
Voltage:
±0.06% FS
Temperature Inputs
Inputs
Factory calibrated, field selectable:
type J, K, T, or E thermocouples and
100 Ω platinum RTD (0.00385 or
0.00392 curve)
Resolution
1°; type T TC & RTD: 1° or 0.1°
Cold Junction
Reference
Automatic
Temperature Drift
±2°C maximum
Offset
Adjustment
Programmable to ±19.9°. This
parameter allows the user to apply an
offset value to the temperature being
displayed.
Input
Impedance
Greater than 100 k
Accuracy
Input Type
Range
Accuracy
(0 - 65 C)
Accuracy
(-40 - 0 C)
Resolution
J
-58 to 1382F
-50 to 750C
±2°F
±1°C
±5°F
±3°C
1°
K
-58 to 2300F
-50 to 1260C
±2°F
±1°C
±4°F
±2°C
1°
T
-292 to 700F
-180 to 371C
±2°F
±1°C
±13°F
±7°C
1° or 0.1°
E
-58 to 1700ºF
-50 to 927ºC
±2°F
±1°C
±11°F
±6°C
1°
RTD
-328 to 1382F
-200 to 750C
±1°F
±1°C
±5°F
±3°C
1° or 0.1°
Page 18
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
18
Relays Option
Rating
2 Form C (SPDT); rated 3 A @ 30 VDC
or 3 A @ 250 VAC resistive load;
1/14 HP (≈ 50 watts) @ 125/250 VAC
for inductive loads such as contactors,
solenoids, etc.
Deadband
0-100% FS, user selectable
Electrical Noise
Suppression
A snubber should be connected to
each relay contact switching inductive
loads to prevent disruption to the
microprocessor’s operation.
Recommended snubber value:
0.01 µF/470 , 250 VAC (PDX6901).
High or Low
Alarm
User may program any alarm for high
or low
Relay
Operation
• Automatic (non-latching) and/or
manual reset
• Latching (requires manual
acknowledge) with/without clear
• Pump alternation control
• Off (disable unused relays)
Relay Reset
Front panel button, terminal at back of
meter or through serial communications
Time Delay
0 to 199 seconds, on and off delays;
programmable
Sensor Break
Relay Operation
The sensor break relay condition may
be programmed for each relay as
On (alarm) or Off (non-alarm).
The relays will enter these states when
a sensor break is detected for RTD or
thermocouple inputs. These settings
have no effect when current or voltage
inputs are selected.
Fail-Safe
Operation
Programmable, independent for each
relay. Relay coils are energized in
non-alarm condition. In case of power
failure, relays 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.
External Button Contacts
Number
Four
Function
Remote operation of front-panel
buttons: programming, reset relays or
view/reset max/min readings
Open State
+5 VDC open contact on button input
terminals
Closed State
Closed contact button input terminal to
common/ground, active low 0 to 0.4 VDC
Isolated 4-20 mA Transmitter Output Option
Scaling Range
1.00 to 23.00 mA;
reverse scaling allowed
Calibration
Factory calibrated for 4-20 mA
Accuracy
±0.1% FS ±0.004 mA
Temperature Drift
50 PPM/°C
Note: Analog output drift is separate from
input drift.
Isolation
500 V input-to-output or output-to-24
VDC supplies
4 kV output-to-power line
For -6X5 models only:
100 V output-to-24 VDC supply
External Power
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 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 stop bit)
Parity
None (1 or 2 stop bits), even, or odd
(Modbus® only; PDC protocol does not
use parity)
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.
Page 19
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
19
Compliance Information
Electromagnetic Compatibility
Emissions
EN 55011
Group 1 Class A ISM 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)
PowerFrequency
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
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 & IP66
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.
Page 20
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
20
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 and/or
wrench.
Page 21
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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21
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.
Page 22
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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22
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
Page 23
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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23
MeterView Software
The easiest and quickest way to program your PD8765 is to use the FREE MeterView software. We will
even send you a PDA8006 USB adapter, normally
sold for $43.00, at no cost if you register your meter at
http://www.predig.com/free8006 (limit one per
customer). You can program the PD8-765 you just
bought with the front panel buttons and have the
PDA8006 on hand for programming future meters.
Remote Programming
MeterView software allows all setup parameters to be
programmed remotely from a PC and saved to a file
for reporting or programming other meters.
Data Acquisition
MeterView software provides a convenient way to
collect the data generated by the PD8-765 serial
output. The user can select the logging time interval.
Data can be written to a file, which can then be
imported into a spreadsheet or other application.
Monitoring
MeterView software can be used to monitor up to 100
PD8-765s on a PC. The user can set a custom meter
identification, such as Tank 1 to display on the screen
as well as engineering units, such as feet. The screen
shot below shows MeterView software monitoring
level in six storage tanks:
Monitoring System Parts
The following table illustrates the parts needed to
monitor 10 PD8-765s:
Quantity
Model
Description
10
PDA7422
Trident RS-485
Serial Adapter
1
PDA8485-I
USB to RS-485
Isolated Converter
MeterView Installation
1. Go to www.predig.com/meterview
2. Read instructions & copy serial # of desired
MeterView version
3. Download Installation file to computer
4. Double-click installation file to open it
5. Double-click Setup.exe to begin installation
6. Follow on-screen instructions
Running MeterView the First Time
The first time MeterView is run it is necessary to set
up the serial communication settings of the program.
Select the communication port and the baud rate of
the meter(s) connected.
Note: The selected baud rate in MeterView and the meter(s) baud
rate must be the same. Otherwise a communication error will
occur.
• Only one meter may be connected at a time.
Attaching multiple meters will cause a conflict
with the meter software.
• The meter should only be connected to a
computer while it is located in a safe area.
• DO NOT unplug the meter while the new
installation files are being written to it. The meter
will display uwrite during the process and you
will receive an on-screen notification once the
process is complete.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Enable Meter and Select Meter Address
The actual meter address is set up at the meter using
the front panel buttons. The location where a meter is
displayed is selected on MeterView Main window.
To enable or select a meter with a different serial address:
1. Right-click on the screen location of meter.
2. Click on Enabled, if meter is not yet enabled.
3. Click on Change Address.
4. Select meter address to display in this location.
MeterView Main Window
The main MeterView window shows the present
reading(s), relays/alarm status, tag number(s)
and selected engineering units, along with other
information for each meter. The graphic below indicates
the different parts of the main MeterView window.
Main Window Menus
The MeterView main window contains the following
menus:
• File menu
• Edit menu
• View menu
• Comm Menu
• Help Menu
File Menu
The following options are available from this menu:
1. Exit to close the MeterView program.
Edit Menu
The following options are available from this menu:
1. Serial Settings to edit the serial
communication settings.
2. Number of Meters to automatically populate
the Main Window with a single meter, 10
meters, or 100 meters.
View Menu
The following options are available from this menu:
1. Event Log to view the MeterView event log
window where all internal program events and
errors are logged.
2. Show Relay Alerts select whether or not
MeterView should alert the user of a change
in the relay status (ON → OFF or vice versa)
with a pop-up message.
Comm Menu
The following options are available from this menu:
1. Stop to halt the automatic meter scanning.
This allows quicker access to menu items,
functions, and windows.
2. Start to resume the automatic meter
scanning.
Help Menu
The following options are available from this menu:
1. Online Resources links to Predig.com for
help and product documentation.
2. About Meterview 3.3 for version number and
build information.
Address being
scanned
Logging
System date
COM port used
Update/scan
System time
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Right Click Menu
By right clicking on a meter on the screen a menu will
appear with the following options:
Menu Item
Function/Submenus
Enabled
Enable or disable a meter on the
screen
Change Address
Change a meter’s serial address in
MeterView
Mode
Show relays
Configure
Access the configuration window for a
meter
Customize
Customize how a meter looks on the
screen
Notes:
• Accessing menus or other windows could disrupt communication
with the meter(s).
• Use left mouse button or tab key on the keyboard to navigate
within a window.
• Parameters not available within a window appear grayed-out.
• An arrow next to a box indicates a drop-down menu. Click on
arrow to display the drop-down menu.
Configuration Window
Click on Configure in the right click menu to open a
meter’s configuration window. The following settings
can be programmed from this window:
1. Input type (4-20 mA, 0-10 V, RTD, or TC).
2. Decimal point for process inputs (dd.dd).
3. Units (F or C) and sensor type for
temperature inputs.
4. Values for scaling process inputs, values for
scaling analog output, Password, Adjust
(temperature only), Filter, Bypass, Cutoff
(process inputs only), Transmit Delay,
Function type, and Cut-off.
5. Relay settings.
6. After the last change has been made, click
the Write to Meter button or press Enter on
the keyboard to send the new settings to the
meter, or click on Exit to abandon changes.
Before sending the new settings, MeterView
will ask to confirm that the meter’s current
settings should be overwritten. Click Yes to
overwrite the settings, or No to abort the
operation and return to the configuration
window.
The configuration window contains the following
menus:
• File menu
• Tools menu
• Password menu
Note: Accessing menus or other windows could disrupt
communication with the other meter(s).
File Menu
The following options are available from the File
menu:
1. Save Configuration to save the present
settings to a file.
2. Load Configuration to load settings from a
file.
3. Export to HTML to save the present settings
to a HTML file.
4. Import from HTML to load settings from a
HTML file.
5. Print Configuration
Tools Menu
The following options are available from the Tools
menu:
1. Load Defaults to load the factory default
settings.
It is recommended to save a configuration
file before changing any setting and before
any calibration operation.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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26
Password Menu
The following options are available from the Password
menu:
1. Lock Meter to lock the meter and prevent
unauthorized changes.
2. Unlock Meter to unlock the meter and allow
changes to be made.
3. Change Password to change the unlock
password of the meter.
The password must be a four-digit
number; “0000” is the unlocked
password setting.
Input Tab
In the configuration window, click on the Input tab to
view the input options.
Set Up Input Type
Click on the arrow next to the 4 to 20 mA box and
then click on the desired input type.
Set Up Decimal Point
Click on the arrow next to the dd.dd box and then
click on the desired decimal point position. Decimal
point selection is available for 4-20 mA and 0-10 V
inputs only. The display scale and relay set/reset
points are adjusted according to the decimal point
selection.
Set Up Temperature Unit
Click on the arrow next to the Degrees F box and then
click on the desired temperature unit. Temperature
unit selection is available for Thermocouple and RTD
inputs only.
Set Up Temperature Sensor
Click on the arrow next to the Type J box and then
click on the desired temperature sensor. Temperature
sensor selection is available for Thermocouple and
RTD inputs only.
Thermocouple
Sensors
RTD Sensors
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Scaling Tab
In the configuration window, click on the Scaling tab
to view the scaling settings for process inputs (current
and voltage).
Relays/Alarms Tab
In the configuration window, click on the
Relays/Alarms tab to view the settings for the
relays/alarms.
Advanced Tab
In the configuration window, click on the Advanced
tab to view the advanced settings. Consult the meter
manual for further details.
Info Tab
In the configuration window, click on the info tab to
view the firmware number and version.
Customize Window
Click on Customize in the right click menu to open a
meter’s customize window. The following settings can
be programmed from this window:
1. Tag Number to identify a meter and optionally display it
on the meter. Pre-selected special characters may be
used in this field by simply dragging the desired symbol
into it.
2. Display Units to identify the engineering units of the
value being read and optionally display it on the meter.
Pre-selected special characters may be used in this
field by simply dragging the desired symbol into it.
3. Display Color to change the color of the meter display
on the screen.
4. Relay Tag to change the text label of the Relay Status
indicator(s).
5. Relay Color to change the color of the Relay Status
indicator(s).
Note: These settings are NOT saved to the meter.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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Serial Communication Setup
Addresses for PD8-765 and
MeterView are set to 00 at the
factory.
1. From the main window, click on Edit → Serial
Settings menu to access the Serial
Communication Setup.
2. Select correct communication port used for
Serial Adapter.
3. If timeout error is received, try another serial
port selection or check meter’s address.
To change the serial address of a meter, simply click
on Change Address in the right-click menu. This
setting is on a per-meter basis.
Note: Baud rate is set up for 2400 bps at the factory.
Relays/Alarms Status
Each meter enabled in the main MeterView window
can display the current status of its relays/alarms (if
the meter Mode in the right-click menu is set to
Relays) and can allow the user
to remotely acknowledge the relays/alarms
(if applicable). The text labels and colors for the status
indicators may be customized through the Customize
window.
Logging Meter Data to File
1. Click on the arrow next to the Interval box to
select an interval from 2 to 60 or select manual
to log the data only when the Log button is
clicked (Log button is only visible when
manual is selected).
2. Select seconds, minutes, or hours.
3. Click the Start button.
4. Select file location and enter a file name.
Click OK. MeterView will begin logging data
to the file.
Logging may be paused or stopped at any time.
MeterView will indicate logging and paused status
with corresponding message flashing in the main
window status bar. When logging, all other MeterView
functions and windows are not accessible.
Log File Sample
The HTML log file format contains pertinent
information related to the meter and logging
selections. Each log entry includes date and time,
tag number, serial address, display value, units
and relays/alarms status.
Page 29
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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29
Connections
All connections are made to removable screw
terminal connectors located at the rear of the meter.
• Use copper wire with 60°C or 60/75°C insulation
for all line voltage connections. Observe all safety
regulations. Electrical wiring should be performed
in accordance with all applicable national, state,
and local codes to prevent damage to the meter
and ensure personnel safety.
• 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 instrument is installed in a high voltage
environment and a fault or installation error
occurs, high voltage may be present on any lead
or terminal.
• Follow all fusing and wiring precautions
requirements for the instrument integrated to the
PD8 Series model number being connected.
To access the connectors, remove the enclosure
cover and unscrew the two captive screws that fasten
the electronics module. Signal connections are made
to de-pluggable connectors on the back of the
electronics module.
Some connectors may be provided already
connected. These connections are required for proper
operation of the ProtEX-MAX and should not be
removed unless instructed to by this manual.
Wires marked as being used for testing purposes
should be removed.
Grounding connections are made to the two ground
screws provided on the base – one internal and one
external.
After all connections have been completed and
verified, apply power to the unit.
Required & Factory Wired Connection
The ProtEX-MAX comes with a pre-wired connection.
This connection is detailed below and must be
maintained in order for the instrument to function
properly.
Figure 3: Integrated PD765 Trident Required
Connections
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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30
PD765 Trident Electronics Module Layout for PD8-765-6X5-10*
Figure 4. PD765 Trident Electronics Module Layout
Connector Labeling
The connectors label, affixed to the meter, shows the location of all connectors available with requested configuration. It
also identifies the location of the RTD/TC selector switch. The images below (and one above) show all connector
configurations for the PD8-765. Note that the connector in the upper left of the diagram has different configurations
based on the model.
Figure 5. Connector Labeling for PD8-765-6X0-10
Figure 6. Connector Labeling for PD8-765-6X3-20
Figure 7. Connector Labeling for PD8-765-7X0-00
Figure 8. Connector Labeling for PD8-765-7X5-00
Page 31
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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31
Power Connections
Power connections are made to a two-terminal
connector labeled POWER on Figures 4-8. See
Connector Labeling on page 30. The meter operates
regardless of DC polarity. The + and - symbols are
only a suggested wiring convention.
Figure 9. Power Connections
Signal Connections
Signal connections are made to a five-terminal
connector labeled SIGNAL shown in Figures 4-8. See
Connector Labeling on page 30. The COM (common)
terminal is the return for all types of inputs.
Current and Voltage Connections
The following figures show examples for current and
voltage connections.
There are no switches or jumpers to set up for current
and voltage inputs. Setup and programming is
performed through the front panel buttons.
Figure 10. Transmitter Powered by Internal Supply
(PD8-765-6X-10 and PD8-765-6X5-10)
Figure 11. Transmitter Powered by External Supply
or Self-Powered
The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.
The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.
Figure 12. Voltage Input Connections
The meter is capable of accepting any voltage from
-10 VDC to +10 VDC.
Thermocouple and RTD Connections
The following figures show examples for
thermocouple and RTD connections.
The RTD/TC selector switch must be set to the proper
position for the meter to accept the selected
temperature input.
The input type is selected using the Setup menu.
The selected thermocouple input must correspond to
the thermocouple sensor and wire type used.
Figure 13. Thermocouple Input Connections
Figure 14. Three-Wire RTD Input Connections
The meter accepts two, three, or four-wire RTDs.
The three-wire RTD connection has built-in lead wire
compensation.
12
AC or DC
POWER
Required External Fuse:
5 A max, Slow Blow
POWER CONNECTOR
+ -
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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32
Figure 15. Two-Wire RTD Input Connections
Lead wire compensation for two-wire RTDs can be
applied using the Adjust menu. See Offset Adjustment
(
Adj
) on page 48.
Figure 16. Four-Wire RTD Input Connections
The four-wire RTD connection is similar to the
three-wire. One of the leads of a four-wire RTD is not
connected and may be clipped off.
The three-wire connection provides sufficient lead
wire compensation to provide accurate readings even
with long leads.
RC Networks Available from Precision Digital
RC networks are available from Precision Digital and
should be applied to each relay contact switching an
inductive load. Part number: PDX6901.
Note: Relays are de-rated to 1/14th HP (50 watts) with an
inductive load.
Relays and 24 V Output Connections
Relay connections are made to a six-terminal
connector labeled RELAY1, RELAY2. See Connector
Labeling on page 30. The COM (common) terminals
of the relays should not be confused with the COM
(common) terminal of the SIGNAL connector. The
24 VDC output (available on AC powered units only)
is available at the connector labeled 24V OUT, next to
the relays connector.
Figure 17. Relay & 24 V Output Connections
Switching Inductive Loads
The use of snubbers to suppress electrical noise is
strongly recommended when switching inductive
loads to prevent disrupting the microprocessor’s
operation. The snubbers also prolong the life of the
relay contacts. Suppression can be obtained with
resistor-capacitor (RC) networks assembled by the
user or purchased as complete assemblies. Refer to
the following circuits for RC network assembly and
installation:
Figure 18. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 for each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:
1. Inductive relay rating is 1/14 HP (50 W) at 115/230 VAC
2. Use capacitors rated for 250 VAC.
3. RC networks may affect load release time of solenoid loads.
Check to confirm proper operation.
4. Install the RC network at the meter's relay screw terminals. An
RC network may also be installed across the load. Experiment
for best results.
Figure 19. Low Voltage DC Loads Protection
24V OUT
P+ P-COM NONO NC NC COM
RELAY2 RELAY1
4 36 5 2 1 2 1
C
R
C
R
Use a diode with a
reverse breakdown
voltage two to three
times the circuit voltage
and forward current at
least as large as the
load current.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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33
RS-485 Connections
The RS-485 connections are made to a five terminal
connector used for Modbus® RTU serial
communications. The RS-485 terminals include
Transmit Data (DO) and (/DO), Receive Data (DI) and
(/DI), and Signal Ground. See Serial Communications
(
serl
) on page 49 for more information.
There are two diagnostic LEDs: Transmit Data (TX),
and Receive Data (RX) to show when the meter is
transmitting and receiving data from other devices.
Figure 20. RS-485 Connections
RS-485 Multi-Drop Connection
When using more than one meter in a multi-drop
mode, each meter must be provided with its own
unique address. The meter address (Slave ID) can be
programmed between 1 and 247. The transmit delay
can be set between 0 and 199 ms. The parity can be
set to even, odd, or none with 1 or 2 stop bits.
To change the meter address:
1. Press and hold the Menu button for three
seconds to access Advanced Features menu of
the meter.
2. Press Up arrow until Serial (SErL) menu is
displayed and press Enter, Addr is displayed.
3. Press Enter to change meter address using Right
and Up arrow buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run
Mode.
Three-Wire Connections
In order to wire the five pins for use as a three-wire
half-duplex RS-485 connection, it is necessary to
create a jumper connection between DI to DO and /DI
to /DO- as shown below.
Figure 21. Three-Wire RS-485 Connections
__ __
DI DI DO DO
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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34
4-20 mA Output & Input Signal Connections
The PD8-765, with an optional 4-20 mA output, can
be used as an isolated temperature transmitter with a
big display by converting the thermocouple or RTD
input into an isolated 4-20 mA output.
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled
“mA OUT: I-, I+”. The 4-20 mA output may be
powered from an internal power supply (optional) or
from an external power supply.
Figure 22. 4-20 mA Output & Input Signal
Powered by PD8-765-6X3-20
Figure 23. 4-20 mA Output Signal
Powered by PD8-765-6X5-10
Figure 24. 4-20 mA Output Powered Externally
Models include PD8-765-6X3-00, PD8-765-7X3-00,
PD8-765-7X5-00
Other Uses for Transmitter Power Supplies
The most common use for the PD8-765’s two power
supplies is for the 200 mA transmitter power supply to
power the field transmitter and the other power supply
to power the 4-20 mA output from the meter.
However, the power supplies can be used in other
ways. For instance, for level transmitters that require
the use of a heated lens, the PD8-765’s 200 mA
power supply could be used to power both the heated
lens and the 4-20 mA signal from the transmitter.
Figure 25. PD8-765-6X5-10 Powers Both the Heater
and 4-20 mA Input Signal
External Button Contacts
The PD8-765 is equipped with four external button
contacts that can be used to remotely operate the
PD8-765’s front panel buttons. For instance, these
button contacts can be used to program the meter
and to remotely acknowledge/reset the relays:
Terminal
Programming
Operation
M
Menu R
Right Arrow
Reset Max/Min
U
Up Arrow
Display Max/Min
E
Enter
Acknowledge Relays
COM
SIGNAL CONNECTOR
mA+
21 3 54
V+ T+
EXC
2-Wire
4-20 mA
Transmitter
-
+
I-
mA OUT
P2-P1+
45 3 12
P2+
P1-
24V OUT
6
I+
Remote Display,
Chart Recorder,
etc.
+
-
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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35
Setup and Programming
There is no need to recalibrate the meter when first received from the factory.
The meter is factory calibrated prior to shipment for milliamps and volts with
calibration equipment that is certified to NIST standards.
Overview
There are no jumpers involved in the setup process of the meter. The RTD/TC selector switch, located between the
SIGNAL and SERIAL connectors, must be set accordingly for the meter to accept RTD or thermocouple inputs.
See Figures under Connector Labeling on page 30.
Setup and programming is done using MeterView or through the programming buttons.
After power and input signal connections have been completed and verified, apply power to the meter.
LED Status Indicators
LED
State
Indication
1
Steady
Alarm 1
2
Steady
Alarm 2
See Quick Interface Reference Guide on page 57
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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36
Programming Buttons
Button Symbol
Description
Press to enter or exit Programming Mode, view settings, or
exit max/min readings
Press to reset max/min readings or other parameter/function
assigned through the User menu
Press to display max/min readings or other
parameter/function assigned through the User menu
Press to acknowledge relays or other parameters/function
assigned through the User menu
• Press the Menu button to enter or exit the Programming Mode at any time.
• Press the Right arrow button to move to the next digit during digit or decimal point programming.
• Press or hold the Up arrow button to scroll through the menus, decimal point, or to increment the value of a digit.
• Press the Enter/Ack button to access a menu or to accept a setting.
• Press and hold the Menu button for three seconds to access the advanced features of the meter.
SafeTouch 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 DISABLE on the switch labeled
NO-CONTACT BUTTONS located on the connector
board.
To actuate a button, press one finger to the glass
directly over the marked button area. Then retract
finger more than three inches from the glass before
pressing the next button. When the cover is removed,
the four mechanical buttons located next to the
sensors are used. The sensors are disabled when a
mechanical button is pressed and will automatically
be re-enabled after 60 seconds of inactivity.
The SafeTouch Buttons are designed to filter normal
levels of ambient interference and to protect against
false triggering, however, it is recommended that the
SafeTouch Buttons be disabled (slide switch to
DISABLE) if there is an infrared interference source in
line-of-sight to the display.
The SafeTouch Buttons are configured by default to
duplicate the function of the front panel mechanical
pushbuttons associated with the integrated meter.
The symbols by each SafeTouch button correspond
to a mechanical button as shown in the above table.
SafeTouch Button Tips:
• To the extent possible, install the display facing
away from sunlight, windows, reflective objects
and any sources of infrared interference.
• Keep the glass window clean.
• Tighten the cover securely.
• Use a password to prevent tampering.
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ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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37
Display Functions and Messages
The meter displays various functions and messages
during setup/programming and operation. The
following table shows the displayed functions and
messages with their action/setting description.
Display
Parameter
Action/Setting
setu
Setup
Enter Setup menu
inpt
Input
Enter Input menu
4-20
4-20 mA
Set meter for 4-20 mA
input
0-10
0-10 VDC
Set meter for 10 VDC
input
rtd
RTD
Set meter for RTD input
a385
Alpha 385
Set = 0.00385
European curve 100
RTD
A392
Alpha 392
Set = 0.00392
American curve 100
RTD
tC
TC
Set meter for TC input
0 J
0 J
Type J
1 k
1 K
Type K
2 T
2 T
Type T
3 t.0
3 T.0
Type T, 0.1 resolution
4 E
4 E
Type E
f C
F or C
Set temperature scale
F
F
Set meter to Fahrenheit
C
C
Set meter to Celsius
dec.p
Decimal point
Set decimal point
prog
Program
Enter the Program menu
scal
Scale
Enter the Scale menu
Cal
Calibrate
Enter the Calibrate
menu
inp1
Input 1
Calibrate input 1 signal
or program input 1 value
dis1
Display 1
Program display 1 value
inp2
Input 2
Calibrate input 2 signal
or program input 2 value
dis2
Display 2
Program display 2 value
err
Error
Error, calibration not
successful, check signal
RELY
Relay
Enter the Relay menu
RLY1
Relay 1
Relay 1 setup
Act1
Action 1
Set relay 1 action
(automatic, latching, etc.)
Auto
Automatic
Set relay for automatic
reset
A-nm
Auto-manual
Set relay for automatic +
manual reset any time
LtCH
Latching
Set relay for latching
operation
L-CL
Latchingcleared
Set relay for latching
operation with manual
reset only after alarm
condition has cleared
Altr
Alternate
Set relays for pump
alternation control
oFF
Off
Disable relay and front
panel status LEDs
Disable relay’s fail-safe
operation
Set1
Set 1
Program set point 1
rSt1
Reset 1
Program reset point 1
Display
Parameter
Action/Setting
RLY2
Relay 2
Setup relay 2
Act2
Action 2
Set relay 2 action
(automatic, latching, etc.)
Set2
Set 2
Program set point 2
RSt2
Reset 2
Program reset point 2
FLSF
Fail-safe
Enter Fail-safe menu
FLS1
Fail-safe1
Set relay 1 fail-safe
operation
on
On
Enable fail-safe
operation
off
Off
Disable fail-safe
operation
FLS2
Fail-safe2
Set relay 2 fail-safe
operation
DLAY
Delay
Enter Time Delay menu
DLY1
Delay 1
Enter relay 1 time delay
setup
On1
On 1
Set relay 1 On time
delay
OFF1
Off 1
Set relay 1 Off time
delay
DLY2
Delay 2
Enter relay 2 time delay
setup
On2
On 2
Set relay 2 On time
delay
OFF2
Off 2
Set relay 2 Off time
delay
brek
Break
Set RTD/TC input break
relay behavior
Brk1
Relay 1 Break
Set relay 1 input break
relay behavior
Off
Off
Set relay to non-alarm
condition at break
On
On
Set relay to alarm
condition at break
Brk2
Relay 2 Break
Set relay 2 input break
relay behavior
Aout
Analog output
Enter the Analog output
menu
Scal
Scale
Enter the Scale menu
Dis1
Display 1
Program display 1 value
out1
Output 1
Program output 1 value
(e.g. 4 mA)
Dis2
Display 2
Program display 2 value
out2
Output 2
Program output 2 value
(e.g. 20 mA)
SEbr
Sensor break
Program TC or RTD
sensor break value for
analog out
pass
Password
Enter the Password
menu
unlC
Unlocked
Program password to
lock meter
loCd
Locked
Enter password to
unlock meter
9999
-1999
open
Flashing
display
Overrange condition
Underrange condition
Open TC or RTD sensor
Page 38
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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38
Main Menu
The main menu consists of the most commonly used
functions: Setup and Password.
• Press Menu button to enter Programming Mode
then press Up arrow button to scroll main menu.
• Press Menu, at any time, to exit and return to
Run Mode. Changes made to settings prior to
pressing Enter/Ack are not saved.
• Changes to the settings are saved to memory
only after pressing Enter/Ack.
• The display moves to the next menu every time a
setting is accepted by pressing Enter/Ack.
Setting Numeric Values
The numeric values are set using the Right and Up
arrow buttons. Press Right arrow to select next digit
and Up arrow to increment digit value.
The digit being changed is displayed brighter than the
rest.
Press the Enter/Ack button, at any time, to accept a
setting or Menu button to exit without saving changes.
The decimal point is set using the Up arrow button in
the Setup-decimal point menu.
Setting Up the Meter (setu)
The Setup menu is used to select:
1. Input signal the meter will accept
2. Decimal point position for process inputs
3. Units (F or C) for temperature inputs
4. Relay operation
5. 4-20 mA analog output setup
Press the Enter/Ack button to access any menu or
press Up arrow button to scroll through choices.
Press the Menu button to exit at any time.
Notes:
1. Selecting RTD or TC mode from the Input menu will include
the Fahrenheit/Celsius menu in the setup menu structure.
RTD will allow the selection of a decimal point location after
this menu and TC has a fixed decimal point location and will
not allow the selection of a decimal point location.
2. Relay menu is always available even if relays option is not
installed. Visual alarm indication is available through front
panel LEDs and MeterView software.
3. Analog Output menu is available if selected in the Advanced
Features menu. 4-20 mA output option board is installed and
set up at the factory.
Setting the Input Signal (inpt)
Enter the Input menu to set up the meter to display
current (4-20), voltage (0-10), thermocouple (tC), or
RTD (rtd) inputs.
The voltage input is capable of accepting any signal
from -10 to +10 VDC. Select voltage input to accept
0-5, 1-5, 0-10, or 10 VDC signals.
The current input is capable of accepting any signal
from -20 to 20 mA. Select current input to accept 0-20
or 4-20 mA signals.
Page 39
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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39
If RTD is selected, the display shows A385 or A392.
Select the coefficient to match the RTD sensor, either
0.00385 (A385, European curve) or 0.00392 (A392,
American curve). The display then shows the decimal
point menu, DEc.P. Select the decimal point resolution
as shown on page 39.
If TC is selected, scroll through the thermocouple
types and select the type matching the TC sensor.
The input signal must be connected to the appropriate
input terminals and the RTD/TC selector switch must
be set, see Figure 13. Thermocouple Input on page 31.
For thermocouple inputs, allow at least 30
minutes warm-up time for meter to reach
specified accuracy.
Setting the Decimal Point (dc.pt)
The decimal point for process inputs may be set with up
to three decimal places or with no decimal point at all.
The decimal point for RTD inputs may be set with
1 decimal place or none.
The decimal point for thermocouple inputs is fixed per
input selection.
Pressing the Up arrow moves the decimal point one
place to the right until no decimal point is displayed,
it then moves to the leftmost position.
Setting the Temperature Scale (F C)
Meters with a thermocouple or RTD input can be set
to display temperature in degrees Fahrenheit or
Celsius.
Press Up arrow to change selection.
Press Enter/Ack to accept.
Programming the Meter (prog)
The meter may either be scaled (ScAL) without
applying an input or calibrated (Cal) by applying an
input. The meter comes factory calibrated to NIST
standards, so for initial setup, it is recommended to
use the (ScAL) function.
The Program menu contains the Scale (ScAL) and the
Calibrate (Cal) menus.
Process inputs may be scaled or calibrated to any
display within the range of the meter.
Scaling the Meter (scal)
The process inputs (4-20 mA and 10 VDC) can be
scaled to display the process in engineering units.
A signal source is not needed to scale the meter; simply
program the inputs and corresponding display values.
For instructions on how to program numeric values
see Setting Numeric Values, page 38.
Note: The Scale menu is not available for temperature inputs.
Error Message (Err)
An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the meter
reverts to input 1, allowing the appropriate input
signals to be applied.
The error message might be caused by any of the
following conditions:
1. Input signal is not connected to the proper
terminals or it is connected backwards.
2. Wrong signal selection in Setup menu.
3. Minimum input span requirements not maintained.
4. Input 1 signal inadvertently applied to calibrate
input 2.
• Reverse Scaling
The meter can be scaled so that 4 mA represents
the high end of the process value range being
measured by the transmitter and 20 mA
represents the low end of the process value range.
Page 40
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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40
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to
complete the calibration or scaling of the meter.
Input range
Input 1 & input 2 span
4-20 mA
0.40 mA
10 VDC
0.20 VDC
TC
100F (56C)
RTD
50F (28C)
Calibrating the Meter (Cal)
The meter can be calibrated to display the process in
engineering units by applying the appropriate input
signals and following the calibration procedure.
The use of a calibrated signal source is required to
calibrate the meter.
Recalibrating Temperature Inputs (Cal)
Remember, the meter is calibrated at the factory
prior to shipment. Recalibration is recommended at
least every twelve months.
The Calibration (CAL) menu is used to recalibrate the
thermocouple and RTD inputs.
Allow at least 30 minutes warm-up time before
performing recalibration procedure to ensure
specified accuracy.
Recommended Calibration Points
To recalibrate the meter, it is recommended to use
the Fahrenheit scale; this will give a greater degree of
accuracy to the calibration. The scale can be changed
to the Celsius scale after calibration is completed. The
meter will display temperature accurately in any scale.
The following table shows the recommended low and
high calibration points for all types.
Type of
input
Input 1
(Low)
Input 2
(High)
Check
(Middle)
Type J T/C
32F
1182F
600F
Type K T/C
32F
1893F
960F
Type T T/C
32F
693F
360F
Type T T/C
32.0F
693.0F
360.0F
Type E T/C
32F
1652F
840F
100 RTD
(0.00385)
32F
100
1148F
320.12
590F
215.61
100 RTD
(0.00392)
32F
100
1127F
320.89
580F
215.87
Recalibration Procedure for Temperature Inputs
1. Connect signal to the meter using the
appropriate wire (e.g. type J thermocouple
wire to recalibrate type J input), see page 31.
2. Set up the meter to accept the selected input
(e.g. type J T/C), see page 38.
3. Set up the meter to display temperature in
degrees Fahrenheit, see page 39.
4. Apply signal corresponding to input 1 (32°F)
and program display 1 to 32, see page 40.
5. Apply signal corresponding to input 2
(1182°F for type J) and program display 2
accordingly, see page 40.
6. After the meter accepts input 2, the display
flashes the message CJr that indicates the
meter is sensing the cold junction reference.
This completes the recalibration procedure
for the selected input.
Recalibrating Process Inputs (ICal)
The Internal Calibration (ICAL) menu, located in the
Advanced features menu, is used to recalibrate the
current and voltage inputs. Recalibration is
recommended at least every twelve months.
Refer to Internal Calibration (ICal), page 51 for
instructions.
Page 41
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
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41
Setting the Relay Operation (rely)
This menu allows you to set up the operation of the
relays:
1. Relay action (ACT)
a. Automatic reset only (non-latching)
b. Automatic + manual reset at any time
(non-latching)
c. Latching (manual reset only)
d. Latching with Clear (manual reset only
after alarm condition has cleared)
e. Pump alternation control (automatic
reset only)
f. Off (relay and status LED disabled)
2. Set point
3. Reset point
4. Fail-safe operation
a. On (enabled)
b. Off (disabled)
5. Time delay
a. On delay (0-199 seconds)
b. Off delay (0-199 seconds)
6. Break Condition Behavior
a. Off (non-alarm condition)
b. On (alarm condition)
Acknowledging Relays
There are two ways to acknowledge relays
programmed for manual reset:
1. Via ACK (F3) SafeTouch through-glass button.
2. Remotely via terminal at the back of the meter by
a connector switch across terminals 4 and C.
Setting the Relay Action
The relays’ Action menu allows the user to set up the
operation of the relays. The relays may be set up for
any of the following modes of operation:
1. Automatic reset (non-latching)
2. Automatic + manual reset at any time (nonlatching)
3. Latching (manual reset only, at any time)
4. Latching with Clear (manual reset only after
alarm condition has cleared)
5. Pump alternation control (automatic reset
only)
6. Off (relay and status LED disabled)
The following graphic shows relay 1 action setup;
relay 2 is set up in a similar fashion.
Programming Set and Reset Points
High alarm indication: program set point above reset
point.
Low alarm indication: program set point below reset
point.
The deadband is determined by the difference
between set and reset points. Minimum deadband is
one display count. If set and reset points are
programmed the same, relay will reset one count
below set point.
Refer to page 37 for a description of
Display Functions and Messages
Quick Set Points
Press Up arrow and Menu at the same time to
access set/reset points quickly.
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Setting Fail-Safe Operation
The fail-safe operation is set independently for each
relay. Select on to enable or select off to disable
fail-safe operation.
Programming Time Delay
The On and Off time delays may be programmed for
each relay between 0 and 199 seconds. The relays
will transfer only after the condition has been
maintained for the corresponding time delay.
The On time delay is associated with the set point.
The Off time delay is associated with the reset point.
Setting Sensor Break Condition
The sensor break relay condition may be
programmed for each relay as On (alarm) or Off
(non-alarm). The relays will enter these states when a
sensor break is detected for RTD or thermocouple
inputs. These settings have no effect when current or
voltage inputs are selected.
Sensor Break Operation
The following graphs illustrate the operation of how
the meter reacts when a sensor break is detected.
Relay and Alarm Operation
The following graphs illustrate the operation of the
relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. For relay to turn back "on", signal
must go below set point, and then go above it.
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Low Alarm Operation (Set < Reset)
For Manual reset mode, ACK can be pressed anytime
to turn "off" relay. For relay to turn back "on", signal
must go above set point, and then go below it.
Time Delay Operation
The following graphs show the operation of the time
delay function.
If the signal crosses the set point, the On time delay
timer starts and the relay trips when the time delay
has elapsed. If the signal drops below the set point
(high alarm) before the time delay has elapsed, the
On time delay timer resets and the relay does not
change state. The same principle applies to the Off
time delay.
* Note: The LED is not affected by Time Delay when
“Automatic or Manual” reset mode is selected. Rather the
LED follows the set and reset points.
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High Alarm with Fail-Safe Operation (Set > Reset)
* Note: Relay coil is energized in non-alarm condition. In
case of power failure, relay will go to alarm state.
Low Alarm with Fail-Safe Operation (Set < Reset)
* Note: Relay coil is energized in non-alarm condition. In
case of power failure, relay will go to alarm state.
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Pump Controller with Dual-Pump Alternation
The PD8-765 can be used as a low-cost pump controller when combined with a continuous level transmitter. One of
the most common pump control applications is shown below: controlling and alternating two pumps. The goal is to
control the level between 1000 and 6000 gallons. The main pump turns on when the level reaches 6000 gallons and
pumps down to 1000 gallons and then shuts the pump off. The next cycle, the backup pump turns on at 6000 gallons
and shuts off at 1000 gallons. If at any time the active pump can’t keep the level below 7000 gallons, the other pump
would come on also.
Relay #1 turns the main pump on at 6000 gallons and
turns it off at 1000 gallons.
If the active pump is not able to keep up, and the level
reaches 7000 gallons, the other relay will start the
inactive pump as well.
With the Pump Alternation feature activated, the next
time the level reaches 6000 gallons, relay #2 starts
the backup pump.
When the level falls below 1000 gallons, both pumps
will turn off.
Pump Alternation Control Operation
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Scaling the 4-20 mA Analog Output (Aout)
The 4-20 mA analog output can be scaled to provide
a 4-20 mA signal for any display range selected.
No equipment is needed to scale the analog output;
simply program the display values to the
corresponding mA output signal.
The Analog Output menu appears in the Setup menu
only on meters that are equipped with a 4-20 mA
output. This menu is enabled or disabled at the
factory via the Advanced Features menu. For more
information on the Advanced Features Menu, see
page 47.
The Analog Output menu is used to program:
1. 4-20 mA output based on display values
2. Sensor break value in mA
For instructions on how to program numeric
values see Setting Numeric Values, page 38.
Program the Sensor Break Output Value (SEbr)
The sensor break value corresponds to the output
signal generated when the meter detects a sensor
break for thermocouple and RTD inputs.
For example, if there is an open thermocouple, the
meter displays the message “open” and the analog
output goes to the programmed sensor break value
(e.g. 3.00 mA).
The sensor break value can be programmed from
0.00 to 23.99.
The typical output signal range is 1.00 to 23.00 mA
(e.g. If sensor break value is programmed to 0.00, the
actual output will not be greater than 1.00 mA).
Analog Output when Display is Out of Range
The analog output reflects the display out of range
conditions as follows:
Input
Condition
Display
Analog
Output
Underrange
Flashing -1999
3.00 mA
Overrange
Flashing 9999
21.00 mA
Open TC or
RTD
Flashing open
Sensor break
value
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Setting Up the Password (pass)
The Password menu is used to program a four-digit
password to prevent unauthorized changes to the
programmed parameter settings.
Locking the Meter
Enter the Password menu and program a four-digit
password.
For instructions on how to program numeric values
see Setting Numeric Values, page 38.
Record the password for future reference.
If appropriate, it may be recorded in the space
provided.
Model:
Serial Number:
Password:
__ __ __ __
Unlocking the Meter
If the meter is password protected, the correct
password must be entered in order to make changes
to the parameter settings.
Entering the correct four-digit number sets the
password to 0000, disabling the protection.
Changes to the programmed parameter settings are
allowed only with the password set to 0000.
If the password entered is incorrect, the meter
displays LoCd (Locked) for about two seconds, then it
returns to Run Mode. To try again, press Enter/Ack
while the Locked message is displayed.
Forgot the Password?
The password may be disabled by the following
procedure:
1. Note display reading prior to pressing the Menu
button. Ignore decimal point and sign.
2. Access the Password menu, add 2 to the noted
reading and enter that number as the password
(e.g. display reading = -1.23, password = 0125)
Advanced Features Menu
To simplify the setup process, functions not needed
for most applications are located in the Advanced
Features menu.
Press the Right arrow and Menu button
simultaneously or hold the Menu button for
approximately 3 seconds to access the Advanced
Features Menu of the meter.
1. Available for temperature inputs only
2. Available for process inputs only
Advanced Features Menu & Display Messages
Display Functions and Messages
Display
Parameter
Action/Setting
adj
Adjust
Set offset adjustment for
temperature, not
available for process
inputs
fltr
Filter
Set noise filter value
byps
Bypass
Set filter bypass value
serl
Serial
Set serial communication
parameters
prot
Protocol
Enter the Protocol menu
PDC
PDC
Select PDC protocol
nmbs
Modbus®
Select Modbus® protocol
addr
Address
Set meter address
baud
Baud rate
Select baud rate
trdE
Transmit delay
Set transmit delay for
serial communication
prty
Parity
Select none, even, or
odd (Modbus® only)
tbyt
Byte-to-byte
Program byte-to-byte
timeout (silent time –
Modbus® only)
Copy
Copy
Enter copy function
send
Send
Send meter settings to
another meter
done
Done
Copy function completed
Selc
Select
Enter the Select menu
(function, cutoff, out)
Func
Function
Select linear or square
root function
Linr
Linear
Set meter for linear function
Sqrt
Square root
Set meter for square root
extraction
cutF
Cutoff
Set low-flow cutoff
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Display Functions and Messages
Display
Parameter
Action/Setting
out
Output
Set meter for either relay
or analog output
(factory set only; only
included in certain models)
Aout
Analog output
Set meter for analog
output option
rEly
Relay
Set meter for relay option
Aout
Analog output
Enable or disable analog
output
(factory set only; only
included in certain models)
Yes
Yes
Enable analog output
no
No
Disable analog output
Inty
Intensity
Select display intensity
ICal
Initial calibration
Enter initial calibration for
process inputs
Curr
Current
Calibrating current input
I lo
I low
Calibrate low current
input
I Hi
I high
Calibrate high current
input
volt
Volt
Calibrating voltage input
Vlo
V low
Calibrate low voltage
input
VHi
V high
Calibrate high voltage
input
diag
Diagnostics
Display parameter settings
led
LED
Test display
CJC
CJC
Display cold junction
compensation voltage
Cfg
CFG
Display meter
configuration
pts
Points
Display calibration points
for process inputs
RELY
Relays
Display relay settings
Aout
Analog output
Display analog output
settings
GoFF
Gain/offset
Display gain and offset
for process inputs
SErL
Serial
Display serial
communication settings
Info
Information
Display software version
and S/N information
Offset Adjustment (Adj)
This parameter allows the user to select an offset
adjustment to the temperature being displayed. Offset
adjustment values can be either positive or negative
and can be any number within 19.9. The offset
adjustment value is programmed through the Adjust
menu.
The offset adjustment feature can be useful to
compensate for errors due to thermocouple junctions
or excessive lead wire resistance in RTDs.
The offset adjustment value is automatically reset to
zero whenever the type of temperature sensor is
changed (i.e., Thermocouple type or RTD curve).
Celsius/Fahrenheit conversion of the offset
adjustment value is automatic, see note 2 below for
important limitations.
Notes:
1. Offset adjustment is available only when TC or
RTD input is selected.
2. If adjustment value is greater than 11C and the
temperature scale is changed to Fahrenheit, the
maximum applied adjustment will be 19.9F.
Noise Filter (fltr)
Most applications do not require changing this
parameter. It is intended to help attain a steady
display with an unsteady (noisy) input signal.
The field selectable noise filter averages any minor or
quick changes in the input signal and displays the
reading with greater stability.
Increasing the filter value will help stabilize the
display, however this will reduce the display response
to changes on the input signal.
The filter level may be set anywhere from 2 to 199.
Setting filter value to zero disables filter function, and
bypass setting becomes irrelevant.
Noise Filter Bypass (byps)
The meter can be programmed to filter small input
changes, but allow larger input changes to be
displayed immediately, by setting the bypass value
accordingly.
If the input signal goes beyond the bypass value, it
will be displayed immediately with no averaging done
on it.
The noise filter bypass value may be set anywhere
from 0.2 to 99.9. It corresponds to percentage of full
scale for process inputs and to degrees Fahrenheit for
temperature inputs.
Increasing the bypass value may slow down the
display response to changes on the input signal.
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Serial Communications (serl)
The meter is equipped with serial communications
capability as a standard feature using PDC protocol
and MeterView software or using the Modbus® RTU
protocol. The Modbus® RTU protocol is included on
all models after 5/1/2010. To communicate with a
computer or other data terminal equipment, an
RS-232, RS-485, or USB adapter option is required;
see Ordering Information on page 7 for details.
When using more than one meter in an RS-485
multi-drop mode, each meter must be provided with
its own unique address. The address may be
programmed from 00 to 99 for PDC protocol and from
1 to 247 for Modbus® protocol. The transmit delay
may be set between 0 and 199 ms (see Serial
Communication Adapter manual for more details).
The PD8-765 can also be connected directly to
another PD8-765 through a cable assembly
(PDA7420). This allows the user to copy all the
settings from one meter to another, using the Copy
function.
Protocol Selection Menu (Prot)
The Protocol selection menu is used to select either
the PDC or the Modbus® protocol. PDC protocol
should be selected to run MeterView software.
Select Menu (SElc)
The Select menu is used to select linear or square
root function, display intensity, and low-flow cutoff.
Selection for relay or analog output is a factory setting
depending on the option installed.
• Output options are installed and set up at the
factory.
• Changing the output selection will cause
erroneous operation.
Note: Depending on meter model, the Select menu will
display either out or Aout. In either case, the output selection
menu is for factory use only. Do not attempt to change
output selection.
Linear or Square Root Function (linr or Sqrt)
Meters are set up at the factory for linear function.
The linear function provides a display that is linear
with respect to the input signal.
The square root function is used to linearize the signal
from a differential pressure transmitter and display
flow rate in engineering units.
Low-Flow Cutoff (cutF)
The low-flow cutoff feature allows the meter to be
programmed so that the often-unsteady output from a
differential pressure transmitter, at low flow rates,
always displays zero on the meter.
The cutoff value may be programmed from 0 to 9999.
Below the cutoff value, the meter will display zero.
Programming the cutoff value to zero disables the
cutoff.
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Display Intensity (inty)
The Display Intensity function allows the selection of
eight levels of intensity for various lighting conditions.
Meter Copy Function (Copy)
The Copy function is used to copy (or clone) all the
settings from one meter to other meters requiring
exactly the same setup and programming (i.e. type of
input, scaling, decimal point, filter, bypass, etc.).
Copy Function Requirements
To successfully copy settings from one meter to
another, both meters must have:
1. Same software version
2. Same baud rate setting
3. PDC protocol selected
See Determining Software Version,
page 53 for instructions.
Meter Cloning Instructions
• Do not connect the two meters to the same
4-20 mA loop while cloning. Internal calibration
may be affected.
• Connect the two meters using cable assembly
PDA7420 or equivalent (e.g. Digi-Key P/N
H1663-07-ND). Cable should not exceed
7' (2.1 m).
1. Power up both meters. Leave Clone meter in
Run Mode.
2. Enter the Advanced Features Menu of the
Master meter, see Advanced Features Menu,
page 47.
3. Scroll to Copy function using Up arrow button
then press Enter/Ack.
4. The meter displays the message Send. Press
Enter/Ack, the display flashes while sending
data. The message done is displayed when
copying is completed.
5. The Clone meter displays the memory address
being programmed then the message done
when copying is completed. The meter
initializes and returns to Run Mode using the
same settings as the Master.
6. If meter to be cloned does not respond to the
data being sent, refer to Copy Function
Requirements above.
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Internal Calibration (ICal)
• There is no need to recalibrate the meter
when first received from the factory.
• The meter is factory calibrated prior to
shipment, for all input types, in milliamps,
volts, and degrees respectively. The
calibration equipment is certified to NIST
standards.
The internal calibration allows the user to scale the
meter without applying a signal. This menu is not
available if the meter is set up for TC or RTD inputs.
The use of calibrated signal sources is necessary to
perform the internal calibration of the meter.
Check calibration of the meter at least every
12 months. Each input type must be recalibrated
separately, if meter will be used with all input types.
Notes:
• If meter is in operation and it is intended to accept
only one input type (e.g. 4-20 mA),
recalibration of other inputs is not necessary.
• Allow the meter to warm up for at least 30 minutes
before performing the internal calibration
procedure.
The Internal calibration menu is part of the Advanced
Features Menu.
1. Press the Up arrow button to scroll to the Internal
calibration menu and press Enter/Ack.
2. The meter displays either current (Curr) or
voltage (volt), according to the meter input
setup. Press Enter/Ack to start the calibration
process.
Example for current input internal calibration:
3. The meter displays Low input current (I lo).
Apply the low input signal and press Enter/Ack.
The display flashes for a moment while meter is
accepting the low input.
4. After the display stops flashing, a number is
displayed with the leftmost digit brighter than the
rest. The bright digit is the active digit that can be
changed by pressing the Up arrow button. Press
the Right arrow button to move to the next digit.
5. Set the display value to correspond to the input
signal being calibrated.
6. The display moves to the high input calibration
(I Hi). Apply the high input signal and press
Enter/Ack.
7. Set the display for the high input calibration in the
same way as it was set for the low input
calibration.
For instructions on how to program numeric
values see Setting Numeric Values, page 38.
The graphic above shows the calibration of the
current input. The voltage input is calibrated in a
similar way.
Tips:
• Low and high input signals can be any valid
values within the range of the meter.
• Observe minimum input span requirements
between input 1 and input 2.
• Low input must be less than high input
signal.
Error Message (Err)
An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the meter
reverts to input 1, allowing the appropriate input
signals to be applied.
The error message might be caused by any of the
following conditions:
1. Input signal is not connected to the proper
terminals, or it is connected backwards.
2. Wrong signal selection in Setup menu.
3. Minimum input span requirements not
maintained.
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to
complete the calibration or scaling of the meter.
Input range
Input 1 & input 2 span
4-20 mA
0.40 mA
10 VDC
0.20 VDC
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Meter Operation
For process inputs, the meter is capable of accepting
positive and negative signals and displaying these
signals in engineering units from -1999 to 9999
(e.g. a signal from -10 to +10 VDC could be displayed
as -10.00 to 10.00).
The temperature inputs are displayed according to the
input type and temperature units (F or C) selected.
RTD and Type T thermocouple inputs can be
displayed with either 1 or 0.1 resolution.
Buttons Operation
Button Symbol
Description
Press to enter or exit
Programming Mode, view
settings, or exit Max/Min
readings
Hold to enter Advanced
Features Menu
Press to reset Max/Min
readings
Press to display Max/Min
readings alternately
Press to display Max/Min
reading indefinitely while
displaying Max/Min
Press ACK to acknowledge
relays
For Interactive Virtual Meter Demo
visit predig.com/tvm
Maximum/Minimum Readings
The main function of the front panel buttons during
operation is to display the maximum and minimum
readings reached by the process or temperature
inputs.
1. Press Up arrow/Max button to display maximum
reading since the last reset/power-up.
2. Press Up arrow/Max again to display the
minimum reading since the last reset/power-up.
3. Press Enter/Ack to hold Max/Min display
reading, the meter will continue to track new
Max/Min readings.
4. If Enter/Ack is not pressed, the Max/Min display
reading will time out after ten seconds and the
meter will return to display the actual reading.
5. Press Right arrow/Reset button to reset Max/Min
while reading is being displayed. Max/Min display
readings are reset to actual reading.
Remote Operation of Meter Buttons
The PD8-765 is equipped with four external button
contacts that can be used to remotely operate the
PD8-765’s front panel buttons. For instance, these
button contacts can be used to program the meter
and to remotely acknowledge/reset the relays:
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Troubleshooting
For an Interactive Virtual
Meter Demo visit predig.com/tvm
Due to the many features and functions of the meter,
it’s possible that the setup of the meter does not
agree with what an operator expects to see. If the
meter is not working as expected, refer to the
Diagnostics menu and consult the recommendations
described below.
It may also be helpful to program the meter using
MeterView software. A free USB adapter can be sent
to you if you register your meter.
Diagnostics Menu (diag)
The Diagnostics menu is located in the Advanced
Features Menu, to access Diagnostics menu see
Advanced Features Menu, page 47.
It provides an easy way to view the programmed
parameter settings for troubleshooting purposes.
Press the Enter/Ack button to view the settings and
the Menu button to exit at any time.
For a description of the diagnostics messages see
Advanced Features Menu
& Display Messages,
page 47.
Determining Software Version
To determine the software version of a meter:
1. Go to the Diagnostics menu (diAG) and
press Enter/Ack button.
2. Press Up arrow/Max button and scroll to
Information menu (Info).
3. Press Enter/Ack to access the software
number (SFT), version (UER). Write down the
information as it is displayed. Continue
pressing Enter/Ack until all the information
is displayed.
Reset Meter to Factory Defaults
When the parameters have been changed in a way
that is difficult to determine what’s happening, it might
be better to start the setup process from the factory
defaults.
Instructions to load factory defaults:
1. Enter the Advanced Features Menu. See
Advanced Features Menu, page 47.
2. Press Up arrow to go to Diagnostics menu
3. Press and hold Right arrow/Reset for five
seconds, press Enter/Ack when display
flashes reset.
Note: If Enter/Ack is not pressed within three
seconds, display returns to Diagnostics menu.
4. The meter goes through an initialization
sequence (same as on power-up) and loads
the factory default settings.
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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. MeterView
software allows the saving of all meter parameters to
a file for restoring meter settings, reporting, and
copying settings to other meters.
Model: ______________ S/N: _______________
Date: _______________
Parameter
Display
Default
Setting
User
Setting
Input type
inpt
4-20 mA
Decimal point
dd.dd
2 places
Programming
prog
Input 1
InP1
4.00 mA
Display 1
Dis1
4.00
Input 2
InP2
20.00 mA
Display 2
Dis2
20.00
Relay 1
Rly1
Action 1
Act1
Automatic
Set 1
Set1
7.00 Reset 1
RSt1
6.00 Relay 2
Rly2
Action 2
Act2
Automatic
Set 2
Set2
10.00
Reset 2
RSt2
9.00 Fail-safe
flsf
Fail-safe 1
Fls1
Off Fail-safe 2
Fls2
Off Time delay
dlay
On delay 1
On1
0 sec
Off delay 1
Off1
0 sec
On delay 2
On2
0 sec
Parameter
Display
Default
Setting
User
Setting
Off delay 2
Off2
0 sec
Break 1
Brk1
Off
Break 2
Brk2
Off
Password
pass
0000
(unlocked)
Advanced
Features
N/A
Adjust
Adj
0.0
(temp only)
Filter
fltr
10
Bypass
byps
0.2 Serial settings
serl
Protocol
pdC
PDC
protocol
Address
addr
00
Baud rate
baud
2400
Trans delay
trde
10 ms
Function
Func
Linear
Cutoff value
CutF
0.00
(disabled)
Output option
out/Aout
Factory set
only
Display
intensity
inty
Level 8
Modbus®
defaults
N/A
Address
addr
247
Parity
prty
Even
Byte-to-byte
timeout*
tbyt
0.01 sec
* Note: The byte-to-byte timeout setting might be updated
automatically depending on the baud rate selected and the
previous timeout setting. The minimum timeout allowed is
saved to memory if a lower value is entered (e.g. If user
enters 0.00 with a baud rate of 300, 0.06 is saved)
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Troubleshooting Tips
This meter is a highly sophisticated instrument with an extensive list of features and capabilities. If the front panel
buttons are used to program the meter, it may be a difficult task to keep everything straight. That is why we strongly
recommend the use of the MeterView software for all programming activities. A free USB adapter is available for
programming with MeterView software if you register your meter.
Symptom
Check/Action
No display at all
Check power at power connector
Not able to change setup or programming,
LoCd is displayed
Meter is locked, enter correct four-digit password to unlock
Meter does not respond to input change
If a Low-Flow Cutoff Value has been programmed, the meter will
display zero below that point, regardless of the input – which can
appear like the meter is not responding to an input change.
Check to make sure the problem is not being caused by an
undesired low-flow cutoff value.
Meter displays error message during
calibration (err)
Check:
1. Signal connections
2. Input selected in Setup menu
3. Minimum input span requirements
Meter displays
• open
• 9999
• -1999
• Displays negative number, not
responding to RTD.
Check:
1. Input selected in Setup menu
2. TC/RTD Switch position
3. Corresponding signal at Signal connector
Display alternates between
1. Hi and a number
2. Lo and a number
Press Menu to exit Max/Min
display readings.
Display response is too slow
Check filter and bypass values
Inaccurate temperature reading
Check:
1. Temperature units (F or C)
2. TC type or RTD curve selected
3. Offset adjustment
4. TC wire used
5. Calibration
If the display locks up or the meter does
not respond at all
Cycle the power to restart the microprocessor.
Relay operation is reversed
Check:
1. Fail-safe in Setup menu
2. Wiring of relay contacts
Relay and status LED do not
respond to signal
Check:
1. Relay action in Setup menu
2. Set and reset points
Meter not communicating with MeterView
or other programs
Check:
1. Serial adapter and cable
2. Serial protocol selected
3. Meter address and baud rate
4. MeterView address and baud rate
Page 56
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
56
Troubleshooting Tips
Symptom
Check/Action
SafeTouch buttons do not respond
1. If mechanical button was pushed, the SafeTouch buttons
will be re-enabled automatically 60 seconds after the last
button push.
2. If slide switch on connector board is in DISABLE position,
switch to ENABLE.
3. Strong direct sunlight may interfere with SafeTouch button
operation. It is recommended to operate the buttons by
standing so as to block direct sunlight.
Serial Communications Power LED
Indicator is off
Check
1. Modular cable connection
2. Power to the device
If only the TX (or DATA IN) data status
LED is flashing when serial
communications attempted
Check
1. Serial cable
2. Protocol selected on device
3. Instrument address & baud rate
4. Program address & baud rate
If both data status LEDs (TX and RX) are
off when trying to communicate
Remove all unnecessary cables and instruments from the bus.
Try getting the system to work with only one device (to ease
troubleshooting) and then expand the system one device at a
time.
Communications slow
Increase the baud rate
Random communication errors
1. Increase the TX delay time
2. Decrease the baud rate
Other symptoms not described above
Call Technical Support for assistance.
Note: Certain sequences of events can cause unexpected results. To solve these issues, it is best to start fresh from factory
defaults and use the manual as a step by step programming guide, rather than a random approach to programming. To reset the
meter to factory defaults, see Reset Meter to Factory Defaults on page 53. In addition, for best results, we recommend using the free
MeterView software for all programming needs.
Page 57
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
57
Quick Interface Reference Guide
Run Mode
Setup
Password
Display
Max/Min
Input
4-20 mA
0-10 V
RTD
TC
Decimal
Point
dddd
d . ddd
dd . dd
ddd . d
A385
A392
Type J
Type K
Type T
Type T.0
Type E
F
C
F or C
To Program
Locked Unlocked
TC or RTD?
Yes No
Relays
Relay 1
Relay 2
Failsafe
Delays
Action
Set point
Reset point
Auto
Auto & Manual
Latch
Latch w/Clear
Pump Alt
Off
To
Set point
Failsafe 1
Failsafe 2
To Delays
Delay 1
Delay 2
On
Off
Analog
output
Scale
Sensor
break
To Password
RTD or Type T
No Yes
Calibrate
Scale
TC or RTD?
Yes No
Program
To Relays
Page 58
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
58
Right Arrow & Menu
(or hold Menu for 3 sec)
Pushbutton Function
Menu Go to Programming Mode or leave Programming, Advanced
Features, and Max/Min Modes.
Right Arrow Move to next digit.
Up Arrow Move to next selection or increment digit.
Enter/Ack Accept selection/value and move to next selection.
Right Arrow & Menu simultaneously enters Advanced Features
Max/Min Mode
While in Run Mode, pressing Up Arrow will initiate Max/Min Mode. Up Arrow
toggles between Max & Min displays, and Right Arrow resets the Max/Min to the
current value. Press Menu or wait 10 seconds to return to Run Mode. Pressing
Enter/Ack will disable the 10 second timeout and continuously display Max or Min.
Press Right arrow and Menu
to access Advanced Features
Menu
When the meter is locked, Adjust,
Filter and Bypass can only display
their settings, and the Copy and
ICAL functions are not available.
Adjust
Filter
Bypass
Serial
Copy Send
TC or RTD?
Yes No
TC or RTD?
Yes No
Initial
Calibrate
Diagnostics
Select
Function
Cutoff
Output
Linear
Sq. Root
Address
TX Delay
Baud
Protocol
Parity
Modbus
PDC
Byte-to-byte
timeout
Modbus?
No Yes
Intensity
Program
Run
Max &
Min
Advanced
Features
Up Arrow
Menu
Menu
Menu
Menu
Operational Modes
Page 59
59
Page 60
ProtEX-MAX PD8-765 Explosion-Proof Process & Temperature Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
LIM8-765_F
SFT031 & SFT077 Ver 3.300 & up
04/22
Contact Precision Digital
Technical Support
Call: (800) 610-5239 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
Sales Support
Call: (800) 343-1001 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
Place Orders
Email: [email protected]
For the latest version of this manual please visit
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