OHAUS PR Series User manual

Balances
Instruction Manual
Balanzas
Manual de Instrucciones
Balance de
Waagen
Bedienungsanleitung
Bilance
Manuale di Istruzioni

PR Series Balance EN-1
Table of Contents
1. INTRODUCTION..............................................................................................................EN-3
1.1 Description ............................................................................................................................................. EN-3
1.2 Features................................................................................................................................................. EN-3
1.3 Definition of Signal Warnings and Symbols........................................................................................... EN-3
1.4 Safety Precautions................................................................................................................................. EN-3
2. INSTALLATION ...............................................................................................................EN-4
2.1 Unpacking .............................................................................................................................................. EN-4
2.2 Select the Location ................................................................................................................................ EN-4
2.3 Leveling.................................................................................................................................................. EN-4
2.4 Connecting Power and Acclimating the Balance ................................................................................... EN-4
2.5 Connecting the Interface........................................................................................................................ EN-5
2.6 Initial Calibration .................................................................................................................................... EN-5
3. OPERATION ....................................................................................................................EN-6
3.1 Overview of Display, Home Screen ....................................................................................................... EN-6
3.2 Principal Functions and Main Menu....................................................................................................... EN-7
3.3 Overview of Parts and Features Draft Shield Mode ........................................................................... EN-7
3.4 Overview of Parts and Features Non-Draft Shield Models................................................................. EN-7
4. APPLICATIONS...............................................................................................................EN-8
4.1 Weighing ................................................................................................................................................ EN-8
4.2 Parts Counting ....................................................................................................................................... EN-8
4.3 Percent Weighing................................................................................................................................. EN-10
4.4 Additional Features .............................................................................................................................. EN-12
5. MENU SETTINGS..........................................................................................................EN-13
5.1 Menu Navigation .................................................................................................................................. EN-13
5.1.1 Changing Settings............................................................................................................................ EN-13
5.2 Calibration............................................................................................................................................ EN-14
5.2.1 Calibration Sub-menu (InCal models).............................................................................................. EN-14
5.2.2 Internal Calibration (not applicable to ExCal models)...................................................................... EN-14
5.2.3 Cal Adjust (not applicable to ExCal models).................................................................................... EN-14
5.2.4 Span Calibration............................................................................................................................... EN-14
5.2.5 Linearity Calibration ......................................................................................................................... EN-15
5.3 Balance Setup...................................................................................................................................... EN-17
5.3.1 Filter Level........................................................................................................................................ EN-17
5.3.2 AZT (Auto Zero Tracking) ................................................................................................................ EN-17
5.3.3 Auto Tare ......................................................................................................................................... EN-17
5.3.4 Graduations...................................................................................................................................... EN-18
5.3.5 Date Format ..................................................................................................................................... EN-18
5.3.6 Date Setup ....................................................................................................................................... EN-18
5.3.7 Time Format..................................................................................................................................... EN-18
5.3.8 Time Setup....................................................................................................................................... EN-19
5.3.9 Brightness ........................................................................................................................................ EN-19
5.3.10 Auto Dim .......................................................................................................................................... EN-19
5.3.11 Approved Mode................................................................................................................................ EN-20
5.4 Weighing Units..................................................................................................................................... EN-20
5.5 RS232 Interface Setup......................................................................................................................... EN-21
5.5.1 Baud Rate ........................................................................................................................................ EN-21
5.5.2 Transmission.................................................................................................................................... EN-22
5.5.3 Handshake....................................................................................................................................... EN-22
5.6 Print Settings........................................................................................................................................ EN-22
5.6.1 Stable Only....................................................................................................................................... EN-22
5.6.2 Numeric Only ................................................................................................................................... EN-23
5.6.3 Single Header .................................................................................................................................. EN-23
5.6.4 Auto Print ......................................................................................................................................... EN-23
5.6.5 Header ............................................................................................................................................. EN-24
5.6.6 Date and Time.................................................................................................................................. EN-24
5.6.7 Balance ID........................................................................................................................................ EN-24
5.6.8 Balance Name.................................................................................................................................. EN-24

EN-2 PR Series Balance
5.6.9 User Name....................................................................................................................................... EN-24
5.6.10 Project Name ................................................................................................................................... EN-24
5.6.11 Application Name............................................................................................................................. EN-24
5.6.12 Result ............................................................................................................................................... EN-24
5.6.13 Gross................................................................................................................................................ EN-24
5.6.14 Net.................................................................................................................................................... EN-25
5.6.15 Tare.................................................................................................................................................. EN-25
5.6.16 Line Feed ......................................................................................................................................... EN-25
5.7 GLP...................................................................................................................................................... EN-25
5.7.1 Header ............................................................................................................................................. EN-25
5.7.2 Balance Name .................................................................................................................................. EN-25
5.7.3 User Name ....................................................................................................................................... EN-25
5.7.4 Project Name.................................................................................................................................... EN-25
5.8 Factory Reset....................................................................................................................................... EN-26
5.9 Lockout................................................................................................................................................. EN-26
6. LEGAL FOR TRADE LFT ........................................................................................EN-27
6.1 Settings ................................................................................................................................................ EN-27
6.2 Verification ........................................................................................................................................... EN-27
6.3 Sealing ................................................................................................................................................. EN-28
7. PRINTING ......................................................................................................................EN-29
7.1 Connecting, configuring and Testing the Printer / Computer Interface ............................................... EN-29
7.2 Output format ....................................................................................................................................... EN-30
7.3 Printout Examples................................................................................................................................ EN-30
8. MAINTENANCE.............................................................................................................EN-32
8.1 Calibration............................................................................................................................................ EN-32
8.2 Cleaning............................................................................................................................................... EN-32
8.3 Troubleshooting ................................................................................................................................... EN-32
8.4 Service Information .............................................................................................................................. EN-33
9. TECHNICAL DATA........................................................................................................EN-34
9.1 Specifications....................................................................................................................................... EN-34
9.2 Drawings and Dimensions ................................................................................................................... EN-42
9.3 Accessories.......................................................................................................................................... EN-43
9.4 Communication .................................................................................................................................... EN-43
9.4.1 Interface Commands........................................................................................................................ EN-43
9.4.2 RS232 (DB9) Pin Connections ........................................................................................................ EN-45
10.SOFTWARE UPDATES.................................................................................................EN-45
11.COMPLIANCE ...............................................................................................................EN-46

EN-4 PR Series Balance
2. INSTALLATION
2.1 Unpacking
Carefully remove your PR balance and each of its components from the package. The included components vary
depending on the balance model. Save the packaging to ensure safe storage and transport. Please read the
manual completely before installing and using the PR balance to avoid incorrect operation.
Components included:
Balance
Power adapter + Attaching plug
Stainless steel pan
Pan support (for 0.1 g / 0.01 g model only)
Warranty card
2.2 Select the Location
Avoid heat sources, rapid temperature changes, air current or excessive vibrations. Allow sufficient space.
2.3 Leveling
Be sure the balance is level before it is used or after
its location is changed.
The PR balance has a level bubble in a small round
window beside the display.
To level the balance, adjust the 2 leveling feet until
the bubble is centered in the circle.
Please refer to the right figure for leveling.
2.4 Connecting Power and Acclimatising the Balance
Connect the DC output connector to the power receptacle on the rear of the balance. Then connect the AC adapter
plug to a suitable electrical outlet.
Acclimatising
It is suggested that the balance should not be used until it has been connected to power and acclimatised to the
environment for a certain period of time. In the case of a balance with the precision above 0.1 mg, the
acclimatisation time should be 1.5 hours; in the case of balance with the precision of 0.01 mg, the acclimatisation
time should be more than 4 hours.

PR Series Balance EN-5
2.5 Connecting the Interface
T
he PR balance has a RS232 port.
Use the RS-232 port to connect either to a computer or a printer with a standard (straight-through) serial cable.
Interface connections on the rear of the balance
RS232 Used to connect to PC or Printer
Note: See the Printing section for Connecting, Configuring and Testing the Printer / Computer Interface.
2.6 Initial Calibration
When the PR balance is first installed, or when it is moved to another location, it must be calibrated to ensure
accurate weighing results. PR balances are classified into two categories, InCal models and ExCal models. InCal
models have a built-in calibration mechanism which can calibrate the balance automatically and does not require
the use of external calibration masses. If preferred, InCal models can also be manually calibrated with external
masses. ExCal models are calibrated with external masses. Make sure to have the appropriate calibration masses
available before beginning calibration.
RS232

EN-6 PR Series Balance
3. OPERATION
3.1 Overview of Controls and Display
CONTROLS
CONTROL FUNCTIONS
Button
Primary
Function
(Short
Press)
On / Zero
If the balance is Off,
turns on the
balance.
If balance is On,
sets zero.
Print
Sends the current
displayed value to
the serial interface.
Function
Operation is
dependent on the
application mode.
Tare
Performs tare
operation.
Secondary
Function
(Press and
Hold)
Off
Zeroing current
value.
Unit
Changes weighing
units.
Mode
Changes
application mode.
Menu-Cal
Enters the main
menu.
Calibration is
the first sub-
menu.
Views the preset
Tare value.
Menu
Function
(Short
Press)
Yes
Accepts the current
(blinking) setting on
the display.
No
Rejects the current
(blinking) setting
on the display.
Increments a value
being entered.
Back
Reverts back to
previous menu
item.
Decrements a
value being
entered.
Exit
Immediately
exits the sub-
menu.
Aborts a
calibration in
progress.

PR Series Balance EN-7
MAIN APPLICATION SCREEN
3.2 Principal Functions
Weighing: First press Zero to set the display to zero. Place an object on the pan. The display indicates the gross
wei
g
ht.
Taring: With no load on the pan, press Zero to set the display to zero. Place an empty container on the pan
and press Tare. Add objects to the container and its net weight is displayed. After the container and
the ob
j
ects are removed, the load will be dis
p
la
y
ed as a ne
g
ative number. Press Tare to clear.
Zero: Press Zero to zero the balance.
3.3 Overview of Parts and Features Draft Shield Models
3.4 Overview of Parts and Features Non-Draft Shield Models
Result Field: depending on
application
Net (NET)
Stability (*)
Negative (-)
Centre of zero (>0<)
Pre-tare
(
PT
)
Unit
Pan
Level Indicator
2 Adjustable Feet RS232 Security
Lock Hole Power Input
2 Adjustable Feet
Pan
Level Indicator
RS232 Security
Lock Hole Power Input

EN-8 PR Series Balance
4. APPLICATIONS
The PR balance can be operated in 3 application modes by long pressing the Function / Mode button.
4.1 Weighing
Note: Before using any application, be sure the balance has been leveled and calibrated.
Use this application to determine the weight of items in the selected unit of measure.
Weighing
1. Press Tare or Zero if necessary to begin.
2. Press and hold the Function / Mode button to select
(this application is the default).
3. Place objects on the pan to display the weight. Once the
reading is stable, the * will appear.
4. The resulting value is displayed in the active unit of measure.
Item Settings
To view or ad
j
ust the current settin
g
s.
Weighing Units: Change the displayed unit. See Section 5.4 for the detailed processes.
Filter Level: Change Filtering level. See Section 5.3.1 for more information.
GLP Data: See Section 5.7 for more information.
Print Settings: Change printing settings. See Section 7 for more information.
4.2 Parts Counting
Note: Before using any application, be sure the balance has been leveled and calibrated. The minimum piece
weight should be no less than 0.1d. In the LFT mode, the minimum piece weight is 3e, the minimum Sample Size
is 10.
Use this application to count samples of uniform weight.
Parts Counting
1. Press Tare or Zero if necessary to begin.
2. Press and hold the Function / Mode button until
appears.

PR Series Balance EN-9
3. After confirmation by pressing Yes, the message
will appear on the screen.
4. Press Yes, and the message will display with the
numeral (default) flashing. The user can press No or
Back to increase or decrease the value.
For instance, to increase the value to 15, please press No.
Then, and will flash simultaneously.
4. Place 15 samples on the pan. Press the Function / Mode
button so that the weight of the 15 samples is used to
establish the average piece weight (APW). The display will
show pieces.
5. Remove the 15 samples from the pan and then place
additional samples on the pan. The corresponding number
of pieces will display on the screen.
6. To view the total weight or the number of pieces of the
objects, press the Function / Mode button.

EN-10 PR Series Balance
Item Settings
To view or adjust the current settings.
Sample size: The sample size ranges from 1 to 100. The default
value is 10.
Note: If the APW of the last parts counting operation needs to be
kept, the user can press No when the display shows the message
(clear the average piece weight. Place additional objects on
the pan, and the corresponding number of pieces will display.
APW Optimization:
Improving counting accuracy by re-calculating the piece weight
automatically as parts are added.
APW Optimization occurs only when the number of pieces added to
the pan is between one and three times the number already on the
pan.
Print Settings:
Changing printing setup. See Section 7 for more information.
4.3 Percent Weighing
Note: Before using any application, be sure the balance has been leveled and calibrated.
Use Percent Weighing to display the weight of a test object as a percentage of a pre-established reference
sample.
Note: The minimum reference weight should be no less than 0.1d.
Percent Weighing
1. Press and hold the Function / Mode button until
appears.
2. After confirmation by pressing Yes, the message
(clear the reference) will appear on the screen.

PR Series Balance EN-11
3. Press Yes, and (put the reference weight) will
display.
4. Place the reference sample on the pan to display the weight.
When the reading is stable, the * appears.
5. Press the Function / Mode button so that the weight of the
reference sample is stored in memory. The display will show
%.
6. Remove the reference sample, and place the test object on
the pan. The ratio of the test object to the reference sample
weight is displayed as a percentage.
7. To view the reference sample weight or the percentage of the
test object weight to the reference sample weight, press the
Function / Mode button.
8. To establish a new reference sample weight, long press the
Function / Mode button and repeat the steps described
above.
Item Settings
Note: If the reference weight of last Percent Weighing operation
needs to be kept, press No when the message (Clear
reference) displays.

EN-12 PR Series Balance
Printing Setup:
Changing printing setup. See Section 7 for more information.
4.4 Additional Features
Weigh Below
Note: Ensure the balance has been leveled and calibrated.
The PR balance is equipped with a weigh below hook for weighing below the balance (as shown below).
Before turning the balance over, remove the pan and draft shield elements (if present) to prevent damage. Do not
place the balance on the pan support cone or load cell pins.
To use this feature, remove power from the balance, then remove the protective cover for the weigh below
opening.
Power on the balance, and then use a string or wire to attach items to be weighed.
Weigh below
protective cover Weigh below hook

PR Series Balance EN-13
5. MENU SETTINGS
5.1 Menu Navigation
Calibration Setup Unit RS232 Print GLP Reset Lock
InCal Filter Level Gram Baud Rate Stable Only Header 1 Reset All Calibration
Cal Adjust AZT Kilogram Parity Numeric Only Header 2 Setup
Span Cal Auto Tare Milligram Handshake Single Header Header 3 RS232
Linearity Cal Graduations Carat Auto Print Balance
Name Print
Date Format Pound Header User
Name GLP
Date Setting Ounce Date and Time Project
Name Reset
Time Format Ounce Troy Balance ID
Time Setting Penny
Weight*Balance Name
Brightness Newton User Name
Auto Dim Grain Project Name
LFT TW Tael Application
Name
Custom 1 Result
Gross Weight
Net Weight
Tare Weight
Signature Line
Line Feed
5.1.1 Changing Settings
To change a menu setting, navigate to that setting using the following steps:
Enter the Menu
Long press the Menu button to enter the Menu.
Select the Sub-Menu
Press No to step between the sub-menus, and press Yes to enter the sub-menu.
Select the Menu Item
Press No to step through the Menu Items, and press Yes to enter the displayed Menu Item.

EN-14 PR Series Balance
5.2 Calibration
PR balances offer a choice of three calibration methods: Internal Calibration (for InCal models only), Span
calibration and Linearity Calibration.
Attention: Do not disturb the balance during any calibration.
5.2.1 Calibration Sub-menu (InCal models)
Note: ExCal models only have Span Calibration and Linearity Calibration.
5.2.2 Internal Calibration (not applicable to ExCal models)
Calibration is accomplished with the internal calibration mass. Internal Calibration can be performed at any time,
provided the balance has warmed up to operating temperature and is level.
With the Balance turned On and no load on the pan, press the Tare / Menu-Cal button enter into the internal
calibration setting. Or press the Tare / Menu-Cal button and select to initiate the internal calibration.
Set the internal calibration functionality.
Incal
On = enabled
Off = disabled.
Incal = initiate the internal calibration
on off Incal
The screen shows the status, and then press any button to return to the current application after calibration.
5.2.3 Cal Adjust (not applicable to ExCal models)
Use this calibration method to fine tune the effect of the Internal Calibration.
Calibration Adjust may be used to adjust the result of the Internal Calibration by +100 divisions.
Note: Before making a calibration adjustment, perform an Internal Calibration. To verify whether an adjustment is
needed, place a test mass equal to the span calibration value on the pan and note the difference (in divisions)
between the nominal mass value and the actual balance reading. If the difference is within +/- division, calibration
adjustment is not required. If the difference exceeds +/-1 division, calibration adjustment is recommended.
Example:
Expected weight reading: 200.000g (Test mass value)
Actual weight reading: 200.014g
Difference in grams: 0.014g
Difference in divisions: 14 (InCal Adjust value)
To perform a Calibration Adjustment, select InCal Adjustment from the list of Calibration Menu; enter the value
(positive or negative divisions) to match the difference noted earlier in the procedure.
Recalibrate using Internal Calibration. After calibration, place the test mass on the pan and verify that the mass
value now matches the displayed value. If not, repeat the procedure until Internal Calibration reading agrees with
the test mass.
5.2.4 Span Calibration
Span calibration uses two calibration points, one at zero load and the other at specified full load (span). For
detailed calibration mass information please refer to the specification tables in the "Span Calibration Points",
SPECIFICATIONS, Section 9.

PR Series Balance EN-15
With the balance turned On and no load on the pan, Span Calibration can be performed. The best accuracy is
achieved using the mass closest to the full span value.
Steps for span calibration
1. Press and hold the Tare / Menu-Cal button, and the
Calibration Menu will display.
2. Press Yes to enter the Calibration Menu.
3. To change the calibration mode, press No until (span
calibration) is displayed.
4. The calibration mass value will be shown in the screen. After
the display shows g, please place weight(s) of 200
g on the pan for calibration. To change to the calibration
point of half full capacity (e.g. 100 g), press the Function /
Mode button. If 0.0000 g is displayed, please take away the
mass.
5. Once the span calibration is completed successfully,
will display.
Press any button to return to the previous screen.
6. Remove the weight, and the reading will be set to zero.
5.2.5 Linearity Calibration
Linearity calibration uses three calibration points, one at zero load and the others at specified loads.

EN-16 PR Series Balance
With no load on the balance, press Linearity Calibration to begin the process.
The balance captures the zero point, and then prompts for the next weight.
Continue to follow the instructions on the display until the calibration is completed.
Steps for linearity calibration
1. Press and hold the Tare / Menu-Cal button, and the
Calibration Menu will display.
2. Press Yes to enter the Calibration Menu.
3. To change the calibration mode, press No until
(linearity calibration) is displayed.
4. The calibration mass value will be shown in the display. After
the display shows g, please place weight(s) of 100
g on the pan for calibration.
5. Remove the weight of 100 g from the pan. After a while,
g will be displayed on the screen. Please place
weight(s) of 200 g on the pan.
6. Once the linearity calibration is completed successfully,
will display.
Press any button to return to the previous screen.
7. Remove the weight, and the reading will be set to zero.

PR Series Balance EN-17
5.3 Balance Setup
Enter this sub-menu to customize the balance functionality.
Note: The factory default settings are shown below in bold.
5.3.1 Filter Level
Set the amount of signal filtering.
Low = faster stabilization time with less stability.
Medium = normal stabilization time with normal stability.
High = slower stabilization time with more stability.
Low Medium High
5.3.2 AZT (Auto Zero Tracking)
Set the automatic zero tracking functionality.
Auto Zero Tracking
Off = disabled.
0.5d = display maintains zero up to a drift of 0.5 graduation per second.
1d = display maintains zero up to a drift of 1 graduation per second.
3d = display maintains zero up to a drift of 3 graduations per second.
0.5 d 1 d 3 d
5.3.3 Auto Tare
Set the automatic tare.
When Automatic Tare is set to On, the first object placed on the pan will be deemed as a container and tared
automatically.
Off = disabled.
On = enabled.
Auto Tare Off On

EN-18 PR Series Balance
5.3.4 Graduations
Set the displayed readability of the balance.
1 Division = standard readability.
10 Divisions = readability is increased by a factor of 10.
For example, if the standard readability is 0.01 g, selecting 10 Divisions will result in a reading of 0.1 g.
Graduation 1 Division 10 Division
5.3.5 Date Format
Set the current date format.
Date Format:
YY/MM/DD
MM/DD/YY
DD/MM/YY
Date Format MM/DD/YYYY
DD/MM/YYYY YYYY/MM/DD
5.3.6 Date Setup
Set the current date in the desired date format.
To set the current date, press No or Back to increase or decrease the
value. Date
For example, if the current date is 22
nd
June, 2017,
MM/DD/YY 06.22.17
DD/MM/YY 22.06.17
YY/MM/DD 17.06.22
5.3.7 Time Format
Set the time format.
Time Format:
24hr
12hr
Time Format 24hr 12hr