Precision Digital Corporation PD6801 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] • Fax [phone]
www.predig.com
•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 Upper Display With 1/8 or 1/16 Resolution
•0.4" (10.2 mm) 7 Alphanumeric Characters Lower 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°
•SafeTouchTM 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)
•FM Approved as Explosion-Proof / Dust-Ignition Proof / Flame-Proof
•CSA Certified as Explosion-Proof / Dust-Ignition Proof / Flame-Proof
•ATEX and IECEx Certified as Flame-Proof and Protection by Enclosure
•Conformal Coated PCBs for Dust and Humidity Protection
•Password Protection
•32-Point Linearization
•Wide Viewing Angle
•Flanges for Wall or Pipe Mounting
•Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum Enclosure
•Two 3/4" NPT Threaded Conduit Openings (One Plug Installed)
•2" U-Bolt Kits Available
•3-Year Warranty

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
2
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
flameproof/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.
© 2020 Precision Digital Corporation.
All rights reserved.
Introduction
The ProtEX-F&I PD6801 is a rugged, explosion-proof
loop-powered indicator specifically designed for level
applications in hazardous areas or in the harshest
environmental conditions. The meter displays level in
easy to read and understand feet, inches, and
fractions of an inch; and a 20-segment tank level
indicator. The lower 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 meter derives all of its power from the 4-20 mA
loop. It is programmed using the four SafeTouch
through-glass buttons, without removing the cover,
and can be scaled with or without a calibration signal.
The upper display will read up to 699 ft. – 11 15/16
inches. The alphanumeric volume/tag display will read
up to 9,999,999. The alphanumeric display can also
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 backlight lets you see the display under any
lighting condition and can be powered from either the
4-20 mA loop or from a separate DC power supply.
The enclosure is provided with two threaded conduit
holes and integrated pipe or wall mounting slotted
flanges.
Ordering Information
Model Description
PD6801-0K1
Explosion-Proof Loop-Powered
Feet & Inches Level Meter with
backlight
Accessories
Model Description
PDA0001 3/4" M-NPT to F-M20 Reducer
PDA0002 3/4" M-NPT to 1/2" F-NPT Reducer
PDA1024-01 24 VDC Power Supply for DIN Rail
PDA6846
Steel 2" U-Bolt Kit. All Material: Zinc
Plated Steel; (1) U-Bolt for 2" Pipe with
(2 each) Washers, Lock Washers, and
Nuts.
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.
PDA-SSTAG Custom Stainless Steel Tag (see
website for convenient ordering form)

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
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Table of Contents
Introduction......................................................................................................... 2
Ordering Information.......................................................................................... 2
Table of Contents ............................................................................................... 3
Specifications ..................................................................................................... 5
General............................................................................................................ 5
Input ................................................................................................................ 5
Open Collector Output................................................................................... 5
Product Ratings and Approvals.................................................................... 6
Electromagnetic Compatibility...................................................................... 6
Safety Information.......................................................................................... 6
Installation........................................................................................................... 7
Unpacking....................................................................................................... 7
Pre-Installed Conduit Plug ............................................................................ 7
Mounting ......................................................................................................... 7
Dimensions..................................................................................................... 7
Cover Jam Screw ........................................................................................... 8
Connections ................................................................................................... 8
Wiring Diagrams............................................................................................. 9
External Acknowledge Connection .............................................................. 9
Open Collector Output Connections ............................................................ 9
Setup and Programming.................................................................................. 10
Overview ....................................................................................................... 10
SafeTouch Buttons ...................................................................................... 10
SafeTouch Button Operation...................................................................... 10
SafeTouch Button Tips and Troubleshooting............................................. 10
Buttons and Display..................................................................................... 11
Main Menu Display Functions & Messages ............................................... 12
Main Menu..................................................................................................... 12
Setting Up the Meter (SETUP) ....................................................................... 13
Setting Numeric Values ............................................................................. 13
Scaling the Meter (SCaLe).......................................................................... 14
Selecting Inch Fraction Display Mode (FRACTN)......................................... 14
Scaling the Tank Level Indicator (PERCENT)............................................... 14
Configuring the Lower Display (DISPLAY) .................................................. 15
Setting the Tag (TAG) ................................................................................. 15
Advanced Features Menu (ADVANCE).......................................................... 16
Advanced Features Menu & Display Messages......................................... 16
Alarm Output (OUTPUT)............................................................................... 17
Input Signal Filter (FILTER)........................................................................ 17
Volume Display Scaling (VOLSCAL) ............................................................ 17
Level Input Live Signal Calibration (LVL CAL)............................................ 18
Internal Calibration (ICAL).......................................................................... 18
Level Input Multipoint Linearization (MULTIPT)........................................... 18
Information (INFO)...................................................................................... 18
Setting Up the Password (PASSWRD) ........................................................... 19
Locking the Meter ...................................................................................... 19
Making Changes to a Password Protected Meter...................................... 19
Disabling Password Protection .................................................................. 19

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
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Operation........................................................................................................... 20
Front Panel Buttons Operation ................................................................... 20
Display Maximum, Minimum, and Input Current ....................................... 20
Reset Meter to Factory Defaults.................................................................. 20
Factory Defaults & User Settings................................................................ 21
Troubleshooting ............................................................................................... 21
Troubleshooting Tips................................................................................... 21
Quick User Interface Reference ...................................................................... 22
EU Declaration of Conformity.......................................................................... 23
Table of Figures
Figure 1. Enclosure Dimensions – Front View................................................... 7
Figure 2. Enclosure Dimensions – Side Cross Section View ........................... 7
Figure 3. Connector Board .................................................................................. 8
Figure 4. Connections without Backlight ........................................................... 9
Figure 5. Connections with Loop-Powered Backlight....................................... 9
Figure 6. Connections with Externally-Powered Backlight............................... 9
Figure 7. External Alarm Reset/Acknowledge Connections............................ 9
Figure 8. Connection to Device with Internal Pull-Up ....................................... 9
Figure 9. Output Connections ............................................................................. 9

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:
Maximum Power
9-36
VDC
9
VDC
12
VDC
24
VDC
36
VDC
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
Storage temperature range: -40 to 75°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.
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. See Dimensions on page 7.
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. 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 Instruction Manual
6
Product Ratings and Approvals
FM
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:
Class I, Zone 1, AEx d Group IIC; T6
Protection by Enclosure:
Zone 21, AEx tb IIIC; T85°C
Ta = -40 to 75°C.
Enclosure: Type 4X, IP66.
Certificate number: 3040391
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 = -40 to 75°C.
Enclosure: Type 4X & IP66/IP68.
Certificate number: 2325749
ATEX
II 2 G D. Flame-proof for use in:
Zone 1, Ex d IIC T6 Gb
Protection by Enclosure for use in:
Dust Atmospheres (Zone 21)
Ex tb IIIC T85°C Db IP68.
Ta = -40°C to +75°C
Certificate number: Sira 10ATEX1116X
IECEx
Flame-proof for use in:
Zone 1, Ex d IIC T6 Gb
Protection by Enclosure for use in:
Dust Atmospheres (Zone 21)
Ex tb IIIC T85°C Db IP68.
Ta = -40°C to +75°C
Certificate number: IECEx SIR 10.0056X
Special Conditions for Safe Use:
Use suitably certified and dimensioned cable entry
device and/or plug. The equipment shall be installed
such that the supply cable is protected from mechani-
cal damage. The cable shall not be subjected to ten-
sion or torque. If the cable is to be terminated within
an explosive atmosphere, then appropriate protection
of the free end of the cable shall be provided.
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 PD6801 must be
installed in accordance with the ATEX directive
94/9/EC, and the product certificate Sira
10ATEX1116X.
Electromagnetic Compatibility
Emissions
EN 61326:2013
Safety requirements for measurement,
control, and laboratory use – Industrial
Group 1 Class A ISM emissions
requirements
Radiated
Emissions
Class A
Immunity
EN 61326:2013
Safety requirements for measurement,
control, and laboratory use
ESD ±4 kV contact, ±8 kV air
RFI –
Amplitude
Modulated
80-1000 MHz @ 10 V/m,
1.4-2.0 GHz @ 3 V/m,
2.0-2.7 GHz @ 1 V/m,
80% AM (1 kHz)
EFT ±2 kV DC mains, ±1 kV other
Telco Surge ±1 kV
CRFI 3 V, 0.15-80 MHz, 1 kHz 80% AM
Safety Information
•Read complete instructions prior to installation
and operation of the meter.
•Installation and service should be performed only
by trained service personnel. Service requiring
replacement of internal components must be
performed at the factory.
•Disconnect from supply before opening
enclosure. Keep cover tight while circuits are
alive. Conduit seals must be installed within
18" (450mm) of the enclosure.
•Verify that the operating atmosphere of the meter
is consistent with the appropriate hazardous
locations certifications.
•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.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
7
Installation
For Installation in USA: The PD6801 must be in-
stalled in accordance with the National Electrical
Code (NEC) NFPA 70.
For Installation in Canada:The PD6801 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 PD6801 must be
installed in accordance with the ATEX directive
94/9/EC and the product certificate Sira
10ATEX1116X.
•Disconnect from supply before opening
enclosure. Keep cover tight while circuits are
alive. Conduit seals must be installed within
18" (450mm) of the enclosure.
Wiring connectors are accessed by opening the
enclosure. To access electrical connectors, remove
the 2 captive screws, then disconnect the ribbon
cable from the display module and set the display
module aside.
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.
Pre-Installed Conduit Plug
The PD6801 is supplied with one pre-installed conduit
plug for installations that do not require the use of
both conduit entries. The conduit/stopping plug
includes an internal hexagonal socket recess for
removal. The conduit plug and its factory installation
are included in all hazardous area approvals of this
product.
•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.
Mounting
The PD6801 has two slotted mounting flanges that
may be used for pipe mounting or wall mounting. Al-
ternatively, 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.
Dimensions
All units: inches [mm]
Figure 1. Enclosure Dimensions – Front View
Figure 2. Enclosure Dimensions –
Side Cross Section View
3.35 (85.1)
2.25 (57.1)
(8.2)
5.25 (133.4)
(143.5)
5.65
0.32
3.35 (85.0)
4.15 (105.5)
3.22 (81.9) (123.5)
4.86

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
8
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 flame-
proof 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.
Caution: Excess torque may damage the threads
and/or wrench.
Connections
To access the connectors, remove the enclosure cov-
er and unscrew the two captive screws that fasten the
display module. Disconnect the ribbon cable and re-
move 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
negative.
RESET +
Contact closure alarm
acknowledge pull up to 3 VDC.
RESET-
Contact closure alarm
acknowledge ground/negative.
Refer to Figure 3 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 3. 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 Instruction Manual
9
Wiring Diagrams
Signal connections are made to a four-terminal
connector mounted in the base of the enclosure per
Figure 3. 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 4.
For installations that use the backlight powered from
the meter, the maximum voltage drop is 6 V and
connections are made per Figure 5.
For installations that use the backlight powered from
an external source, the maximum voltage drop is 3 V
and connections are made per Figure 6.
Figure 4. Connections without Backlight
Figure 5. 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 6. 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 7.
Figure 7. 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 8 or drive a relay as
shown in Figure 9.
•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 8. Connection to Device with Internal Pull-Up
Figure 9. Output Connections
4-20 mA
Transmitter
+-+-
SIGNALBACKLIGHT
Power
Supply
UNLO CK LOCK
SAFE-TOUCH
BUT TONS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
OUTP U TRESET
UNLO CK LOCK
SAFE-TOUCH
BUT TONS
LOOP9-36
VDC
BACKLIGHT
POWER
4-20 mA
Transmitter
+-+-
SIGNA LBACKLIGHT
Slide Switch to
LOOP
Power
Supply
+- +-
OUTP U TRESET
4-20 mA
Transmitter
+-+-
SIGNA LBACKLIGHT
Slide Switch to
9-36 VDC
Power Supply
Power
Supply
+-+-
OUTP U TRESET
UNLO CK LOCK
SAFE-TO UCH
BUT TO NS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNA LBACKLIGHT
+-+-
OUTP U TRESET
UNLO CK LOCK
SAFE-TOUCH
BUT TO NS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNA LBACKLIGHT
+-+-
OUTP U TRESET
+
Alarm Recorder
or Annunciator
(e.g. PD8-158)
-
UNLO CK LOCK
SAFE-TO UCH
BUT TO NS
LOOP9-36
VDC
BACKLIGHT
POWER
+-+-
SIGNA LBACKLIGHT
+-+-
OUTP U TRESET
UNLO CK LOCK
SAFE-TOUCH
BUT TO NS
LOOP9-36
VDC
BACKLIGHT
POWER

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
10
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 simulta-
neously. As a result, be careful to avoid triggering
multiple buttons or reaching across one button
location to press another.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
11
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
ENTER
DISPLAY

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
12
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
13
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
14
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 18.
For instructions on how to program numeric values
see Setting Numeric Values on page 13.
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 min-
imum 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.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
15
Configuring the Lower Display
( DISPLAY )
The lower display may be configured to display a
custom tag (TAG), volume (VOLUME), volume and tag
(VOL+TAG), percent of full height (PCT HT), or percent
of full height and tag (PCT+TAG) or be blank (OFF).
A custom tag may be up to seven alphanumeric
characters programmed for identification (e.g. TANK 3)
or for engineering units (e.g. GALLONS).
Volume is a separate, second scale of the input
process variable. This is configured in Volume Display
Scaling (VOLSCAL)on page 17.
Percent full height shows the percent full of the tank
height level indicator programmed in the Scaling the
Tank Level Indicator (PERCENT)menu, on page 14.
The tank level indicator (GRAPH) may also be turned
on or off from the display menu.
Setting the Tag ( TAG )
Any lower display setting that includes a tag will
require the tag to be entered.
The fully alphanumeric values for the tag are set
using the RIGHT button to select the digit, the UP and
RIGHT arrow buttons to select the digit reading, and
the ENTER button to confirm and select the next digit.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
16
Advanced Features Menu
(ADVANCE)
To simplify the setup process, functions not needed
for most applications are located in the Advanced
Features Menu. Access the Advanced Features Menu
by pressing ENTER at the ADVANCE menu in the
Main Menu defined on page 12.
The Advanced Features Menu is used to select:
1. Open collector
output configuration
(OUTPUT)
2. Input filter (FILTER)
3. Volume display
scale (VOLSCAL)
4. Live signal level
display calibration
(LVL CAL)
5. Internal Calibration
(ICAL)
6. Multipoint
linearization for level
(MULTIPT)
7. Meter system
information display
(INFO)
Advanced Features Menu & Display
Messages
The following table shows the Advanced features
menu functions and messages in the order they
appear in the menu.
Display
Parameter
Action/Setting
OUTPUT Output Enter output menu
OFF Off Disable output
ALARM Alarm Output Enter alarm output
menu
LEVEL Level Alarm Assign alarm output to
level
SET Set Point Set alarm set point
RESET Reset Point Set alarm reset point
VOLUME Volume Alarm Assign alarm output to
volume
FILTER Filter Set noise filter
LO Filter Low Set noise filter to low
setting
MED Filter Medium Set noise filter to
medium setting
HI Filter High Set noise filter to high
setting
OFF Filter Off Disable noise filter
Display Parameter Action/Setting
VOLSCAL Volume Scale Scale the volume
display
NO PTS Number of
Points
Set the number of
points for volume
scaling
INPUT 1 Input 1 Set volume input 1 on
the level display
DSPLY 1 Display 1 Set volume display 1
INPUT 2 Input 2 Set volume input 2 on
the level display
DSPLY 2 Display 2 Set volume display 2
SAVE ?Save Save entered volume
scale parameters
LVL CAL Level
Calibration
Calibrate the level
display
INPUT 1 Input 1 Calibrate input 1 value
DSPLY 1 Display 1 Set display 1 feet and
inches
INPUT 2 Input 2 Calibrate input 2 value
DSPLY 2 Display 2 Set display 2 feet and
inches
SAVE ? Save Save entered calibration
parameters
ICAL Internal
Calibration
Enter internal reference
calibration
4mA 4 mA Calibrate input at 4 mA
20mA 20 mA Calibrate input at 20 mA
ERRSPAN Error Span Error with calibration
point 1 and 2 span
MULTIPT Multipoint Set level display
multipoint linearization
DISABLE Disable Disable multipoint
linearization
ENABLE Enable Enable multipoint
linearization
INFO Meter
Information
Show software number
and version, or reset to
factory defaults
SOFT Software Software number
VERSION Software
Version
Software version
For instructions on how to program numeric
values, see Setting Numeric Values on page 13.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
17
Alarm Output ( OUTPUT )
The PD6801 is equipped with an NPN open collector
output that may be set up for high or low alarm trip
point based on the level display (LEVEL) or the volume
scale (VOLUME). The output may be disabled by
selecting OFF.
When the alarm is enabled for level and the alarm set
point has been reached, the level display will flash,
accompanied by the lower display alternating
between normal display and ALARM. A tank height
indicator segment will flash at the level the alarm is
set to while the level indicator is at or above the alarm
point.
When the alarm is enabled for volume and the alarm
set point has been reached, the lower display will
flash, alternating between its normal display and
ALARM.
To set a high alarm, program the set point value to be
greater than the reset point.
To set a low alarm, program the set point value to be
less than the reset point.
To acknowledge an alarm, press the ENTER button
once for acknowledge prompt and a second time to
confirm. Acknowledging an alarm will turn off the
alarm output and stop the display from flashing. The
lower display will continue to alternate between its
normal display and ALARM until the alarm condition is
cleared.
The alarm status will show on the display even if the
output is not wired.
Input Signal Filter ( FILTER )
The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level can be set to low (LO), medium
(MED), high (HI), or off (OFF). The higher the filter
setting, the longer the averaging time and so the
longer the display may take to find its final value.
The filter contains a noise filter bypass feature so that
while small variations in the signal will be filtered out,
large, abrupt changes to the input signal are
displayed immediately.
Volume Display Scaling ( VOLSCAL )
Volume may be scaled as a function of the feet and
inches level display. It may use up to 32-point
linearization. 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.
To display the volume, select a lower display
including the volume display in the Display menu as
shown in Configuring the Lower Display (DISPLAY) on
page 15.
To scale the volume display, enter the level in feet
and inches for input 1, and then the corresponding
volume display value. Do the same for input 2.
After entering the display 2 value, confirm the new
volume scale by pressing ENTER at the Save menu.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
18
Level Input Live Signal Calibration
( LVL CAL )
The meter can be calibrated using a current source
instead of scaling. This process will override previous-
ly programmed scaling of the level display.
The use of a calibrated signal source is strongly
recommended.
Internal Calibration ( ICAL )
There is no need to recalibrate the meter when
first received from the factory. The meter is factory
calibrated prior to shipment. The calibration
equipment is traceable to NIST standards
The internal calibration is the meter’s master
calibration that makes scaling the meter without a
signal source possible. Use of a calibrated signal
source is necessary to perform an internal calibration
of the meter. Check calibration of the meter at least
every 12 months. Incorrect calibration will affect the
ability of the meter to properly read, scale, and display
the input.
Notes:
The signal source must have a full-scale accuracy
of 0.002% or better between 4 and 20 mA in order
to maintain the specified accuracy of the meter.
Allow the meter to warm up for at least 15 minutes
before performing the calibration procedure.
Press and hold the MENU button for 5 seconds to
enter the Advanced Features menu. Press the UP
arrow button to scroll to the Internal Calibration menu
(ICAL) and press ENTER.
The meter displays 4 mA. Apply a 4.000 mA signal
and press ENTER. The display flashes for a moment
while the meter is accepting the signal.
After the signal is accepted, the meter displays 20 mA.
Apply a 20.000 mA signal and press ENTER. The
display flashes for a moment while the meter is
accepting the signal.
Calibration Error Message (SPN ERR)
An error message indicates that the calibration
process was not successful. After the error
message is displayed, the meter will revert to the
4 mA calibration menu. The error message might be
caused by inadvertently leaving the signal at the
previous level or not maintaining the minimum span.
Press the MENU button to cancel the current
calibration process if necessary.
Level Input Multipoint Linearization
( MULTIPT )
This menu enables multipoint linearization for scaling
and calibrating of the level display.
Setting MULTIPT to ENABLE allows the level display to
be scaled or calibrated using up to 32 points. See
Scaling the Meter (SCaLe) on page 14 and Level Input
Live Signal Calibration (LVL CAL) on page 18, to
include aNumber of Points (NO PTS) parameter
before entering Input 1.
32-point linearization can be used to linearize the
display for non-linear signals.
PD6801 Displaying Height in Feet and Inches and
Volume (Using Multi-Point Linearization Feature) in
Gallons in a Round Horizontal Tank.
Information ( INFO )
The Information menu shows the software
identification number and version number.
To determine the software version of a meter:
Go to the Information menu (INFO) and press ENTER
button.
Continue pressing ENTER to scroll through the
software release number and software version.
Following the information display, the meter will exit
the Advanced Features menu and return to run mode.

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
19
Setting Up the Password
(PASSWRD)
The Password menu is used to program a five-digit
password to prevent unauthorized changes to the
programmed parameter settings. A password
protected meter will display LOCKED when the MENU
button is pressed.
Locking the Meter
Enter the Password menu and program a five-digit
password.
For instructions on how to program numeric values
see Setting Numeric Values, page 13.
Record the password for future reference. If appropri-
ate, it may be recorded in the space provided.
Model:
Serial Number:
Password: __ __ __ __ __
Making Changes to a Password
Protected Meter
If the meter is password protected, the meter will
display the message LOCKED when the Menu button
is pressed. Press the Enter button while the message
is being displayed and enter the correct password to
gain access to the menu. After exiting the program-
ming mode, the meter returns to its password
protected condition.
Disabling Password Protection
To disable the password protection, access the
Password menu and enter the correct password,
as shown below.
If the correct five-digit password is entered, the meter
displays the message UNLOCKD (unlocked) and the
protection is disabled until a new password is
programmed.
If the password entered is incorrect, the meter
displays the message LOCKED and returns to Run
Mode. To try again, repeat the above procedure.
Did you forget the password?
The password may be disabled by entering a
master password. If you are authorized to make
changes, enter the master password 50865 to
unlock the meter.
FT IN
FT IN

PD6801 Explosion-Proof Loop-Powered Feet & Inches Level Meter Instruction Manual
20
Operation
Front Panel Buttons Operation
Button Symbol
Description
Press to Enter or Exit
Programming Mode
Used to Reset Maximum and
Minimum Values
Press to Cycle Displaying
Maximum Value, Minimum
Value, and Input Current in mA
Press to Resume Run Mode in
Lower Display
Press to Acknowledge Alarm
(if Enabled)
Display Maximum, Minimum,
and Input Current
The maximum and minimum values and the
measured input loop current may be displayed
temporarily on the lower display. To display these
values, press the DISPLAY button. The meter will
display the word MAXIMUM on the lower display and
the maximum value reached (since the last maximum
reset) on the upper display. Press the DISPLAY
button again and the meter will display the word
MINIMUM on the lower display and the minimum value
reached on the upper display. Pressing the RESET
button while either of these values is displayed will
reset that value to the current display value.
Press the DISPLAY button a third time and the meter
will display LOOP MA on the lower display, followed by
the measured input current in milliamps (mA). The
current display will remain for 10 seconds and then
the lower display will return to normal run mode as
programmed in Configuring the Lower Display
(DISPLAY) on page 15. Press the DISPLAY button a
fourth time to return to the normal operation. The
meter will display RESUME followed by the run mode
lower display.
Reset Meter to Factory Defaults
When the parameters have been changed in a way
that is difficult to determine what’s happening, it might
be better to start the setup process from the factory
defaults.
Instructions to load factory defaults:
Enter the Advanced features menu.
Press and hold RESET button when INFO is shown.
For information on navigating to the Information
menu, refer to Advanced Features Menu
(ADVANCE)on page 16.
Press ENTER when DFALTS? prompt is flashing.
Note: If ENTER is not pressed within three seconds,
the prompt will stop flashing return to run mode.
MENU
RESET
FT IN
FT IN
FT IN
FT IN
FT IN
FT IN
ENTER
DISPLAY