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PD765 Trident Process & Temperature Digital Panel Meter

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The Trident PD765 digital panel meter is one of the most versatile meters on the market and will satisfy a wide variety of process and temperature applications. Housed in an 1/8 DIN enclosure with a NEMA 4X front, the meter 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 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 intensity of the display can be adjusted to compensate for various lighting conditions, including direct sunlight. Programming and setup can be performed with the four front panel pushbuttons, free MeterView software, or using the copy function. Options for the PD765 include 2 relays, a 4-20 mA output, 24 V transmitter power supply, and Modbus® serial communications.


  • 4-20 mA, ± 10 V, TC & RTD Inputs
  • NEMA 4X, IP65 Front
  • Shallow Depth Case 3.6" Behind Panel
  • Operating temperature range of between -40°C and 65°C
  • 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

Trident PD765 Data Sheet
Trident PD765 Instruction Manual

General Specifications

  • 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: -40 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 O, Current Range: 50-100 O, varies with resettable fuse impedance
  • Input Overload: Protected by automatically resettable fuse
  • 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 O 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 O
  • Sensor Break: All relays and alarm status LEDs go to alarm state.


  • 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)
    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

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.


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