- Explosion-Proof Process & Temperature Meter
- 4-20 mA, ± 10 V, TC & RTD Field Selectable Inputs
- 4-Digit Display, 1.20" (30.5 mm)
- SafeTouch™ Through-Glass Button Programming
- Display Mountable at 0°, 90°, 180°, & 270° Degrees
- Isolated 24 VDC @ 200 mA Transmitter Power Supply
- 2 Relays + Isolated 4-20 mA Output Options
- Free PC-Based MeterView™ Programming & Monitoring Software
- Sunlight Readable Display
- Operating Temperature Range: -40 to 65°C (-40 to 150°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 or 12-36 VDC
- Duplex Pump Controller with Alternation Capability
- External Contacts for Remote Button Operation
- Onboard RS-485 Serial Communications
- Modbus RTU Communication Protocol Standard
- Copy Meter Settings to Other PD8-765 Meters
- Max/Min Display
- 3-Year Warranty
The Only Explosion-Proof Process & Temperature Meter You Will Ever Need
The PD8-765 ProtEX-MAX is an explosion-proof version of the popular Trident X2 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 version 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.
Two relays and isolated 4-20 mA output options increase 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.
Table of Contents:
Process & Temperature Inputs
The PD8-765 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 Internal Supply (optional)
Transmitter Powered by External Supply 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 PD8-765 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.
The Trident meter accepts J,K,T or E thermocouples and 100 Ω platinum RTDs. For the T thermocouple and RTD, the user can display temperature to 1° or 0.1° resolution and the Type K thermocouple to 2300oF. In addition, these meters will operate down to -40°C with only mininal loss of accuracy.
|Type||Range||Acc (0-65°C)||Acc (-40-0o°C)||Resolution|
|J||-58° to 1382°F|
-50° to 750°C
|K||-58° to 2300°F|
-50° to 1260°C
|T||-292° to 700°F|
-180° to 371°C
|1° or 0.1°|
|E||-58° to 1700°F|
-50° to 927°C
|RTD||-328o° to 1382°F|
-200° to 750°C
|1° or 0.1°|
Explosion-Proof Temperature Transmitter with Huge Display
The PD8-765 ProtEx MAX, with the appropriate options, can be used as an explosion-proof, isolated temperature transmitter with a big display by converting the thermocouple or RTD input into an isolated 4-20 mA output.
Display Flow Rate From a DP Transmitter
DP Flow via Square Root Extraction
In this application, the PD8-765 is displaying flow rate by extracting the square root from the 4-20 mA signal from a differential pressure transmitter. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value.Back to top
Isolated Transmitter Power Supplies
24 V @ 200 mA Transmitter Power Supply
One of the most useful features of the PD8-765 is its 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 the PD8-765 so it will power the transmitter:
24 V @ 40 mA 4-20 mA Output Power Supply
Not only can the PD8-765 power the 4-20 mA input signal, but an additional power supply of 24 V @ 40 mA is available on select models to power the 4-20 mA output.
Isolated 4-20 mA 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!
Resettable 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 Transmitter 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.
External Power Supply for the 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:Back to top
Advanced Display Features
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 31⁄2 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.
Sunlight Readable Display
The intensity of the display on the ProtEX-MAX PD8-765 can be adjusted to compensate for various lighting conditions, including direct sunlight. In the advanced menu features menu, you can choose from eight levels of intensity depending on the visibility conditions.
The following diagram illustrates how to set the intensity on the PD8-765 process and temperature meter:
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!
Display & Toggle Maximum / Minimum 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.
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.
Back to top
Quick & Easy Scale & 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 PDA8006 Trident USB serial adapter.
Free PC-Based MeterView™ Software
Note: PD8-765 meter is not powered from USB connection and requires external power to be programmed.
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.
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).
Programming with Four SafeTouch™ Through-Glass Buttons
The PD8-765’s four SafeTouch™ through-glass buttons keep the user in control of the programming process. There is no need to remove the cover for programming. Just touch the glass over the SafeTouch™ buttons for navigating through the menus. Try out the Trident Virtual Meter at www.predig.com/tvm and see how simple it is to program the PD8-765. It programs the same exact way as the Trident panel meter version..
Programming From a PC with MeterView™
Precision Digital’s free MeterView™ software allows the 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. Below are examples of the various windows used to configure, scale, set relays / alarms, and program other advanced features.
- Input type
- Temperature units
- Sensor type
- Scale input
- Decimal point
- No cryptic codes
- Simple to use
- Select reset mode
- Set/reset points
- Fail-safe operation
- On & off delays
- Filter & bypass
- Transmit delay
- Display intensity level
- Function type
- Analog output scaling
- Sensor break
Save/Retrieve ConfigurationMeterView™ 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.
The PD8-765 makes a great front end to a PC-based data acquisition system. It is 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 PD8-765, 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 PD8-765 Meters
Sample File Generated by MeterView™
Relays for Alarm & Control Applications
Adding relays to the PD8-765 meter turns it into a sophisticated alarm device as well as a powerful, yet simple, alternative to a more complicated PLC system for control applications. One such application would be pump control using the PD8-765’s relays in pump alternation mode. The PD8-765 can be equipped with two 3 A Form C (SPDT) internal relays. Relays are highly user-configurable as the following MV screen shot indicates:
MeterView™ Software Specifications
System Requirements: Windows® 95/98/ME/NT4/2000/XP/ Vista/7*/ Windows® 10
Communications: RS-232 adapter or RS-485 adapters with an RS-232 to RS-485 or USB to RS-485 converter may be used for communicating with the meters.
Number of Meters: Up to 100 meters simultaneously with addressing capability; minimum scan time for 100 meters: 60 sec
Meter Address: 00 to 99
Baud Rate: 300 bps to 19,200 bps; selection must match the baud rate selected in the meters.
Screen Update Rate: Dependent on system and meter settings. Rates of up to 10 meters/second are attainable at 19,200 bps.
Configuration: Configure meter settings one meter at a time.
Configuration Report: Save configuration to PDC file format or export to HTML for printing, cloning, or restoring meter.
Logging Interval: 2 seconds to 60 hours or manual
Manual Logging: Data saved to file when Log button is pressed.
Data Logging Report: Log data to HTML file format. All enabled meters are logged to a single file.
Alarm Notification: Pop-up message indicates new alarm condition. Alarm alert notification may be disabled.
Event Log: Important events are logged with date and time stamp.
Relay/Alarm Status: Indicate relay/alarm status with customized color and message label. Relay status indication may be disabled.
Units & Tag Number: Show engineering units and tag number information; these settings are not saved to the meter.
Relay Acknowledge: Relays may be acknowledged by clicking on corresponding Relay Status button. Meters must be set up for manual reset and Relay Mode must be enabled in MeterView™.
*Note: Windows 32-bit operating systems onlyBack to top
4-20 mA Output & Relays
Isolated 4-20 mA Analog Output
There are several uses for the PD8-765’s isolated 4-20 mA output. For temperature applications, the isolated 4-20 mA output option turns the PD8-765 into an explosion-proof temperature transmitter with a huge display! For 4-20 mA input applications the isolated 4-20 mA output turns the PD8-765 into a signal isolator with the convenience of local display of the process variable. The 4-20 mA output can also be reversed scaled.
Linear 4-20 mA Analog Output
For applications where the input was linearized by the PD8- 765, the 4-20 mA output will represent that linearized value.
Convert Temperature Inputs to 4-20 mA Output with the PD8-765
The PD8-765, with the appropriate options, can be used as an isolated, explosion-proof, temperature transmitter with a big display by converting the thermocouple or RTD input into an isolated 4-20 mA output.
The 4-20 mA output can be reversed scaled such that 4 mA represents the high value and 20 mA represents the low value. For instance, a 4-20 mA output signal could be generated as the meter went from 100.0 to 0.0.
PD8-765 Provides 500 V of Isolation on the Output
The inputs and outputs of the PD8-765 ProtEX-MAX are electrically isolated to prevent ground loops and make wiring easier. All inputs, outputs and power supplies are fully isolated from one another.
The PD8-765 can provide 40 mA at 24 VDC to power the 4-20 mA output signal or an external power supply can be used:
The 4-20 mA output can either be programmed using the front panel push buttons or free MeterView™ software.
MeterView™ Software Programming
When a meter is programmed as shown to the
left, the output will be 4.00 mA when the
display reads 0.0 and the output will be 20.00
mA when the display reads 150.0.
The meter can be set up for reverse scaling
as shown to the left: the output will be 4.00
mA when the display reads 150.0 and the output
will be 20.00 mA when the display reads 0.0
Sensor Break: Analog output value when TC or
RTD sensor break is detected.
Relays for Alarm & Control Applications
Adding relays to the PD8-765 meter turns it into a sophisticated alarm device as well as a powerful, yet simple, alternative to a more complicated PLC system for control applications. One such application would be pump control using the PD8-765’s relays in pump alternation mode. The PD8-765 can be equipped with two 3 A Form C (SPDT) internal relays. The relays are highly user-configurable as the following screen shot from MeterView™ indicates:
Setting Set and Reset Points (HI / LO Alarms)
All relays are independent of each other and may be programmed as high or low alarms with user desired set and reset points. Setting a set point above a reset point results in a high alarm and setting a set point below a reset point results in a low alarm. Alarms have 0 – 100% deadband and set and reset points may be set anywhere in the range of the meter.
Resetting the Relays (Mode in MV)
All relays are independent of each other and may be programmed to reset (Mode in MV) in the following ways:
- Automatic: Alarm will reset automatically once the alarm condition has cleared.
- Automatic/Manual: Alarm will reset automatically once the alarm condition has cleared but can also be reset using the ACK front panel button* at any time.
- Latching: Alarm must be reset manually and can be done so at any time. Press the ACK front panel button* at any time to clear the alarm.
- Latching with Reset after Cleared: Alarm must be reset manually and can only be done so after the alarm condition has cleared. Press the ACK front panel button* after the alarm condition has cleared to reset the alarm.
* Or by connecting an external button to terminal 4 on the external button contacts.
Time Delay (On and Off)
In many applications it is desirable to wait before turning off or on a relay – such as waiting for a process to settle before taking action. Each relay on the ProtEX-MAX PD8-765 can be programmed independently with on and off time delays of 0 to 999.9 seconds to achieve this.
Relays Auto Initialization
When power is applied to the meter, the front panel LEDs and alarm relays will reflect the state of the input to the meter.
Signal Loss Relay Operation (Sensor Break)
The meter can be programmed so that when it detects a break in the RTD or thermocouple signal, the relay will go to either the alarm or non-alarm state.
Note: This does not apply to voltage or 4-20 mA signals.
User Selectable Fail-Safe Operation
All relays are independent of each other and may be programmed for user selectable fail-safe operation. With the fail-safe feature activated, the relays will transfer to the alarm state on power loss to the meter.
Relay connections are made to a six-terminal connector labeled RELAY1 and RELAY2.
Explosion-Proof Pump Controller with Dual-Pump Alternation
The PD8-765 can be used as an explosion-proof pump controller when combined with a continuous level transmitter. One of the most common pump control application 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.
If more than 2 relays are needed, consider the PD8-6000 ProtEX-MAX meter. Visit predig.com/PD8-6000 for details.Back to top
Modbus® RTU Serial Communications
With onboard RS-485 serial communication, the PD8-765 can communicate with any Modbus master device using the popular Modbus communications protocol that is included in every PD8-765.
Serial Adapters & Converters*
Precision Digital provides a variety of serial communication devices to interface the Trident meter with other devices.
Trident Meter Copy Cable
USB Serial Adapter for Programming Meter with MeterView Software
USB to RS-422/485 Isolated Converter
RS-232 to RS-422/485 Isolated Converter
*All adapters and converters are sold separately and supplied with appropriate cables.
Integrated External Button Contacts and Serial Communications
External Button Connections
Four external button contacts come standard with the ProtEX MAX PD8-765. These button contacts are used to remotely operate the front panel buttons and can be used for programming and resetting the relays.
Note: The integrated button contacts (1-4) function identically to the front panel pushbuttons / SafeTouch™ buttons (Menu, Reset, Max, & ACK) and are non- configurable.
Serial Communications Connections
PD8-765 meters come with an RS-485 connection for serial communications with other digital devices. The industry standard Modbus® RTU protocol is included with every meter.Back to top
The ProtEX-MAX PD8-765 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 PD8-765 features a 1.2" high 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 PD8-765 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 OFF setting on the THRU-GLASS BUTTONS switch located on the back of the electronics module, inside the enclosure.
Rugged Explosion-Proof Enclosure
The PD8-765 is housed in a rugged NEMA 4X, 7, & 9, IP68 die-cast aluminum enclosure, designed to withstand harsh environments in safe and hazardous areas.
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 PD8-765 is equipped with four slotted flanges for wall mounting or NPS 11⁄2" to 21⁄2" or DN 40 to 65 mm pipe mounting.
Flexible Mounting & Wiring
The PD8-765 features four 3⁄4" NPT conduit openings so that wiring can be routed to the most convenient conduit connection(s). Two 3⁄4" NPT metal conduit plugs with 12 mm hex key fitting come installed.
The PD8-765 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.
Perfect & Secure Fit Every Time
The internal cast rails ensure the PD8-765 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.
PDA-SSTAG Stainless Steel Tags
PDA-SSTAG is a laser etched stainless steel tag accessory for any Precision Digital meter. 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.
Hazardous Area Approvals
The PD8-765 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 PD8-765 can operate from -40 to 65°C (-40 to 150°F) meaning it can be installed in a wide variety of indoor and outdoor industrial applications. And over this range, the meter will drift no more than 0.005% of calibrated span/°C max from 0 to 65°C ambient and 0.01% of calibrated span/°C max from -40 to 0°C ambient. See page 19 for details.
Removable Screw Terminal Connectors
Industrial applications require screw terminal connections for easy field wiring and the PD8-765 goes one step further in convenience by making them removable also.Back to top
Videos To Watch
See all the features ProtEX-Max has to offer for the PD8-765 and other explosion-proof instruments.Back to top
SafeTouch™ Buttons & External Button Contacts
The main function of the SafeTouch™ buttons during operation is to display the maximum and minimum readings reached by the process or temperature inputs as well as acknowledge relays.
1. SafeTouch™ Button Functions
The following SafeTouch™ buttons can perform these functions:
2. Front Buttons Behind Glass
The front buttons behind the glass can be used to manually program the PD8-765 meter by removing the front cover. A more convenient way is to use the SafeTouch™ buttons or MeterView™ software. See manual for details.
3. External Button Contacts Available on PD8-765
The PD8-765 is equipped with four external button contacts that can be connected to another device to remotely program and operate the instrument.
|2||Right Arrow||Reset Max/Min|
|3||Up Arrow||Display Max/Min|
Dimensions Units: Inches (mm)Back to top
Calibrator & Signal Generator
PD9501 Multi-Function Calibrator
This PD9501 Multi-Function Calibrator has a variety of signal measurement and output functions, including voltage, current, thermocouple, and RTD.
Voltage Signal: 0-30 V, 0-25 mV, 0-100 mV output and measurement.
Current Signal: Active and passive 0-25 mA, 4-20 mA output and measurement.
Thermocouple: K, E, J, T, R, B, S, N output and measurement. Note: Output Range Starts from 0°C RTD: PT100 output and measurement.
Ohms: Output and measurement
- Measure and Source T/Cs, RTDs, Ohms, Current, Voltage
- Compact & Lightweight
- Battery or USB Powered
- Descriptive LCD Display
- 24 V Power to Drive the Transmitter
- Auto Stepping & Auto Ramping
- Selective Auto Off Mode
- LCD includes an LED backlight
PD9502 4-20 mA / 0-10 VDC 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.
- 0-20 / 4-20 mA or 0-10 / 2-10 VDC Ranges
- Simple to Use
- Compact Size
- 4-Digit LED Display
- One-Turn Adjustment Knob
- ±05 %±1 Count Accuracy
- Power 15-27 VDC or USB Power Bank
Connections on Back of PD8-765 Electronics Module
PD8-765-6X5-10Back to top