Oakton Ion 510 Series User manual

pH/mV/Ion/°C meter
ON/OFF
MEAS
MODE
HOLD
▲▼
ENTER
CAL
MR
MI
The
pH510andIon510Series
BenchtopMeters
WD-35619-00, -02, -03, -05, -07,
-08, -10, -12, -15, -17
WD-35619-20, -22, -23, -25, -27, -28
pH510—pH/mV/°Cmeter
Ion510—pH/Ion/mV/°Cmeter
2/00 ©2000 00702-93

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introduction
Tableofcontents
1. Introduction............................................................................................................................................................................4-7
• Keypad • Rear panels • Optional Electrode Holder
2. Starting up.................................................................................................................................................................................8
3. pH calibration and measurement...................................................................................................................................9-13
• Calibration • Measurement (with manual or automatic temperature compensation) • Hold function
4. mV calibration and measurement.................................................................................................................................14-15
• Calibration • Measurement • Hold function
5. Ion calibration and measurement (Ion 510 only)......................................................................................................16-18
• Calibration • Measurement • Hold function
6. Memory Function.....................................................................................................................................................................19
• Memory input • Memory recall
7. Temperature Calibration .......................................................................................................................................................20
8. Setup mode........................................................................................................................................................................21-23
• Clear memory • Electrode data • Buffer selection • Reset
9. Electrode care...................................................................................................................................................................24-25
• Electrode activation • Electrode maintenance • Storing pH/ORP electrode • Electrode cleaning
10. Troubleshooting................................................................................................................................................................26-27
11. Additional information.........................................................................................................................................................28
12. Specifications..........................................................................................................................................................................29
13. Accessories.............................................................................................................................................................................30
14. Warranty.....................................................................................................................................................................................31
15. Return of items........................................................................................................................................................................31
3
Quick tip
let the mini table of contents in the outer
margins of this manual guide you instantly
to the right section
memory
function
Ion calibration
and
measurement
setup
mode

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4
pH/mV/Ion°C meter
ON/OFF
MEAS
MODE
HOLD
▲▼
ENTER
CAL
MR
MI
1.Introduction
Thank you for purchasing the OAKTON®WD-35619-series
Benchtop meters. These meters are microprocessor
controlled, user-friendly and reliable. The large customized
LCD allows clear, easy operation. The display has mode
annunciators for pH, temperature, mV and ion readings.
Keypad
See Figure 1.
A large membrane keypad with touch feedback makes the
meter easy to use. Names and symbols describe the
function button controls.
Key Description
ON/OFF Powers the meter ON/OFF. When the meter is
switched on, it starts in the mode the meter
was last in when powered down.
CAL/MEAS Switches between the measurement and cali-
bration modes of the meter. In SETUP mode,
CAL/MEAS returns to the measurement mode.
MODE pH 510:
Measurement: MODE switches between pH
and mV.
Calibration: MODE switches from pH to temper-
ature in the pH calibration mode (if MODE is
pressed again, it will NOT switch back to pH).
Ion 510:
Measurement: MODE switches between pH,
mV and ion.
Calibration: MODE switches from pH to tem-
perature in the pH calibration mode (if MODE is
pressed again, it will NOT switch back to pH).
MI/▲▲Scrolls values in mV and temperature
calibration mode. Selects calibration points in
the ion calibration mode (Ion 510). Scrolls to the
next program in the SETUP mode.
MI inputs measurements into memory and
scrolls through memory values.
MR/▼▲Scrolls values in mV and temperature
calibration mode. Selects calibration points in
the ion calibration mode (Ion 510). Scrolls to the
previous program in the SETUP mode.
MR recalls measurements from memory and
scrolls through memory values.
HOLD Freezes a measurement on the display. Press
again to get current readings.
ENTER Confirms and enters the value selected for
calibration. Enter also functions in the memory
mode.
Figure 1
ON/OFF
MEAS
MODE
HOLD
▲▼
ENTER
CAL
MR
MI
memory
function
Ion calibration
and
measurement
setup
mode

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5
Figure 2
RearPanel
See Figure 2.
The OAKTON®WD-35619-series meters provide a
complete set of input connections for the various
accessories commonly used. Listed in the table below
are details of the connections that you can make.
Connection Function
ATC Phono jack connection from the tempera-
ture probe for Automatic Temperature
Compensation.
INPUT For connection to sensor electrodes with
BNC type connectors. The meter
accepts any pH, ORP or ISE with BNC
connector. Always make sure that the
connector is clean and dry.
REF For connection to pin type reference
electrode normally used with half cell
(mono) type pH electrodes or ISEs.
REC For connection to strip chart recorders.
Use subminiature plug with positive tip.
GND For connection to the earth ground jack
(standard tip connectors).
DC For connection of the AC adapter power
supply (included).
ATC INPUT REF REC GND DC
memory
function
Ion calibration
and
measurement
setup
mode

6
OptionalElectrodeHolder
If you have purchased a benchtop meter
with the optional electrode holder, the
electrode holder is included in the same
box as the meter.
Toattachtheelectrodeholdertothemeter:
1. The electrode holder base attached to
the bottom of the meter comes in the
shipping position.
— See Figure 3.
2. Use a Phillips screwdriver to remove the
screw holding the electrode holder in
shipping position.
— See Figure 3.
3. Slide the electrode base away from the
meter until the second screw slot lines
up with the original screw hole. Use the
screw removed earlier to secure
electrode holder base into position.
— See Figure 4.
4. The electrode holder arm is reversible. If
desired, remove screw holding electrode
holder base and slide base out of
brackets. Slide base into brackets on
opposite side and replace screw.
— See Figure 5.
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memory
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Ion calibration
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mode
Bottom of meter
Figure 3
Figure 4
Figure 5
Shipping position
Bottom of meter
Bottom of meter

7
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memory
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Ion calibration
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mode
Figure 6
Figure 7
5. To install the electrode arm, turn meter
back to the upright position.
— See Figure 6.
6. Line up the hole on the base of the
electrode holder arm with the peg on
the electrode holder base. Slide the hole
securely onto the electrode holder base.
— See Figure 7.
The electrode arm is now ready to swing
into desired position.— See Figure 8.
pH/mV/Ion/°C meter
ON/OFF
MEAS
MODE
HOLD
▲▼
ENTER
CAL
MR
MI
The electrode arm is now
ready to swing into
desired position.
Figure 8

8
2.StartingUp
Backpanelconnections
See Figure 9 .
1. Connect the AC adapter from an AC power source to
the power jack (DC). Slide in the adapter jack of the A/C
adapter into the meter until it is firmly seated. Voltage is
set at 9V and the current is at 500 mA, (center positive
connector).
2. Connect a sensor electrode to the BNC input
connector (INPUT). The meter can accept any pH, ORP,
or Ion Selective Electrode with a BNC connector. Make
sure the connector is clean and dry. Slide the electrode
connector of the electrode over the BNC connector
socket. Make sure the slots of the connector are in line
with the posts of the socket. Rotate and push the con-
nector clockwise until it locks. For separate reference
electrodes, push electrode pin into jack marked “REF”.
3. Connect a temperature probe to the input jack
marked ATC. Insert the probe into the jack marked
with ATC on the rear of the instrument panel.
4. Connect your chart recorder to the jack marked REC
You can connect chart recorders or other data collection
devices. Plug in the sub miniature (2.5 mm) connector
from the chart recorder into the jack marked with REC.
Output signal is a mV signal equal to the measured
electrode output. The tip of the connector is positive,
the sleeve is negative
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Attention!
Do not get water on the BNC connector
during operation. Avoid touching the
connector with soiled or wet hands.
Figure 9
ATC INPUT REF REC GND DC
for
temperature
probe
for sensor
electrode for separate reference
electrode
for chart
recorder for ground for AC adapter
memory
function
Ion calibration
and
measurement
setup
mode

9
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3. pHcalibrationandmeasurement
For best accuracy calibrate at least a two points using
fresh pH buffers. Select calibration buffers with calibra-
tion values closest to the measurement range you expect
to work in. A three point calibration (USA buffers: 4.01,
7.01, and 10.01 or NIST buffers: 4.01, 6.86 and 9.18)
ensures maximum accuracy throughout the measure-
ment range.
For quick checks with less accuracy, perform a one point
calibration. Select the buffer value closest to the
measurement range you will work in.
If you choose to calibrate to only 1 or 2 pH values, the
older calibration values you do not calibrate to will remain
stored. These old stored calibration values may cause
accuracy loss when your readings are close to the old
stored calibration values. To clear old calibration data,
reset the meter as shown in Section 8, Program 4.0 on
page 23.
For ATC measurements, attach the temperature probe
to the meter. The ATC mode annunciator shows on the
display. —See Figure 10. Insert the probe into the solution
to be measured so that the sample temperature can be
recorded and pH readings automatically temperature
compensate. If manual temperature compensation is
preferred, do not plug a temperature probe into the
meter.
DONOTREUSESOLUTIONSAFTERCALIBRATION.
Contaminants in the solution can affect the calibration,
and eventually the accuracy of the measurements.
All new pH calibrations will over-ride existing stored pH
calibration data at these calibration points. The meter
retains stored pH calibrations even when the meter is
turned OFF.
memory
function
Ion calibration
and
measurement
pH
ATC
MEAS
C
setup
mode
Figure 10

10
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Figure 11
Figure 13
memory
function
Ion calibration
and
measurement
pH
ATC
MEAS
C
pH
CAL
pH
pH
READY
CAL
pH
setup
mode
Figure 12
pHcalibration
NOTE: We recommend that you perform at least a
2-point calibration using buffers that bracket (one above
and one below) the expected sample range. You can
perform a 1-point calibration, but make sure that the
buffer value is close to the sample value you are measur-
ing. Select pH 4, 7, or 10 buffers in pouches or bottles
from the OAKTON standard buffer solutions.
1. Press the ON/OFF key. All the LCD segments display
for a few seconds. The LCD switches to the last mode
the meter was turned OFF in when powered down
from the key pad. —See Figure 11
The customized LCD display will indicate the following:
Display Remarks
MEAS Measurement mode is selected.
pH Unit of measurement
°C Unit of temperature measurement
ATC Automatic Temperature Compensation
(if temperature probe or ”All-in-One“ probe
is connected)
pHCalibration
1. Make sure the meter is ON and if necessary, press the
MODE key to select pH mode. The pH indicator
appears in the upper right hand corner of the display.
—See Figure 11.
2. Rinse the electrode in deionized water or rinse solution.
If using the ATC function with a separate temperature
probe, rinse the temperature probe as well. DO NOT
WIPE THE pH OR TEMPERATURE PROBES DRY!
Wiping the probes causes static, and will create calibra-
tion and measurement instability.
3. Select the pH buffer and pour some into a CLEAN
container.
4. Dip the probe into the calibration buffer. The end of the
probe must be completely immersed into the sample.
Stir the probe gently to create a homogeneous sample.
5. Press CAL/MEAS to enter the pH calibration mode.
The CAL indicator appears. The primary display will
show the measured reading while the smaller
secondary display will indicate the pH standard buffer
solution. —See Figure 12.
The meter automatically recognizes the buffers in the set
you have selected in the SETUP mode (see page 23 for
instructions on how to select buffer sets): USA (4.01,
7.00 or 10.01) or NIST (4.01, 6.86, or 9.18) buffers.
7. Wait for the measured pH value to stabilize (when the
READY indicator displays in the left hand corner)
—See Figure 13.

11
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8. Press the ENTER button. The primary display flashes
the calibration value. The calibration point is now
stored in the meter. —See Figure 14.
• If you are performing a one-point calibration, press
CAL/MEAS to return to the measurement mode
and start taking pH readings.
• If you are performing a multi-point calibration go to
step 9.
9. Rinse the probe with de-ionized water or a rinse
solution, and place it in the next pH buffer. The meter
automatically switches to the next buffer solution
selected in the secondary display.
10. Wait for the measured pH value to stabilize (when the
READY indicator displays in the left hand corner)
11. Press the ENTER button. The primary display flashes
the calibration value. The calibration point is now
stored in the meter.
• If you are performing a two-point calibration, press
CAL/MEAS to return to the measurement mode
and start taking pH readings.
• If you are performing a three-point calibration go
to step 12.
12. Rinse the probe with de-ionized water or a rinse
solution, and place it in the next pH buffer.
13. Wait for the measured pH value to stabilize (when the
READY indicator displays in the left hand corner).
14. Press the ENTER button. The primary display flashes
the calibration value. The calibration point is now
stored in the meter. The meter automatically returns
to the pH measurement mode after a three-point
calibration is performed.
NOTES:
To exit from pH calibration mode without confirming
calibration, DO NOT press ENTER in step 8. Press
CAL/MEAS instead.
If the selected buffer value is not within the accepted
window (see below) from the measured pH value: the
electrode and buffer icon blink and ERR annunciator
appears next to the secondary display. Press CAL/MEAS
to exit the ERR condition.
—See Figure 15.
WindowofAcceptedValues:
USA 4.01 ±1.00
7.00 ±1.50
10.01 ±1.00
NIST 4.01 ±1.00
6.86 ±1.25
9.18 ±1.00
memory
function
Ion calibration
and
measurement
pH
READY
CAL
pH
pH
CAL
pH
ERR
setup
mode
Figure 14
Figure 15

12
pHMeasurement
This meter is capable of taking measurements with
automatic or manual temperature compensation. Automatic
temperature compensation only occurs when a temperature
sensor is plugged into the meter. If there is no temperature
sensor plugged into the meter, the default setting is auto-
matically 25°C (if the meter has never been manually set for
temperature) or the last manually set value will display. You
can manually set the temperature to match your working
conditions using a separate thermometer.
AutomaticTemperatureCompensation
For automatic temperature compensation (ATC) simply
plug the temperature probe into the meter (see page 8 for
directions). The ATC indicator will light on the LCD.
—See Figure 16..
NOTE: If you are using a temperature probe, the probe
must be submersed in the liquid you are measuring.
ManualTemperatureCompensation
IMPORTANT: For manual compensation, you must
disconnect the temperature probe.
1. Switch the meter on. Press the MODE key to select pH
mode.
2. Press the CAL/MEAS key to enter pH calibration mode.
The CAL indicator will appear above the primary display.
3. While the pH calibration mode, press the MODE key to
enter temperature calibration mode. The primary display
shows the current temperature setting and the
secondary display shows the default value 25°C (if the
meter has never been manually set for temperature) or
the last manually set value if the meter has previously
set for manual temperature compensation. If you have
not set the current temperature setting the primary
display will also show the default value of 25°C.
—See Figure 17.
4. Check the temperature of your sample using an accu-
rate thermometer.
5. Press the ▼or ▲keys to offset the temperature to the
measured value from step 4. —See Figure 18.
6. Press ENTER to confirm the selected temperature and
to return to the pH measurement mode.
The meter will now compensate pH reading for the
manually set temperature. —See Figure 19.
NOTE: To exit this program without confirming the
manual temperature compensation value, DO NOT press
ENTER in step 6. Press CAL/MEAS instead.
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Figure 17
Figure 19
Ion calibration
and
measurement
memory
function
pH
ATC
MEAS
C
CAL
C
CAL
C
pH
MEAS
C
setup
mode
Figure 16
Figure 18

pH
ATC
HOLD
C
13
TakingpHMeasurements
Be sure to remove the electrode soaker bottle or protective
rubber cap on the electrode before measurement.
To take readings:
1. Rinse the probe with deionized or distilled water before
use to remove any impurities adhering to the probe
body. If the pH electrode had dehydrated, soak it for
30 minutes in OAKTON electrode storage solution or a
2M-4M KCl solution.
2. Press ON to switch on meter. The MEAS annunciator
appears on the top center of the LCD. The ATC indicator
appears in the lower right hand corner to indicate
Automatic Temperature Compensation if temperature
probe is plugged. (For Manual Temperature
Compensation see page 12)
—See Figure 20.
3. Dip the probe into the sample. When dipping the probe
into the sample, the sensor or the glass bulb of the
electrode must be completely immersed into the
sample. Stir the probe gently in the sample to create a
homogenous sample.
4. Allow time for the reading to stabilize. When the
readings stabilize, a READY indicator displays. The
READY mode shows the readings are stable within a
range of ±0.01 pH. When this occurs, READY appears
on the top left corner of your display.
—See Figure 21.
5. To toggle between pH and mV in the pH 510, or to
toggle between pH, mV and ion in the Ion 510, press
the MODE key.
HOLDFunction
This feature lets you freeze the value of pH and tempera-
ture, mV and temperature or Ion and mV (Ion 510 only).
HOLD can be used anytime when in MEAS mode.
1. To hold a measurement, Press the HOLD key while in
measurement mode. ”HOLD“ will appear on the
display. —See Figure 22.
2. To release the held value, press HOLD again. Continue
to take measurements.
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memory
function
Ion calibration
and
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pH
ATC
MEAS
C
pH
ATC
READY
MEAS
C
setup
mode
Figure 20
Figure 21
Figure 22

14
4.mVcalibrationandmeasurement
mVcalibration
The customized LCD display will indicate the following:
Display Remarks
MEAS Measurement mode is selected.
R.mV Unit of measurement
°C Unit of temperature measurement
ATC Automatic Temperature Compensation
(if temperature probe or ”All-in-One“ probe
is connected)
mVCalibration
1. Make sure the meter is ON and if necessary, press the
MODE key to select mV mode. The mV indicator
appears in the upper right hand corner of the display.
—See Figure 23.
2. Press the CAL/MEAS key The CAL indicator appears
above the primary display. The primary display shows
the relative mV reading and the secondary display
shows the absolute mV value. —See Figure 24.
NOTE: If you have never calibrated relative mV or if the
meter has been reset, the value shown in the primary
display is the same as the absolute mV value.
3. Press the ▲or ▼keys to enter the relative mV value
that matches your desired reading. —See Figure 25.
4. Press the ENTER key to confirm the reading and to
return to the measurement mode. The primary display
now shows the relative mV reading. The R.mV indicator
appears in the upper hand corner. The meter automati-
cally returns to the mV measurement mode the ENTER
key is pressed. —See Figure 26.
NOTE: New mV calibrations will over-ride existing the
stored mV calibration data. The meter retains stored mV
calibrations even when the meter is turned OFF.
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ATC
MEAS mV
C
CAL mV
CAL mV
ATC
MEAS R.mV
C
setup
mode
Figure 23
Figure 24
Figure 25
Figure 26

15
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mVMeasurement
1. Make sure you are in the mV measurement mode.
Press the MODE key to choose the mV 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.
4. Allow time for the reading to stabilize. The primary
display will show the mV reading, and the secondary
display will show the current temperature reading. When
the readings stabilize, a READY indicator displays. The
READY mode shows the readings are stable within
±0.1 mV. When this occurs, READY appears on the top
left corner of your display.
—See Figure 27.
5. To toggle between pH and mV in the pH 510, or to
toggle between pH, mV and ion in the Ion 510, press
the MODE key. —See Figure 28.
HOLDFunction
This feature lets you freeze the value of pH and tempera-
ture, mV and temperature or Ion and mV (Ion 510 only).
HOLD can be used anytime when in MEAS mode.
1. To hold a measurement, Press the HOLD key while in
measurement mode. ”HOLD“ will appear on the
display. —See Figures 29 and 30.
2. To release the held value, press HOLD again. Continue
to take measurements.
Ion calibration
and
measurement
memory
function
ATC
READY
MEAS R.mV
C
MEAS
ppm
ATC
HOLD
R.mV
C
HOLD ppm
setup
mode
Figure 27
Figure 28
Figure 29
Figure 30

16
5.Ioncalibrationandmeasurement(Ion510only)
Ioncalibration
This instrument is capable of up to three-point ion calibra-
tion with a minimum of two-point calibration. Calibration
values are 0.10, 1.0, 10.0 or 100.0. All calibration should
be one decade apart. For example you may perform three-
point calibration to 0.10, 1.0 and 10.0, or two-point calibra-
tion to 10.0 and 100.0. Do NOT perform two-point
calibration to 1.0 and 100.0 the meter will display ”Er4“.
For best accuracy calibrate your meter to points with
similar concentrations to the solutions you want to test.
IONCalibration
The customized LCD display will indicate the following:
Display Remarks
MEAS Measurement mode is selected.
ppm Unit of measurement
1. Connect an Ion Selective Electrode (ISE) to the BNC
input connector on the back of the meter (See page 8)
and turn the meter ON.
2. Press MODE to select ion measurement mode. If the
meter has not been previously calibrated in the Ion
mode, the display will read ”- - -“ in the primary display
—See Figure 31.
3. Dip the electrode into 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.
4. Press CAL to enter the ion calibration mode. The CAL
indicator appears above the primary display and primary
display reads ”0.10“ —See Figure 32.
5. The first calibration point of 0.10 ppm appears on the
display. If you do NOT wish to calibrate to this point,
press ▲(up arrow) to skip and continue to the next
calibration point of 1.0 ppm or 10.0 ppm.
6. If you DO wish to calibrate to 0.10 ppm, make sure the
electrode is in the 0.10 calibration standard. The meter
will display the mV output of your electrode in the stan-
dard solution in the lower display. Allow the mV reading
to stabilize. When the reading stabilizes the READY
indicator will appear on the display. —See Figure 33.
Stabilization may take a few minutes depending on
electrode and standard concentration. Electrode response
in low concentrations is much slower than response in
high concentrations.
7. Press ENTER to confirm your calibration. The primary
display will flash for a few seconds —See Figure 34. The
meter will move on to the next calibration standard of
1.0 ppm.
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CAL
ppm
READY
CAL
ppm
READY
CAL
ppm
setup
mode
Figure 31
Figure 32
Figure 33
Figure 34

17
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Ion calibration
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8. Rinse off the electrode with deionized water before
placing it in the next calibration standard.
9. Allow meter to stabilize in the next calibration standard.
Wait for the READY indicator to appear before you
press the ENTER key to confirm the second calibration
point. The primary display flashes for a few seconds
then moves to the next calibration point of 10.0 ppm.
If you are performing a 2-point ion calibration, press
CAL/MEAS. ”SLO“ appears in the primary display with the
mV indicator, the number in the secondary display is the
actual electrode slope in mV. —See Figure 35. After a few
seconds the meter reverts to the measurement mode. You
are now ready to take ion measurements. If the slope is
outside acceptable limits or if incorrect standards have been
used the primary display will show Er3. —See Figure 36.
If you are performing a 3-point ion calibration, rinse off the
electrode with deionized water and place it in the next
calibration standard.
10. Allow meter to stabilize in the next calibration standard.
Wait for the READY indicator to appear before you
press the ENTER key to confirm the third calibration
point. The primary display flashes for a few seconds
then ”SLO“ appears in the primary display with the mV
indicator, the number in the secondary display is the
average electrode slope in mV. —See Figure 35. After a
few seconds the meter reverts to the measurement
mode. You are now ready to take ion measurement.
NOTES: You may compare the average electrode slope
value with the expected slope value for your electrode
from your electrode manual to verify electrode operation.
If you want to leave the calibration mode prior to confirming
two calibration points, press the CAL/MEAS key to exit the
calibration mode. The meter will revert to back to the earlier
calibration curve. If you have calibrated to two points press-
ing CAL/MEAS will confirm the new calibration
You must calibrate to at least two points in order for
calibration to take effect. If you only confirm the one
calibration point, the meter will display ”Er2“ when you
exit the calibration mode, and the meter will revert back to
the earlier calibration curve.—See Figure 37.
New ion calibrations will over-ride existing the stored ion
calibration data. The meter retains stored ion calibrations
even when the meter is turned OFF.
Ion calibrations will be erased if the power cord is
unplugged or power is cut off to the AC adapter even if the
meter is turned off.
mV
READY
CAL
ERR
setup
mode
Figure 35
Figure 37
CAL
ERR
Figure 36

18
Ionmeasurement
1. Turn meter ON. Press MODE to select ion
measurement mode. —See Figure 38.
2. Prepare samples as necessary (i.e. add Ionic Strength
Adjuster). Sample preparation varies depending on ion
type—see your electrode manual for details on the
specific electrode that you are using.
3. Dip electrode into the sample. The sensor or glass bulb
of the electrode must be completely immersed into the
sample.
4. Allow time for the reading to stabilize. When the read-
ings stabilize, a READY indicator displays. The READY
indicator shows when the readings are stable. When
this occurs, READY appears on the top left corner of
your display. The reading holds until the measured value
fluctuation exceeds the set limits. —See Figure 39.
NOTE: The lower display in the ion measurement mode
shows mV that correlates to the electrode output. Change
in mV will typically be 59.7 mV for monovalent ions (1+or
1-charge) and 29.8 mV for divalent ions (2+or 2-charge).
HOLDFunction
This feature lets you freeze the value of pH and tempera-
ture, mV and temperature or Ion and mV (Ion 510 only).
HOLD can be used anytime when in MEAS mode.
1. To hold a measurement, Press the HOLD key while in
measurement mode. ”HOLD“ will appear on the
display—See Figure 40.
2. To release the held value, press HOLD again. Continue
to take measurements.
HOLD ppm
MEAS
ppm
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READY
MEAS
ppm
setup
mode
Figure 38
Figure 39
Figure 40

19
6.Memoryfunctions
MemoryInput
Your meter can store up to 50 sets of data in any
combination of values:
pH 510 meter:
• pH and temperature
• mV (or relative mV) and temperature.
Ion 510 meter:
• pH and temperature
• mV (or relative mV) and temperature.
• ion and mV
For example, you can store 32 pH and 18 mV values for the
pH 510 or 15 ion, 12 mV and 23 pH values for the Ion 510.
To store a readings:
1. During any measurement or HOLD function, press the
MI key to input any data into the memory
2. MEM, “StO” and memory number will flash. The
meter then returns to measurement mode.
—See Figure 41.
NOTE: If the memory is full, the first value stored will be
erased to create space for the new value.
MemoryRecall
This function recalls the previous readings stored in the
memory. You can only access MR from the measurement
mode. Memory recall is in “Last In First Out” order.
To recall readings:
1. Press the MR key once to retrieve the last reading
stored. The memory location screen—MEM, “LOC”
and the memory number—will flash on the display. —
—See Figure 42.
2. Press the ENTER key to recall the reading stored
under that memory number. —See Figure 43.
3. Press the ENTER key again to return to the memory
location screen. The display automatically moves to
the next memory location screen. —See Figure 44.
4. If necessary, press the ▲key to select the next
memory location screen; press the ▼key to select
the previous memory location screen.
5. Repeat steps 2-4 to review additional stored data sets.
6. To exit Memory Recall, press the MEAS key to return
to the measurement mode.
NOTES: Readings stored in memory are retained even if
the unit is turned off. To erase all readings stored in
memory, see program P1.0 on page 21.
MEM
MEM
MEM
pH
MEM
C
MEM
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Figure 41
Figure 42
Figure 43
Figure 44

20
7.Temperaturecalibration
TemperatureCalibration
In this calibration procedure, the ATC probe is attached
to the meter and the ATC annunciator displays on
the right hand side of the LCD.—See Figure 45.
1. Dip the temperature probe into a solution of known
temperature, such as a temperature bath for a few
minutes until the temperature probe stabilizes.
2. To perform temperature calibration, you must be in the
pH measurement mode.
3. Press MODE to switch to the pH measurement mode if
you are in the mV or ion measurement modes.
4. Press CAL/MEAS to enter pH calibration mode.
—See Figure 46.
5. Press MODE again to switch to temperature calibration
—See Figure 47.
6. Press ▲and ▼to scroll to the correct temperature
value corresponding to the known solution
temperature. The meter allows a limit of ±5°C
variation (with 0.1°C resolution) of the input reading,
and of the original displayed reading.
7. Once you select the correct temperature, press ENTER
to confirm. The meter automatically returns to the pH
measurement mode.
NOTE: The meter will not allow input values that exceed
the allowable limit of ±5°C of the original displayed
reading.
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pH
ATC
MEAS
C
pH
CAL
pH
ATC
CAL
C
Figure 45
Figure 46
Figure 47

21
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8.SetupMode
The advanced SETUP mode lets you customize your
meter’s preferences and defaults:
P1.0: Memory clear (CLr)
P2.0: Viewing electrode data (ELE)
P3.0: Selecting buffer sets (bUF)
P4.0: Reset to factory default settings (rSt)
To enter the SETUP mode:
1. Turn meter OFF.
2. With meter off, press and hold the MODE key.
Continue to hold down the MODE key while pressing
and releasing the ON key. The will show the SETUP
indicator. —See Figure 48. Release the MODE key if the
SETUP indicator is present. If the display indicates you
are in the measurement mode (MEAS indicator) turn
the meter off and try step 2 again until SETUP
appears.
NOTE: To exit the SETUP mode at anytime without
confirming changes press CAL/MEAS until the
measurement mode reappears. If the meter is inside a
program, press CAL/MEAS two times to revert the
meter to the measurement mode.
P1.0:MemoryClear
Use this program to clear all memory values when you
need to store a new series of values. This lets you avoid
confusing the old values with the new ones. NO is the
default setting.
1. Enter the SETUP mode as described above. The meter
automatically goes to program P1.0. CLr appears in the
primary display and P1.0 in the secondary display.
—See Figure 48.
2. Press the ENTER key to enter program P1.0.
3. Press ▲and ▼keys to toggle between NO and YES.
—See Figures 49 and 50.
• NO retains current memory values.
• YES clears all memory
4. Press ENTER to confirm selection and return to the
SETUP mode. Press CAL/MEAS to return to the
measurement mode.
To continue to the next SETUP program, press the ▲or
▼keys to select a new program.
SETUP MEM
SETUP MEM
SETUP MEM
Figure 48
Figure 49
Figure 50