Precision Digital Corporation PD6801-0K1-M20 User manual

PD6801 Explosion-Proof Loop-Powered
Feet & Inches Level Meter
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone] • [phone]
www.predig.com
TM
•Fully-Approved Explosion-Proof Loop-Powered Meter
•4-20 mA Input with ±0.03% Accuracy
•3.0 Volt Drop (6.0 Volt Drop with Backlight)
•Easy Field Scaling in Engineering Units without Applying an Input
•0.6" (15.2 mm) Feet & Inches Main Display With 1/8 or 1/16 Resolution
•0.4" (10.2 mm) 7 Alphanumeric Characters Secondary Display for Tag, Volume, or Percent
•Display Level in Feet & Inches and Volume, Percent or Decimal Height Simultaneously
•Display Mountable at 0°, 90°, 180°, & 270°
•SafeTouch Through-Glass Button Programming
•20-Segment Tank Side Level Indicator Bargraph
•Open Collector Output Assignable to High or Low Alarm
•HART®Protocol Transparent
•Loop or External DC-Powered Backlight Standard
•Operating Temperature Range: -40 to 75°C (-40 to 167°F)
•Installation Temperature Range: -55 to 75°C (-67 to 167°F)
•CSA Certified as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
•ATEX and IECEx Certified as Explosion-Proof
•Conformal Coated PCBs for Dust and Humidity Protection
•Password Protection
•32-Point Linearization
•Wide Viewing Angle
•Built-In Flange for Wall or Pipe Mounting
•Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum & Stainless Steel Enclosures
•Two 3/4" NPT or M20 Conduit Openings
•2" U-Bolt Kit Available
•3-Year Warranty

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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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.
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
•Failure to follow installation guidelines could
result in death or serious injury. Make sure only
qualified personnel perform the installation.
•Never remove the meter cover in explosive
environments when the circuit is live.
•Cover must be fully engaged to meet
flame-proof/explosion-proof requirements.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
© 2023 Precision Digital Corporation.
All rights reserved.
Introduction
The PD6801 is a rugged, full-featured,
explosion-proof loop-powered meter specifically
designed for level applications in hazardous areas or
in the harshest environmental conditions. Instead of
the usual decimal display, the meter displays level in
feet, inches, and fractions of an inch with a
20-segment tank level indicator. The secondary
display can show a custom unit or tag, percent full, or
a second scale for the 4-20 mA input used to indicate
volume. The backlight feature makes the display
visible under any lighting condition and can be
powered from either the 4-20 mA loop or from a
separate DC power supply.
The product is CSA Certified as Explosion-Proof,
Dust-Ignition-Proof, and Flame-Proof, and ATEX &
IECEx Certified as Explosion-Proof. It is available in
either an aluminum or stainless steel enclosure with
¾" or M20 conduit connections. It will operate down to
-40°C and is approved for installation in areas where
the temperature gets as cold as -55°C, however, the
display will cease functioning.
The meter derives all of its power from the 4-20 mA
loop thus making installation a simple matter of wiring
the instrument into the existing loop. No external
power is required. Programming is performed using
the four SafeTouch through-glass buttons and can be
done without removing the cover. In addition, the
meter can be scaled with or without a calibration
signal.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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Ordering Information
Aluminum Enclosure
Model
Description
PD6801-0K1
Explosion-Proof Loop-Powered
Feet & Inches Level Meter with
Backlight and Two 3/4" Conduit
Openings
PD6801-0K1-M20
Explosion-Proof Loop-Powered
Feet & Inches Level Meter with
Backlight and Two M20 Conduit
Openings
Stainless Steel Enclosure
Model
Description
PD6801-0K1-SS
Explosion-Proof Loop-Powered
Feet & Inches Level Meter with
Backlight and Two 3/4" Conduit
Openings
PD6801-0K1-SS-M20
Explosion-Proof Loop-Powered
Feet & Inches Level Meter with
Backlight and Two M20 Conduit
Openings
Accessories
Model
Description
PDAPLUG75
3/4" NPT 316 Stainless
Steel Conduit Plug with
Approvals
PDAPLUGM20
M20 316 Stainless Steel
Conduit Plug with
Approvals
PDAREDUCER-75M-M20F
M-3/4" NPT to F-M20
Reducer with Approvals
PDAREDUCER-75M-50F
M-3/4" NPT to F-1/2" NPT
Reducer with Approvals
PD9501
Multi-Function Calibrator
PD9502
Low-Cost Signal Generator
PDA1001
USB Power Bank
PDA1002
6" DIN Rail Mounting Kit
PDA1024-01
24 VDC Power Supply for
DIN Rail
PDA-SSTAG
Custom Stainless Steel
Tag (see website for
convenient ordering form)
PDA6846-SS
Stainless Steel 2" U-Bolt
Kit. All Material: Stainless
Steel; (1) U-Bolt for 2" Pipe
with (2 each) Washers,
Lock Washers, and Nuts
Note: Unless otherwise specified, the above accessories do not
carry hazardous area approvals and are thus not suitable for
location in hazardous areas.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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Table of Contents
Introduction......................................................................................................... 2
Ordering Information.......................................................................................... 3
Table of Contents ............................................................................................... 4
Physical Features............................................................................................... 6
Accessories ........................................................................................................ 8
Specifications..................................................................................................... 9
General............................................................................................................ 9
Input ................................................................................................................ 9
Open Collector Output................................................................................... 9
Enclosure...................................................................................................... 10
General Compliance Information................................................................ 11
Electromagnetic Compatibility.................................................................... 11
Product Ratings and Approvals.................................................................. 11
EU Declaration of Conformity ..................................................................... 12
Safety Information............................................................................................ 12
Installation......................................................................................................... 12
Unpacking..................................................................................................... 12
Cover Jam Screw ......................................................................................... 12
Mounting....................................................................................................... 12
Dimensions................................................................................................... 13
Connections ................................................................................................. 14
Wiring Diagrams........................................................................................... 15
External Acknowledge Connection ............................................................ 15
Open Collector Output Connections .......................................................... 15
Setup and Programming.................................................................................. 16
Overview....................................................................................................... 16
SafeTouch Buttons ...................................................................................... 16
SafeTouch Button Operation...................................................................... 16
SafeTouch Button Tips and Troubleshooting............................................. 16
Buttons and Display..................................................................................... 17
Main Menu Display Functions & Messages ............................................... 18
Main Menu..................................................................................................... 18
Setting Up the Meter (SETUP)....................................................................... 19
Setting Numeric Values ............................................................................. 19
Scaling the Meter (SCaLe).......................................................................... 20
Selecting Inch Fraction Display Mode (FRACTN)......................................... 20
Scaling the Tank Level Indicator (PERCENT)............................................... 20
Configuring the Lower Display (DISPLAY).................................................. 21
Setting the Tag (TAG) ................................................................................. 21
Advanced Features Menu (ADVANCE).......................................................... 22
Advanced Features Menu & Display Messages......................................... 22
Alarm Output (OUTPUT)............................................................................... 23
Input Signal Filter (FILTER)........................................................................ 23
Volume Display Scaling (VOLSCAL)............................................................ 23
Level Input Live Signal Calibration (LVL CAL)............................................ 24
Internal Calibration (ICAL).......................................................................... 24
Level Input Multipoint Linearization (MULTIPT)........................................... 24
Information (INFO)...................................................................................... 24
Setting Up the Password (PASSWRD)........................................................... 25
Locking the Meter ...................................................................................... 25
Making Changes to a Password Protected Meter...................................... 25
Disabling Password Protection .................................................................. 25
Operation........................................................................................................... 26
Front Panel Buttons Operation................................................................... 26
Display Maximum, Minimum, and Input Current ....................................... 26
Reset Meter to Factory Defaults.................................................................. 26
Factory Defaults & User Settings................................................................ 27
Troubleshooting............................................................................................... 27
Troubleshooting Tips................................................................................... 27
Quick User Interface Reference ...................................................................... 28

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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Table of Figures
Figure 1. Enclosure Dimensions - Front View.................................................... 13
Figure 2. Enclosure Dimensions - Side View..................................................... 13
Figure 3. Enclosure Dimensions - Top View...................................................... 13
Figure 4. Connector Board .................................................................................. 14
Figure 5. Connections without Backlight........................................................... 15
Figure 6. Connections with Loop-Powered Backlight....................................... 15
Figure 7. Connections with Externally-Powered Backlight................................. 15
Figure 8. External Alarm Reset/Acknowledge Connections............................ 15
Figure 9. Connection to Device with Internal Pull-Up ....................................... 15
Figure 10. Output Connections........................................................................... 15

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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Physical Features
The ProtEX-Pro PD6801-0K0 comes with two ¾" NPT conduit openings and the PD6801-0K0-M20 comes with two
M20 conduit openings.
Great for Cold Temperatures
The ProtEX-Pro PD6801 will operate over a
temperature range of -40 to 75°C (-40 to 167°F).
Below -40°C, the display will cease functioning,
however, the instrument is approved to be installed in
locations where the temperature goes down to -55°C.
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.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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Easy Pipe Mounting
The ProtEX-Pro comes with a built-in mounting flange.
This allows for easy mounting to walls or pipes using
the 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.
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.
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.
Stainless Steel Tag Attaching
Loop
The enclosure is equipped with a loop at the top to
easily attach a PDA-SSTAG stainless steel tag.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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Accessories
PDA1024-01 24 VDC Power Supply
The PDA1024-01 is a DIN rail mounted 1.5 A,
24 VDC power supply that can be used to power
the 4-20 mA transmitter.
PDA6846-SS 2"U-Bolt Kit
The PDA6846-SS U-Bolt Kit provides a convenient
way to mount the PD6801 to 1.5" or 2" pipes.
PDA-SSTAG Stainless Steel Tag
The PDA-SSTAG is a laser etched stainless steel tag
that can be customized with three lines of text. Each
tag comes with a stainless steel wire and lead seal for
easy mounting wherever you need.
Dimensions

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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Specifications
Except where noted all specifications apply to operation at +25°C.
General
Display
Feet &
Inches
0.60" (15.2 mm) high
0 to 699FT 1115/16 IN
7-segment, programmable
1/16 or 1/8 fraction display
Seven
characters
(Tag &/or
Volume)
0.4" (10.2 mm) high
14-segment, 7-digits
Tank Level
Indicator
20-segments
Display
Orientation
Display may be mounted at 90° increments
up to 270° from default orientation.
Display
Assignment
Upper display: Feet & inches
Lower display may be assigned to custom unit
or tag, volume, volume and tag, percent
height, percent height and tag, or off.
Display
Update Rate
Ambient > -25°C: 2 Updates/Second
Ambient < -25°C: 1 Update/5 Seconds
Backlight
White; Loop-powered or externally powered.
Backlight can be enabled or disabled via
alternative wiring of terminal block. Loop-
powered backlight brightness will increase as
the input signal current increases. Externally
powered backlight has consistent brightness.
Externally
Powered
Backlight
Voltage Range: 9-36 VDC
Supply V
9 VDC
12 VDC
24 VDC
36VDC
Max Pwr
0.2 W
0.25 W
0.5 W
0.75 W
Overrange
And
Underrange
Level display flashes to 699FT 1115/16 IN
Volume display flashes 9999999 if overrange,
-999999 if underrange.
Programming
Method
Four SafeTouch through-glass buttons when
cover is installed. Four internal pushbuttons
when cover is removed.
Noise Filter
Programmable low (LO), medium (MED), high
(HI), or off (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.
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
Environmental
Operating temperature range:
-40 to 75°C (-40 to 167°F)
Storage temperature range:
-55 to 75°C (-67 to 167°F)
Installation temperature range:
-55 to 75°C (-67 to 167°F)
(The display ceases to function below -40°C)
Relative humidity: 0 to 90% non-condensing
Printed circuit boards are conformally coated
Connections
Screw terminals accept 12 to 22 AWG wire
Mounting
May be mounted directly to conduit.
Built-in flange for wall mounting or
NPS 1½" to 2½" or DN 40 to 65 mm pipe
mounting. See Dimensions on page 13.
Overall
Dimensions
5.65" x 5.25" x 4.86" (W x H x D)
(144 mm x 133 mm x 124 mm)
Weight
Aluminum: 4.8 lbs (2.18 kg)
Stainless Steel: 8.7 lbs (4.3 kg)
Warranty
3 years parts and labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.
Input
Input
4-20 mA
Accuracy
±0.03% of calibrated span ±1 count
Maximum
Voltage Drop &
Equivalent
Resistance
Without Backlight
or with Externally
Powered Backlight
With Loop-Powered
Backlight
3.0 VDC @ 20 mA
6.0 VDC @ 20 mA
150 Ω @ 20 mA
300 Ω @ 20 mA
Temperature
Drift
50 PPM/C from -40 to 75C ambient
Multi-Point
Linearization
2 to 32 points, level and volume
independently programmed.
Minimum Span
Input 1 & Input 2: 0.10 mA
Calibration
Range
An Error message will appear if input 1
and input 2 signals are too close
together.
Input
Range
Minimum Span
Input 1 & Input 2
4-20 mA
0.10 mA
Input
Overload
Over current protection to 2 A max.
HART
Transparency
The meter does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption.
The meter is not affected if a HART
communicator is connected to the loop.
The meter does not display secondary
HART variables.
Open Collector Output
Rating
Isolated open collector, sinking NPN
30 VDC @ 150 mA max.
Alarm Output
Assign to level or volume for high or low
alarm trip point.
Deadband
0-100% FS, user selectable
Acknowledge
Front panel ENTER button and external
RESET terminals resets output and screen
indication.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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Enclosure
Material
AL Models: ASTM A413 LM6 die-cast
aluminum, copper-free, enamel coated
SS Models: ASTM A743 CF8M
investment-cast 316 stainless steel
Gasket
Fluoroelastomer
Rating
NEMA 4X, IP68 Explosion-proof
Color
AL: Blue
SS: Silver
Window
Borosilicate glass
Conduits
PD6801-0K0: Two 3/4" NPT
PD6801-0K0-M20: Two M20
PD6801-0K0-SS: Two 3/4" NPT
PD6801-0K0-SS-M20: Two M20
Flange
Built-in flange for wall and pipe mounting
Tamper-Proof
Seal
Cover may be secured with tamper-proof seal
Instrument
Tag Loop
Built-in loop for securing stainless steel tag
ATEX &
IECEx
Flame-proof protection
II 2 G D
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68
Tamb: -55°C to +85°C
Certificate No.: Sira 19ATEX1252U
Certificate No.: IECEx SIR 19.0075U
CSA
Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Group E, F, G;
Class III
Ex db IIC Gb
Ex tb IIIC Db
Class I, Zone 1, AEx db IIC Gb;
Zone 21, AEx tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate number: CSA 19.80011200U
UL
Class I, Division 1, Groups A, B, C and D
Class II, Division 1, Groups E, F and G
Class III;
Class I, Zone 1, AEx db IIC Gb
Zone 21, AEx tb IIIC
Ex db IIC Gb
Ex tb IIIC Db
IP66/IP68/TYPE 4X
Tamb: -55°C to +85°C
Certificate Number: E518920
Note: The above approvals are for the enclosure only.
See Product Ratings and Approvals on page 11 for
approvals on the entire instrument.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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General Compliance
Information
Electromagnetic Compatibility
EMC Emissions
•CFR 47 FCC Part 15 Subpart B Class A
emissions requirements (USA)
•ICES-003 Information Technology
emissions requirements (Canada)
•AS/NZS CISPR 11 Group 1 Class A
ISM emissions requirements
(Australia/New Zealand)
•EN 55011 Group 1 Class A ISM
emissions requirements (EU)
•EN 61000-6-4 Emissions requirements
for Heavy Industrial Environments -
Generic
EMC Emissions
and Immunity
EN 61326-1 EMC requirements for
Electrical equipment for measurement,
control, and laboratory use –industrial use
Product Ratings and Approvals
CSA
Explosion-proof for use in:
Class I, Division 1, Groups B, C and D
Dust-ignition-proof for use in:
Class II/III, Division 1, Groups E, F and G; T6
Flame-proof for use in:
Zone 1, Ex d IIC T6
Ta = -55 to 75°C
Enclosure: Type 4X & IP66/IP68
Certificate number: CSA 11 2325749
ATEX
Explosion-proof for use in:
II 2 G D
Ex db IIC T6 Gb
Ex tb IIIC T85°C Db IP68
Ta = -55 to 75°C
Certificate number: Sira 10ATEX1116X
IECEx
Explosion-proof for use in:
Ex db IIC T6 Gb
Ex tb IIIC T85°C Db IP68
Ta = -55 to 75°C
Certificate number: IECEx SIR 10.0056X
ATEX/IECEx Specific Conditions of Use
1. The equipment label and epoxy coating may generate
an ignition-capable level of electrostatic charges under
certain extreme conditions. The user should ensure
that the equipment is not installed in a location where
it may be subjected to external conditions (such as
high-pressure steam) which might cause a buildup of
electrostatic charges on non-conducting surfaces.
Additionally, cleaning of the equipment should be
done only with a damp cloth.
2. Flameproof joints are not intended to be repaired.
3. All entry closure devices shall be suitably certified as
“Ex d”, “Ex t” and “IP66/68” as applicable. Suitable
thread sealing compound (non-setting, non-insulating,
non-corrosive, not solvent based, suitable for the
ambient rating) must be used at the NPT conduit
entries to achieve the IPx8 rating while maintaining the
Ex protection concept.
Year of Construction
This information is contained within the serial number with
the first four digits representing the year and month in the
YYMM format.
For European Community:
The PD68XX Series must be installed in accordance with the
ATEX directive 2014/34/EU, the product certificate Sira
10ATEX1116X, and the product manual.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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EU Declaration of Conformity
For shipments to the EU and UK, a Declaration of
Conformity was printed and included with the product.
For reference, a Declaration of Conformity is also
available on our website www.predig.com/docs.
Safety Information
•Read complete instructions prior to installation
and operation of the annunciator.
•Risk of electric shock or personal injury.
•Hazardous voltages exist within enclosure.
•Installation and service should be performed only
by trained service personnel.
•Service requiring replacement of internal
components must be performed at the factory.
•In hazardous areas, conduit and conduit/stopping
plugs require the application of non-setting
(solvent free) thread sealant. It is critical that all
relevant hazardous area guidelines be followed
for the installation or replacement of conduit or
plugs.
Installation
For Installation in USA: The PD68XX Series must
be installed in accordance with the National Electrical
Code (NEC) NFPA 70.
For Installation in Canada: The PD68XX Series
must be installed in accordance with the Canadian
Electrical Code CSA 22.1. All input circuits must be
derived from a CSA approved Class 2 source.
For European Community: The PD68XX Series
must be installed in accordance with the ATEX
directive 2014/34/EU and the product certificate Sira
10ATEX1116X.
•Disconnect from supply before opening
enclosure.
•Keep cover tight while circuits are live.
•Conduit seals must be installed within 18"
(450 mm) of the enclosure.
•Use suitably certified and dimensioned cable
entry device and/or plug.
•Cable must be suitable for 90°C.
All controls and wiring connections are located on the
display module that is accessed by removing the
enclosure cover. The controls can be accessed
without removing the display module. The wiring
connections can be accessed by removing the display
module which is secured to the enclosure by two
captive screws.
Unpacking
Remove the meter from box. Inspect the packaging
and contents for damage. Report damages, if any, to
the carrier. If any part is missing or the meter
malfunctions, please contact your supplier or the
factory for assistance.
Cover Jam Screw
The cover jam screw should be properly installed
once the meter has been wired and tested in a safe
environment. The cover jam screw is intended to
prevent the removal of the meter cover in a
hazardous environment without the use of tools.
Using a M2 hex wrench, turn the screw clockwise until
the screw contacts the meter. Turn the screw an
additional 1/4 to 1/2 turn to secure the cover.
•Excess torque may damage the threads, screw
head, or wrench.
Mounting
The PD68XX Series includes a built-in mounting
flange that may be used for pipe mounting or wall
mounting. Alternatively, the unit may be supported by
the conduit using the conduit holes provided.
Refer to Figure 1 and Figure 2.
•Do not attempt to loosen or remove flange bolts
while the meter is in service.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
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Dimensions
All units: inches (mm)
Figure 1. Enclosure Dimensions - Front View
Figure 2. Enclosure Dimensions - Side View
Figure 3. Enclosure Dimensions - Top View
0.32
(8.2)
2.25
(57.2)
3.35 (85.1)
5.25 (133)
5.65
(144)
4.80
(122)

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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Connections
To access the connectors, remove the enclosure
cover and unscrew the two captive screws that fasten
the display module. Disconnect the ribbon cable and
remove the display module. Signal connections are
made to a four-terminal connector in the base of the
enclosure. Grounding connections are made to the
two ground screws provided on the base –one
internal and one external.
SIGNAL +
4-20 mA signal input positive
terminal connection
SIGNAL -
4-20 mA signal return/negative
terminal connection when not
using loop powered backlight.
BACKLIGHT +
+9-30 VDC when powering
backlight from external supply.
BACKLIGHT -
4-20 mA signal return/negative
terminal when using the
installed loop powered backlight
or ground/negative when power-
ing backlight from external
supply.
OUTPUT+
NPN open collector output
positive.
OUTPUT-
NPN open collector output neg-
ative.
RESET +
Contact closure alarm
acknowledge pull up to 3 VDC.
RESET-
Contact closure alarm
acknowledge ground/negative.
Refer to Figure 4 for terminal positions.
•Observe all safety regulations. Electrical wiring
should be performed in accordance with all
agency requirements and applicable national,
state, and local codes to prevent damage to the
meter and ensure personnel safety.
•Static electricity can damage sensitive
components.
•Observe safe handling precautions for
static-sensitive components.
•Use proper grounding procedures/codes.
•If the meter is installed in a high voltage
environment and a fault or installation error
occurs, high voltage may be present on any lead
or terminal.
Figure 4. Connector Board
SAFE-TOUCH
BUTTONS BACKLIGHT POWER
UNLOCK LOCK LOOP
9-36 VDC
+-+-
SIGNAL BACKLIGHT
+-+-
OUTPUT RESET

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
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15
Wiring Diagrams
Signal connections are made to a four-terminal
connector mounted in the base of the enclosure per
Figure 4. Connector Board.The enclosure also
provides one internal and one external earth
grounding screw.
For installations that don’t use the backlight, the
maximum voltage drop is 3 V and connections are
made per Figure 5.
For installations that use the backlight powered from
the meter, the maximum voltage drop is 6 V and
connections are made per Figure 6.
For installations that use the backlight powered from
an external source, the maximum voltage drop is 3 V
and connections are made per Figure 7.
Figure 5. Connections without Backlight
Figure 6. Connections with Loop-Powered Backlight
Loop-powered backlight brightness will increase as
the input signal current increases. If constant back-
light brightness is desired, the backlight should be
powered by an external source.
Figure 7. Connections with Externally-Powered Backlight
It is possible to use the same transmitter (signal loop)
power supply for the externally powered backlight.
The backlight circuit will draw 25 mA in addition to the
loop circuit.
External Acknowledge Connection
External acknowledge connections are made to two
terminals labeled RESET. Connect to a contact closure
source such as a relay or a pushbutton as shown in
Figure 8.
Figure 8. External Alarm Reset/Acknowledge
Connections
Open Collector Output Connections
Output connections are made to two terminals labeled
OUTPUT. Connect to an input device such as alarm
indicator as shown in Figure 9 or drive a relay as
shown in Figure 10.
•To avoid damaging the PD6801’s amplifying
components, use care not to wire incorrectly or
exceed output ratings. A diode, such as 1N4000
series, will provide protection from relay
transients.
Figure 9. Connection to Device with Internal Pull-Up
Figure 10. Output Connections
4-20 mA
Transmitter
+-+-
SIGNAL BACKLIGHT
Power
Supply
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
OUTPUT RESET
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER
4-20 mA
Transmitter
+-+-
SIGNAL BACKLIGHT
Slide Switch to
LOOP
Power
Supply +-+-
OUTPUT RESET
4-20 mA
Transmitter
+-+-
SIGNAL BACKLIGHT
Slide Switch to
9-36 VDC
Power Supply
Power
Supply +-+-
OUTPUT RESET
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNAL BACKLIGHT
+-+-
OUTPUT RESET
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNAL BACKLIGHT
+-+-
OUTPUT RESET
+
Alarm Recorder
orAnnunciator
(e.g. PD8-158) -
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNAL BACKLIGHT
+-+-
OUTPUT RESET
UNLOCK LOCK
SAFE-TOUCH
BUTTONS
LOOP9-36
VDC
BACKLIGHT
POWER

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
16
Setup and Programming
There is no need to recalibrate the meter for
milliamps when first received from the factory.
The meter is factory calibrated for milliamps prior to
shipment. The calibration equipment is traceable to
NIST standards.
Overview
Setup and programming is done through the infrared
through-glass SafeTouch buttons or using the
mechanical buttons when uncovered. There are two
slide switches located on the connector board. One is
used to select backlight power and the other is to lock
or unlock the SafeTouch Buttons.
After all connections have been completed and
verified, connect the ribbon cable to the display mod-
ule, fasten the display module to the base, install
enclosure cover, and then apply power.
SafeTouch Buttons
The PD6801 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 SAFE-TOUCH
BUTTONS switch located on the connector board in
the base of the enclosure.
SafeTouch Button Operation
To actuate a button, press and remove one finger
to the glass directly over the marked button area.
Remove finger to at least 4 inches away from the
glass in between button activations. SafeTouch and
mechanical buttons may be held to cycle through
menus or digits in place of repeatedly pushing a
button. The sensors are disabled when a mechanical
button is pressed and will automatically be re-enabled
after 60 seconds of inactivity.
SafeTouch Button Tips and
Troubleshooting
The SafeTouch buttons are designed to filter normal
levels of ambient interference and to protect against
false triggering, however, it is recommended that the
SafeTouch buttons be disabled (slide switch to LOCK)
if there is an infrared interference source in line-of-
sight to the display.
SafeTouch Button Tips:
•To the extent possible, install the display facing
away from sunlight, windows, reflective objects
and any sources of infrared interference.
•Keep the glass window clean.
•Tighten the cover securely.
•Use a password to prevent tampering.
•If the cover has not been installed and secured
tightly, it may take a moment for the SafeTouch
buttons to properly self-calibrate when the cover
is tightened.
•SafeTouch buttons will not work if two or more
buttons are detected as being pressed simultane-
ously. As a result, be careful to avoid triggering
multiple buttons or reaching across one button lo-
cation to press another.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
17
Buttons and Display
Button
Symbol
Description
Symbol
Status
Menu
FT
Feet
IN
Inches and
Fractional
Inches
Right
arrow/
Reset
20-Segment
Tank Level
Indicator
Bargraph
Up arrow/
Display
Password
Enabled
Enter/
Alarm
Acknowledge
Menu Button
•Press the Menu button to enter Programming
Mode.
•Press the Menu button during Programming
Mode to return to the previous menu
selections.
•Hold the Menu button for 1.5 seconds at any
time to exit Programming Mode and return to
Run Mode.
•Press and hold the Menu button for 5 seconds
to access the Advanced Features of the meter.
Right / Reset Button
•Press the Right arrow button to reset the
maximum or minimum value while it is being
displayed (see Up / Display Button below).
•Press the Right arrow button to move to the
next digit or decimal position during
programming.
•Press Right to go backward through most
selection menus.
Up / Display Button
•Press Display when in Run Mode to cycle
through displaying the maximum value, mini-
mum value, and the loop input value in mA.
The display will time out in 12 seconds. Press
Display again to resume normal lower display
operation (lower display will read RESUME).
•Press the Up arrow button to scroll forward
through the menus, decimal point, or to
increment the value of a digit.
Enter Button
•Press the Enter button to access a menu or to
accept a setting.
•Press Enter to acknowledge alarm (if enabled).
MENU
RESET
DISPLAY
ENTER

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
18
Main Menu Display Functions &
Messages
The meter displays various functions and messages
during setup, programming, and operation. The fol-
lowing table shows the main menu functions and
messages in the order they appear in the menu.
Display
Parameter
Action/Setting
SETUP
Setup
Enter Setup menu
SCALE
Scale
Enter the Scale menu
for feet and inches
INPUT 1
Input 1
Set input 1 value in mA
DSPLY 1
Display 1
Set display 1 feet and
inches
INPUT 2
Input 2
Set input 2 value in mA
DSPLY 2
Display 2
Set display 2 feet and
inches
SAVE ?
Save
Save entered scale
parameters
SPN ERR
Span Error
Scale point 1 and 2
span error
FRACTN
Fraction
Enter the Program
menu
1/16th
1/16th
Set display for 1/16th
inch fractions
OFF
Off
Turn off inch fraction
display
1/8th
1/8th
Set display for 1/8th inch
fractions
PERCENT
Percent
Scale the tank indicator
full and empty values
0 PCT
0 Percent
Set the tank empty
value
100 PCT
100 Percent
Set the tank full value
DISPLAY
Display
Enter Lower Display
menu
TAG
Tag
Display a custom unit or
tag
VOLUME
Volume
Display volume
VOL+TAG
Volume + Tag
Display volume and
custom tag
PCT HT
Percent Height
Display percent height
PCT+TAG
Percent Height
+ Tag
Display percent height
and custom tag
Main Menu
The main menu consists of the most commonly used
functions: Setup, Advanced, and Password.
Press MENU button to enter Programming Mode then
press the Up Arrow button to scroll through the main
menu.
Hold MENU, at any time, to exit and return to Run
Mode. Changes made to settings prior to pressing
ENTER are not saved.
Press the MENU button during Programming Mode to
return to the previous menu selections.
Changes to the settings are saved to memory only
after pressing ENTER.
The display moves to the next menu every time a
setting is accepted by pressing ENTER.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
19
Setting Up the Meter (SETUP)
The Setup menu is used to select:
1. Feet and inches display scale
2. Inch fraction display mode
3. Tank indicator full value
4. Lower display selection
Press the ENTER button to access any menu or
press UP arrow button to scroll through choices.
Hold MENU, at any time, to exit and return to Run
Mode. Changes made to settings prior to pressing
ENTER are not saved.
Press the MENU button during Programming Mode
to return to the previous menu selections.
Setting Numeric Values
The numeric values are set using the RIGHT and UP
arrow buttons. Press RIGHT arrow to select next digit
and UP arrow to increment digit.
The digit being changed blinks.
Press the ENTER button, at any time, to accept a
setting.
Hold MENU, at any time, to exit and return to Run
Mode. Changes made to settings prior to pressing
ENTER are not saved.
Press the MENU button during Programming Mode to
return to return to the previous menu selections.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter
Instruction Manual
20
Scaling the Meter (SCaLe)
The 4-20 mA input can be scaled to display the
process in engineering units. To scale the meter,
enter the value in milliamps (mA) for input 1, and then
the corresponding engineering units display value. Do
the same for input 2.
After entering the display 2 value, confirm the new
scale by pressing ENTER at the Save menu.
A signal source is not needed to scale the meter;
simply program the inputs and corresponding display
values.
For instructions on using multipoint scaling, see Level
Input Multipoint Linearization (MULTIPT), page 24.
For instructions on how to program numeric values
see Setting Numeric Values on page 19.
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to com-
plete the calibration or scaling of the meter. The mini-
mum span is 0.10 mA.
Scale Error Message (SPN ERR)
If the minimum span is not maintained, the meter will
show a span error (SPN ERR) and revert to input 2,
allowing the appropriate input signals to be applied.
Selecting Inch Fraction Display Mode
(FRACTN)
The display may be programmed to display fractions
of an in 1/8th or 1/16th increments, or to show no frac-
tion.
Scaling the Tank Level Indicator
(PERCENT)
The display includes a 20-segment tank height
indicator. This menu sets full and empty values, in
feet and inches, for the tank height indicator.
This value may differ from the 20 mA full-scale and 4
mA empty-scale values programmed in the Scale
menu. This is ideal for level transmitters that output
less than 20 mA at the maximum height of the tank or
pit or more than 4 mA at the minimum height.
As an example, when using a level transmitter that
outputs 20 mA at 250 feet, the tank height indicator
may be set for 100 feet, 0 inches. At 100 feet 0 inches
on the display, the tank height indicator will show as
full, even though the input is not 20 mA.