Precision Digital Corporation PD6908 User manual

PD6908 Loop-Powered Process Meter

Instruction Manual

PRECISION DIGITAL CORPORATION

233 South Street • Hopkinton MA 01748 USA

Tel (800) 343-1001 • Fax (508) 655-8990

www.predig.com

•Loop-Powered Field-Mount Process Meters

•4-20 mA Input Displayed with ±0.02% of Full-Scale Accuracy

•1.5 Volt Drop (4.7 Volt Drop with Backlight)

•0.7" (17.0 mm) 5 Alphanumeric Characters Top Display

•0.4" (10.2 mm) 8 Alphanumeric Characters Bottom Display

•20-Segment Bargraph Standard

•Display Mountable at 0°, 90°, 180°, & 270°

•CapTouch Through-Window Button Programming with Normal and Delayed Modes

•Loop-Powered Backlight with Red Backlight for Alarm Conditions

•(2) Open Collector Outputs Standard; Assignable to Pulse, Alarm, Timer, or Stopwatch

•(2) Optional Loop-Powered Solid-State Relays; Assignable to Alarm, Control, Timer, or Stopwatch

•Stopwatch & Timer Functions to Drive Relays & Open Collectors

•Optional Isolated 4-20 mA Analog Output

•Relay Pump Alternation Based on Level and Runtime

•Display Relay Runtime & Cycle Count via Relay Info Menu

•Round Horizontal Tank Function; Just Enter Diameter & Length

•32-Point Linearization, Square Root Extraction andProgrammable Exponent Function

•Free PC-Based MeterView XL USB Programming Software

•Enable and Disable Backlight from Menu

•Operating Temperature Range: -40 to 75°C (-40 to 167°F)

•Conformal Coated PCBs for Dust & Humidity Protection

•Password Protection

•Flange for Wall or Pipe Mounting; Loop for Stainless Steel Tag; Holes for Tamper-Proof Seal

•Plastic NEMA 4X, IP66 Enclosure

•Three 3/4" NPT Threaded Conduit Openings (Two Plugs Included)

•3-Year Warranty

MeterView XL

USB Install

PD6908 Loop-Powered Process Meter

Instruction Manual

The Complete PD6900 Series

Plastic Enclosures - General Purpose

PD6907-GP-PL

4-20 mA Input

Feet & Inches Meter

PD6908-GP-PL

4-20 mA Input

Process Meter

PD6928-GP-PL

4-20 mA Input

Flow Rate/Totalizer

PD6938-GP-PL

Pulse Input

Flow Rate/Totalizer

Aluminum Enclosures - Hazardous Area Approved

PD6907-HA-AL

4-20 mA Input

Feet & Inches Meter

PD6908-HA-AL

4-20 mA Input

Process Meter

PD6928-HA-AL

4-20 mA Input

Flow Rate/Totalizer

PD6938-XX-AL

Pulse Input

Flow Rate/Totalizer

Stainless Steel Enclosures - Hazardous Area Approved

PD6907-HA-SS

4-20 mA Input

Feet & Inches Meter

PD6908-HA-SS

4-20 mA Input

Process Meter

PD6928-HA-SS

4-20 mA Input

Flow Rate/Totalizer

PD6938-XX-SS

Pulse Input

Flow Rate/Totalizer

PD6908 Loop-Powered Process Meter 
Instruction Manual 
 
3
 
Table of Contents 
Introduction..........................................................................................................6 
Key Features ........................................................................................................7 
Ordering Information.........................................................................................11 
Accessories ...................................................................................................11 
Specifications.....................................................................................................13 
Display............................................................................................................13 
General...........................................................................................................13 
Enclosure.......................................................................................................14 
Input................................................................................................................14 
Common Open Collector & Relay Specifications.......................................14 
Open Collector Outputs................................................................................14 
Solid-State Relays .........................................................................................15 
4-20 mA Transmitter Output.........................................................................15 
On-Board Digital Input..................................................................................15 
MeterView XL Software.................................................................................15 
Compliance Information....................................................................................16 
Electromagnetic Compatibility.....................................................................16 
EU Declaration of Conformity...........................................................................16 
Safety Information .............................................................................................16 
Installation..........................................................................................................17 
Unpacking......................................................................................................17 
Conduit Plugs Included ................................................................................17 
Mounting ........................................................................................................17 
Dimensions....................................................................................................17 
Connections.......................................................................................................18 
Display & Options Modules..........................................................................18 
Connectors Labeling.....................................................................................19 
Wiring Diagrams ................................................................................................21 
Current Loop (4-20 mA) Connections .........................................................21 
Digital Input Connections ............................................................................21 
4-20 mA Output Connections......................................................................21 
Solid-State Relay Connections....................................................................21 
Open Collector Output Connections............................................................22 
Remote Operation of Meter.........................................................................22 
Setup and Programming...................................................................................23 
Overview.........................................................................................................23 
CapTouch Buttons ........................................................................................23 
CapTouch Buttons Delay ............................................................................23 
Turning Off CapTouch Buttons....................................................................23 
CapTouch Button Tips & Troubleshooting ..................................................23 
MeterView XL Programming Software.........................................................24 
CapTouch Buttons and Status Indicators...................................................25 
Display Functions & Messages....................................................................26 
Main Menu......................................................................................................30 
Setting Numeric Values...............................................................................31 
Scaling the 4-20mAInput (INPUT)...................................................................32 
Available Unit Classes and Units ................................................................33 
Setting Custom Units (CUSTOM)..................................................................34 
Setting the Display Features (DISPLAY).....................................................34 
Changing the Engineering Units (UNITS)...................................................34 
Changing the Decimal Point (DEC.PT).........................................................34 
Enabling or Disabling Commas on the Bottom Display (COMMA)................35 
Display Capabilities Optimization (TOP and BOTTOM) ................................35 
Configuring the Display (TOp and BOTTOM)................................................36 
Programming the Bargraph (BARGRAPH)....................................................37 

PD6908 Loop-Powered Process Meter 
Instruction Manual 
 
4
Programming the Outputs (OUTPUT)...........................................................37 
Open Collector Outputs 
(
OPEN COLLECTR
)
 .................................................38 
Solid-State Relay Outputs (RELAY) ............................................................43 
Isolated 4-20 mA Output (4-20 mA) ..........................................................49 
Output Manual Control (CONTROL).............................................................49 
Advanced Features Menu (ADVANCE)..........................................................50 
Advanced Process Variable Setup (ADV PV SETUP) ...............................51 
Low-Flow Cutoff (CUTOFF)..........................................................................58 
Noise Filter (FILTER) .................................................................................58 
Enabling Password Protection (PASSWRD) .................................................58 
Programmable Function Keys User Menu (USER)......................................59 
Tare (TARE).................................................................................................60 
Changing System Settings (SYSTEM).........................................................61 
Meter Operation .................................................................................................63 
CapTouch Buttons Operation ......................................................................63 
CapTouch Buttons ........................................................................................63 
CapTouch Button Tips & Troubleshooting ..................................................63 
Function Keys Operation..............................................................................64 
Digital Input Operation..................................................................................64 
Maximum/Minimum Readings......................................................................64 
Runtime & Cycle Count (INFO)....................................................................64 
Changing Engineering Units........................................................................64 
Troubleshooting.................................................................................................65 
Reset Meter to Factory Defaults...................................................................65 
Determining Software Version.....................................................................65 
Factory Default Settings..............................................................................66 
Troubleshooting Tips....................................................................................67 
 

PD6908 Loop-Powered Process Meter

Instruction Manual

Table of Figures

Figure 1. Enclosure Dimensions –Front View....................................................17

Figure 2. Enclosure Dimensions –Side View .....................................................17

Figure 3. Enclosure Dimensions –Top View ......................................................17

Figure 4. Connector Labeling for PD6908-GP-PL-LNN.......................................19

Figure 5. Connector Labeling for PD6908-GP-PL-L2N.......................................19

Figure 6. Connector Labeling for PD6908-GP-PL-L3N.......................................20

Figure 7. Connector Labeling for PD6908-GP-PL-L5N.......................................20

Figure 8. 4-20 mA Input Connection without Backlight .....................................21

Figure 9. 4-20 mA Input Connection with Backlight...........................................21

Figure 10. Digital Input Connections ...................................................................21

Figure 11. 4-20 mA Output Connections .............................................................21

Figure 12. Solid-State Relay Connections...........................................................21

Figure 13. Open Collector Output Connections..................................................22

Figure 14. PDA2361-R Control Station Connected to PD6928...........................22

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PD6908 Loop-Powered Process Meter

Instruction Manual

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.

•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.

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.

Registered Trademarks

All trademarks mentioned in this document are

the property of their respective owners.

Introduction

The PD6908 VantageView+ loop-powered process

meter can be installed in a variety of harsh operating

environments to provide convenient and informative

display of any 4-20 mA signal. One of the most

convenient features of these instruments is their

dual-line display which is typically used to display the

process variable on the 5-character alphanumeric top

display and the units of measure or a tag on the

8-character alphanumeric bottom display. Another

common setup is to display the input in one scale on

the top display (such as feet) and in another scale on

the bottom display (such as gallons). The top display

uses 12-segment, and the bottom display uses

14-segment alphanumeric characters for clear

indication of tags, units, or alarm messages.

Further enhancing the display on these instruments is

a 20-segment bargraph.

These loop-powered meters can be installed virtually

anywhere because they get their power from the

4-20 mA loop and therefore require no separate

power source. And they only drop 1.5 V (4.7 V with

backlight), so they add very little burden to the loop.

Additional features that allow these instruments to be

installed virtually anywhere include a NEMA 4X, IP66

plastic enclosure, an operating temperature range of

-40 to 167°F (-40 to 75°C), conformally coated PCBs,

and a backlit LCD that can be read in bright sunlight

or dimly lit areas.

Free, PC-based, MeterView XL software that

connects to the meter via a micro USB cable is

available for programming and setup of the meters.

For more details, see the MeterView XL manual. Four

CapTouch through-window buttons are available to

operate the instrument without removing the cover.

All models come equipped with two open collector

outputs and a digital input. There are also models

available with two solid-state relays and isolated

4-20 mA analog output options. The open collector

outputs are useful for alarm indication. The digital

input can be used to acknowledge the relays, to

start/stop a timer/stopwatch, and more. The relays

can be programmed for alarm indication, on/off

control, or pump alternation.

PD6908 Loop-Powered Process Meter

Instruction Manual

Key Features

2X More Informative Display

The PD6908 display offers a 50% larger display area

and is twice more informative than previous

generations of loop-powered meters. Featuring an

alphanumeric dual-line display and a 20-segment

bargraph, reading and understanding process values

is easy and intuitive. The addition of status indicators

provides a quick glance at alarm conditions, relays,

process trends, and more. Predefined display units

give users even more display flexibility. Plus, the high

contrast backlit LCD display is readable from far away

and under various lighting conditions.

Backlight Turns Red on Alarm

When an alarm occurs, the display can be

programmed to turn red, flash, and display an alarm

indicator . In addition, a unique custom alarm

message for each of the two relays and two open

collectors can be displayed on the bottom display.

These features can be activated even if no relay or

open collector is connected.

CapTouch Through-Window

Buttons

The PD6908 is equipped with four capacitive sensors

that operate as through-window buttons so that it can

be operated without removing the cover (and

exposing the electronics) in a harsh operating area.

CapTouch buttons are designed to work under any

lighting condition and to protect against false

triggering. They can be disabled for security via a

switch on the display module.

CapTouch buttons have two modes of operation:

Normal and Delayed. Delayed mode prevents

accidental trigger of the buttons. In the Delayed

mode, the buttons enter into a low sensitivity state

(sleep) and they ignore quick button presses after 20

seconds of inactivity. To wake up the buttons, press

and hold any button for more than 2 seconds, the

buttons respond normally.

Solid State Relays 1-2

Indicators

Predefined

Display Units

0.7" (17.0 mm) High

5-Character, Alphanumeric

12-segment

Password Protection

Process Trend

Indicators

CapTouch Buttons

Self-Calibration

0.4" (10.2 mm) High

8-Character, Alphanumeric

14-segment

Two-Color

Backlight

Alarm Indicator

20-Segment

Bargraph

CapTouch Buttons /

Function Keys

PD6908 Loop-Powered Process Meter

Instruction Manual

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. Plus, the

display module can be rotated in 90° increments

providing added mounting flexibility.

Dual-Scale Feature

Users can use the dual-scale feature to display the

input in two different scales. For instance, the

example above shows an application where the

display shows the input in feet and gallons while the

display toggles between process values and units.

Predefined and Custom Units

The meter has six available preprogrammed unit

classes: volume, height, temperature, pressure,

weight, and rate. When the desired unit class or unit

of measure within a class is not available, a custom

unit may be programmed.

14-Segment Characters

Notice how much better letters like “T”, “N” and “K”

appear as14-segment characters on the bottom display

vs. 7-segment characters found on other meters.

Password Protection

A password can be set up for programming security to

prevent unauthorized changes to the programmed

parameter settings.

Enable / Disable Backlight

The backlight may be enabled or disabled using the

System - Backlight menu. The backlight is enabled by

default, but the input must be wired appropriately for

the backlight to function. See Enabling or Disabling

the Backlight (BACKLITE) on page 62 for details.

Multiple Outputs

•Two open collector outputs (standard)

•Two solid-state relays (optional)

•One 4-20 mA output (optional)

The open collector outputs and relays generally

operate in the same manner, with the major exception

being the open collectors are not available for pump

alternation and the relays are not available with pulse

features. The open collectors and relays can be

controlled either automatically or manually.

The isolated analog output signal can be configured

to represent the process variable (PV1, PV2, or

retransmit). It can also be reverse scaled such that

the meter’s high calibration value outputs 4 mA and

the meter’s low calibration outputs 20 mA.

Free MeterView XL

Programming Software

The fastest and easiest way to program the meter is

using the free Meterview XL programming software.

This software greatly simplifies the programming

process and allows the user to save configuration files

for later use.

The meter connects to the PC via a provided micro-

USB cable and is powered by the USB connection, so

no additional power is needed during programming.

Easy Wiring & Service

The PD6908 has been designed for easy wiring and

servicing. All connections are made to removable

screw terminal blocks. There are no exposed printed

circuit boards.

PD6908 Loop-Powered Process Meter

Instruction Manual

Modern and Practical Enclosure

The PD6908 NEMA 4X, IP66 plastic enclosure

provides serious protection from the elements, high

impact, corrosion, dust, etc.

Built-In Flange for Pipe Mounting

The built-in mounting flange allows easy mounting to

walls or pipes.

A slot on the back makes it easy to center the unit on

a pipe. There are three ¾" NPT threaded conduit

holes for wiring. Two ¾" NPT plastic conduit plugs are

included.

SS Tag Attaching Loop

The enclosure is also equipped with a loop at the top

to easily attach a PDA-SSTAG stainless steel tag.

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.

PD6908 Loop-Powered Process Meter

Instruction Manual

Pump Alternation

The PD6908 can be used as a pump controller to

alternate two pumps and indicate high and low alarm

conditions. The pumps can be programmed to

alternate on level and runtime and the display can be

programmed to turn red and flash a message on

alarm conditions. The meter can display the pump

runtimes and the number of times they have cycled.

See the Pump Control with Alternation & Alarm

Example on page 47 for full details.

Relay #2 turns the main pump on at 6000 gallons and

turns it off at 1000 gallons. lights up to show relay

2 is energized. The indicates level is rising.

With the Pump Alternation feature activated, the next

time the level reaches 6000 gallons, relay #1 transfers

and starts the backup pump. lights up to show

relay 1 is on.

Input Signal Conditioning

To satisfy applications that require scaling in ways

other than the usual 2-point linear method, the

PD6908 can also be scaled for square root (DP flow),

programmable exponent (open channel flow) or round

horizontal tank volume calculation.

Round Horizontal Tank

Linearization

This function automatically calculates the volume in a

round horizontal tank with flat ends and allows that

reading to be displayed on the bottom display. This

results in a meter that displays the height of the tank

on the top display and volume on the lower display.

The user only needs to enter the diameter and length

of the tank and the meter takes care of the rest.

Square Root Linearization

The square root function can be used to linearize the

signal from a differential pressure transmitter and

display flow rate in engineering units.

Programmable Exponent

Linearization

The programmable exponent can be used to linearize

the signal from level transmitters in open-channel flow

applications using weirs and flumes.

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