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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Digital Panel Meter

Digital Panel Meter

Product Code:Trident Series

Need more Info? (514) 354-2511 - 1-800-463-4363

  • 4-20 mA, ± 10 V, TC & RTD Inputs
  • NEMA 4X, IP65 Front
  • Shallow Depth Case 3.6" Behind Panel
  • Universal Power Supply 85-265 VAC
  • Two Relays Option with Alternation & Time Delays
  • 4-20 mA Analog Output Option
  • 24 VDC @ 200 mA Transmitter Power Option
  • RS-232, RS-485 Serial Communication Options
  • Free Modbus® RTU Protocol & LabVIEW™ Driver
  • Sunlight Readable Display
  • 3 Year Warranty
  • Free MeterView Software Download


Feature rich and simple to use
The Model 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 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 thermocouples. It 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 it 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 Display Sizes
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 rTrident X2 can be read easily from distances of up to 30 feet! Both meters are available with all Trident features. The intensity of the display on both versions of the Trident can be adjusted to compensate for various lighting conditions, including direct sunlight.


Versatile Operation
Look to the Trident meter for the key features and options you want and don't worry about getting bogged down in a confusing array of things you don't need. The Trident's Max/Min function, 2 relays, 4-20 mA output, serial communication, and free Modbus RTU protocol provide all the utility you need to handle all the common applications.
To display the maximum and minimum readings since the last reset/power-up, use the Up arrow/Max button
Powerful Relay Functionality
All relay functions are set up from the front panel or from a PC running MeterView® or LabView™ software.
  • Automatic reset only
  • Automatic or manual reset
  • Latching or non-latching relays
  • Pump alternation control
  • On and off time delays from 0 to 199 seconds
  • Fail-safe operation is user selectable
Pump Alternation
The Trident, in pump alternation mode, will automatically alternate two pumps:

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 transfers and starts the backup pump.
Isolated 4-20 mA Transmitter Output
The Trident's Isolated 4-20 mA output option converts the Trident into a transmitter with a digital display;
perfect for temperature applications!
Serial Communication Adapters & Converters

A wide variety of serial communication adapters and converters are available for the Trident meter. A serial adapter and Precision Digital’s free MeterView software allows the Trident to be programmed from a computer and to connect to a PC for data acquisition. Adapters are available for RS-232 and RS-485 communications. Converters are available for isolated and non-isolated RS-232 to RS-485 and USB to RS-485.
Modbus RTU
Use the Trident’s Modbus RTU communications to connect the Trident to a PLC, SCADA system or other digital device.


Easy Setup and Programming
The Trident is easily setup and programmed using the simple four-button programming method. The meter can also be programmed using a PC and Precision Digital's free MeterView software or "cloned" with the Copy function.
There is only one switch on the entire meter, no jumpers, and no need to ever open the case.
Programming with Four Front Panel Buttons
The Trident’s four front panel buttons keep the user in control of the programming process.
Trident Virtual Meter
Programming From a PC with MeterView®
Precision Digital's free MeterView software allows all PD765 Trident setup parameters to be programmed from a PC and to save the configuration settings to a file for reporting or programming other meters. Moreover, since the serial adapter is an external device, one serial adapter can program an infinite number of meters! To establish digital communications with the Trident from a PC, you will need a serial communications adapter. For an RS-232 connection, use a PDA7232 adapter. For a USB connection to a PC, you will only need a PDA8006 USB adapter. The PDA8006 is the perfect adapter to use with the Trident when the only serial communication required is for MeterView running on a PC. It is the least costly option as well.

The MeterView screen shot above shows how the input is selected. Notice there are tabs for Scaling, Relays/Alarms, Advanced, and Factory Values.
Meter Copy
The Copy function is used to copy (or clone) all the settings from one Trident meter to other Trident meters in less than 10 seconds. The Copy function is a standard feature on all meters. The Copy feature does not require a serial communication adapter, it only requires the optional cable assembly (PDA7420), see the ordering information for complete details.


NEMA 4 & AX Field Enclosures
Plastic, stainless steel, and painted steel NEMA 4X enclosures for up to 10 Trident meters.


Trident X2 inside PDA2801


Data Acquisition
Digital Panel Meters make a great front end to a PC-based data acquisition system. They are easy to set up, can be used for a wide range of inputs, will power the transmitter, and best of all provide a local display of the process. Precision Digital has the perfect package with its Trident Digital Panel Meters, a wide selection of serial adapters and converters and free MeterView software. Data is displayed on the PC and written to a file that could then be imported into a spreadsheet or other application.
Data Logging up to 100 Trident Meters
Sample File Generated by MeterView®

Great for tank level monitoring!

System consisting of 10 Tridents & MeterView
Qty Model Description
10 PD765-6R2-10 Trident with 2 Relays & 24 VDC Transmitter Supply
10 PDA7422 Trident RS-485 Serial Adapter
1 PDA8485-I USB to RS-422/485 Isolated Converter
1 PDA7503-2 MeterView Software for 1-10 Meters


Process & Temperature Inputs
The Trident is factory calibrated to accept 4-20 mA, ±10 VDC, type J, K, T, or E thermocouples and 100 Ω platinum RTDs. Process inputs can be scaled with or without applying an input for virtually any engineering units. Temperature inputs can be programmed to display in degrees Fahrenheit or Celsius and the type K thermocouple can display up to 2300 °F.
Current & Voltage Inputs
Setting up the meter to accept a current or voltage input could not be easier. All setup is performed with the front panel buttons and there are no switches or jumpers to deal with.

Transmitter Powered by External Supply

Transmitter Powered by Internal Supply (optional)
Current Overload Protection
To protect the instrument from unexpected current overload the current input circuit contains 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.
Thermocouple & RTD Inputs
Setting up the Trident to accept a thermocouple or RTD input is simply a matter of setting a switch at the rear of the case and selecting the input type from the menu. The meter accepts J, K, T, or E type thermocouples as well as two, three, or four-wire 100 Ω platinum RTDs.

Thermocouple and RTD Inputs
Connectors Location

Rear View


Quick Installation
The Trident is housed in a shallow-depth case that is designed for easy installation and servicing. The extra large front bezel is rated Type 4X, IP65. The mounting brackets are locked in place to make it easy to mount the meter in the panel. Removable screw terminal connectors make for easy and convenient wiring.
Mounting Dimensions
1. Panel cutout required: 1.772 x 3.622 (45 x 92)
2. Panel thickness: 0.040 – 0.250 (1.0 – 6.4)
3. Mounting brackets lock in place for easy mounting


Except where noted all specifications apply to operation at +25°C.
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 intensity levels
Front Panel NEMA 4X, IP65; panel gasket provided
Programming Methods Four front panel buttons, cloning with Copy feature, PC with MeterView or LabVIEW software, and Modbus registers. Certified LabVIEW driver available.
Noise Filter Programmable 2 to 199 (0 will disable filter)
Display Update Rate Process/RTD: 3.7-5/sec; TC: 1.8-2.5/sec
Overrange Display flashes 9999
Underrange Display flashes -1999
Recalibration All inputs 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.
-6R5 & -6X5 models only: 100 V output-to-24 VDC supply
Operating Temperature 0 to 65°C
Storage Temperature -40 to 85°C
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, 94V-0, color; gray
Weight 9.5 oz (269 g) (including options)
UL File Number E160849; 508 Industrial Control Equipment
Warranty 3 years parts & labor
Process Inputs
Inputs Field selectable: 0-20 mA, 4-20 mA, 1-5 V, ±10 V
Accuracy ±0.05% FS ±1 count; square root: ±0.1% FS ±2 counts
Function Linear or square root
Low-Flow Cutoff 0 to 9999 (0 disables cutoff function)
Decimal Point Up to 3 decimals: d.ddd, dd.dd, ddd.d, or dddd
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 M Ω, Current Range: 50-100 Ω,
varies with resettable fuse impedance
Input Overload Protected by automatically resettable fuse
Temperature Drift ±50 PPM/°C
Transmitter Supply Isolated, one or two transmitter supplies
  • P1: 24 VDC ±10% @ 200 mA max (-1 option)
  • P1 & P2: 24 VDC ±10% @ 200 mA & 40 mA max (-2 option)
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: 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 Ω
Sensor Break All relays and alarm status LEDs go to alarm state.
Type Range Accuracy Range Accuracy
J -58° to 1328°F ±2°F -50 to 750°C ±1°C
K -58º to 2300ºF ±2°F -50 to 1260°C ±1°C
T -292º to 700ºF ±2°F -180 to 371°C ±1°C
E -58º to 1700ºF ±2°F -50 to 927°C ±1°C
RTD -328º to 1382ºF ±1°F  -200 to 750°C ±1°C
Rating 2 Form C (SPDT); rated 3 A @ 30 VDC or 3 A @ 250 VAC resistive load; 1/14 HP @ 125/250 VAC inductive loads
Deadband 0-100% FS, user selectable
High or Low Alarm User may program any alarm for high or low
Relay Operation
  1. Automatic (non-latching)
  2. Latching
  3. Pump alternation control

Relay Reset: User selectable via front panel buttons or PC

  1. Automatic reset only (non-latching)
  2. Automatic plus manual reset at any time (non-latching)
  3. Manual reset only, at any time (latching)
  4. Manual reset only after alarm condition has cleared (latching).
Automatic Reset Relays reset when input passes the reset point
Manual Reset Front panel button, MeterView, Modbus registers
Time Delay 0 to 199 seconds, on and off delays; programmable
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.
Isolated 4-20 mA Transmitter Output
Scaling Range 1.00 to 23.00 mA; reverse scaling allowed.
Calibration Factory calibrated 4.00 to 20.00 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
External Power 35 VDC maximum
Output Loop Resistance LOOP RESISTANCE
Power Supply Minimum Maximum
24 VDC 10 Ω 700 Ω
35 VDC (external) 100 Ω 1200 Ω
Serial Communications
Compatibility EIA-232, EIA-422, and EIA-485 with PDA7232 and PDA7422 Trident adapters.
Protocol Two selectable. PDC protocol (for use with MeterView) and Modbus RTU
Meter Address PDC protocol: 0 to 99, Modbus protocol: 1 to 247
Baud Rate 300 to 19,200 bps
Transmit Time Delay Programmable 0 to 199 ms or transmitter always on for RS-422 communications.
Data 8 bit (1 start bit, 1 stop bit)
Parity None (2 stop bits), even, or odd (Modbus only; PDC protocol does not use parity)
Byte-to-Byte Timeout 0.01 to 2.54 seconds (Modbus only)
Turn Around Delay Less than 2 ms (fixed)
Refer to PDC and Modbus Serial Communications Protocol manuals for details.
Note: Both downloadable protocol register tables can be found in the documentation list below.


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