Precision Digital Corporation Trident Series User manual

Trident Series PD765 Process & Temperature Meters
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • [phone]
www.predig.com
•1/8 DIN Digital Panel Meter with NEMA 4X, IP65 Front
•4-20 mA, ± 10 V, TC & RTD Field Selectable Inputs
•Easy Field Scaling in Engineering Units without Applying an Input
•Full 4-Digit Display, 0.56" (14.2 mm) or 1.20" (30.5 mm)
•Shallow Depth Case Extends Only 3.6" (91 mm) Behind Panel
•Isolated 24 VDC @ 200 mA Transmitter Power Supply Option (AC Powered Models Only)
•2 Relays + Isolated 4-20 mA Output Options
•Free PC-Based MeterView Programming & Monitoring Software
•No Assembly Required
•Sunlight Readable Display
•Operating Temperature Range: -40 to 65°C (-40 to 149°F)
•UL & C-UL Listed. E160849; UL 508 Industrial Control Equipment
•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 (Trident X2 Only)
•USB, RS-232, & RS-485 Serial Communication Adapters Options
•Modbus RTU Communication Protocol Standard
•Copy Meter Settings to Other Trident Meters
•Password Protection
•Max/Min Display
•High & Low Alarms with Multiple Reset Actions
•Wide Assortment of NEMA 4X Enclosures for up to Ten Meters
•Light/Horn & Button Accessory for Trident X2
•Control Station Accessory for Remote Operation of Trident X2
•Stainless Steel Sun Hood Accessory Available
•3-Year Warranty

Trident Series PD765 Process & Temperature Meters
Instruction Manual
2
Disclaimer
The information contained in this document is
subject to change without notice. Precision Digital
makes no representations or warranties with
respect to the contents hereof and specifically
disclaims any implied warranties of
merchantability or fitness for a particular purpose.
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.
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.
© 2024 Precision Digital Corporation.
All rights reserved.
FREE MeterView
Programming Software
Note: Trident meter is not powered from USB connection
and requires external power to be programmed.
The easiest and quickest way to program your Trident
meter is to use the FREE MeterView software. We will
even send you a PDA8006 USB adapter, normally
sold for $47.00, at no cost if you register your meter at
www.predig.com/free8006 (limit one per customer).
You can program the Trident meter you just bought
with the front panel buttons and have the PDA8006
on hand for programming future meters.
MeterView 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
https://www.predig.com/meterview
In addition to programming, the software, with
additional devices, may be used for:
•Monitoring up to 100 Trident meters
•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 front
panel buttons and the instructions in this manual to do
so.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
3
Table of Contents
Introduction......................................................................................................... 6
Ordering Information.......................................................................................... 6
Specifications..................................................................................................... 8
General ............................................................................................................ 9
Process Input.................................................................................................. 9
Temperature Inputs ........................................................................................ 9
Relays Option................................................................................................ 10
Serial Communications................................................................................ 10
Isolated 4-20 mA Transmitter Output.......................................................... 10
External Button Contacts (X2 Models Only)............................................... 10
MOD-LH Light/Horn ...................................................................................... 11
Compliance Information................................................................................... 11
Safety............................................................................................................. 11
Electromagnetic Compatibility .................................................................... 11
EU Declaration of Conformity.......................................................................... 12
Safety Information............................................................................................ 12
Installation......................................................................................................... 13
Unpacking ..................................................................................................... 13
Panel Mounting............................................................................................. 13
Mounting Dimensions .................................................................................. 13
Connections.................................................................................................. 14
Connector Labeling ..................................................................................... 14
Power Connections ..................................................................................... 16
Signal Connections ..................................................................................... 16
Serial Communication ................................................................................. 17
Relays and 24 V Output Connections ......................................................... 18
Switching Inductive Loads........................................................................... 18
4-20 mA Output & Input Signal Connections............................................... 19
Isolated 4-20 mA Signal Splitters & Converters......................................... 20
Isolated 4-20 mA Signal Splitter.................................................................. 20
4-20 mA to 0-10 VDC Signal Converter....................................................... 20
External Button Contacts on Trident X2..................................................... 20
Four-Position Control Station for Remote Operation of Trident
PD765 X2 Buttons......................................................................................... 20
Setup and Programming.................................................................................. 21
Overview........................................................................................................ 21
Front Panel Buttons and Status LED Indicators........................................ 21
Display Functions and Messages................................................................... 22
Main Menu ..................................................................................................... 23
Setting Numeric Values................................................................................ 23
Setting Up the Meter (setu).......................................................................... 23
Setting the Input Signal (inpt).................................................................... 23
Setting the Decimal Point (dc.pt)................................................................. 24
Setting the Temperature Scale (F C)......................................................... 24
Programming the Meter (prog) .................................................................... 24
Scaling the Meter (scal)............................................................................. 24
Calibrating the Meter (Cal).......................................................................... 25
Recalibrating Temperature Inputs (Cal)...................................................... 25
Recalibrating Process Inputs (ICal)............................................................ 25
Setting the Relay Operation (rely)............................................................. 26
Relay and Alarm Operation......................................................................... 27
Scaling the 4-20 mA Analog Output (Aout)................................................. 31
Isolated 4-20 mA Signal Splitters & Converters........................................... 31
Program the Sensor Break Output Value (SEbr)......................................... 31
Analog Output when Display is Out of Range ............................................. 31

Trident Series PD765 Process & Temperature Meters
Instruction Manual
4
Setting Up the Password (pass) .................................................................. 32
Locking the Meter........................................................................................ 32
Unlocking the Meter .................................................................................... 32
Advanced Features Menu ............................................................................ 32
Advanced Features Menu & Display Messages.......................................... 32
Offset Adjustment (Adj)............................................................................... 33
Noise Filter (fltr)....................................................................................... 33
Noise Filter Bypass (byps).......................................................................... 33
Serial Communications (serl) .................................................................... 34
Protocol Selection Menu (Prot) .................................................................. 34
Select Menu (SElc)..................................................................................... 34
Linear or Square Root Function (linr or Sqrt).......................................... 34
Low-Flow Cutoff (cutF)............................................................................... 34
Display Intensity (inty)............................................................................... 35
Meter Copy Function (Copy)........................................................................ 35
Meterview Software .......................................................................................... 36
Remote Programming .................................................................................. 36
Data Acquisition ........................................................................................... 36
Monitoring..................................................................................................... 36
Monitoring System Parts.............................................................................. 36
MeterView Installation.................................................................................. 36
Running MeterView the First Time.................................................................. 36
Enable Meter and Select Meter Address..................................................... 36
MeterView Main Window .............................................................................. 37
Main Window Menus................................................................................... 37
Configuration Window.................................................................................. 38
File Menu..................................................................................................... 38
Tools Menu.................................................................................................. 38
Password Menu........................................................................................... 39
Input Tab..................................................................................................... 39
Set Up Input Type ....................................................................................... 39
Set Up Decimal Point.................................................................................. 39
Set Up Temperature Unit............................................................................. 39
Set Up Temperature Sensor........................................................................ 39
Scaling Tab ................................................................................................. 40
Relays/Alarms Tab...................................................................................... 40
Advanced Tab............................................................................................. 40
Info Tab....................................................................................................... 40
Customize Window....................................................................................... 40
Serial Communication Setup....................................................................... 41
Relays/Alarms Status................................................................................... 41
Logging Meter Data to File........................................................................... 41
Log File Sample .......................................................................................... 41
Internal Calibration (ICal)........................................................................... 42
Operation........................................................................................................... 43
Front Panel Buttons Operation.................................................................... 43
Maximum/Minimum Readings ..................................................................... 43
Remote Operation of Trident X2 Front Panel Buttons............................... 43
Troubleshooting............................................................................................... 44
Diagnostics Menu (diag).............................................................................. 44
Determining Software Version..................................................................... 44
Reset Meter to Factory Defaults.................................................................. 44
Factory Defaults & User Settings ................................................................ 45
Troubleshooting Tips................................................................................... 46
Quick Interface Reference Guide.................................................................... 47

Trident Series PD765 Process & Temperature Meters
Instruction Manual
5
Table of Figures
Figure 1. Panel Cutout and Mounting................................................................. 13
Figure 2. Meter Dimensions –Side View............................................................ 13
Figure 3. Case Dimensions –Top View.............................................................. 13
Figure 4. Connector Labeling for PD765-#R0-00 ............................................... 14
Figure 5. Connector Labeling for PD765-6R0-10 ............................................... 14
Figure 6. Connector Labeling for PD765-#R2-00 ............................................... 14
Figure 7. Connector Labeling for PD765-6R2-10 ............................................... 14
Figure 8. Connector Labeling for PD765-#R3-00 ............................................... 14
Figure 9. Connector Labeling for PD765-6R3-10 ............................................... 14
Figure 10. Connector Labeling for PD765-6R3-20 ............................................. 14
Figure 11. Connector Labeling for PD765-7R5-00 ............................................. 15
Figure 12. Connector Labeling for PD765-6R5-10 ............................................. 15
Figure 13. Connector Labeling for PD765-#X0-00.............................................. 15
Figure 14. Connector Labeling for PD765-6X0-10.............................................. 15
Figure 15. Connector Labeling for PD765-#X2-00.............................................. 15
Figure 16. Connector Labeling for PD765-6X2-10.............................................. 15
Figure 17. Connector Labeling for PD765-#X3-00.............................................. 15
Figure 18. Connector Labeling for PD765-6X3-10.............................................. 15
Figure 19. Connector Labeling for PD765-6X3-20.............................................. 16
Figure 20. Connector Labeling for PD765-7X5-00.............................................. 16
Figure 21. Connector Labeling for PD765-6X5-10.............................................. 16
Figure 22. Power Connections............................................................................ 16
Figure 23. Transmitter Powered by Internal Supply (Optional) ........................ 16
Figure 24. Transmitter Powered by External Supply or Self-Powered............. 16
Figure 25. Voltage Input Connections ................................................................ 16
Figure 26. Thermocouple Input Connections..................................................... 17
Figure 27. Three-Wire RTD Input Connections.................................................. 17
Figure 28. Two-Wire RTD Input Connections..................................................... 17
Figure 29. Four-Wire RTD Input Connections.................................................... 17
Figure 30. Relay & 24 V Output Connections..................................................... 18
Figure 31. AC and DC Loads Protection............................................................. 18
Figure 32. Low Voltage DC Loads Protection.................................................... 18
Figure 33. 4-20 mA Output & Input Signal Powered by Meter .......................... 19
Figure 34. 4-20 mA Output Powered by Meter ................................................... 19
Figure 35. 4-20 mA Output Powered Externally................................................. 19
Figure 36. Trident X2 Powers Both the Heater and 4-20 mA Input Signal....... 19
Figure 37. Passive 4-20 mA Output from Trident Meter Split into Two
Isolated 4-20 mA Signals ..................................................................................... 20
Figure 38. Passive 4-20 mA Output from Trident Meter Converted to 0-10
VDC Signal .......................................................................................... 20
Figure 39. Meter Copy Connection ..................................................................... 35

Trident Series PD765 Process & Temperature Meters
Instruction Manual
6
Introduction
The PD765 Trident digital panel meter is one of the
most versatile digital panel meters on the market and
will satisfy a wide variety of process and temperature
applications. The Trident 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 thermocouple types.
One of the most useful features of the Trident PD765
when it is AC powered is its ability to provide 24 VDC
to power the transmitter’s 4-20 mA signal. This
reduces costs and simplifies wiring. The Trident is
housed in a shallow-depth, 1/8 DIN enclosure that
features a NEMA 4X front panel and convenient
mounting hardware. There are two power options for
the Trident: 85 to 265 VAC or 12-36 VDC and certain
configurations of the AC powered meter can provide
24 VDC to power the transmitter, if needed.
Programming and setup can be performed with the
four front panel pushbuttons, free MeterView
software, or using the Copy function.
Two relays and isolated 4-20 mA output options
increase the utility of the Trident meter. 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.
The display height on the standard Trident meter is
0.56" (14.2 mm) and on the Trident X2 the display
height is an astounding 1.2" (30.5 mm). The Trident
X2 can be read easily from distances of up to 30 feet!
The intensity of the display on both versions of the
Trident can be adjusted to compensate for various
lighting conditions, especially direct sunlight.
Ordering Information
Trident
85-265 VAC
Model
12-36 VDC
Model
Options Installed
PD765-6R0-00
PD765-7R0-00
No options
PD765-6R0-10
24 V supply
PD765-6R2-00
PD765-7R2-00
2 relays
PD765-6R2-10
2 relays
24 V supply
PD765-6R3-00
PD765-7R3-00
4-20 mA output
PD765-6R3-10
4-20 mA output
24 V supply
PD765-6R3-20
4-20 mA output
dual 24 V supplies
PD765-7R5-00
2 relays
4-20 mA output
PD765-6R5-10
2 relays
4-20 mA output
24 V supply
Trident X2
85-265 VAC
Model
12-36 VDC
Model
Options Installed
PD765-6X0-00
PD765-7X0-00
No options
PD765-6X0-10
24 V supply
PD765-6X2-00
PD765-7X2-00
2 relays
PD765-6X2-10
2 relays
24 V supply
PD765-6X3-00
PD765-7X3-00
4-20 mA output
PD765-6X3-10
4-20 mA output
24 V supply
PD765-6X3-20
4-20 mA output
dual 24 V supplies
PD765-7X5-00
2 relays
4-20 mA output
PD765-6X5-10
2 relays
4-20 mA output
24 V supply
Accessories
Model
Description
PDA1024-01
24 VDC Power Supply for DIN Rail
PDA18DINSH
Stainless Steel Sun Hood
PDA7420
Trident Meter Copy Cable, 7' (2.1 m)
PDA7422
Trident RS-485 Serial Adapter
PDA7232
Trident RS-232 Serial Adapter
PDA7485-I
RS-232 to RS-485 Isolated Converter
PDA8006
USB Serial Adapter for Programming
Meter with MeterView Software*
PDA8232-N
USB to RS-232 Non-Isolated Converter
PDA8485-I
USB to RS-485 Isolated Converter
MOD-LH
Light/Horn / Enclosure Modification
PD659
Signal Isolators, Splitters, & Conditioners
PDA2360
Plastic Control Stations
PD9501
Multi-Function Calibrator
PD9502
Low-Cost Signal Generator
PDX6901
Snubber: 0.01 μF/470 Ω, 250 VAC
*See Free 8006 to receive PDA8006 at no charge.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
7
Light/Horn Accessories for Trident X2
Model
Description
MOD-LHRB1
Red Light/Horn and Button with
Holes Drilled in Enclosure(1)
MOD-LHGB1
Green Light/Horn and Button with
Holes Drilled in Enclosure(1)
MOD-LHYB1
Yellow Light/Horn and Button with
Holes Drilled in Enclosure(1)
MOD-LHBB1
Blue Light/Horn and Button with
Holes Drilled in Enclosure(1)
MOD-LHWB1
White Light/Horn and Button with
Holes Drilled in Enclosure(1)
MOD-LH5CB1
Light/Horn with User Choice of Red,
Green, Yellow, Blue or White Light,
Button, and Holes Drilled in
Enclosure(1)
PDA-BUTTON1R
Red Button
PDA-BUTTON1G
Green Button
PDA-BUTTON1B
Blue Button
PDA-LHR
Red Light/Horn
PDA-LHG
Green Light/Horn
PDA-LHY
Yellow Light/Horn
PDA-LHB
Blue Light/Horn
PDA-LHW
White Light/Horn
PDA-LHW
White Light/Horn
PDA-LH5C
Light/Horn with User Choice of Red,
Green, Yellow, Blue or White Light
Note:
1. The enclosure comes pre-drilled with holes for Light/Horn and
Button to be installed by user. Meter / controller and enclosure are
sold separately. The Light/Horn hole is located on the top in the
back left corner of the enclosure and the button hole is centered on
the front of the enclosure about an inch off the bottom of the door.
For mounting in different locations, order items separately and drill
holes and mount as desired.
PDA2360 Control Stations for Trident X2
Model
Description
PDA2360-E
Emergency Stop Button
PDA2361-A
1 Black Ack Button
PDA2361-Q
1 Black Silence Button
PDA2364-MRUE
4 Black Buttons: Menu, Right, Up,
Enter
Signal Splitter & Conditioner Accessories
Model
Description
PD659-1MA-1MA
Signal Isolator with One 4-20 mA
Input and One 4-20 mA Output
PD659-1MA-2MA
Signal Splitter with One 4-20 mA
Input and Two 4-20 mA Outputs
PD659-1V-1MA
Signal Conditioner with One 0-10
VDC Input and One 4-20 mA Output
PD659-1MA-1V
Signal Conditioner with One 4-20
mA Input and One 0-10 VDC Output
Enclosures
Series
Meters
Material
PDA2300
1-10
Plastic NEMA 4X
PDA2500
1-6
Plastic NEMA 4X
PDA2600
1-6
Stainless Steel NEMA 4X
PDA2700
1-6
Painted Steel NEMA 4
PDA2800
1-2
Plastic NEMA 4X
PDA3400
1-3
Plastic NEMA 4X
Need help selecting the right enclosure?
Go to www.predig.com/esu

Trident Series PD765 Process & Temperature Meters
Instruction Manual
8
8
Visit predig.com/pda18dinsh for more information.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
9
Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Display
Trident: 0.56" (14.2 mm);
Trident X2: 1.20" (30.5 mm) red LED,
4 digits (-1999 to 9999)
Display
Intensity
Eight user selectable levels. Default
intensity is 6.
Front Panel
NEMA 4X, IP65; panel gasket provided
Programming
Methods
Four front panel buttons, cloning with
Copy feature, PC with MeterView
software, and Modbus registers.
Noise Filter
Programmable from 2 to 199
(0 will disable filter)
Display
Update Rate
Process/RTD: 3.7-5/second
Thermocouple: 1.8-2.5/second
Overrange
Display flashes 9999
Underrange
Display flashes -1999
Recalibration
All ranges are calibrated at the factory.
Recalibration is recommended at least
every 12 months.
Max/Min
Display
Stored until reset by user or meter is
turned off.
Password
Restricts modification of programmed
settings.
Non-Volatile
Memory
Settings stored for a minimum of 10
years.
Power
Options
85-265 VAC, 50/60 Hz; 90-265 VDC,
20 W max or
12-36 VDC; 12-24 VAC, 6 W max.
Required Fuse
UL Recognized, 5 A max, slow-blow;
up to 6 meters may share one 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-24 VDC
supplies. For -6R5 & -6X5 models only:
100 V output-to-24 VDC supply
Operating
Temperature
-40 to 65°C (-40 to 149°F)
Storage
Temperature
-40 to 85°C (-40 to 185°F)
Relative Humidity
0 to 90% non-condensing
Connections
Power & Signal: removable screw
terminal blocks accept 12 to 22 AWG.
Serial: RJ11 header, standard on all
meters.
Enclosure
1/8 DIN, high impact plastic, UL 94V-0,
color: gray
Tightening
Torque
Screw terminal connectors:
5 lb-in (0.56 Nm)
Weight
9.5 oz. (269 g) (including options)
UL File Number
E160849; UL 508 Industrial Control
Equipment
Warranty
3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.
Process Input
Inputs
0-20 mA, 4-20 mA, 1-5 V, ±10 V
Transmitter
Supply
(AC Powered Models Only) 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
Temperature Drift
0 to 65C
ambient
-40 to 0C
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 parame-
ter 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 1382F
-50 to 750C
±2°F
±1°C
±5°F
±3°C
1°
K
-58 to 2300F
-50 to 1260C
±2°F
±1°C
±4°F
±2°C
1°
T
-292 to 700F
-180 to 371C
±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 1382F
-200 to 750C
±1°F
±1°C
±5°F
±3°C
1° or 0.1°

Trident Series PD765 Process & Temperature Meters
Instruction Manual
10
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 (X2 models only), 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 (nonalarm).
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.
Serial Communications
Compatibility
EIA-232, and EIA-485 with PDA7232
and PDA7422 Trident adapters.
Protocol
Modbus RTU
Meter
Address
PDC protocol: 0 - 99
Modbus protocol: 1 - 247
Baud Rate
300 –19,200 bps
Transmit
Time Delay
Programmable 0 to 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)
Turn Around
Delay
Less than 2 ms (fixed)
Refer to PDC and Modbus Serial Communication
Protocol manuals for details.
Isolated 4-20 mA Transmitter
Output
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
4 kV output-to-power line; 500 V input-
to-output or output-to-24 VDC supplies.
For -6R5 & -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 
Additional 4-20
mA Outputs
The PD659-1MA-2MA can split the
optional 4-20 mA output into two
isolated 4-20 mA outputs
0-10 VDC Output
The PD659-1MA-1V can convert the
optional 4-20 mA output to a 0-10 VDC
signal
PDA8006 Trident USB Adapter
Purpose
To be used only for programming the
Trident meter
Compatibility
USB 1.1, USB 2.0
Connectors
RJ11, and USB Type B
Cable
One 7' (2.1 m) standard modular cable
and one 3.28' (1.0 m) USB A-B Male
cable provided with adapter
Dimension
1.7" x 0.8" x 3.3"
43 mm x 21 mm x 83 mm)
(W x H x D)
Distance
Adapter to:
PD765/PD8-765 meter: 7' (2.1 m) max;
USB connection to PC: 10' (3 m) max
Driver
Compatibility
Microsoft®Windows®7/10/11
Power
USB Port
Status Indication
Separate LEDs for Power (P),
Transmit (TX), and Receive (RX)
External Button Contacts
(X2 Models Only)
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

Trident Series PD765 Process & Temperature Meters
Instruction Manual
11
Closed State
Closed contact button input terminal to
common/ground, active low 0 to 0.4 VDC
MOD-LH Light/Horn
Available for
these Models
Trident X2 only
Light Colors
MOD-LH Models: Red, green, yellow,
blue or white.
MOD-LH5CB1: User selectable: red,
green, yellow, blue, or white.
Light Action
Can be wired to flash (not available on
MOD-LH5CB1) or stay steady on
Light/Horn &
Button
Installation
When MOD-LH is ordered with an en-
closure, the user performs installation
and wiring of Light/Horn and Button in
predrilled holes.
Horn
85 dB
Rating
IP65
Light/Horn
Independence
Light and horn can be
controlled via separate relays
Power
Requirement
No additional power required when
wired to a Trident X2 meter. When
mounted remote: 24 VDC
Transmitter
Power Supply
The Trident X2's internal transmitter
power supply is capable of supplying
24 VDC @ 200 mA to power the
transmitter and other devices such as
the Light/Horn. The following table
illustrates how much of this current is
required to drive various Light/Horns. If
more current is needed, then consider
the PDA1024-01.
MOD-LH and MOD-LH5CB1 Models:
Color
Current Required
Color
Current Required
Red
17 mA
Blue
15 mA
Green
15 mA
White
42 mA
Yellow
23 mA
Horn
20 mA
Example: 17 mA (Red Light) + 20 mA (Horn) = 37 mA total
current needed from the 200 mA supply. Available current =
163 mA
Reset / Silence
Button
NEMA 4X; may be wired to the
external button contacts on Trident X2.
The Ack front panel button can be used
to reset / acknowledge the relays.
Button Labels
The Light/Horn accessory comes with 9
pre-printed message labels the user can
affix under the red button: RESET,
BATCH, ACK, TARE, SILENCE, STOP,
START, PAUSE, START/STOP.
Light/Horn
Mounting
Connection
M22
Hole Sizes
Light/Horn: 0.875" (22 mm)
Button
0.630" (16 mm)
Cable Length
3.28 feet (1 meter)
Operating
Temperature
Range
-5 to 40°C (23 to 104°F)
Compliance Information
Safety
UL Listed
USA and Canada
UL 508 Industrial Control Equipment
UL File Number
E160849
Front Panel
UL Type 4X, NEMA 4X, IP65; panel
gasket provided
Low Voltage
Directive
EN 61010-1
Safety requirements for measurement,
control, and laboratory use
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)
Power-
Frequency
Magnetic Field
30 A/m 70%V for 0.5 period
Voltage Dips
40%V for 5 & 50 periods
70%V for 25 periods
Voltage
Interruptions
<5%V for 250 periods
Note:
Testing was conducted on meters installed through the
covers of grounded metal enclosures with cable shields
grounded at the point of entry representing installations
designed to optimize EMC performance.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
12
EU Declaration of Conformity
For shipments to the EU and UK, a Declaration of
Conformity was printed and included with the product.
For reference, a Declaration of Conformity is also
available on our website www.predig.com/docs.
Safety Information
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock.
•Hazardous voltages exist within enclosure.
•Installation and service should be performed only
by trained service personnel.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
13
Installation
There is no need to remove the meter from its
case to complete the installation, wiring, and
setup of the meter.
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.
Panel Mounting
•Prepare a standard 1/8 DIN panel cutout –3.622"
x 1.772" (92 mm x 45 mm). Refer to Mounting
Dimensions for more details.
•Clearance: allow at least 4" (102 mm) behind the
panel for wiring.
•Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).
Recommended minimum panel thickness to
maintain Type 4X
rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm)
plastic panel.
•Remove the two mounting brackets provided with
the meter (back-off the two screws so that there is
¼" (6.4 mm) or less through the bracket. Slide the
bracket toward the front of the case and remove).
•Insert meter into the panel cutout.
•Install mounting brackets and tighten the screws
against the panel. To achieve a proper seal,
tighten the mounting bracket screws evenly until
meter is snug to the panel along its short side.
DO NOT OVER TIGHTEN, as the rear of the
panel may be damaged.
Figure 1. Panel Cutout and Mounting
Mounting Dimensions
Figure 2. Meter Dimensions –Side View
Figure 3. Case Dimensions –Top View
1.76"
(45mm)
0.59"
(15mm) 3.2"
(81mm)
2.45"
(62mm)
3.6"
(91mm)

Trident Series PD765 Process & Temperature Meters
Instruction Manual
14
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.
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 show all
connector configurations for the PD765. Note that the
connector in the upper left of the diagram has different
configurations based on the model.
Note: # on the following figures refers to power options.
(Example: PD765-6R0-00)
Figure 4. Connector Labeling for PD765-#R0-00
Figure 5. Connector Labeling for PD765-6R0-10
Figure 6. Connector Labeling for PD765-#R2-00
Figure 7. Connector Labeling for PD765-6R2-10
Figure 8. Connector Labeling for PD765-#R3-00
Figure 9. Connector Labeling for PD765-6R3-10
Figure 10. Connector Labeling for PD765-6R3-20

Trident Series PD765 Process & Temperature Meters
Instruction Manual
15
Figure 11. Connector Labeling for PD765-7R5-00
Figure 12. Connector Labeling for PD765-6R5-10
Figure 13. Connector Labeling for PD765-#X0-00
Figure 14. Connector Labeling for PD765-6X0-10
Figure 15. Connector Labeling for PD765-#X2-00
Figure 16. Connector Labeling for PD765-6X2-10
Figure 17. Connector Labeling for PD765-#X3-00
Figure 18. Connector Labeling for PD765-6X3-10

Trident Series PD765 Process & Temperature Meters
Instruction Manual
16
Figure 19. Connector Labeling for PD765-6X3-20
Figure 20. Connector Labeling for PD765-7X5-00
Figure 21. Connector Labeling for PD765-6X5-10
Power Connections
Power connections are made to a two-terminal
connector labeled POWER on Figures 4-21. See
Connector Labeling on page 14. The meter will
operate regardless of DC polarity connection. The +
and - symbols are only a suggested wiring convention.
Figure 22. Power Connections
Signal Connections
Signal connections are made to a five-terminal
connector labeled SIGNAL shown in Figures 4-21.
See page 14. Connector Labeling. The COM
(common) terminal is the return for all types of input
signals.
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 23. Transmitter Powered by Internal Supply
(Optional –AC powered units only)
Figure 24. Transmitter Powered by External Supply
or Self-Powered (Optional –AC powered units only)
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 25. Voltage Input Connections
The meter is capable of accepting any voltage from
-10 VDC to +10 VDC.
12
AC or DC
POWER
Required External Fuse:
5 A max, Slow Blow
POWER CONNECTOR
+ -

Trident Series PD765 Process & Temperature Meters
Instruction Manual
17
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 26. Thermocouple Input Connections
Figure 27. 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.
Figure 28. 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 33.
Figure 29. 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.
Serial Communication
Serial communication connection is made to an RJ11
connector labeled SERIAL. See Figures under
Connector Labeling on page 14.
Use PDA7232 for RS-232 interfacing.
Use PDA7422 for RS-485 interfacing.
Use PDA7420 for meter-to-meter interfacing for
cloning purposes (i.e. copying programmed settings
from one meter to other meters).

Trident Series PD765 Process & Temperature Meters
Instruction Manual
18
Relays and 24 V Output
Connections
Relay connections are made to a six-terminal
connector labeled RELAY1, RELAY2. See Figures
under Connector Labeling on page 14. The COM
(common) terminals of the relays should not be
confused with the COM (common) terminal of the
SIGNAL connector. The 24 VDC output is available at
the connector labeled 24V OUT, next to the relays
connector.
Figure 30. 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 31. 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 32. Low Voltage DC Loads Protection
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.
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.

Trident Series PD765 Process & Temperature Meters
Instruction Manual
19
4-20 mA Output & Input Signal
Connections
The Trident X2, 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 in-
put 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 33. 4-20 mA Output & Input Signal
Powered by Meter
Models include PD765-6R3-20 and PD765-6X3-20
Figure 34. 4-20 mA Output Powered by Meter
Models include PD765-6R5-10, PD765-6X5-10
Figure 35. 4-20 mA Output Powered Externally
Models include PD765-6R3-00, PD765-6X3-00,
PD765-7R3-00, PD765-7X3-00, PD765-7R5-00,
PD765-7X5-00
Other Uses for Transmitter Power
Supplies
The most common use for the Trident’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 Trident’s 200 mA power
supply could be used to power both the heated lens
and the 4-20 mA signal from the transmitter.
Figure 36. Trident X2 Powers Both the Heater
and 4-20 mA Input Signal
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.
+-
I-
mA OUT
56
I+
Remote Display,
Chart Recorder,
etc.
+-
24V OUT
P+ P-
12
External
Power
Supply-
+
I-
mA OUT
56
I+
Remote Display,
Chart Recorder,
etc.
+-
DW2206
POWER
SIGNAL
EXC T+V+ mA+ COM RTD
SWITCH
TC
SERIAL
TC
RTD
1 2 3 4 5 6
COM NONO NC NC COM
RELAY2 RELAY1
4 36 5 2 1
3 41 2 5
2 1
+
I-I+
mA OUT
6 5
24V OUT
2 1
P+ P-

Trident Series PD765 Process & Temperature Meters
Instruction Manual
20
Isolated 4-20 mA Signal
Splitters & Converters
Precision Digital offers DIN rail mountable signal split-
ters and converters to spit the optional 4-20 mA signal
into two isolated 4-20 mA signals or into a 0-10 VDC
signal.
Isolated 4-20 mA Signal Splitter
The Trident’s optional 4-20 mA output can be split into
two isolated 4-20 mA signals by using the model
PD659-1MA-2MA 4-20 mA signal splitter.
Figure 37. Passive 4-20 mA Output from Trident Meter
Split into Two Isolated 4-20 mA Signals
4-20 mA to 0-10 VDC Signal
Converter
The Trident’s optional 4-20 mA output can be con-
verted into a 0-10 VDC signal by using the model
PD659-1MA-1V 4-20 mA to 0-10 VDC signal converter.
Figure 38. Passive 4-20 mA Output from Trident Meter
Converted to 0-10 VDC Signal
External Button Contacts on
Trident X2
The Trident X2 is equipped with four external button
contacts that can be used to remotely operate the
Trident X2’s front panel buttons. For instance, these
button contacts can be used to program the meter
and to remotely acknowledge/reset the relays:
The external button contacts are particularly useful for
wiring up a remote button to reset the relays as
shown here:
Four-Position Control Station
for Remote Operation of Trident
PD765 X2 Buttons
The Trident PD765 X2's four programming and
operations buttons can be remotely controlled by
using the PDA2364-MRUE 4-button control station
accessory as shown in the diagram below.