Precision Digital Corporation PD6820 User manual

PRECISION DIGITAL CORPORATION
www.predig.com
• 4-20 mA Input Loop-Powered
• 5-Digit, 0.7" (17.8 mm) Upper Display
• 7 Alphanumeric Character, 0.4"(10.2 mm) Lower Display
• 7-Digit Totalizer
• Loop or External DC-Powered Backlight Standard
• SafeTouch™ Through-Glass Button Programming
• Password Protection
• HART®Protocol Transparent
• 3.0 V Drop without Backlight
• Explosion-Proof, IP68, NEMA 4X Enclosure
• Flanges for Wall or Pipe Mounting
• 32-Point , Square Root, or Exponential Linearization
• Rate in Units per Second, Minute, Hour, or Day
• Open Collector Pulse or Alarm Output
• Operates from -40 to 75°C
5-DIGIT DUAL-LINE EXPLOSION-PROOF
LOOP-POWERED RATE/TOTALIZER
TM
RT
ProtEX-RT • Model PD6820
OUCH
TM
Through-Glass
ButtonProgramming

2
ProtEX™PD6820 LOOP-POWERED RATE/TOTALIZER
TM
RT
0.4" high, 7 Characters
(Alphanumeric)
Rate/Process Variable
Up to 2½" Pipe
Mounting Flanges
Total, Engineering Units,
or Alternate Both
0.7" high, 5 Digits
SafeTouch™
Menu Button
SafeTouch™
Reset or Right Arrow
SafeTouch™
Enter or
Acknowledge Button
SafeTouch™
Max/Min or Up Arrow
Two ¾" NPT
Conduit Holes
Locking Screw
Ground Screw
Mechanical Buttons
(4 Places)
Password Protection
Alarm Indicator
Backlight Standard
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
displayto provide important processinformationand 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 alphanumeric
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 alphanumeric 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
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
viewingangle of approximately +/-40°,nearlytwice the competition!
This makes it even easier for operators to see the display.
OUCH
TM
Through-Glass
ButtonProgramming
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
[e-mail]6820manualforwiringinstructions.
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.
Wide Viewing Angle
Explosion-Proof
Die-Cast Aluminum
NEMA 4X Enclosure

3
ProtEX™PD6820 LOOP-POWERED RATE/TOTALIZER
CONNECTIONS
Backlight
Power Switch
Lock/Unlock
SafeTouch
Buttons Switch
External
Totalizer
Reset
Open
Collector
Output
SAFE-TOUCH
BUTTONS BACKLIGHT POWER
UNLOCK LOCK LOOP
9-30 VDC
+-+-
SIGNAL BACKLIGHT
+-+-
OUTPUT RESET
See LIM6820 manual for wiring instructions
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.
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.
Die-Cast Rails
(4) places
Internal View
ADVANCED FUNCTIONS
There are three available advanced 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).
Multi-Point Linearizer
Up to 32 linearization points can be selected under the Linear
function. The multi-point linearization can be used to linearize the
display for non-linear signals such as those from level transmitters
used to measure volume in odd-shaped tanks or to convert level
to flow using weirs and flumes that require a complex exponent.
These points are established via direct entry (SCALE) or with an
external calibration signal (CAL).
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.

ProtEX™PD6820 LOOP-POWERED RATE/TOTALIZER
www.predig.com
LDS6820_C 03/11
PRECISION DIGITAL CORPORATION
89 October Hill Rd • Holliston MA 01746 USA • Tel [phone] • Fax [phone]
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
Product Ratings & Approvals
FM: Explosion-proof for use in Class I, Division 1, Groups B, C, D. Class II,
Division 1, Groups E, F, G. Class III, Division 1; T6. Class I, Zone 1, AEx
d IIC T6 Gb. Zone 21, AEx tb IIIC T85°C. Ta = -40 to 75°C.
Enclosure: Type 4X & IP66. Certificate number: 3040391
ATEX: II 2 G D. Ex d IIC T6 Gb. Ex tb IIIC T85°C Db IP68.
Ta = -40 to 75°C. Certificate number: Sira 10ATEX1116X
IECEx: IECEx SIR 10.0056X. Ex d IIC T6 Gb. Ex tb IIIC T85°C Db IP68.
Ta = -40°C to +75°C
CSA: Class I, Division 1, Groups B, C, D. Class II, Division 1, Groups E,
F, G. Class III, Division 1; T6. Class I, Zone 1, Ex d IIC T6.
Ta = -40°C to +75°C Certificate number: 11 2325749
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 alphanumeric. 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.
Advanced 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. Input Range: 4-20 mA. Minimum Span
Input 1 & Input 2: 0.10 mA
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
ORDERING INFORMATION
ProtEX-RT PD6820 • Explosion-Proof Rate/Totalizer
Model Description
PD6820-0K0 Explosion-Proof Loop-Powered Rate/Totalizer
with Backlight
Your Local Distributor is:
Disclaimer
The information contained in this document is subject to change without notice. Precision Digital
Corporation makes no representations or warranties with respect to the contents hereof, and
specifically disclaims any implied warranties of merchantability or fitness for a particular purpose.
©2011 Precision Digital Corporation. All rights reserved.
DIMENSIONS
3.35 (85.0)
4.15 (105.5)
3.22 (81.9) 4.86
(123.5)
3
.
35
(85
.
1)
2.25 (57.1)
0.33
(8.4) 5.65
(143.5)
5.25 (133.4)
Units: Inch (mm)