Features
- Fully-Approved Explosion-Proof & Intrinsically Safe Loop-Powered Flow Rate/Totalizers
- 4-20 mA Input Displayed with ±0.02% of Full-Scale Accuracy
- 1.5 Volt Drop (4.7 Volt Drop with Backlight)
- Top Display: Five 12-Segment Alphanumeric Characters, 0.7" (17.8 mm)
- Bottom Display: Eight 14-Segment Alphanumeric Characters, 0.4" (10.2 mm)
- 20-Segment Bargraph Standard
- Display Mountable at 0°, 90°, 180°, & 270° (No Tools Required)
- CapTouch Through-Window Button Programming with Normal and Delayed Modes
- Loop-Powered Backlight with Red Backlight for Alarm Conditions
- 8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines
- Display Rate & Total Simultaneously
- Reset Total / Grand Total with CapTouch Button and Digital Input
- Automatic or Manual Batch Control
- Display Open Channel Flow with Programmable Exponent Feature
- 32-Point Linearization and Square Root Extraction
- (2) Open Collector Outputs Standard; Assignable to Pulse, Alarm, Timer, or Stopwatch
- (2) Optional Solid-State Relays; Assignable to Alarm, Sample, Timer, Batch Control, or Stopwatch
- Stopwatch & Timer Functions to Drive Relays & Open Collectors
- Optional Isolated 4-20 mA Analog Output
- Display Relay Runtime & Cycle Count via Relay Info Menu
- Free PC-Based MeterView XL USB Programming Software
- HART® Protocol Transparent
- Enable and Disable Backlight from Menu
- Operating Temperature Range: -40 to 75°C (-40 to 167°F)
- Installation Temperature Range: -55 to 75°C (-67 to 167°F)
- Conformal Coated PCBs for Dust & Humidity Protection
- Password Protection
- UL Listed as Explosion-Proof / Dust Ignition-Proof / Flame-Proof
- CSA Certified as Explosion-Proof / Dust Ignition-Proof / Flame-Proof
- ATEX and IECEx Certified as Intrinsically Safe / Explosion-Proof
- Flange for Wall or Pipe Mounting; Loop for Stainless Steel Tag; Holes for Tamper-Proof Seal
- Explosion-Proof Aluminum & Stainless Steel Enclosures with ¾" or M20 Connections
- 3-Year Warranty
Why Use Loop-Powered Meters?
The most basic decision a user wishing to display a 4-20 mA signal on a digital display has to make is: should the meter be powered by line voltage or should it be powered by the 4-20 mA loop?
There are three main benefits of using loop-powered devices:
- No additional power required
- Easy wiring
- Additional digital displays can easily be added in the same loop
The following diagram illustrates how a loop-powered meter is wired. Notice there are only two connections made to the meter.
For more information on loop-powered meters, check out Fundamentals of Loop-Powered Devices and Loop-Powered vs Line-Powered Meters white papers.
Overview
Hazardous Area Loop-Powered Flow Rate/Totalizers with Advanced Display and Control Features
The ProtEX+ loop-powered explosion-proof & intrinsically safe flow rate/totalizer can be installed virtually anywhere to provide convenient and informative display of any 4-20 mA signal. They can operate down to -40°C and be installed in areas that get as cold as -55°C, however the display will cease functioning. One of the most convenient features is the dual-line display, typically used to display the flow rate on the 5-character alphanumeric top display and flow total, flow grand total, or tag on the 8-character alphanumeric bottom display. The top display uses 12-segment, and the bottom display uses 14-segment alphanumeric characters for clear indication of tags, units, or alarm messages. Further enhancing the display on these instruments is a 20-segment bargraph.
The ProtEX+ carries all major approvals including:
- UL Listed as Explosion-Proof / Dust Ignition-Proof / Flame-Proof
- CSA Certified as Explosion-Proof / Dust Ignition-Proof / Flame-Proof
- ATEX and IECEx Certified as Intrinsically Safe / Explosion-Proof
Four CapTouch through-glass buttons are available to operate the instrument without removing the cover. The CapTouch buttons have two modes of operation: Normal and Delayed, and they can be disabled for security via a switch on the display module.
All models come equipped with two open collector outputs and a digital input. There are also models available with two solid-state relays and isolated 4-20 mA analog output options. The open collector outputs are useful for alarm indication or pulse output. The digital input can be used to remotely reset the total, to start/stop a timer/stopwatch, and more. The relays can be programmed for alarm indication, sample, timer, batch control, or stopwatch.
Free, PC-based, MeterView XL software that connects to the meter via a micro USB cable is available for programming and setup of the meters. This software greatly simplifies the programming process and also allows the user to save configuration files for later use. The meter will also be powered by the USB connection so no additional power is needed during programming.
For safe area versions of these instruments please click here.
Front
![PD6928-HA in Aluminum](/sites/default/files/images/products/PD6928HA/PD6928-HA-AL_Front.png)
- Flow Rate/Totalizer
- Aluminum
![PD6928-HA in Stainless Steel](/sites/default/files/images/products/PD6928HA/PD6928-HA-SS_Front.png)
- Flow Rate/Totalizer
- Stainless Steel
Connections
- (2) Open Collector Outputs Standard (150 mA max); Assignable to Pulse, Alarm, Timer, or Stopwatch
- Digital Input for Remote Operation of a Single Task
- (2) Loop-Powered Solid-State Relays; Assignable to Alarm, Control, Timer, or Stopwatch
- Isolated 4-20 mA Analog Output
Display Features
PD6928 Flow Rate/Totalizer with Bargraph
Display Flow Rate & Total at the Same Time
One of the key features of these rate/totalizers is their ability to display flow rate and total at the same time. In addition, the meter can toggle between the rate and total and their corresponding units. The following shows flow rate on the top display and the total flow on the bottom display, both display toggling between values and units.
![Display Flow Rate and Total Simultaneously](/sites/default/files/images/products/PD6928HA/6928_flow_rate_and_total_with_units.gif)
Wide Variety of Display Capabilities
In addition to the most common setup of flow rate on the top display and flow total on the bottom display, these meters can be set up for a variety of display configurations as shown in the following examples.
See the instruction manual for additional display possibilities for both top and bottom display.
![Flow Rate and Toggle Between Units and Tag](/sites/default/files/images/products/PD6928HA/6928_rate_display.gif)
Display flow rate on top, toggle between rate units and tag on bottom
![Flow Total and Toggle Between Units and Tag](/sites/default/files/images/products/PD6928HA/6928_total_display.gif)
Display flow total on top, toggle between total units and tag on bottom
![Flow Total and Flow Grand Total and Toggle Between Units](/sites/default/files/images/products/PD6928HA/6928_total_grandtotal_display.gif)
Display total flow on top and Grand Total flow on bottom, and display toggles between values and units. Notice Grand Total can use different units than Total.
2X More Informative Display
The PD6928 Series display offers a 50% larger display area and is twice more informative than previous generations of loop-powered meters. Featuring an alphanumeric dual-line display and a 20-segment bargraph, reading and understanding process values is easy and intuitive. The addition of status indicators provides a quick glance at alarm conditions, relays, process trends, and more. Predefined display units give users even more display flexibility.
![PD6928 Display All Indicators](/sites/default/files/images/products/PD6928HA/6928_Faceplate_All_Indicators.png)
Indicator | State | Description |
Steady | Process trend arrows | |
Flashing | Alarm indicator | |
Steady | Password protected | |
Steady | Solid-state relay 1 | |
Steady | Solid-state relay 2 | |
Flashing | CapTouch buttons self-calibrating (wait) | |
Steady | PV Bargraph | |
Flashing | Alarm condition: Bargraph segment flashes on alarm | |
Steady | Displaying Total | |
Steady | Displaying Grand Total | |
Steady | Batch is running | |
Flashing | Automatic batch control: Batch paused or start delayed | |
Steady | Batch is stopped | |
Steady | Batch is paused |
![Commas on bottom display](/sites/default/files/images/products/PD6928HA/6928_commas.png)
Commas Make it Easy to Read Big Numbers
The bottom display is set to show a comma separating the thousands and millions place by default if a numeric value is being displayed. This feature can be disabled or enabled using the Comma menu.
![13-Digit Total Enabled](/sites/default/files/images/products/PD6928HA/6928_13-digit_total.png)
Using 13 Digits to Display Total
The top and bottom displays can be setup to display a 13-digit total (9,999,999,999,999). The total will roll over to zero when it exceeds the limit.
Red, Flashing Display When Alarms Occur
When an alarm occurs, the display can be programmed to turn red, flash, and display an alarm indicator .
In addition, a unique custom alarm message for each of the two relays and two open collectors can be displayed on the bottom display. These features can be activated even if no relay or open collector is connected.
![Red, flashing display](/sites/default/files/images/products/PD6928HA/6928_red_flashing_backlight.gif)
![Meter with Red Backlight](/sites/default/files/images/products/PD6928HA/6928_red_backlight.png)
Backlight Turns Red on Alarm
The loop-powered backlight is standard on all ProtEX+ meters. It provides optimum visibility in any lighting condition and it can be programmed to turn red for alarm conditions. The backlight may be enabled or disabled using the Backlight menu. The backlight is enabled by default (input must be wired appropriately for the loop-powered backlight to function).
![Meter with Bargraph](/sites/default/files/images/products/PD6928HA/6928_bargraph.png)
Bargraph Provides Quick Understanding
The 20-segment bargraph helps users get a quick understanding of where their process is at. The bargraph can be programmed to represent either rate, a percentage of the rate, total, or it can be disabled.
![Dual Scale Feature](/sites/default/files/images/products/PD6928HA/6928_dual_scale.gif)
Dual-Scale Display Feature
Users can use the dual-scale feature when they want to show the same input in two different scales. For instance, the example above shows an application where the meter displays the input in gallons per minute and cubic feet per minute.
![14-segment Characters Comparison](/sites/default/files/images/products/PD6900HA/14SegmentCharactersComparison-2.png)
14-Segment Characters
Notice how much better letters like “T”, “N” and “K” appear as 14-segment characters on the bottom display vs. 7-segment characters found on other meters.
Max/Min Display
The max & min readings (peak & valley) reached by the process can be displayed either continuously or momentarily.
- Display momentarily by pressing the F1 function key (default) or assigning to any of the other function keys or to the digital input in the User menu. Press Enter to lock/unlock max/min display.
- Display continuously by assigning either display line to max/min through the Display menu.
Any of the F1-F3 function keys (buttons) and the digital input can be programmed to reset the max & min readings.
![Max/Min Display Toggling](/sites/default/files/images/products/PD6900HA/6908_max_min_display.gif)
Predefined and Custom Units
The meter has the most common predefined rate and volume units. If the desired unit is not available, the user can program a custom unit.
Total & Rate in Different Units
The user can select to display total in different units than the rate. For instance, a customer could measure flow rate in gallons per minute and total in acre-feet by simply selecting AF (acre-feet) units for the total. Additionally the user can enter a custom unit and conversion factor to display the total in any unit of measure.
CapTouch Through-Window Buttons
All PD6928 meters are equipped with four capacitive sensors that operate as through-window buttons so that they can be operated without removing the cover (and exposing the electronics) in a hazardous area.
CapTouch buttons are designed to work under any lighting condition and to protect against false triggering. They can be turned off for security via a switch on the display module
To actuate a button, press one finger to the window directly over the marked button area. When the cover is removed, the CapTouch buttons can be used after the meter completes a self-calibrating routine ( flashes). The sensors are disabled when more than one button is pressed, and they will automatically re-enable after a few seconds ( off).
CapTouch Key Features
Capacitive touch technology
More reliable & responsive
Two modes of operation
Operate meter without removing the cover
CapTouch Buttons Operation Modes
The CapTouch buttons have two modes of operation: Normal and Delayed.
NormalNormal is the factory default setting. This mode is recommended for programming the meter or when immediate operation of the buttons is needed.
DelayedUse the Delayed mode to prevent accidental trigger of the buttons. In the Delayed mode, the buttons enter into a low sensitivity state (sleep) and they ignore quick button presses after 20 seconds of inactivity. To wake up the buttons, press and hold any button for more than 2 seconds, the buttons respond normally.
Turning Off CapTouch Buttons
The CapTouch buttons can be turned off for security by moving the slide switch located on the display module to the Off position.
![Switch to Disable CapTouch Buttons](/sites/default/files/images/products/PD6900HA/CapTouchSwitchAndLabel.png)
Outputs
PD6928 meters come with two open collector outputs as standard and two solid-state relays and 4-20 mA output as options. The open collector outputs and relays generally operate in the same manner, with the major exception being the open collectors are not available for batch control and the relays are not available with pulse output features. The open collectors and relays can be controlled either automatically or manually. The alarm status (with a unique flashing red message for each of the two relays and open collectors) will show on the display even with no output wired.
Two Open Collector Outputs
The meter is equipped with two NPN open collector outputs that may be set up for pulse outputs, alarms, timed pulses, stopwatch on/off, or disabled. Pulse outputs can be set to transmit the rate, total or grand total. Output 2 may be used to generate a quadrature output based on the other open collector output. An output test mode is also selectable to generate pulses at a constant programmable frequency. The open collectors are commonly used to generate a pulse for every user-defined amount of flow that has been generated. For instance, the meter can be programmed to generate a pulse for every 100 gallons of flow.
Two Optional Solid-State Relays
The meter is optionally equipped with two solid-state relays that may be set up for alarms, sample, timer, batch control, or stopwatch. The relays are rated at 250 VAC/DC @ 0.5 A for resistive loads and 38 VA @ 0.3 A, 250 VAC/DC max (Safe Area only) for inductive loads. Alarms are available based on the PV value or the digital input.
Optional Isolated 4-20 mA Output
The isolated analog output signal can be configured to represent the rate, total or to retransmit the 4-20 mA input signal without the need to scale the output. While the output is nominally 4-20 mA, the signal will accurately accommodate under- and over-ranges from 1 to 23 mA. The output can be reverse scaled such that the meter’s high calibration value outputs 4 mA and the meter’s low calibration outputs 20 mA.
Loop-Powered Relay Alarm Trip
The two solid-state relays can be used as a loop-powered relay alarm trip. The meter’s two relays can be programmed for two different kinds of latching operation: Reset via momentary contact closure at any time or reset via momentary contact closure only after the alarm has cleared. And the meter’s display can be programmed to turn red and flash a unique custom alarm message for each relay – something not found on most loop-powered alarm trips.
Resetting the Open Collectors and Relays
The open collectors and relays (alarms) may be programmed to reset in the following ways:
- Automatic (AUTO): Alarm will reset automatically once the alarm condition has cleared.
- Automatic/Manual (AUTO.MAN): Alarm will reset automatically once the alarm condition has cleared but can also be reset using the Enter button (or whichever function key is set to acknowledge) at any time.
- Latching (LATCH): Alarm must be reset manually and can be done so at any time. Press the Enter (ACK) button at any time to clear the alarm.
- Latching with Reset after Cleared (L-CLEAR): Alarm must be reset manually and can only be done so after the alarm condition has cleared. Press the Enter (ACK) button after the alarm condition has cleared to reset the alarm.
Sampling Relay
A relay set to sample will trigger when the total or grand total value has incremented by a programmed amount. The relay can be programmed to stay on for a specified amount of time. For example: if a relay is set to sample the total with a COUNT of 1,000 and a TIME of 10 seconds, the relay will energize for 10 seconds each time the total increments by 1,000 (e.g. 1000, 2000, 3000).
Timer Function
Timers are used in everyday life; one of the most common examples is the microwave oven. Industrial timers are used in process control applications where certain events or actions need to be controlled by time. Examples include automatic batch control applications, where the relay needs to be energized for a specific length of time.
The timer fuction is available on the open collector and relay outputs; which means that you can have up to four timers per meter. The start and stop actions can be triggered from the setup menu or by the function keys and digital input. The meter can be setup to display the off/on timer count down.
There are two modes of operation:
- Continuous Timer (Interval)
At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The cycle repeats until the user stops the timer either from the menu or a function key. - One-Shot Timer
At the start of the timer the output is off and turns on after the Off Delay elapses. The output remains on for the duration of the On Time. The timer stops and the cycle does not repeat.
![Bottle Filling Application Timer](/sites/default/files/images/products/PD6600/TimerFunction.png)
- A sensor detects the bottle is in place and triggers the digital input to start the timer
- The timer output controls the filling pump
- The On Time is set according to the time needed to fill the bottle
Batch Control
The PD6928, when ordered with the two solid-state relays, can be used as a simple, one or two-stage batch controller. The user enters a preset and preclose value and sets the meter to either count up or count down. The top display will show the total and the bottom display will show the preset batch amount. The function keys are automatically changed so that F1 starts a batch, F2 opens the preset menu to allow the preset value to be changed, and F3 pauses/stops the currently running batch. Batching can be either automatic or manual.
Batch Control Operation Example
The following example shows how two-stage manual batch control functions with a PD6928. This setup will establish a 55-gallon preset for the batch, with a main valve (high flow) that will close at 50 gallons, and a trickle valve (low or restricted flow) that will close at 55 gallons. Because the first batch overruns by 0.10, the batch preset will be changed to 54.90 for the next batch to compensate for overrun.
If only one-stage batch control is desired, do not assign relay 2 to batch. The following pages show illustrations of how the above settings control the batch operation. The display assignment shown is the default.
Parameter | Setting | Function |
RELAY OUTPUT 1 | RLY 1 BATCH | Press Enter to assign relay 1 batch parameters. |
BATCH COUNT | UP or DOWN | Setup batch to count up or down. |
BATCH MAXIMUM | 100.00 GAL | This setting prevents the operator from entering a preset value that exceeds a safety limit for the batch process. |
BATCH MODE | MANUAL or AUTO | Press Enter to select manual or automatic batch control. |
BATCH PRESET | 55.00 GAL | Enter the batch size. |
BATCH DELAY | ON & OFF | Enter the On & Off time delays for relay 1, if desired. |
Parameter | Setting | Function |
RELAY OUTPUT 2 | RLY 2 BATCH | Press Enter to assign relay 2 batch parameters. |
BATCH PRECLOSE | YES PRECLOSE 5.00 | Set the pre-close value to 5 to close the valve being controlled by relay 2 so it closes five gallons before reaching the preset. |
BATCH DELAY | ON & OFF | Enter the On & Off time delays for relay 2, if desired. |
RELAY MESSAGE | MSG RELAY 1 | Enter a message to be displayed while relay 1 is on, if desired. |
MSG RELAY 2 | Enter a message to be displayed while relay 2 is on, if desired. |
Manual Batch Control
The manual batch control feature is used for batch processes that the operator wants to start manually. It can also be used where the batch size needs to be manually adjusted for each batch. The batch can be controlled by the button on the meter or the digital input.
![Batch System Setup](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-1.png)
System Setup
Both valves are closed with an empty barrel in place. The batched total is displayed in the upper display, the preset is selected for the lower display.
![Batch Start](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-2.png)
Batch Start
The START button or (F1) is pressed. Both valves open. The barrel begins to fill.
![Preclose Valve](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-3.png)
Preclose Valve
When the batch total reaches a value of 50.00 (Preset [55.00] – Pre-close [5.00]) the full-flow valve closes. The fill rate of the tank slows as a result.
![Completed Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-4.png)
Completed Batch
When the batch is complete, the restricted flow valve closes. If overrun occurs, then the preset must be adjusted to compensate for the overrun amount. The next batch will only start after the START button or (F1) is pressed.
![Overrun Correction](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-5.png)
Overrun Correction
To compensate for overrun in the previous batch, adjust the preset to 54.90, so that the next batch is accurate (55.00).
![Manual Start of Next Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-6.png)
Manual Start of Next Batch
A new, empty, barrel is put in place and the START button or (F1) is pushed to manually start the next batch.
![Change Batch Size](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-7.png)
Change Batch Size
While the process is stopped, a new preset fill amount may be selected with the Batch key (F2) for a different size barrel.
![Pause/Stop](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-8.png)
Pause/Stop
At any time, press the STOP button or Stop key (F3) once to pause the process, or twice to cancel the batch, which stops the process.
![Resume Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-9.png)
Resume Batch
If the batch has been paused, then press START button or (F1) to resume the batch process.
Automatic Batch Control
The automatic batch control feature is used for batches that start automatically once the previous batch is completed. There is no opportunity for the operator to change the batch size between batches. The batch can be controlled by the button on the meter or the digital input.
![Batch System Setup](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-1.png)
System Setup
Both valves are closed with an empty barrel in place. The batched total is displayed in the upper display, the preset is selected for the lower display.
![Batch Start](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-2.png)
Batch Start
The START button or (F1) is pressed. Both valves open. The barrel begins to fill.
Preclose Valve
When the batch total reaches a value of 50.00 (Preset [55.00] – Pre-close [5.00]) the full-flow valve closes. The fill rate of the tank slows as a result.
![Completed Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-4A-B.png)
Completed Batch
When the batch is complete, the restricted flow valve closes. If overrun occurs, then the preset must be adjusted to compensate for the overrun amount.
![Start Delay](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-5A-B.png)
Start Delay
After the batch is completed, the operator removes the full barrel and places an empty barrel; the new batch starts automatically after 60 seconds (Time Delay).
![Automatic Start of Next Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-6A.png)
Automatic Start of Next Batch
The next batch begins automatically after 60 seconds, both relays activate and both valves open.
![Pause](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-7A.png)
Pause
At any time, press the STOP button or Stop key (F3) once to pause the process.
![Resume Batch](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-8A.png)
Resume Batch
If the batch has been paused, then press START button or (F1) to resume the batch process.
![Stop Process](/sites/default/files/images/products/PD6928HA/BatchControl/batch-control-9A.png)
Stop Process
At the end of the shift, press STOP button or Stop key (F3) twice to stop the batch process.
Totalizer Capabilities
PD6928 flow rate/totalizers can be programmed for a wide variety of totalizer applications. They can display total, grand total, or non-resettable grand total; the rate can be displayed with a time base of seconds, minutes, hours or days. The user can program a totalizer conversion factor, a non-resettable grand total, password protection, and several total reset methods.
8-Digit Total & Grand Total Display, Up to 13 Digits Using Both Lines
The flow rate/totalizer can be programmed to show eight full digits of total on the bottom display or 13 digits of total using both the top and bottom displays. In both cases, the display can be programmed to include commas to make it easier to read the very large numbers; ie 44,987,356.
In 13-digit mode, the bottom line shows the least significant digits and the top line shows the most significant digits. The meter is not capable of displaying commas on the top line, so this number is actually 1,211,230,379. The commas can be removed from bottom if desired. See sample on bottom, right.
![8 Digits of Total on Bottom Display](/sites/default/files/images/products/PD6928HA/6928_total_bottom.png)
![13-Digit Total](/sites/default/files/images/products/PD6928HA/6928_total_13-digit.png)
Totalizer Conversion Factor & Multiplier
The user can enter a totalizer conversion factor that allows the meter to display total in different units than the rate. For instance, a customer could measure flow rate in gallons per minute and total in millions of gallons. A multiplier may be selected to automatically display the value in kGAL, MGAL, etc. Use the custom units to display the total in any unit of measure including units in languages other than English.
Total Alarms
The two open collectors and the two relays can be set up to alarm when the total reaches a user-defined set point. A variety of reset modes are available and the user can also program time delays and fail-safe operation.
Totalizer Password Protection
The total and grand total can be password protected so they can be reset only by authorized personnel.
Total Stored in Non-Volatile Memory
Total and grand total values, and all programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Front Panel Total Reset
The three front panel function keys can be programmed to reset the total and grand total. This makes it possible for the user to reset either the total or the grand total by pressing the appropriate function key. Of course, if the total or grand total is password protected, they will not reset when the function key is pressed unless the password is entered.
![Total Reset via Function F2 Key](/sites/default/files/images/products/PD6928HA/Total_Reset.png)
Non-Resettable Grand Total
The user can set up the grand total to be non-resettable by selecting YES for PERMLOCK in the Advanced - Grand Total - Reset menu. Once this is done, the grand total can never be reset.
Low-Flow Cutoff
The user may program the meter for a low-flow cutoff such that the meter displays zero below this point, regardless of the input value.
Input Signal Conditioning
To satisfy applications that require scaling in ways other than the usual 2-point linear method, the PD6928 can also be scaled for square root (differential pressure flow), or programmable exponent (open channel flow).
For existing processes that require these linearization capabilities, one of the great benefits of loop-powered meters is that they get their power directly from the 4-20 mA loop and thus require no additional wiring. All a user has to do is break the existing loop and wire in the meter. For this reason, loop-powered meters are very easy to add to existing applications such differential pressure or open channel flow.
Differential Pressure Flow
The PD6928 can display flow rate and total 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.
![Differential Pressure Flow](/sites/default/files/images/products/PD6928HA/6928SquareRootLinearization.png)
Multi-Point Linearization
Meters are set up at the factory for linear function with 2-point linearization. Up to 32 linearization points can be selected for rate under the linear function. Multi-point linearization can be used to linearize the input for non-linear signals to convert level to flow using weirs and flumes with complex equations.
MeterView XL software makes it easy to program up to 32 points.
Open Channel Flow
The PD6928, in combination with an ultrasonic level transmitter, makes for an economical way to measure and display open channel flow rate in most weirs and flumes. A guide such as the ISCO Open Channel Flow Measurement Handbook can provide the user with all the information needed: the exponent used in the flow equation for the desired flow units and the flow rate for any given head height. For example, to display the open channel flow rate from a 3" Parshall flume, the ISCO handbook advises the exponent is 1.547 and at the maximum head height of 3.0 feet, the flow rate is 3.508 MGD.
![Open Channel Flow](/sites/default/files/images/products/PD6928HA/6928OpenChannelFlow.png)
Function | Desire | Programming |
Open Channel Flow | 3" Parshall flume | Set Programmable Exponent to 1.547 |
Flow Ratew | Millions of Gallons per Day (MGD) | Set 4 mA = 0 & 20 mA = 3.508 Time base = Day |
Total | Millions of Gallons | Set Totalizer Conversion Factor = 1 (password protect total reset) |
Non-Resettable grand total | Program meter so grand total can never be reset | Set non-resettable grand total |
Display | Display Flow Rate and Total at the same time | Set upper display for Grand Total and lower display to toggle between rate and total. |
Sampling | Take a 1 pint sample every 100,000 gallons | Set up relay for sampling and to trip every 0.1 million gallons. Set up sampling time such that 1 pint is sampled. |
Physical Features
ProtEX+ Aluminum & Stainless Steel Enclosures
![ProtEX+ Physical Features Overview](/sites/default/files/images/products/PD6928HA/6928_physical_features.png)
![NEMA 4X / IP68 Rated Enclosure](/sites/default/files/images/products/PD6928HA/NEMA_4X_ex_proof_enclosure.jpg)
NEMA 4X Enclosure
The ProtEX+ enclosure provides serious protection from the elements, high impact, corrosion, and dust. It is NEMA 4X/IP68 rated. In addition, the ProtEX+ enclosure provides protection against electrical interference and its extensive worldwide agency approvals allow it to be installed virtually anywhere.
![PD6900 Mounted to a Pipe](/sites/default/files/images/products/PD6900HA/flange_for_pipe_mounting.jpg)
Easy Pipe Mounting
The ProtEX+ comes with a built-in flange. This allows easy mounting to walls or pipes using either a PDA6846 Zinc Plated Steel or a PDA6846-SS Stainless Steel 2" U-Bolt Kit. A slot on the back of the enclosure makes it easy to center the unit on a pipe.
![PD6900 Wide Angle Viewing](/sites/default/files/images/products/PD6928HA/wide_angle_viewing.jpg)
Wide Viewing Angle
The window and display module have been optimized to provide a wide viewing angle of approximately ±40°; nearly twice that of the competition.
![PD6900 with Tamper Seal](/sites/default/files/images/products/PD6900HA/tamper_proof_protection.jpg)
Tamper-Proof Capability
The instrument can be made tamper-proof by inserting a wire through the built-in loop on the base of the enclosure and a hole in the lid of the enclosure and securing this wire with a lead seal.
![PD6900 Rotatable Display Module](/sites/default/files/images/products/PD6928HA/rotatable_display_module.jpg)
Rotatable Display Module
The display module can be rotated in 90° increments providing added mounting flexibility. Plus the various conduit connections allow a variety of installation options.
![PD6900 with Stainless Steel Tag Attached](/sites/default/files/images/products/PD6928HA/stainless_steel_tag_loop.jpg)
Stainless Steel Tag Attaching Loop
The enclosure is equipped with a loop at the top to easily attach a PDA-SSTAG stainless steel tag.
Easy Wiring & Service
The ProtEX+ has been designed for easy wiring and servicing. All connections are made to removable screw terminal blocks. There are no exposed printed circuit boards. The display module snaps into the built-in rails on the enclosure ensuring a secure and perfect fit every time. No tools are needed to install or remove it. The options module is screwed into the base of the enclosure. Both modules completely encase the printed circuit boards.
![PD6900 Options Board and Display Module](/sites/default/files/images/products/PD6900HA/options_board_connected_to_display_module.jpg)
![PD6900 Easy Wiring and Service](/sites/default/files/images/products/PD6900HA/easy_wiring_and_service.gif)
![USB Port on Display Module](/sites/default/files/images/products/PD6900HA/USB_connection.jpg)
USB Port for Easy Connection to Free MeterView XL Software
A USB port located on the display module allows it to be connected to a PC for use with free MeterView XL software. The meter is powered by the USB connection during programming, if a 4-20 mA loop is not connected.
![Conduit Opening](/sites/default/files/images/products/PD6900HA/conduit_openings.jpg)
Two Threaded Conduit Openings
The ProtEX+ comes with two ¾" NPT threaded conduit openings as standard. It also available with M20 conduit openings as an option.
Conduit plugs available that are sold separately include the PDAPLUG75 3/4" NPT 316 stainless steel conduit plug with approvals and the PDAPLUGM20 M20 316 stainless steel conduit plug with approvals for models with M20 conduit openings.
Operational Features
There are two ways the user can interact with the ProtEX+ to perform a variety of useful functions: programmable function keys and the digital input.
Programmable Function Keys
The three CapTouch buttons labeled F1, F2, and F3 can be programmed as function keys to perform a variety of meter functions simply by pressing on the window over the button. These include resetting the total, operating the batch control functions, resetting the meter’s relays or open collectors, starting and stopping timers, and displaying max/min values. The default settings for the function keys are:
Button | Description (Default Settings) |
Press to display grand total. Continue pressing to cycle through max, min, rate, and total displays. | |
Press to access the Reset menu. Press F1 to scroll through the options. Press F3 to reset the currently displayed parameter. | |
Press to acknowledge all manually resettable relays or open collectors. Press to lock/unlock the display value after pressing the F1 key. |
On-Board Digital Input
A digital input is standard on ProtEX+ meters. This digital input is programmed identically to the function keys. The input is triggered with a contact closure between DI+ and DI-, or with an active low signal. For a complete list of Digital Input settings available, see Function Keys & Digital Input Available Settings in the instruction manual.