Precision Digital Corporation PD690 Series User manual

D I G I T A L PA N E L M E T E R S
Model PD690 Universal Process Meter
Instruction Manual
• Easy Single Button Scaling (SBS)
• 4-20 mA, 0-5 V, or 0-10 V Field Selectable Inputs
• 24 V Transmitter Power Supply Standard
• Scale Without a Calibrator
• Calibrate with a Signal Source
• Steady, Accurate Display to ± 199,990
• 11-Point Linearization for Non-Linear Inputs
• Square Root Extraction with Low-Flow Cutoff
• 41/2 Digit + Extra Zero
•NEMA 4X, IP65 Front Panel
•2 or 4 Relays + 4-20 mA Output Options
• 115 VAC, 230 VAC, or 24 VDC Power Options
• Lockout Feature
• Non-Volatile Memory, No Battery Needed
PRECISION DIGITAL CORPORATION
19 Strathmore Road •Natick MA 01760 USA
Tel [phone] •Fax [phone] www.predig.com
®

Model PD690 Universal Process Meter Instruction Manual
INTRODUCTION ......................................................................................4
Typical Applications ..........................................................................4
Ordering Information..........................................................................4
Safety Notice ........................................................................................5
Specifications ......................................................................................6
Basic Meter..........................................................................................6
Options ................................................................................................7
Display Messages and Functions....................................................9
SETUP AND PROGRAMMING ............................................................10
Power, Signal, External Functions & Options Connections..10
Overview ............................................................................................11
Wiring Instructions............................................................................11
AC Powered Units (Power, Signal, External Functions) ................12
DC Powered Units (Power, Signal, External Functions) ................14
Relays & 4-20 mA Output ................................................................15
4-20 mA Output ............................................................................16
Programming ......................................................................................17
Overview............................................................................................17
Single Button Scaling (SBS) ............................................................17
Two-point External Calibration Flow Chart ................................18
Five Basic Digit/Display-setting Instructions ..............................19
Basic Meter Programming ..............................................................19
Overview ........................................................................................19
Select Input Signal ........................................................................20
Initial Calibration with External Source (If Needed) ..................20
Select Calibration Method ............................................................21
Scale or Calibrate the Meter ........................................................21
Select Decimal Point (dE[Pt) ....................................................21
Select Linear Input (L or S) ....................................................21
Select Number Of Calibration Points (no. PtS) ......................21
General Calibration/Scaling Instructions ................................22
Scale Using Internal Calibration (I-[al) ................................22
Calibrate Using an External Calibrator (E-[al) ......................23
Calibration Error (Error) ..........................................................23
Programming Confirmation......................................................23
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Model PD690 Universal Process Meter Instruction Manual
Select Square Root Extraction (L or S) ..................................24
Program Low-Flow Cutoff ([vtoff)..........................................24
Round Horizontal Tank Calibration Table ..................................25
Isolated 4-20 mA Output Option Programming (ovtpvt)........26
Setting 4 mA Output Value........................................................26
Setting 20 mA Output Value......................................................26
Programming Confirmation......................................................26
Alarm Programming ........................................................................27
Overview ........................................................................................27
Setting Alarm Set & Reset Points (Alars) ..................................27
Programming Confirmation ........................................................28
Alarm Operation............................................................................28
Set Relays for Fail-Safe Operation ..............................................28
Alarm Acknowledgment ..............................................................29
Automatic & Manual Reset Programming ..................................29
Lockout Jumper ................................................................................30
SWITCHING INDUCTIVE LOADS ......................................................30
AC & DC Loads ..............................................................................30
Low Voltage DC Loads ................................................................31
RC Networks Available from Precision Digital ....................31
OPTION CARD INSTALLATION ..........................................................32
MOUNTING DIMENSIONS ..................................................................33
PROGRAMMED PARAMETER SETTINGS ........................................34
OTHER PRECISION DIGITAL PRODUCTS........................................35
HOW TO CONTACT PRECISION DIGITAL........................................36
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Model PD690 Universal Process Meter Instruction Manual
INTRODUCTION
This meter is a high performance, easy to use, industrial-grade micro-
processor-based digital process meter. It accepts all the standard
process signals: 4-20 mA, 1-5V, 0-5V and 0-10V and displays these sig-
nals in engineering units on a 41/2digit display. The display includes
an extra zero, which may be used to handle numbers up to 199,990.
The meter also provides 24 VDC to power the transmitter. Options
include 2 or 4 relays and an Isolated 4-20 mA Transmitter Output.
Typical Applications
Level:
Sump Pump Control
Water Tank Level
Round Horizontal Tank Volume Measurement
Well Draw-down
Lift Station Control
Flow:
Square Root Extraction from a DP Transmitter
Pressure:
Compound Pressure
High Pressure Alarms
Ordering Information
Ordering example: PD690-3G-14, process meter powered from
115 VAC (-3) with 2 relays (-14).
*Part numbers for Option Cards when purchased separately
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115 VAC 230 VAC 24 VDC Options Installed Option
Model Model Model Card*
PD690-3-N PD690-4-N PD690-2-N No Options
PD690-3-14 PD690-4-14 PD690-2-14 2 Relays PD174
PD690-3-15 PD690-4-15 PD690-2-15 4-20mA Out PD175
PD690-3-16 PD690-4-16 PD690-2-16 2 Relays + PD176
4-20 mA Out
PD690-3-17 PD690-4-17 PD690-2-17 4 Relays PD177
PD690-3-18 PD690-4-18 PD690-2-18 4 Relays + PD178
4-20 mA Out

Model PD690 Universal Process Meter Instruction Manual
Safety Notice
Observe all safety regulations. Electrical wiring should be
performed in accordance with all applicable national, state
and local codes to prevent damage to the Meter and ensure
personnel safety.
Do not use this meter to directly drive heavy equipment such
as pumps, motors, valves, etc.
It is recommended to use this meter in a fail-safe system
that accommodates the possibility of meter failure or power
failure.
WARNING
Hazardous voltages exist within enclosure. Installation
and service should be performed only by trained service
personnel.
AVERTISSEMENT
Les pièces à l'intérieur du boîtier portent des tensions
dangereuses. Seules des personnes qualifiées et bien
entrainées devraient entreprondre l'ótalonnage et la
maintenance.
DISCLAIMER
The information contained in this document is subject to change with-
out notice. Precision Digital 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.
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CAUTION: Read complete instructions
prior to installation and operation of
the Meter.
WARNING: Risk of
electric shock.

Model PD690 Universal Process Meter Instruction Manual
SPECIFICATIONS
Except where noted all specifications apply to operation at +25ºC
Basic Meter
INPUTS Field selectable:
4-20 mA, 0-20 mA, 0-5 V, 1-5 V, 0-10 V.
DISPLAY Bright, large, 0.56" (14.2mm) high efficiency
red LEDs. 41/2digits + extra zero may be
switched on to display +/- 19,999(0). Leading
zeros blanked.
DECIMAL POINT Decimal point may be placed in any of the
following positions. 1.9999, 19.999,199.99,
1999.9, 19999 or 199990 with extra zero.
CALIBRATION 4 mA (1 V) input may be set anywhere in range
RANGE of the meter. 20 mA (5 V) may be set anywhere
in range of the meter above or below 4 mA
input. An Error message will appear if Input 1
signal and Input 2 signal are too close together.
Input Minimum Difference Between
Range: Input 1 & Input 2:
0-5 V 0.16 V
0-10 V 0.32 V
4-20 mA 1.60 mA
INPUT Voltage ranges, greater than 300 KΩ;
IMPEDANCE current ranges, 100-120 Ω.
LOOP POWER (AC powered meters only), Isolated 24 VDC ± 5%
@ 20 mA regulated. Maximum loop resistance
is 1200 Ω. Available for either signal input or
4-20 mA output, but not both.
HOLD READING Connect terminals H and CM
ACCURACY ±0.05% of calibrated span, ±1 count.
SQUARE ROOT ±0.1% F.S. ± 1 count from 10-100% of flow.
EXTRACTION
LOW FLOW Any input below the Low-Flow Cutoff point will
CUTOFF result in a display of zero.
May be set from 1
count to 100% of full scale, user selectable.
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Model PD690 Universal Process Meter Instruction Manual
11-POINT Input Range Minimum Span
LINEARIZATION Between Inputs
4-20 mA (1.6 mA / (Number of points –1))
0-5 V (0.16 V / (Number of points -1))
0-10 V (0.32 V / (Number of points -1))
e.g. Minimum span for an 11-point, 4-20 mA calibration is 0.16 mA between inputs.
ALARM POINTS Four, any combination of high or low alarms.
ALARM POINT 0-100% of full scale, user selectable.
DEADBAND
ALARM STATUS Front panel LED.
INDICATION
LOCKOUT Jumper J3 restricts modification of
calibration values.
NON-VOLATILE All programming values are stored in non-
MEMORY volatile memory for a minimum of ten years if
power is lost. No battery needed.
NORMAL MODE 64 dB at 50/60 Hz
REJECTION
POWER
AC power, 115 or 230 VAC ±10%, 50/60 Hz, 10 VA.
DC Power, 18-36 VDC; 6 watts maximum.
ENCLOSURE 1/8 DIN, High Impact plastic, UL 94V-0
FRONT PANEL Type 4X, NEMA 4X, Panel Gasket provided
ENVIRONMENTAL Operational ambient temperature range: 0 to
+60°C. Storage temperature range: -40 to +85°C.
Relative humidity: 0 to 90% non-condensing.
WEIGHT 19.7 oz (559 g) (including options)
CONNECTIONS Removable screw terminal blocks (provided)
accept 22 to 12 AWG wire.
WARRANTY 2 years parts & labor.
EXTENDED 1 or 2 years, refer to the Price List for details.
WARRANTY
UL FILE NUMBER E160849; 508 Industrial Control Equipment
Options
Relays
RATING 2 or 4 SPDT (form C); rated 2 Amp @ 30 VDC
or 2 Amp @ 250 VAC resistive load; 1/14 HP @
125 / 250 VAC for inductive loads.
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Model PD690 Universal Process Meter Instruction Manual
RESET User Select:
1. Automatically when input passes reset point.
2. Automatically + Manually (via user supplied
switch or front panel ACK button). Manual
reset resets all manually resetable relays.
DEADBAND 0-100% of full scale, user selectable.
HIGH OR LOW User may program any alarm for a high or low
ALARM trip point.
FAIL-SAFE Relay coils are energized in non-alarm
OPERATION condition. In case of power failure, relays will
go to alarm state. Fail-Safe operation may be
disabled, by removing jumper J2 located on the
Options Board.
AUTO When power is applied to the meter, relays will
INITIALIZATION
always reflect the state of the input to the meter.
Isolated 4-20 mA Transmitter Output
CALIBRATION The transmitter output can be calibrated so that
RANGE a 4 mA output is produced for any number
displayed by the meter. The 20 mA output may
correspond to any number that is at least 501
counts greater or smaller than the number
corresponding to 4 mA. (Ex. 4 mA = 0, 20 mA =
501) If the span between 4 and 20 mA is less
than 501 counts, an error message will appear.
EQUIPMENT The 4-20 mA output is calibrated without
NEEDED the use of a calibrator. No equipment needed.
OUTPUT (AC powered meters only), Isolated 24 VDC ± 5%
LOOP-POWER @ 20 mA regulated. Maximum loop resistance
is 1200 Ω. Available for either signal input or
4-20 mA output, but not both.
ACCURACY ± 0.1% F.S., ± 0.004 mA.
ISOLATION 500 VDC or peak AC, input-to-output or
input/output-to-power line.
EXTERNAL LOOP- 35 VDC max.
POWER SUPPLY
OUTPUT LOOP Power supply Min. loop Max loop
RESISTANCE resistance resistance
24 VDC 10 !600 !
35 VDC (external) 600 !1000 !
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Model PD690 Universal Process Meter Instruction Manual
9
Display Messages and Functions
The following table describes the various messages displayed by the
meter during programming and operation:
Display Parameter Description/Comments
E-[AL Select External Set meter for calibration using
Calibration an external calibration source.
I-[AL Select Internal Set meter for calibration (scaling)
Calibration using Internal calibration source.
[ALIb Perform External Calibrate meter using an external
Calibration calibration source.
S[ALE Perform Internal Calibrate meter (scale) using
Calibration internal calibration source.
(scaling) (Signal source not required).
InPt 1 Input 1 Set Input 1 calibration value.
Dspy 1 Display 1 Set Display 1 calibration value.
Inpt 2 Input 2 Set Input 2 calibration value.
Dspy 2 Display 2 Set Display 2 calibration value.
DE[Pt Decimal Point Set decimal point or light up
extra "0".
No. PtS Number of Points Set meter for 2 to 11
calibration points.
L or S Linear or Square Set meter for Linear or Square Root
calibration/scaling.
[vtoFF Low-Flow Cutoff Set meter to display zero below
programmed cutoff point.
Alars Alarms Program alarm/relay set and
reset points.
OvtPvt Output Set 4-20 mA output values.
19999 Overrange Indicates input signal exceeds
full-scale range of meter.
-19999 Underrange Indicates input signal is below the
negative range of meter.
Error Error Indicates calibration was not
successful.

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Model PD690 Universal Process Meter Instruction Manual
10
SETUP AND PROGRAMMING
Power, Signal, External Functions & Options Connections
Disconnect power to the meter before making any connections.
Do not connect power or earth ground to any unused or CM terminals.
Observe polarity for DC powered Meters. Applying voltage with
reverse polarity may damage the instrument.
Connecting 230 VAC to a meter specified to accept 115 VAC or con-
necting AC power to a meter specified to accept DC power will result
in damage to the instrument as well as endanger personnel. Keep pri-
mary wires separated from signal cables.
Notice:
•Primary voltages must not be accessible to the user.
•Primary wires must be installed in accordance to the applicable
standards.
Terminals Designation
Terminal Description
L, L AC input power
V+, V- DC input power
P+, P- 24 VDC output
power
S+, S- Input signal
AK External relay
acknowledge
Terminal Description
H Hold reading
CM Common (return)
for AK and H
+, - 4-20 mA output
1-6 Relay 1-4

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Overview
The following field wiring connections are made to removable screw
terminal blocks supplied with the meter:
Power, Signal Input, Acknowledge and Hold
Options: Relays & 4-20 mA Output
Figure 1: Rear View of Meter (Connectors)
Wiring Instructions
1. All field connections to be made with either solid or stranded
insulated wire. Strip length = 1/4" (7 mm). Tighten all screw
terminals to 4.5 lb-in (0.5 Nm). Do not pre-treat wire with solder.
2. Terminals connected to line voltage (e.g. L, RELAY 1-4): Use AWG
# 12-18 copper wire, 600 volt, 60°C or 60/75°C. Connect only one
wire to each terminal.
3. Terminals not connected to line voltage (e.g. AK, H, CM, S+, S-, P+,
P-, V+, V-, OUTPUT): Use AWG #12-22 wire. If using AWG #20 or
smaller wire, up to two wires may be connected to each terminal.
If using AWG #18 or larger wire, only one wire
may be connected to each terminal.
Model PD690 Universal Process Meter Instruction Manual
11
AKH S S P P L L
+
+
-
-
-
+
J3 J2 J1
6 5 4 3 2 1 6 5 4 3 2 1
CM
Label Main Board (Lower) Wire Size
None Power 12-18
None Signal, Acknowledge, Hold 12-22
Options Board (Upper)
J1 4-20 mA Output 12-22
J2 Relays 1 & 2; NC, NO, Common 12-22
J3 Relays 3 & 4; NC, NO, Common 12-22

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Model PD690 Universal Process Meter Instruction Manual
AC Powered Meters (Power, Signal, External Functions)
Figure 2: Transmitter Powered from Meter
Figure 3: Transmitter Powered from External Power Supply
12
AC
4-20 mA
Transmitter
–
+
3 2 1
Signal Input
Selection
Array
Lockout
Jumper
LLP+ P- S- S+ CHA
OLC
MDK
Signal Input
Selection
Array
Loop
Power Supply 4-20 mA Transmitter
AC
–– + +
321
Lockout
Jumper
LLP+ P- S- S+ CHA
OLC
MDK

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Model PD690 Universal Process Meter Instruction Manual
13
AC Powered Meters (Continued)
Figure 4: Three-Wire Transducer Powered from Meter
Figure 5: Voltage or Self-Powered 4-20 mA Input
AC
3-Wire
Transducer
SignalP-P+
3 2 1
Signal Input
Selection
Array
Lockout
Jumper
LLP+ P- S- S+ CHA
OLC
MDK
See page 20
for Input Signal
selection table
Voltage or Current
Input
AC
–+
3 2 1
Signal Input
Selection
Array
Lockout
Jumper
LLP+ P- S- S+ CHA
OLC
MDK
See page 20
for Input Signal
selection table

Model PD690 Universal Process Meter Instruction Manual
DC Powered Meters (Power, Signal, External Functions)
Figure 6: Transmitter and Meter Powered from Same DC
Power Supply
Figure 7: Transmitter and Meter Powered from
Separate DC Power Supplies
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24 VDC
Power Supply 4-20 mA Transmitter
–– + +
321
V- V+ S- S+ C
O
M
H
L
D
A
C
K
Signal Input
Selection
Array
Lockout
Jumper
*For signal/power isolation seperate
power supplies are required.
Loop
Power Supply 4-20 mA Transmitter
–– + +
3 2 1
Signal Input
Selection
Array
Lockout
Jumper
24 VDC
V- V+ S- S+ C
O
M
H
L
D
A
C
K

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Model PD690 Universal Process Meter Instruction Manual
Relays & 4-20 mA Output
Depending on the model number, the Options Board may contain two
or four relays and an Isolated 4-20 mA Transmitter Output. Relay con-
nections are made to removable screw terminal connectors located at
J2 and J3 on the Options Board. Connections for the Isolated 4-20 mA
Transmitter Output are made to J1 on the Options Board.
Figure 8: Option Card Pinouts
Notes:
1. Alarm acknowledgement terminals (ACK and COM) are located on
the meter main board.
2. In the alarm condition, the NC contact is connected to common in
the fail safe mode.
Figure 9: Rear View of Meter (Connectors)
15
Relay #1 Common
Relay #1 NC
Relay #1 NO
Relay #2 Common
Relay #2 NC
Relay #2 NO
Relay #3 Common
Relay #3 NC
Relay #3 NO
Relay #4 Common
Relay #4 NC
Relay #4 NO
Function:
Transmitter +
Transmitter -
Pin:
1
2
3
4
5
6
1
2
1
2
3
4
5
6
PD175
PD178
PD177
PD176
PD174
J1
J2
J3
AKH S S P P L L
+
+
-
-
-
+
J3 J2 J1
6 5 4 3 2 1 6 5 4 3 2 1
CM

Model PD690 Universal Process Meter Instruction Manual
4-20 mA Output
The 4-20 mA output from the meter can either be powered from the
meter’s internal transmitter power supply, (if it is not being used to
power the input loop), or by an external power supply as the follow-
ing diagrams illustrate:
Figure 10: Meter Powering 4-20 mA Output Loop
Figure 11: External Power Supply Powering 4-20 mA
Output Loop
If the output loop is powered by an external supply, the loop
power supply must be turned on before the meter is turned
on. Otherwise, the output loop signal may be incorrect.
16
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+
+
+
-
--
Signal
Input
Meter, Recorder
Controller, etc.
A H S S P P L L
+ -
- +
CM
++
+
+
-
-
-
-
Signal
Input Loop Power Supply
Meter, Recorder
Controller, etc.
A H S S P P L L
+ -
- +
CM

Model PD690 Universal Process Meter Instruction Manual
17
Programming
Overview
The meter is programmed using the ENTER button and three jumper
arrays. The ENTER button controls the meter’s
S ingle B utton S caling
(SBS) feature that allows the meter to be completely programmed
using just one button.The jumper arrays are used for programming
the input signal, lockout, relays acknowledge enable and relays fail-
safe operation.
Single Button Scaling (SBS)
S ingle B utton S caling is a technique that allows the meter to be com-
pletely programmed using just the ENTER button. The general
method behind
(SBS) is to push ENTER when the meter reads the
desired value. This value may be a menu title, the entire display or
just a single digit. If the meter is not reading the desired value wait
and the value will change. When the meter finally reads the desired
display push ENTER to accept it.
When the meter is first powered up, it will read a random number.
Pushing ENTER will cause the meter to scroll through the following
menu titles (if the Lockout Jumper is not installed):
Figure 12: Menu Scroll (with Lockout Jumper Removed)
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Push
ENTER
2 point
Calibration Set
Decimal
Point
Linearization
or
Square Root
11 point
Calibration Program Alarms Calibrate
4-20 mA
Output
Push
ENTER Push ENTER Push ENTER Push ENTER Push ENTER
Push ENTER Display scrolls programming routines.
Push ENTER to select desired routine.
** Only appears if 4-20 mA output is installed
*

Figure 13: Two-point External Calibration Flow Chart
Model PD690 Universal Process Meter Instruction Manual
18
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Calibration
Complete!
Push ENTER
Apply
input 1 signal
(e.g. 4 mA)
Push ENTER
Is
entire flashing
display OK? Push ENTER
Wait for
digit to flash Has
input 2 been
calibrated
yet?
Is
the flashing
digit OK?
Push ENTER
Push
ENTER when OK
Wait for digit
to scroll
Is
entire display
flashing?
YES
YES
YES
YES
NO
NO
NO
NO

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Model PD690 Universal Process Meter Instruction Manual
19
Five Basic Digit/Display-setting Instructions
Rather than repeat the S ingle B utton S caling (SBS ) technique for
every function it is used in, it will be detailed here and the user can
refer to it when necessary.
The
S ingle B utton S caling technique is used to program all the
meter's functions that require numbers to be entered. For instance,
calibration and scaling values, Low-Flow Cutoff values, alarm set and
reset points, 4 and 20 mA output values are set using
(SBS).
1. If the flashing display is OK, push ENTER before it stops flashing
to accept it. (Whenever a new value is to be programmed or Most
Significant Digit has been accepted the entire display flashes, if
this is the desired value, press ENTER before it stops flashing to
accept it.)
2. If the flashing display is not OK, (or if ENTER was not pushed in
time to accept it), wait for Least Significant Digit (LSD) to flash.
3. If a flashing digit is OK, push ENTER before it starts to scroll to
accept it.
4. If a flashing digit is not OK, (or if ENTER was not pushed in time
to accept it), wait for the digit to scroll and push ENTER when OK.
5. Digits will scroll until ENTER is pushed. When a digit is accepted
by pushing ENTER, the next digit to the left flashes.
Basic Meter Programming
Overview
There are four steps for programming the basic meter functions:
1. Select Input
2. Perform Initial Calibration if Needed
3. Select Calibration Method
4. Calibrate or Scale the Meter
Programmed Parameter Values
To simplify programming, the user should write down the desired
programming values prior to attempting to program the meter. The
form located at the back of this manual provides a convenient method
to record the user settings.

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Model PD690 Universal Process Meter Instruction Manual
Select Input Signal
The meter can be programmed to accept current or voltage input
using the Signal Input Selection Array. This jumper array is located at
the rear of the instrument, next to the screw terminal block. Remove
jumper J3 (if installed) to disable Lockout feature.
Table 1: Signal Input Selection Array
Initial Calibration with External Source (If Needed)
Initial calibration is required only when the I-[AL feature is to be
used with an input other than the default input of 4-20 mA. For best
results, allow the meter to warm up for at least 30 minutes.
1. Program the Signal Input Selection Array for desired input per
Table 1 above.
2. Apply power with ENTER and ACK buttons pushed. Release when
display stops flashing.
3. The meter scrolls through the choices 20, 5, and 10. Which
corresponds to input signals of 4-20 mA, 0-5 V or 1-5 V, and 0-10 V.
Push ENTER when desired value appears.
4. The meter flashes InPt 1. Apply low end signal, (4 mA or 0 V)*,
push ENTER.
5. The meter flashes InPt 2. Apply high end signal, (20 mA, 5 V,
10 V), push ENTER.
6. This completes the Initial Calibration and initializes INPUT 1 and
INPUT 2 scaling points to 4.000 & 20.000 mA, 0.000 & 5.000 V, or
0.000 & 10.000 V.
7. Refer to I-[AL scaling below for further instructions.
*For 1-5 V input signals, calibrate the meter with input1=0 V,
input 2=5 V.
20
Input Signal Jumper J1 Jumper J2
1-5, 0-5V OFF OFF
0-10 V OFF ON
4-20,0-20 mA ON OFF