OVERVIEW
The ProtEX-RT PD6820 is a rugged, explosion-proof loop-powered rate/totalizer fully featured for demanding applications in hazardous areas or in the harshest environmental conditions. Users need a display to provide important process information and the display on a transmitter is often too small and mounted in a hard to see area. The PD6820's display is designed to be big, bright and easy to read from a wide variety of angles. It is programmed using four SafeTouch™ through-glass buttons without removing the cover, and can be scaled with or without a calibration signal. The lower alpha-numeric display can be programmed to show any combination of numbers and letters up to seven characters long for use as engineering units and/or the process identification tag. The bright white backlight helps you see the display under any lighting condition
KEY FEATURES
User Friendly Display
The high contrast 0.7" high 5-digit LCD on the upper display is easy to read. The 0.4" 7-character lower display is alpha-numeric and allows for more sensible looking tags, engineering units, or legends than a 7-segment display. For dark areas, the backlight (standard) can be illuminated either with loop power, or an external 9 to 30 VDC.
Through-Glass SafeTouch™ Buttons
 The PD6820 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 LOCK setting on the switch located on the connector board in the base of the enclosure. To actuate a button, press one finger to the glass directly over the marked button area. When the cover is removed, four mechanical buttons located next to the sensors are used.
Exceptional Enclosure
Wide Viewing Angle
The copper-free (0.3%), smooth die-cast aluminum NEMA 4X enclosure is finished with a corrosion resistant epoxy coating. This provides a durable finish, and helps make it an attractive looking enclosure. The built-in mounting flanges are convenient for wall or pipe mounting (up to 2½" pipes). The enclosure is provided with two ¾" NPT threaded conduit holes. The window and display module on the PD6820 enclosure have been optimized to provide a wide viewing angle of approximately +/- 40°, nearly twice the competition! This makes it even easier for operators to see the display.
Isolated Open Collector Output
The isolated OC output on the PD6820 may be assigned for use with the alarm or totalizer (pulse output). The rating of the output is 30 VDC @ 150 mA max.
Alarm
The PD6820 can be configured to have a high or low rate alarm indicator, or a total alarm trip point indicator. The OC output is available for use as an alarm output. When in alarm mode, the display will flash, and a HI or LO symbol is displayed. The alarm has an adjustable deadband and is acknowledged by pressing the ENTER/ACK button.
Totalizer Pulse Output
The totalizer pulse output function requires use of the OC output. It will output a pulse at a user adjustable pulse rate, and can be scaled with a K-factor of between 0.0001 and 99999. Example: For 1 pulse every 500 gallons, set the K-factor to 500. This output can be sent to a PLC or counter.
Totalizer Conversion Factor
Total Conversion Factor is used to convert to a different unit of measure for the total display. For example, to display rate in gallons and total in liters, enter a conversion factor of 3.7854. When rate and total units are the same, the Conversion Factor should be 1.0000.
Password Protection
A 5-digit password prevents unauthorized changes to the programmed parameter settings. The lock symbol is displayed to show that settings are protected. If the meter is password protected, the meter will display the message LOCKED when the Menu button is pressed.
Design Simplicity
The internal cast rails within the enclosure replace fragile stand-offs. They also guide and mount the internal module. Two spring-loaded thumbscrews make the assembly a snap, while pressing the LCD as close as possible to the glass window to help with wide-angle viewing.
MATH FUNCTIONS
There are three available math functions on the PD6820. Those are: linearization, square root, and programmable exponent. The square root function is primarily for differential pressure (flow), and the programmable exponent is for open channel flow (weirs and flumes).
Two-Point Linearizer
The PD6820 has a linearizer which can be assigned to any two points within the input function range for best fit. The scale will follow the linearization slope to the limits of the analog input, or to its full 4-20 mA input capability. The user can also scale the meter to have an inverse relationship to the input.
Square Root Extraction
The square root extraction function displays flow rate by extracting the square root from a differential pressure transmitter signal. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value.
• Displays Flow Rate
• User Selectable Low-Flow Cutoff
• Only 2 Calibration Points Required
Programmable Exponent
The programmable exponent function is used to linearize the level signal in open channel flow applications using weirs and flumes and display flow rate & total, units of measure, or toggle between total and units of measure.
INSTALLATION
Installation Flexibility
The PD6820's rotatable display/meter module along with two available conduit connections provide for numerous installation options. The display can be rotated in 90° increments. Rotate it 90° for horizontal mounting. Wiring can then be routed to either the top conduit connection, or from below to the opposite conduit connection (metal conduit plug supplied). Use both conduit connections for through-wiring in any plane.
Easy Wiring & Service
Unscrew the two captured thumb screws and unplug a connecting cable and the display/meter module is simply and completely removed. A heavy duty terminal block is then easily accessed and wired. It is clearly marked to prevent wiring errors. The display/meter module can be removed without breaking the loop. As such, it can be serviced without the need to uninstall the entire product.
CONNECTIONS
SPECIFICATIONS
Except where noted all specifications apply to operation at +25°C.
General
Display: Upper: Five digits (-9999 to 99999) 0.70" (17.8 mm) high, 7-segment, automatic lead zero blanking. Lower: Seven characters 0.4" (10.2 mm) high, 14 segment alpha-numeric. Symbols: for high & low alarm, password lock. Backlight: white
Display Update Rate: Ambient > -25°C: 2 Updates/Second. Ambient < -25°C: 1 Update/5 Seconds
Overrange: Display flashes 99999
Underrange: Display flashes -9999
Programming Method: Four SafeTouch™ through-glass buttons when cover is installed. Four internal pushbuttons when cover is removed.
Noise Filter: Programmable Lo, Med, Hi, or Off
Recalibration: Recalibration is recommended at least every 12 months.
Max/Min Display: Max/Min readings reached by the process are stored until reset by the user or until power to the meter is turned off.
Password: Programmable password restricts modification of programmed settings.
Math Functions: Linear, square root, or programmable exponent
Non-Volatile Memory: All programmed settings are stored in non-volatile memory for a minimum of ten years if power is lost.
Normal Mode Rejection: 64 dB at 50/60 Hz
Operating Temperature Range: -40 to 75°C.
Storage Temperature Range: -40 to 85°C.
Relative Humidity: 0 to 90% non-condensing
Connections: Screw terminals accept 12 to 22 AWG wire
Enclosure: Explosion-proof die-cast aluminum with glass window, corrosion resistant epoxy coating, color: blue. NEMA 4X, 7, & 9, IP68. Copper-free (0.3%). Two ¾" NPT threaded conduit openings. One ¾" NPT metal conduit plug with 12 mm hex key fitting installed.
Mounting: May be mounted directly to conduit. Two slotted flanges for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm pipe mounting.
Overall Dimensions: 5.65" x 5.25" x 4.86" (W x H x D) (144 mm x 133 mm x 124 mm)
Weight: 5.00 lbs (80 oz, 2.27 kg)
Warranty: 3 years parts and labor
Input
Input range: 4-20 mA
Accuracy: ±0.03% of calibrated span ±1 count, square root & programmable exponent accuracy range: 10-100% of calibrated span.
Temperature Drift: 50 PPM/°C
Decimal Point: User selectable decimal point
Calibration Range: An error message will appear if input 1 and input 2 signals are too close together.
Maximum Voltage Drop: 3.0 VDC @ 20 mA without loop-powered backlight. 6.0 VDC @ 20 mA with loop-powered backlight
Equivalent Resistance: 150 Ω @ 20 mA without loop-powered backlight. 300 Ω @ 20 mA with loop-powered backlight
Input Overload: Over current protection to 2 A max.
Externally Powered Backlight:
| Voltage Range |
Maximum Power |
| 9-30 VDC |
9 VDC |
12 VDC |
24 VDC |
30 VDC |
| |
0.2 W |
0.25 W |
0.5 W |
0.75 W |
Open Collector Output
Rating: Isolated open collector, 30 VDC @ 150 mA max.
Alarm Output: Assign as rate alarm or total alarm trip point.
Deadband: 0-100% FS, user selectable
Acknowledge: Front panel ACK button resets output and screen indication.
Pulse Output K-Factor: K-factor programmable from 0.0001 to 99999.
Pulse Output Frequency: 2, 4, 8, 16, 32, 64, 128 Hz. Minimum pulse width: 3.9 ms @ 128 Hz. Maximum pulse width: 250 ms @ 2 Hz. Factory default pulse width: 31 ms @ 16 Hz
Rate/Totalizer
Rate Display: 0 to 99,999 leading zero blanking
Total Display: 0 to 9,999,999 leading zero blanking
Total Decimal Point: Up to six decimal places or none: d.dddddd, d.ddddd, d.dddd d.ddd, d.dd, d.d, or ddddddd
Lower Display Configuration: Can be programmed to display total, tag name/engineering units, or to alternate between them.
Totalizer: Calculates total based on rate, time base of second, minute, hour, or day, and field programmable multiplier; stored in non-volatile memory upon power loss.
Totalizer Reset: Via front panel SafeTouch® button, time delay, external contact closure, or protected
Total Conversion Factor: 0.000001 to 9,999,999
Totalizer Rollover: Display rolls over when display exceeds 9,999,999. Relay status reflects the displayed value.
Total Reset Delay: Programmable from 0 to 99,999 seconds
Ratings & Approvals
FM & CSA: FM Approved & CSA Certified. Explosion-proof for use in Class I, Division 1, Groups B, C, and D; Dust-Ignition-proof for Class II, Division 1, Groups E, F, and G, Class III; hazardous (classified) locations,
USA: Indoor and outdoor (Type 4X and IP66); Ta = -40 to 185°F
FM Certificate: 3032880
Canada: Indoor and outdoor (Type 4X); Ta = -40 to 85°C
CSA Certificate: 2210414
ATEX & IECEX: ATEX Certified: Group 2, Category 1 (Zone 1), Gases, Vapors, Mists, or Dusts: II 2 G D, Ex d IIC Gb, Ex tb Db IIIC IP68.
Ta = -40 to 85°C. ATEX Certificate: Sira 08ATEX1325U
IECEx Certified: Flameproof, Gas Group IIC, Ex d IIC Gb, Ex tb IIIC IP68.
Ta = -40 to 85°C. IECEx Certificate: IECEx SIR 08.0126U
DIMENSIONS
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