Oakton 35616-00 User manual

pH/mV/°C meter
with RS-232 and Recorder output
9
6
±
8
5
2
0
7
4
1
•
ON/OFF
SHIFT
YES
NO
CAL
MEAS
MODE HOLD SETUP
REL MV
BASE
SET TEMP
OFFSET
SLOPE
RESLN
ACTIVATE
SET
TIMER
ALARM
READY
CAL EDIT
BEEP
MR
OPTIONS
MI
OPTIONS PRINT
OPTIONS
3
pH/mV/RelmV/°CBenchtopMeters
and
pH/mV/Ion/°CBenchtopMeters
35616-00
35616-03
35616-05
35616-08
35616-01
35616-02
35616-06
35616-07
35620-10
35620-13
35620-15
35620-18
35620-11
35620-12
35620-16
35620-17
1200 ©2000
70149
Modelnumbers:

2

Tableofcontents
1. Introduction...............................................................................................................................................................................4
2. Keypad functions................................................................................................................................................................5–8
• Primary keys • Secondary keys • Numeric keys
3. Starting up the meter......................................................................................................................................................9–10
• Back panel connections • Turning the meter on and off
4. pH calibration......................................................................................................................................................................11–12
• 1-point calibration • 2-point calibration (up to 5-point)
5. Relative mV calibration..........................................................................................................................................................13
6. Ion calibration...........................................................................................................................................................................14
7. Measurement: Ready, continuous, hold......................................................................................................................15-16
8. Measuring pH...........................................................................................................................................................................17
9. Measuring mV...........................................................................................................................................................................17
10. Measuring Relative mV..........................................................................................................................................................18
11. Measuring Ion Concentration..............................................................................................................................................19
12. Automatic temperature compensation (ATC) and manual temperature compensation..................................20
13. Setup functions and setup keys..................................................................................................................................21-25
• General • Setup functions at a glance • Program 1: viewing previous pH calibration data
• Program 2: selecting meter operations (Reset and Auto-off) • Program 3: setting clock functions
• Program 4: Selecting communication (RS-232) data
14. Switching the pH resolution...............................................................................................................................................26
15. Setting the READY indicator..............................................................................................................................................27
16. Setting the audible beep......................................................................................................................................................28
17. Checking offset.......................................................................................................................................................................29
18. Checking slope.........................................................................................................................................................................29
19. Setting the high and low pH setpoint alarm.................................................................................................................30
20. Setting and activating the timer........................................................................................................................................31
21. Memory input functions and options.......................................................................................................................32-33
22. Memory recall functions and options..............................................................................................................................34
23. Setting up the optional printer and RS-232 output.............................................................................................35-51
• Using the meter with a printer • Connecting the cable to the meter • Connecting the cable to the printer
• Using the meter with a printer to download stored memory • Print function and options
• Using the meter with a computer and the Datalog Assist Software (DAS)
• Loading the Data Acquisition Software • DAS main menu options
• DAS data file management (continuous logging; downloading meter memory)
• DAS functions • Exiting DAS
24. pH electrode care and maintenance.........................................52-53
25. Error messages.....................................................................................54
26. Troubleshooting guide .........................................................................54
27. pH buffer/temperature table.............................................................55
28. Specifications......................................56
29. Accessories...........................................57
30. Warranty ...............................................58
31. Return of items...................................58
warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
keypad
functions
introduction
3
Quick tip
let the mini table of contents in the outer
margins of this manual guide you instantly
to the right section!

warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
keypad
functions
introduction
4
pH/mV/°C meter
with RS-232 and Recorder output
9
6
±
8
5
2
0
7
4
1
•
ON/OFF
SHIFT
YES
NO
CAL
MEAS
MODE HOLD SETUP
REL MV
BASE
SET TEMP
OFFSET
SLOPE
RESLN
ACTIVATE
SET
TIMER
ALARM
READY
CAL EDIT
BEEP
MR
OPTIONS
MI
OPTIONS PRINT
OPTIONS
3
1.Introduction
Thank you for selecting the OAKTON®pH/mV°C meter or
OAKTON pH/mV/Ion/°C meter. This manual provides
instructions for the 35616- and 35620-series meters.
Each section includes illustrations that show you which but-
ton to press for each major function.
Gettingstarted(sections2through12)
To perform the basic functions of this meter, read sections
2 through 12 of this manual. These sections include basic
instructions (about keypad functions, connecting the
electrodes, calibration, measuring, etc.) that will get you
up and running quickly. These sections are indicated in the
outer margins as Starting Up, Calibration, Measurement, and
Temperature.
Advancedfunctions(sections13 through22)
To perform the advanced functions of this meter, read
sections 13 through 22 of this manual. Advanced functions
include the setup programs (“Auto-Off”, setting the time
and date, memory clear and reset, selecting RS-232
parameters, etc.), setting the high and low point alarms,
memory input and recall, and other special features that
will let you fine tune the efficiency of your meter. These
sections are indicated in the outer margins as Setup
Functions, Offset/Slope, Alarm/Timer, and Memory
Input/Recall.
RS-232/printeroutput(section23)
To setup the parameters for RS-232 and printer output,
read section 23 of this manual. This section applies
only to meters with RS-232/printer capability.
Maintenance,troubleshooting,etc.(sections24through31)
The remaining sections of the manual deal with electrode
maintenance, error messages, and troubleshooting. This
part of the manual also includes specifications, accessories,
warranty, and return of items.

keypad
functions
warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
introduction
5
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
A
B
To perform secondary functions:
A. press SHIFT key to access
secondary function
B. press specific key for that function
(example: the SET TEMP/OFFSET
button's secondary function is to
display the offset of the pH electrode)
Figure 1 above shows primary display
(here displaying pH) and secondary
display (shows temperature).
2.Keypadfunctions
The large membrane keypad makes the instrument easy to
use. Each button, when pressed, has a corresponding
graphic indicator on the display. While in the measurement
function, the primary display shows the readings for pH, rel-
ative mV, mV and Ion Concentration. The secondary display
shows the temperature readings simultaneously with the
primary display (Figure 1)
NOTE: The secondary display shows “Ion”(not tempera-
ture) in Ion concentration mode.
The meter also has primary and secondary functions.
To perform primary functions, press the appropriate func-
tion key. During operation, the meter assumes the primary
functions are active.
To perform secondary functions, press SHIFT first, and
then the appropriate function key.
ON/OFF
Primary function: Powers the meter on or off. The meter
always starts-up in the pH measure (MEAS) mode. When
the meter is OFF, the display shows current time whenever
the AC adapter is plugged in.
Secondary function: None.
Numeric value: None.
SHIFT
Primary function: Press to perform secondary functions.
Secondary function: None.
Numeric value: None.
CAL/MEAS
Primary function: Press to toggle between the calibration
modes and measure functions. Also, exit from the setup
mode and secondary functions.
Secondary function: None.
Numeric value: None.
MEAS pH
°C
pH
Numeric key values
Some keys also have numeric values. Do
not press SHIFT to enter numeric values.
The instrument knows when to enter
a numeric value (for calibration, setting
temperature, etc.). and when to activate
a primary or secondary function.

YES
Primary function: Enter numeric values, con-
firm calibration points, or confirm and scroll the
program options in setup mode.
Secondary function: None.
Numeric value: None.
NO
Primary value: Use to cancel an incorrectly
selected numeric value.
Secondary function: None.
Numeric value: None.
MODE
Primary value: Selects the four measurement modes: pH, mV, relative mV, and Ion Concentration.
Secondary function: None.
Numeric value: 1.
HOLD
Primary value: Freezes the displayed value and displays the HOLD annunciator. Press the key again
to release display. HOLD is active only in Measurement mode. While in Hold mode, you can press
PRINT to print, or MI to store values.
Secondary function: None.
Numeric value: 2.
SETUP/RELMVBASE
Primary function: Lets you enter Setup mode. Lets you customize most the functions of the instru-
ment. Setup mode options are described in section 13, page 21-25.
NOTE: select CAL/MEAS anytime to exit from the setup mode.
Secondary function: Displays the rel mV base for two seconds, then meter automatically resumes
normal operation. Value displays in primary field of LCD. To change the rel mV base, enter the rel mV
mode and press CAL: see page 13 for full instructions. Press SHIFT + MV BASE.
Numeric value: 3.
▲ /RESLN
Primary function: Selects the next higher buffer in pH calibration mode. Also use to scroll through
setup mode options.
Secondary function: Switch resolution of measured pH. Automatically toggles from 0.01 to 0.1, or
0.1 to 0.01. Press SHIFT + RESLN.
NOTE: In the mV, relative mV, and Ion concentration modes, the meter automatically displays the
highest resolution possible up to 31⁄2digits.
Numeric value: 4.
▼ /SLOPE
Primary function: Selects the next lower buffer in the pH calibration mode. Also use to scroll
through setup mode options.
Secondary: Displays percentage slope of the pH electrode (pH mode), or slope in mV per tenfold
increase of ion concentration (Ion mode). Percentage slope is calculated as the average of the seg-
ments between the calibrated points. Value displays for two seconds before the meter reverts to its
normal display.
Press SHIFT + SLOPE.
Numeric value: 5.
warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
keypad
functions
introduction
6
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS

SETTEMP/OFFSET
Primary function: Press to calibrate ATC temperature probe or to set manual temperature.
Enter desired temperature value with numeric keys. Then press YES to confirm the value, or NO
to reenter the value. Press CAL/MEAS to exit Set Temp mode.
NOTE: This key is active only in the Measurement mode.
Secondary function: Displays the offset of the pH electrode connected to the meter in mV. After two
seconds, the meter automatically returns to Measurement mode.
Press SHIFT + OFFSET.
Numeric value: 6.
CALEDIT/BEEP
Primary function: Active in pH and Ion calibration mode only. Press this key to enter a customized pH
buffer value. Enter the buffer value with the numeric keys. Press YES to accept, confirm, and exit cali-
bration. Press NO to re-enter the value.
Secondary function: Turns on or off beep you hear when pressing the keypads. Press SHIFT + BEEP.
Numeric value: 7.
ALARM/READY
Primary function: Enter the high and low alarm values. Depending on the instrument mode, you can
enter the high and low alarm limits for mV, rel mV, and pH. Enter the values with the numeric keys, and
then press YES to confirm or NO to re-enter the values. If the measured value is not within the low and
high alarm limits, the instrument will emit three beeps. To turn off the alarms, press +/- twice in alarm
setting function. Alarms are active only in the measurement function.
NOTE: You cannot set Ion Concentration alarms.
Secondary function: Turns on or off the ready function. The meter toggles automatically between on or
off, and then automatically resumes normal operation. Press SHIFT + READY.
Numeric value: 8.
ACTIVATE/SETTIMER
Primary function: Press to start time countdown. After reaching the set time interval, the meter beeps
continuously and holds last measured reading on the LCD. Press any key to resume normal operation.
Secondary function: Sets the timer interval. Meter displays the last set value. The first two digits are
hours and the next two digits are minutes. Minimum timer value is one minute. Maximum timer value is
23 hours and 59 minutes. When you enter time and press YES, the meter will confirm the entered value
or prompt for re-entry if confirmation failed. Press SHIFT + SET TIMER.
Numeric value: 9.
MI/OPTIONS
Primary function: Stores the displayed value in memory. The meter can store up to 16 measurements
along with corresponding temperature measurements. You can store any combination of pH, mV, rela-
tive mV, or Ion measurements. This function is active in the measurement and hold functions only.
NOTE: Ion concentration values are stored as mV values; meters with direct concentration mode
store up to 13 value sets in memory.
Secondary function: Set the different data logging modes that automatically store displayed values in
memory. The MEM annunciator appears. Press SHIFT + MI/OPTIONS. There are two options.
Data log on ready (when reading is stable): Current selection will display READY and
ON/OFF. Use ▲or ▼to alter. Press YES to confirm selection and go to the next selection.
Set time interval for data log. Current time interval will be displayed first (if there is no time
interval set, the display reads “- - - -”). To change the time interval, use the numeric keys. To
clear an existing value, press +/–. Press NO to re-enter the value; press YES to accept the
value and exit.
NOTE: Minimum = 1 minute. Maximum = 23 hours, 59 minutes.
Numeric value: Decimal point.
warranty/
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specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
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electrode
care and
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RS-232
memory
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alarm/
timer
resolution/
READY/offset/
slope
setup
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temperature
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functions
introduction
7

MR/OPTIONS
Primary function: Recall stored values, in last-in-first-out sequence. The meter displays recalled
values according to the current mode. If there are no stored values in memory, the ERR annunciator
appears.To recall all stored values, press MR repeatedly. To exit from MR mode, press CAL/MEAS.
In the MR mode, you can also select PRINT to send recalled values to the RS-232 output. Active only
in the measurement function.
Secondary function: Output values stored in memory, and clear the stored values from memory.
Press SHIFT + MR/OPTIONS.
This function group contains two options.
1. Output all memory data to printer or computer: The meter first displays the current selec-
tion. Use ▲or ▼to change the selection to on or off. If you select on to output data, the
instrument will send all memory data through the RS-232/printer output. Press YES to confirm
the selection (on or off) and go to the next option.
2. Clear memory: Press ▲or ▼to turn on or off the memory clear function. If you select on
to clear memory, the meter will erase all the stored values. Press YES to enter the selection (on
or off) and return to Measurement mode.
Numeric value: 0.
PRINT/OPTIONS
Primary function: Lets you output data through
the serial port. You can select baud rate, parity,
and stop bits in the Setup function. See page 25
for directions. You can access PRINT from the
Measurement, Hold, or Memory recall functions.
The printer icon will appear on the display.
Secondary function: Set the different output
modes. Press SHIFT +PRINT/OPTIONS.
There are two options.
Print on ready: The current selection will
appear on the display (READY). Press
▲or ▼to turn “Print on Ready” on or off.
If you select on, the meter will send dis-
played data through the RS-232 output when the value is stable (when the ready indicator
lights). Press YES to confirm the selection and go to the next selection.
Print on time interval: Current time interval will be displayed first (if there is no time
interval set, the display reads “- - - -”). To change the time interval, use the numeric keys. To
clear an existing value, press +/–. Press NO to re-enter the value; press YES to accept the
value and exit.
NOTE: Minimum time interval = 1 minute; Maximum time interval = 23 hours, 59 minutes
Numeric value: +/–.
warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
keypad
functions
introduction
8
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS

3.Startingupthemeter
Backpanelconnections
See Figure 2 above.
Connect the DC adapter from an AC power source to
the power jack (DC).
Connect a combination pH electrode to the BNC input
connector (INPUT). The meter can accept any pH, ORP, or
ISE electrode with a BNC connector. Make sure the con-
nector is clean and dry.
If you are using half-cells or the combination U.S.
Standard electrode, connect the measuring half-cell
to the BNC connector (INPUT) and the reference
half-cell to REF.
Connect an automatic temperature compensation
electrode to the Input jack marked ATC. Temperature
compensation is manual when the ATC probe is
disconnected. To calibrate for manual temperature
compensation, see section 12, page 20.
Connect your recorder to the jack on the meter (REC).
Connect a computer or printer to the RS-232 serial
port. See section 23, pages 38-51, for additional
information about the RS-232 function.
Figure 2 above shows the back panel
connections of the pH meter.
From left to right:
• ATC input jack
• input for BNC connector
• connector for reference half-cell
• jack for recorder
• ground
• RS-232 serial port
• DC power jack
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introduction
9
ATC INPUT REF REC GND RS232 DC
Grounding
Grounding is not necessary for most laboratory
applications. However, industrial applications
such as electroplating do require grounding.
If you have any questions about ground
connection, contact your OAKTON distributor.

Turningonandoffthemeter
As soon as you attach your DC power adapter to the
meter, the meter will beep. Then, the display will show a
diagnostic test of all the readouts for a few
seconds(Figure 3). The display will then immediately
show the time (Figure 4).
To access the meter functions, press ON/OFF. The
meter will beep, the display will show another diagnostic
test, and then open in the pH Measurement mode.
See section 4, pages 11–14, to begin calibration.
To turn off the meter, press ON/OFF. The display will
again show the diagnostic test, and then show a date and
time. Remove the power adapter from the DC jack, and
the date and time will go off.
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
Figure 3
As soon as you attach power adapter,
the meter will display a diagnostic test
of all readouts for a few seconds.
warranty/
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accessories
pH buffer
temperature
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electrode
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RS-232
memory
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alarm/
timer
resolution/
READY/offset/
slope
setup
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temperature
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starting up
keypad
functions
introduction
10
SETUP
READY
HOLD
ERR
MEAS CAL CON MEM
pH
Rel
mV
pH
°C
ATC
pH mVTemp Rel
ON
OFF
Figure 4
The display will then
immediately show time.
Press ON/OFF to begin
working with your pH meter.
Quick tip
Turn to section 13, page 24 to see how to set
the current date and time on your meter

4.pHcalibration
This instrument stores up to 5 calibration points
to ensure accuracy. You can perform 5-point
calibration in any order with standard pH
buffers: 1.68, 4.01, 7.00, 10.01, and 12.45.
This meter features auto buffer recognition
at these 5 values for faster calibration.
Or, you can enter your own custom pH buffer
values (see step 5 below for instructions).
DO NOT REUSE SOLUTIONS AFTER
CALIBRATION. Contaminants in the solution can affect
the calibration, and eventually the accuracy of the mea-
surements. If, however, the accuracy of an application is
less stringent, you can keep the solution in a PVC con-
tainer that is stored in a cool, dark place. All new calibra-
tions will over-ride existing stored calibration data. To
erase calibration values in memory, use the SETUP
mode. See section 13, page 24.
For1-pointpHcalibration
1. Turn the meter on. The meter automatically enters pH
measurement mode when meter is switched on.
2. Rinse the electrode thoroughly with deionized water or a
rinse solution. DO NOT WIPE THE ELECTRODE; this
causes a build-up of electrostatic charge on the glass
surface.
3. Dip the electrode into the standard pH 7.00 buffer
(or the buffer value closest to your expected value of
the sample).
4. Press CAL/MEAS and the display will show CAL. The
primary display will show the measured reading while the
smaller secondary display will automatically indicate
the pH 7.00 (or other value) standard buffer solution
(Figure 5). If necessary, use the ▲and ▼keys to
select other standard pH buffer values.
5. If using a non standard pH calibration buffer, press
CAL EDIT to enter the exact value of the pH buffer.The
annunciator in the lower left of the display will flash.
Press the numeric keys to enter your non standard pH
buffer value (the value will appear in the secondary dis-
play). Press YES to confirm. Skip to step 8. If you make a
mistake, press NO and the secondary display will reset to
the original value and allow you to enter the value again.
6. Wait for the measured pH value to stabilize. The
READY indicator will display when the reading stabilizes.
(If the READY indicator is not activated, see section 7,
page 16).
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pH buffer
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electrode
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RS-232
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alarm/
timer
resolution/
READY/offset/
slope
setup
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measurement
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starting up
keypad
functions
introduction
11
Figure 5
Primary display (top) shows the
measured reading; secondary display
(bottom) shows pH standard buffer
solution (pH 1.68; 4.01; 7.00; 10.01;
12.45). You can select a non-standard
calibration point—see step 5.
CAL pH
pH
pH
Calibrating tip
For best results, perform at least a 2-point
calibration using standard buffers that bracket
(one above and one below) the expected
sample range. A 1-point calibration can also
be used, but make sure that the buffer value is
close to the sample value being measured.
Calibration Tip: Acceptable Custom
Calibrarion points
You can only program one value
(preprogrammed or custom) per range.
For example, if you calibrate to pH 7.00
and then to pH 6.00, the 6.00 calibra-
tion will replace the 7.00 calibration.
Range Preprogrammed Custom
pH Value pH Value
1 1.68 0.68-2.68
2 4.01 3.00-5.00
3 7.00 6.00-8.00
4 10.00 9.00-11.00
5 12.45 11.45-13.45

7. Press YES to confirm calibration. The CON indicator
blinks for one second and disappears (Figure 6).
The meter is now calibrated at the buffer indicated in the
primary display.
The secondary display automatically scrolls to the next
buffer calibration option. If you want to calibrate at another
point, go to “multi-point pH calibration” below. If not,
continue to step 8.
8. Press CAL/MEAS to return to measurement mode.
1-point calibration is now completed.
Formulti-pointpHcalibration(upto5points)
If your 1-point calibration began with the default buffer
value of pH 7.00, then the meter automatically scrolled up
to the next value, 10.01. The next value automatically
shown will be 12.45, then the meter will wrap around to
1.68, 4.01, and back again to 7.00.
1. To manually select the next buffer you wish to
calibrate, press the ▲and ▼keys to scroll through the
buffer selection options. The options are shown on the
secondary display (pH 1.68, 4.01, 7.00, 10.01, and
12.45).
2. Follow steps 2 through 7 of the 1-point calibration
instructions on pages 11-12. DO NOT do not press
CAL/MEAS until all calibration is completed.
3. Repeat steps 2 through 7 above until all buffer values
you want to use (up to 5 values) are entered. DO NOT
press CAL/MEAS until all calibration is completed.
4. Press CAL/MEAS to return to the measurement
function. Display now shows MEAS.
NOTE: You can view previous calibration data stored in
the meter with the Set-Up function. See page 23
for directions.
warranty/
return items
specifications/
accessories
pH buffer
temperature
tables
trouble
shooting/error
messages
electrode
care and
maintenance
printing/
RS-232
memory
input/recall
alarm/
timer
resolution/
READY/offset/
slope
setup
functions
temperature
measurement
calibration
starting up
keypad
functions
introduction
12
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
B
C
C-D
For pH calibration:
A. Dip electrode into buffer.
B. Press CAL/MEAS to enter CAL mode.
Primary display shows measured
reading; secondary display shows pH
standard buffer value.
C. If using a buffer other than the five
standard pH buffers, press CAL/EDIT
and enter numeric values to select
desired value.
D. Press YES to confirm calibration.
Figure 6
When you press YES to confirm
calibration, the CON indicator blinks.
CAL CON pH
pH
pH
OR indicator
The OR indicator blinks if the selected
buffer value is not within ±0.50 pH of
the measured pH value. The indicator
also flashes if the buffer used is not
the same as the buffer value on the
secondary display.

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13
5.RelativemV Calibration
1. While in the measurement function, press MODE to
enter relative mV mode. The primary display indicator
shows “Rel mV”. If you have never calibrated mV or if
the meter has been reset, the value shown is the same
as the absolute mV value. Once calibrated, the value
shown will be relative mV. The secondary display
shows the temperature ( Figure 7).
2. Press CAL. The calibration indicator shows on the
display. The rest of the display stays the same.
3. Press the numeric keys to adjust the displayed
mV value to the mV value to be subtracted from the
reading.
4. Press YES to confirm the calibration. The LCD will
now show the adjusted reading.
NOTE: If you press YES without entering an mV value
with the numeric keys, the meter will subtract
the entire reading value displayed—that is, it
will zero the mV reading. The LCD will then
show 0 mV.
The meter is now calibrated for relative mV
measurements.
When you press YES, the meter automatically returns to
the measurement mode. The primary display now shows
the relative mV readings.
TO RECALL THE SELECTED BASE VALUE,
press SHIFT and REL mV BASE.
TO ERASE CALIBRATION VALUES IN MEMORY,
use the SETUP function. See section 13, page 21.
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7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
A
B
D
Calibrating Relative mV
A. press MODE (if necessary) to enter
relative mV mode.
B. press CAL
C. press numeric keys to adjust
displayed mV value to the mV value
to be subtracted from reading
D. press YES to confirm calibration and
return to measurement mode.
Figure 7
Upon entering the relative mV mode,
the primary display shows either the
relative mV value (if already calibrated) or
the absolute mV value (if not calibrated
yet). The secondary display shows
temperature.
MEAS
Rel
mV
°C
mVRel

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14
Figure 8
In Ion Measurement mode, the primary
display (top) shows the ion concentra-
tion reading and the secondary display
(bottom) shows “Ion”.
READY MEAS
6.IonCalibration
This calibration is for models with direct concentration mode
only. For best accuracy, calibrate your meter to AT LEAST
two points with similar concentrations to the solutions you
want to test. You can calibrate up to five points.
1. Prepare at least two calibration standards in
accordance with the electrode instructions or your
approved methods. Bring the calibration standards to
ambient temperature.
2. If the meter is not on, plug it in and press the ON/OFF
button. The meter will be in pH Measurement mode.
3. Press the MODE button three times to switch to
Concentration Measurement mode. The word “Ion”
will be displayed in the secondary display (Figure 8).
4. Dip electrode in the first calibration standard. Make
sure to start with the calibration standard that has the
lowest concentration and move up to the standards that
have higher concentrations.
5. Press CAL/MEAS to enter Calibration mode. The
top display shows the mV value of the solution and the
bottom display shows “ 1,” indicating the first calibration
standard (Figure 9).
6. Allow the instrument sufficient time to stabilize*. Once
the display is stable, press CAL EDIT and then enter the
concentration value of the calibration standard. Use
the numeric keys to enter any number between
0 and 9999†. This number can indicate any units you
choose—make sure you use the same type of units you
want to view in Measurement mode.
7. Press YES to confirm the number you have entered,
or press NO to reenter the value.
8. Follow steps 4-7 for each of the next calibration
points. Make sure to rinse off the electrode with deion-
ized water before placing it in the next calibration standard.
9. When you have finished calibration, press CAL/MEAS
twice to return to Measurement mode. The top display
now shows the correct concentration value and the
bottom display shows “Ion”.
* Electrode response in low concentrations is much slower
than response in high concentrations or in pH mode.
Therefore, the READY indicator may come on prematurely.
Allow sufficient time to ensure the READY indicator is
genuine, or turn off READY indicator (see page 16).
†If you press the decimal point while entering the concentra-
tion value, you must enter all four digits. For example, if
you want to enter the value 10.00, either press 1, 0, YES,
or press 1, 0,. ,0, 0, YES.
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5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
B
CD
E
For Ion Calibration:
A. Dip electrode into calibration
standard.
B. Press MODE until you enter Ion
Concentration mode.
C. Press CAL/MEAS to enter CAL mode.
Primary display shows mV reading;
secondary display shows the number
of the calibration point.
D. Let electrode stabilize. Press CAL EDIT
and then enter concentration value.
E. Press YES to confirm concentration
value.
F. Repeat steps D and E with different
calibration standards until calibration
is complete. Then, press CAL/MEAS.
Figure 9
In Ion Calibration mode, the primary dis-
play (top) shows the ion concentration
reading in mV and the secondary display
(bottom) shows the number of the cali-
bration point (1-5).
CAL

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15
7.Measurement:
Ready,Continuous,andHoldfunctions
MeasuringwithREADYindicatoron.
The READY indicator appears on the top left corner of
the display when the reading is stable.
NOTE: see page 16 for directions on how to activate or
deactivate the ready indicator.
Before taking measurements, rinse the electrode with
deionized or distilled water. This will remove impurities
that have adhered to the electrode body. If the pH elec-
trode has dehydrated, soak it for 30 minutes in a 2M - 4M
KCl solution. If you have an ion selective electrode, refer
to its manual for proper electrode pretreatment.
1. After calibration, press CAL/MEAS to enter the
measurement function. The MEAS indicator shows on
the top center of the LCD. Use the MODE button to
choose pH, mV, relative mV or ion concentration mode.
2. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. Stir the electrode gently
to create a homogeneous sample.
3. When the reading is stable, the READY indicator
will display (Figure 10).
NOTE: The READY indicator is based on stability of the
mV output over time. At low ISE concentrations,
slow electrode response may lead to false READY
indications. Disregard or turn off the READY indi-
cator for low level ion measurements.
9
6
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8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
A
Measuring with READY mode
A. press CAL/Meas to enter
measurement function (if necessary).
B. Dip electrode into sample.
C. READY indicator shows when reading
has stabilized.
Figure 10
READY indicator displays when reading
has stabilized
READY MEAS pH
°C
pH
Electrode tip
During measurement, the electrode can be
hand-held or attached to an electrode
holder for more stable operation. Be sure
to remove the electrode’s protective rubber
cap before measurement.

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16
Measuringinthecontinuousmode
While the READY indicator assures stable readings, the
continuous mode provides instantaneous readings for
faster operation. Continuous mode readings, however,
are not as stable. To turn off the READY indicator:
1. Press the SHIFT button to access the secondary
function of the ALARM/READY key.
2. Press the ALARM/READY key to turn the Ready
function off. The display will read “ON“ or “OFF” to
indicate whether the READY indicator has been turned
on or off.
3. After calibration, press CAL/MEAS to enter the
measurement function. The MEAS indicator shows on
the top center of the LCD. Use the MODE button to
choose pH, mV, relative mV or ion concentration mode.
4. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. Stir the electrode gently
to create a homogeneous sample.
5. To turn the Ready function back on, press the SHIFT
button and then the ALARM/READY button.
Holdingareading(HOLDfunction)
This feature lets you freeze the value of the reading for a
delayed observation. HOLD can be used any time when
in MEAS mode.
1. To hold a measurement, simply press the HOLD key
once while in the measurement function. “HOLD” will
appear on the display (Figure 11).
2. To release the held value, press HOLD again.
Continue measurements.
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
A
B
C
Measuring in continuous mode:
A. press SHIFT button to access
secondary function of ALARM/READY
key.
B. press ALARM/READY to turn off the
ready function.
C. press CAL/MEAS to enter
measurement function (if necessary).
D. Dip electrode into sample.
E. press SHIFT button and ALARM/
READY button to turn the ready
function on again.
To freeze a reading:
A. Press HOLD button once while in
measurement function.
B. Press HOLD again to release.
HOLD
pH
°C
pH
Figure 11
Use the HOLD function to freeze
your reading.

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17
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
8.MeasuringpH
When you first turn on the instrument, the meter enters
directly into pH measurement mode.
1. After calibration, press CAL/MEAS to enter the
measurement function. The MEAS indicator shows on
the top center of the LCD.
2. Press the MODE button to choose the pH mode. The
“pH” indicator will appear at the bottom of the display.
3. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. Stir the electrode gently
to create a homogeneous sample.
4. The primary display will show the pH reading, and
the secondary display will show the temperature. If the
READY indicator is active, it will signal when the read-
ing is stable.
9.MeasuringmV
1. After calibration, press CAL/MEAS to enter the
measurement function. The MEAS indicator shows on
the top center of the LCD.
2. Press the MODE button to choose the mV mode. The
“mV” indicator will appear at the bottom of the display.
3. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. Stir the electrode gently
to create a homogeneous sample.
4. The primary display will show the mV reading, and
the secondary display will show the current tempera-
ture reading. If the READY indicator is active, it will sig-
nal when the reading is stable.
NOTE: Resolution is 0.1 mV within a ± 399.9 mV range,
and 1 mV up to ±1999 mV. If mV readings are out
of range, the display will show “Ur” or “Or” in
the primary display.
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
B
A
B
A
Measuring pH:
A. press CAL/MEAS button to enter
measurement function (if necessary).
B. press MODE button until meter is in
pH mode.
C. Dip electrode in sample.
D. READY indicator (if selected on)
shows when reading has stabilized.
Measuring mV:
A. press CAL/MEAS button to enter
measurement function (if necessary).
B. press MODE button until meter is in
mV mode.
C. Dip electrode in sample.
D. READY indicator (if selected on)
shows when reading has stabilized.

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18
10.MeasuringrelativemV
1. After calibration, press CAL/MEAS to enter the
Measurement function. The MEAS indicator shows on
the top center of the LCD.
2. Press the MODE button to choose the Relative mV
mode. The “Rel mV” indicator will appear at the bot-
tom of the display.
3. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. Stir the electrode gently
to create a homogeneous sample.
3. The primary display will show the Rel mV reading,
and the secondary display will show the temperature.
If the READY indicator is active, it will signal when the
reading is stable.
Once you enter Rel mV mode, the base value held in
memory (determined in “Calibrating Rel mV”; section 5,
page 13) is subtracted from the measured mV value. The
default setting for this base value is 0 mV.
To calibrate Relative mV (change the base value):
1. Press CAL/MEAS while you are in Relative mV
Measurement mode. The display will show CAL.
2. Use the numeric keys to enter the new base value.
3. Press YES to confirm the value and return to the
Calibration function. If you make a mistake, press NO
to clear and reenter the value.
4. Press CAL/MEAS to return to Measurement function.
All measurements will now be subtracted from the
new base value.
5. To recall the selected base value, press SHIFT and
REL mV BASE. The value will show for two seconds
and then return to the Measurement function.
9
6
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±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
B
A
Measuring relative mV:
A. press CAL/MEAS button to enter
measurement function (if necessary).
B. press MODE button until meter is in
rel mV mode.
C. Dip electrode in sample.
D. READY indicator (if selected on)
shows when reading has stabilized.
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
To change base value in relative mV:
A. press CAL/MEAS button so display
shows “CAL”.
B. use numeric keys to enter new value.
C. Press YES to confirm or NO to clear
and reenter.
D. Press CAL/MEAS to return to
measurement function.
Quick tip—Rel mV readings
If you have not calibrated the meter for
relative mV, your rel mV reading will be the
same as the standard mV reading.
A-D
C

11.MeasuringIonConcentration
1. After calibration, press CAL/MEAS to enter the
Measurement function. The MEAS indicator shows on
the top center of the LCD.
2. Press the MODE button to choose the Ion
Concentration mode. The secondary display will read
“Ion”.
3. Prepare samples as necessary (i.e., add Ionic
Strength adjuster). Sample preparation varies depend-
ing on ion type—see your electrode manual for details
on the specific electrode that you are using.
4. Dip the electrode into the sample. The sensor or
glass bulb of the electrode must be completely
immersed into the sample. For best results, use a
magnetic stirrer to ensure a homogenous sample.
5. The primary display will show the current Ion con-
centration reading, while the secondary display will
show the word “Ion”. If the READY indicator is active,
it will signal when the reading is stable.
NOTE: Temperature does not display in Ion Measurement
mode.
A. press CAL/MEAS button to enter
measurement function (if neces-
sary).
B. press MODE button until meter is
in Ion Concentration mode.
C. Dip electrode in sample.
D. READY indicator (if selected on)
shows when reading has stabilized.
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19
Ion tip
Concentration readings are not temperature
compensated. Try to avoid temperature
fluctuations in your standards and samples.
9
6
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±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
B
A

12.AutomaticTemperatureCompensation(ATC)
andManualTemperatureCompensation
Automatictemperaturecompensation
Automatic temperature compensation only functions in
the pH measurement mode when the temperature probe
is plugged into the meter.
1. For automatic temperature compensation (ATC),
simply plug in the temperature probe in the phone
jack (Figure 12). The ATC indicator will show on the
LCD. If the ATC indicator does not show, then the probe
is not connected to the meter or is faulty.
You should calibrate your temperature probe when you
replace it. To calibrate the temperature probe:
1. Plug the new temperature probe into the phone
jack on the back of the meter.
2. Place the temperature probe and a reference
thermometer in a water bath. Compare the
temperature reading on the meter to the temperature
reading on the reference thermometer.
3. Subtract the meter’s temperature reading from
the true temperature to find the required temperature
offset value.
4. Press the SET TEMP key to select temperature
calibration mode.
5. Press the numeric keys to set the desired tempera-
ture value. If you make a mistake, press NO to reset to
the original value, then reenter the desired value again.
6. Press YES to confirm selected temperature. The
display will return to its previous mode.
Manualtemperaturecompensation
You can select manual temperature compensation in the
pH mode. NOTE: Probe must be disconnected.
1. Make sure you are in the measurement function.
You can be in any mode (pH, mV, rel mV, or Ion). Press
SET TEMP to select temperature mode. TEMP is
displayed at the bottom of the display (Figure 13).
2. Press the numeric keys to set the desired tempera-
ture value. If you make a mistake, press NO to reset to
the original value, then reenter the desired value again.
3. Press YES to confirm selected temperature. The
display will return to its previous mode. The meter is
now prepared for temperature compensation without
the temperature probe.
For pH buffer/temperature tables, see section 27, page 55.
9
6
3
±
8
5
2
0
7
4
1
•
ACTIVATE
SET
TIMER
SET TEMP
OFFSET
SETUP
REL MV
BASE
PRINT
OPTIONS
MR
OPTIONS
ALARM
READY
SLOPE
RESLN
MODE HOLD
CAL EDIT
BEEP
YES
ON/OFF
SHIFT NO MI
OPTIONS
CAL
MEAS
AB
D
For manual temperature calibration:
A. press CAL/MEAS to enter measure-
ment mode (if necessary).
B. press SET TEMP to select temp mode.
C. press numeric keys to set desired
temperature value.
D. press YES to confirm; NO to reenter.
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20
READY MEAS
mV
°C
ATC
mV
CAL
mV
°C
Temp
ATC INPUT
Figure 12
Plug temperature probe into ATC jack at
back of unit. The ATC indicator will show
on LCD (above).
Figure 13