Accumet AP85 User manual

OPERATING INSTRUCTIONS accumet®13636AP85
AP85 Portable
Waterproof
pH/Conductivity Meter
1/02
IP
67
ISO 9001
v e n d o r
CERTIFIED

32
Table of Contents
1. Introduction..............................................................................................4
2. Display and keypad functions...............................................................5-6
2.1 Display......................................................................................................................................5
2.2 Keypad .....................................................................................................................................6
3. Preparation............................................................................................7-9
3.1 Inserting the batteries.............................................................................................................7
3.2 Probe information................................................................................................................8-9
4. Calibration.........................................................................................10-16
4.1 Important information on meter calibration....................................................................10
4.2 Preparing the meter for calibration ...................................................................................10
4.3 pH calibration ..................................................................................................................11-12
4.4 Conductivity and TDS calibration................................................................................13-15
4.5 Temperature calibration ......................................................................................................16
5. Measurement.....................................................................................17-22
5.1 Taking pH measurements ...................................................................................................17
5.2 Taking conductivity or TDS measurements.....................................................................18
5.3 HOLD function / Ready indicator / Auto endpoint .....................................................19
5.4 Using manual ranging function: conductivity/TDS.......................................................20
5.5 Selecting manual temperature compensation: conductivity/TDS ...............................21
5.6 Selecting the manual temperature compensation value ................................................22
6. Advanced setup functions.................................................................23-41
6.1 Advanced setup mode overview..................................................................................24-25
pH .........................................................................................................................................24
Conductivity/TDS...............................................................................................................25
6.2 Program 1.0: Viewing previous pH calibration data.......................................................26
6.3 Program 2.0: Viewing pH electrode data (slope and offset)..........................................27
6.4 Program 3.0: pH measurement configuration ............................................................28-30
P3.1 Selecting Ready indicator/auto endpoint function...............................................28
P3.2 Selecting number of pH calibration points .............................................................29
P3.3 Selecting USA or NIST buffer sets............................................................................30
P3.4 Selecting °C or °F.........................................................................................................31
6.5 Program 4.0: Resetting to factory default settings (pH).................................................32
6.6 Program 5.0: Viewing previous conductivity/TDS calibration data............................33
6.7 Program 6.0: Viewing conductivity/TDS probe data (effective cell constant) ...........34
6.8 Program 7.0: Conductivity/TDS measurement configuration.................................35-38
P7.1 Selecting Ready indicator/auto endpoint function...............................................35
P7.2 Selecting °C or °F.........................................................................................................36
P7.3 Selecting automatic or manual temperature compensation.................................37
P7.4 Setting the TDS factor.................................................................................................38
6.9 Program 8.0: Temperature settings...............................................................................39-40
P8.1 Setting the temperature coefficient...........................................................................39
P8.2 Selecting the normalization temperature ................................................................40
6.10 Program 9.0: Resetting to factory default settings (conductivity/TDS) ....................41
7. Probe care and maintenance ............................................................42-43
7.1 pH electrode care.............................................................................................................42-43
7.2 Conductivity probe care......................................................................................................43
8. Troubleshooting .....................................................................................44
9. Error Messages........................................................................................45
10. Specifications........................................................................................46
11. Appendix 1: conductivity to TDS conversion factors ..........................47
12. Appendix 2: calculating TDS conversion factors .................................48
13. Appendix 3: calculating temperature coefficients ..............................49
14. Appendix 4: meter factory default settings ........................................50

54
1. Introduction
Thank you for selecting an accumet®AP85 meter. This portable meter is a
microprocessor-based instrument that measures pH, conductivity, Total Dissolved
Solids (TDS) and temperature. Your meter has many user-friendly features, all of
which are accessible through the membrane keypad.
Your meter includes a single-junction pH electrode, a combination conductivity/
temperature probe, and batteries. Please read this manual thoroughly before
operating your meter.
2. Display and Keypad Functions
Display
The LCD has a primary and secondary display.
• The primary display shows the measured pH or conductivity reading.
• The secondary display shows the temperature of the reading.
The display also shows error messages, keypad functions and program functions.
2.1
Primary display
Secondary display
3.
2.
19
18.
12.
15.
14. 13.
11.
1.
17.
16.
4.
9.
10.
5.
6.
1. SETUP mode indicator
2. MEASurement mode
indicator
3. CALibration indicator
4. pH measurement
indicator
5. Millisiemens indicator
(conductivity)
6. Microsiemens indicator
(conductivity)
7. Parts per thousand
indicator (TDS)
8. Parts per million
indicator (TDS)
9. Temperature
indicators
10. pH setup indicator
11. Automatic
Temperature
Compensation
indicator
12. ERRor indicator
13. Low battery indicator
14. Probe indicator
15. Calibration indicator
16. Cell constant indicator
17. ON/OFF indicator
18. HOLD indicator
19. READY indicator
7.
8.

76
Keypad
The large membrane keypad makes the instrument easy to use. Each button,
when pressed, has a corresponding graphic indicator on the LCD.
ON/OFF............Powers and shuts off the meter.
HOLD ..............Freezes the measured reading. To activate, press HOLD while in
measurement mode. To release, press HOLD again.
NOTE: When auto endpoint feature is switched on, meter automati-
cally holds reading after 5 seconds of stability. The HOLD indicator
appears on the display. Press HOLD to release auto endpoint feature.
MODE ..............Selects the measurement parameter. Press MODE to toggle between
pH, conductivity and TDS readings. In calibration mode, press
MODE to access temperature calibration.
CAL/MEAS......Toggles user between Calibration and Measurement mode. For exam-
ple, if you are in pH measurement mode, press CAL/MEAS to enter
pH calibration mode.
NOTE: Temperature calibration is available from calibration mode;
see page 16 for directions.
In advanced set-up mode: Press CAL/MEAS to return to main menu
from sub menus. Press CAL/MEAS again to return to measurement
mode from main menu.
ENTER ............Press to confirm values in Calibration mode and to confirm
selections in Setup mode.
RANGE ............Press to switch to manual ranging in Conductivity (or TDS) mode.
▲▼..........Press in Setup mode to scroll through subgroups. Also lets
you increment/decrement the values in the conductivity and
temperature calibration modes.
SETUP ..............Press to enter SETUP mode.
SETUP mode lets you
customize meter preferences
and defaults, and view
calibration and probe data.
2.2
Battery
compartment
Remove these
two screws to
access battery
compartment
3. Preparation
Inserting the Batteries
Four AAA batteries are included with your meter.
1. Use a Phillips screwdriver to remove the two screws holding the battery cover.
See figure below.
2. Lift off battery cover to expose batteries.
3. Insert batteries. Follow the diagram inside the cover for correct polarity.
4. Replace the battery cover into its original position. Screw cover back into place.
3.1

98
Probe information
Your AP85 meter includes two probes:
• single junction, epoxy body combination pH electrode with BNC connector
• conductivity/TDS/temperature probe with a notched 6-pin connector
The temperature sensing element built into the conductivity probe will also
compensate for pH readings as long as both probes are in your solution at the
same time.
If you want to use an “All in One” pH probe with a built-in temperature element, or
if you want to use a separate temperature probe, you will need to disconnect the
conductivity/TDS probe to allow for connection of the separate temperature sensor.
You can use any standard pH electrode with a BNC connector with this meter.
Conductivity/TDS probes, “All in One” pH electrodes with a built-in temperature
element, and temperature probes require a notched 6-pin connector.
NOTE: Keep connector dry and clean. Do not touch connector with soiled hands.
3.2
To connect the pH electrode:
1. Slide the BNC connector of the probe over the BNC connector socket on the
meter. Make sure the slots of the connector are in line with the posts of the
socket. Rotate and push the connector clockwise until it locks.
See figure below.
2. To remove probe, push and rotate the connector counterclockwise. While
holding onto the metal part of the connector, pull probe away from the meter.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
To connect the conductivity/TDS/temperature probe:
1. Line up the notch and 6 pins on the meter with the holes in the 6-pin connector.
Push down and turn the locking ring clockwise to lock into place.
See figure below.
2. To remove probe, turn the locking ring counterclockwise on the probe connector.
Pull probe away from the meter.
NOTE: follow the same directions to connect an optional separate temperature
element.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
conductivity/TDS temperature probe
(with 6-pin connector)
locking ring
pH electrode
(with BNC connector)
top view of 6-pin
connector—
conductivity/TDS
temperature probe

1110
pH calibration
We recommend that you calibrate at least two buffers that bracket (one above and one
below) your expected sample range.
Preparing for pH calibration
This meter can calibrate up to 5 pH buffer values to ensure accuracy across the entire
pH range. Select from the following buffer options:
USA: pH 1.68, 4.01, 7.00, 10.00, 12.45
NIST: pH 1.68, 4.01, 6.86, 9.18, 12.45
The meter automatically recognizes these standard buffer values, which makes pH
calibration faster and easier. See Set-up program P3.3 on page 30 for directions on how
to select USA or NIST buffer sets.
Be sure to remove the protective electrode storage bottle or rubber cap of the
probe before calibration or measurement. If the electrode has been stored dry,
rehydrate the probe in tap water for 10 minutes before use to saturate the pH
electrode surface and minimize drift.
Rinse your probe in deionized water after use, and store in electrode storage
solution. DO NOT store in deionized water. If storage solution is not available, use
pH 4.0 or 7.0 buffer.
For directions on how to calibrate your meter:
• See section 4.3 on pages 11-12 for pH calibration
• See section 4.4 on page 13-15 for conductivity and TDS calibration
• See section 4.5 on page 16 for Temperature Calibration
Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement mode.
When you switch on the meter, the meter starts up in the units last used. For
example, if you shut the meter off in "pH" units, the meter will read "pH" units
when you switch the meter on.
Do not reuse calibration solutions after calibration. Contaminants in the solution can
affect the calibration, and eventually the accuracy of the measurements.
4. Calibration
Important Information on Meter Calibration
When you recalibrate your meter, old calibration points are replaced on a “point
by point” basis in pH, and on a “range by range” basis in conductivity or TDS.
For example:
•pH: if you previously calibrated your meter at pH 4.01, 7.00, and 10.00, and you
recalibrate at pH 7.00, the meter retains the old calibration data at pH 4.01 and
pH 10.00.
•Conductivity/TDS: if you previously calibrated your conductivity meter at 1413 µS
in the 0 to 1999 µS range and you recalibrate at 1500 µS (also in the 0 to 1999 µS
range), the meter will replace the old calibration data (1413 µS) in that range.
The meter will retain all calibration data in other ranges.
TDS values are proportional to conductivity values. If you calibrate a TDS value
in an equivalent conductivity range, the TDS value will replace the previous
conductivity value, and vice versa.
To view current calibration points:
• pH: Program P1.0 in the SETUP section, page 26.
• Conductivity/TDS: Program P5.0 in the SETUP section, page 33.
To completely recalibrate your meter, or when you use a replacement probe,
it is best to clear old calibration data by resetting the meter.
To reset the meter to its factory defaults:
• pH: Program P4.0 in the SETUP section, page 32.
• Conductivity/TDS: Program P9.0 in the SETUP section, page 41.
NOTE: Resetting the meter will set meter to factory defaults.
pH and Conductivity/TDS must be reset separately.
4.2
4.1
To calibrate pH:
1. If necessary, press the MODE key to
select pH measurement mode. The pH
indicator appears in the upper right hand
corner of the display.
See figure
2. Rinse the pH electrode thoroughly with
deionized water or a rinse solution. Do
not wipe the probe; this causes a build-up
of electrostatic charge on the glass surface.
3. Dip the pH electrode into the calibration
buffer. The end of the probe must be com-
pletely immersed into the sample. Stir the
probe gently to create a homogeneous
sample.
NOTE: The temperature element is in
the conductivity cell. For temperature
compensated readings, dip the conductivity
cell into the calibration buffer as well.
4.3
A
CONTINUED ON NEXT PAGE
A

1312
4. Press CAL/MEAS to enter pH calibra-
tion mode. The CAL indicator lights.
The primary display will show the
measured reading while the smaller
secondary display will indicate the
pH standard buffer solution.
See figure
5. Wait for the measured pH value to
stabilize. If the READY indicator has
been activated (set up program
P3.1—see page 28), the READY
annunciator lights when the reading
is stable.
6. Press ENTER to confirm
calibration. The meter is now
calibrated to the current buffer.
The lower display scrolls through
the remaining buffer options.
• If you are performing a multipoint
calibration, go to step 7.
• If you are performing a one-point
calibration, go to step 9.
7. Rinse the electrode with deionized
water or a rinse solution, and dip in
the next pH buffer.
8. Follow steps 5 to 8 for additional
calibration points.
9. When calibration is complete,
press CAL/MEAS to return to pH
measurement mode.
See figure
Notes
To exit from pH Calibration mode without confirming calibration, DO NOT press
ENTER in step 6. Press CAL/MEAS instead.
If the selected buffer value is not within ±1.0 pH from the measured pH value: the
electrode and buffer icon blink and the ERR annunciator appears in the lower left
corner of the display.
To limit the number of pH buffer values available during calibration, see Set-up
program P3.2 on page 29.
To select USA or NIST buffer sets, see Set-up program P3.3 on page 30.
C
C
B
B
Conductivity and TDS calibration
You can calibrate up to 5 conductivity or TDS points, using a maximum of one point
per range (listed below):
Range Conductivity: TDS:
R1 0.00-19.99 µS 0.00-9.99 ppm
R2 0.0-199.9 µS 10.0-99.9 ppm
R3 0-1999 µS 100-999 ppm
R4 0.00-19.99 mS 1.00-9.99 ppt
R5 0.0-199.9 mS 10.0-199.9 ppt
If you are measuring values in more than one range, make sure to calibrate each of
the ranges you are measuring. All new calibration data will over-ride existing stored
calibration data for each measuring range you calibrate.
• If you are measuring in ranges near to or greater than 20 mS (10 ppt), or near to
or lower than 100 µS (50 ppm), calibrate the meter at least once a week to get
specified ±1% full scale accuracy.
• If you are measuring in the mid ranges and you rinsed the probe in deionized
water and stored it dry, calibrate the meter at least once a month.
• If you take measurements at extreme temperatures, calibrate the meter at least
once a week.
Preparing for conductivity/TDS calibration
For best results, select a calibration standard value close to the sample value you
are measuring. Alternatively, use a calibration solution value that is approximately
2⁄3the full scale value of the measurement range you plan to use. For example,
in the 0 to 1999 µS conductivity range, use a 1413 µS solution for calibration.
See the table below for recommended calibration solution ranges:
4.3
Temperature coefficient: This meter is factory set to a temperature coefficient
of 2.1% per °C. For most applications this will provide good results. See
Program P8.1 on page 39 to set the temperature coefficient to a different value.
See Appendix 3, “Calculating Temperature Coefficients” on page 49 to determine
the appropriate temperature coefficient for your solution.
Normalization temperature: The factory default value for normalization temperature
is 25°C. If you need to normalize to a value other than 25°C, see Program P8.2 on
page 40.
CONTINUED ON NEXT PAGE
Conductivity Recommended TDS Recommended
Range Cal. Solution Range Range Cal. Solution Range
0.00-19.99 µS 6.00 to 17.00 µS 0.00-9.99 ppm 3.00 to 8.50 ppm
0.0-199.9 µS 60.0 to 170.0 µS 10.0-99.9 ppm 30.0 to 85.0 ppm
0-1999 µS 600 to 1700 µS 100-999 ppm 300 to 850 ppm
0.00-19.99 mS 6.00 to 17.00 mS 1.00-9.99 ppt 3.00 to 8.50 ppt
0.0-199.9 mS 60.0 to 170.0 mS 10.0-199.9 ppt 30.0 to 170 ppt
NOTE:
1000 µS = 1 mS
1000 ppm = 1 ppt

1514
Notes
When entering calibration mode, the meter will display the factory default value. If
the meter was previously calibrated, the display may “jump” to the factory default
value when switching from measurement to calibration mode.
To exit from Conductivity Calibration mode without confirming calibration, DO NOT
press ENTER in step 7. Press CAL/MEAS instead. This will retain the old calibration data
in the measuring range of the calibration. You can offset the conductivity reading up to
±40% from the default setting. If your measured value differs by more than ±40%,
clean or replace probe as needed.
To calibrate conductivity:
1. If necessary, press the MODE key to
select conductivity mode.
See figure
2. Rinse the probe thoroughly with
deionized water or a rinse solution,
then rinse with a small amount of
calibration standard.
3. Dip the probe into the calibration
standard. Immerse the probe tip beyond
the upper steel band. Stir the probe
gently to create a homogeneous sample.
See figure
4. Wait for the measured conductivity
value to stabilize. If the READY
indicator has been activated (set up
program P7.1—see page 34), the
READY annunciator lights when the
reading is stable.
5. Press CAL/MEAS to enter conductivity
calibration mode. The CAL indicator
will appear above the display.
See figure
6. Press the ▲or ▼to change the value
on the primary display to match the
value of the calibration standard. The
secondary display shows the factory
calibrated value.
See figure
7. Press ENTER to confirm the calibra-
tion value. The meter returns to the
MEAS (measurement) mode.
8. Repeat steps 1-7 for other ranges.
C
D
D
A
A
B
B
C
Immerse
probe beyond
upper steel
band
Leave probe
guard on
during
measurement
Leave probe
guard on
during
measurement
1. If necessary, press the MODE key to
select TDS mode.
See figure
2. Rinse the probe with de-ionized water
or a rinse solution, then rinse with a small
amount of calibration standard.
3. Dip the probe into the calibration
standard. Immerse the probe tip beyond
the upper steel band. Stir the probe gently
to create a homogeneous sample.
See figure
4. Wait for the measured TDS value to
stabilize. If the READY indicator has
been activated (set up program P7.1—
see page 34), the READY annunciator
lights when the reading is stable.
5. Press CAL/MEAS to enter TDS calibration
mode. The CAL indicator will appear
above the display.
See figure
6. Press the ▲or ▼keys to change the value
on the primary display to match the value
of the calibration standard. The secondary
display shows the factory calibrated value.
See figure
7. Press ENTER to confirm the calibration
value. The meter returns to the MEAS
(measurement) mode.
8. Repeat steps 1-7 for other ranges.
C
D
D
A
A
B
B
C
Immerse
probe beyond
upper steel
band
Calibrating for TDS directly
The factory default setting for TDS conversion factor is 0.5. If your solution has a
different TDS factor, you can improve calibration accuracy by setting the TDS factor
prior to calibration. See SetUp Program P7.4 on page 38 for directions. See
Appendixes 1 and 2 on pages 47-48 to determine your exact TDS factor.
Notes
• When entering calibration mode, the meter will display the factory default value.
If the meter was previously calibrated, the display may “jump” to the factory default
value when switching from measurement to calibration mode.
• To exit from TDS Calibration mode without confirming calibration, DO NOT press
ENTER in step 7. Press CAL/MEAS instead. This will retain the old calibration data in
the measuring range of the calibration.
• You can offset the TDS reading up to ±40% from the default setting. If your meas-
ured value differs by more than ±40%, clean or replace probe as needed.

1716
5. Dip the ATC element into a
solution of known temperature
(i.e. a temperature bath). Allow
time for the temperature element
to stabilize.
6. Scroll with the ▼and ▲keys to set
the correct temperature value (i.e. the
temperature of the temperature bath).
You can adjust the reading in incre-
ments of 0.1°C.
See figure
7. Once you have selected the correct
temperature, press the ENTER key.
The meter automatically returns to
measurement mode.
Notes
• You can offset the temperature reading
up to ±5°C from the original reading.
• To exit this program without confirming
the temperature calibration value, DO
NOT press ENTER in step 7. Press
CAL/MEAS instead.
Temperature calibration
The temperature sensor (located in the conductivity cell) is factory calibrated.
Calibrate your sensor only if you suspect sensor drift that may have occurred
over a long period of time or if you have a replacement probe.
Temperature calibration
1. Make sure the conductivity cell (or alternative temperature element) is attached
to the 6-pin connector.
2. Switch the meter on. The ATC annunciator will appear at the right-hand side of
the LCD.
3. Press the CAL/MEAS key to enter calibration mode (either pH or conductivity).
The CAL indicator will appear above the primary display.
4. While in calibration mode, press the MODE key to enter temperature calibration
mode. The primary display shows the last set temperature value and the
secondary display shows the temperature reading with zero offset.
See figure
4.5
B
B
A
A
5. Measurement
NOTE: For pH manual temperature
compensation, you must disconnect
the conductivity cell from the 6-pin
connector. The ATC indicator will
disappear from the display. You also
need to set a manual temperature
compensation value—see page 22
for directions.
Taking pH Measurements
To take readings:
1. Rinse the pH electrode with deionized or distilled water before use to remove any
impurities adhering to the probe body. If the pH electrode has dehydrated, soak it
for 30 minutes in electrode storage solution, pH buffer, or a 2M–4M KCl solution.
2. Press ON to switch on meter.
3. Press the MODE key to select pH measurement mode. 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.
See figure
5.1
A
A
4. Dip the pH electrode into the sample. Since the conductivity cell contains the
temperature sensor, make sure it is also immersed in your solution.
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.
5. Allow time for the reading to stabilize. Note the reading on the display. If the
Ready indicator is selected on, it will appear when the reading is stable. See page
20 for more information.
6. Press the MODE key to toggle between pH and conductivity readings.

1918
NOTE: For conductivity manual
temperature compensation, you must
deactivate the temperature sensor built
into the conductivity probe and set a
manual temperature compensation
value. See pages 21-22 for directions.
The ATC indicator will disappear from
the display.
4. Dip the probe into the sample.
When dipping the probe into the
sample, the tip of the probe must be
immersed above the second steel band.
Stir the probe gently in the sample to
create a homogenous sample.
See figure
5. Allow time for the reading to
stabilize. Note the reading on the
display. If the Ready indicator is
selected on, it will appear when
the reading is stable. See page 20
for more information.
Taking Conductivity or TDS Measurements
To take readings:
1. Rinse the probe with deionized or distilled water before use to remove any
impurities adhering to the probe body. Shake or air dry. To avoid contamination or
dilution of your sample, rinse probe with a small volume of your sample liquid.
2. Press ON to switch on meter.
3. Press the MODE key to select conductivity (or TDS) measurement mode. 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.
See figure
A
A
5.2
B
B
6. Press the MODE key to toggle between conductivity and pH readings.
Notes
You can use the conductivity/TDS manual ranging function to select a specific range
in which your readings will appear. See page 20 for directions.
HOLD function
This feature lets you freeze your reading for a delayed observation. HOLD can be
used any time 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
2. To release the held value, press
HOLD again. Continue to take
measurements.
NOTE: This meter shuts off
automatically after 20 minutes of
nonuse. If the meter is shut off either
automatically or manually, the HOLD
value will be lost.
Taking measurements with READY indicator selected on
If the READY indicator has been activated, the READY annunciator lights when
the reading is stable. Switch the READY indicator on or off in Set up program
P7.1—see page 35 for directions.
Taking measurements with the auto endpoint feature selected on
When a reading is stable for more than 5 seconds, the auto endpoint feature will
automatically “hold” the reading. The “hold” indicator appears on the left side of the
display. Press the HOLD key to release the reading. Switch the Auto endpoint feature
on or off in Set up program P7.1—see page 35 for directions.
C
C
5.3
Leave probe
guard on
during
measurement
Immerse
probe beyond
upper steel
band

2120
From measurement mode:
1. To select the desired measuring range, press the RANGE key while in
Conductivity measurement mode. The first range will appear on the display.
The “MEAS” indicator blinks, and the “Range” number flashes briefly in the
lower display.
Range Conductivity: TDS:
R1 0.00-19.99 µS 0.00-9.99 ppm
R2 0.0-199.9 µS 10.0-99.9 ppm
R3 0-1999 µS 100-999 ppm
R4 0.00-19.99 mS 1.00-9.99 ppt
R5 0.0-199.9 mS 10.0-199.9 ppt
See figure
2. Press the RANGE key again (if needed)
until desired range is selected.
3. To reselect the Auto-ranging function, repeatedly press the RANGE key until the
“MEAS” indicator appears without blinking.
Notes
This meter will not let you manually select a range in which the reading will be
overrange.
The meter resets to the Auto-ranging function once it is turned off. You will
have reset the manual ranging function each time you turn the meter off.
Using manual ranging function: conductivity/TDS
When shipped from the factory, your meter automatically selects the range in which
your readings appear. The manual ranging function lets you select the specific range
in which you want to work.
A
A
5.4
From measurement mode
1. Press the Mode key to select
conductivity measurement mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P7.0.
See figure
4. Press the ENTER key three times
to select parameter 7.3. The upper
display shows “ATC” and the lower
display shows “P7.3”.
See figure
5. Press the ENTER key again.
The upper display shows “ATC”
and the lower display shows “YES”
or “NO”.
6. Press the ▲and ▼keys to select
the Automatic Temperature
Compensation off.
• YES = ATC on
• NO = ATC off
(manual compensation)
See figure
7. Press the ENTER key to confirm
selection and to return to the sub-
group menu. Press the CAL/MEAS
key to return to measurement mode.
Note that the ATC indicator no longer
appears on the display.
Go to page 22 to select a manual
temperature compensation value.
Selecting manual temperature compensation:
conductivity or TDS
For manual temperature compensation in conductivity or TDS mode, you must:
1. Deactivate the temperature element built into the conductivity/TDS probe.
2. Select a manual temperature compensation value (see page 22).
You can deactivate the temperature element (select manual temperature compensa-
tion) in Set Up Program P7.3.
A
B
C
A
B
C
5.5

2322
1. Press the MODE key to select the meas-
urement mode in which you need to use
manual temperature compensation.
2. If necessary, select ATC off.
pH: see NOTE on page 17
Conductivity/TDS: see page 21
When ATC is off, the ATC indicator
disappears from the lower right corner
of the display.
3. Press the CAL/MEAS key to enter
calibration mode. The CAL indicator
will appear above the primary display.
See figure
4. While in 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
last set temperature value.
See figure
5. Check the temperature of your sample
using an accurate thermometer.
6. Press the ▲or ▼keys to offset the
temperature to the measured value
from step 5.
See figure
7. Press ENTER to confirm the selected
temperature and to return to measure-
ment mode.
Selecting the manual temperature compensation value
To use manual temperature compensation, you need to enter the temperature
value of your process into the meter. This is the value at which readings will
manually temperature compensate. You can select any temperature between
0 and 100°C (32 and 212°F). Default value is 25°C (77°F).
To select a manual temperature compensation value:
D
D
E
E
F
F
The meter will now compensate readings for the manually set temperature.
Notes
To exit this program without confirming the manual temperature compensation value,
DO NOT press ENTER in step 7. Press CAL/MEAS instead.
Setting the manual temperature compensation value for conductivity or TDS will change
the manual temperature compensation value for pH to the same value, and vice versa.
5.6 6. Advanced set up functions
The advanced set up mode lets you customize your
meter’s preferences and defaults. Your waterproof
meter features different sub groups that organize all
set-up parameters.
This meter blanks out sub groups that do not apply
to the measurement mode [conductivity/TDS or pH]
you are in when you enter Setup mode.
The full selection of available sub groups are:
pH sub groups
1. P1.0: Viewing pH calibration data
2. P2.0: Viewing pH probe data
3. P3.0: pH configuration
4. P4.0: Resetting meter to factory default
( pH settings)
Conductivity/TDS sub groups
5. P5.0: Viewing conductivity (TDS) calibration data
6. P6.0: Viewing conductivity (TDS) probe data
7. P7.0: Conductivity (TDS) configuration
8. P8.0: Conductivity (TDS) temperature parameters
9. P9.0: Resetting meter to factory default
(conductivity/TDS settings)
See pages 24-25 for a more detailed overview
on the different parameters available in the
sub group modes.

2524
Advanced set-up mode detailed overview
P1.0: Viewing pH calibration data
P1.1 View previous pH calibration data (pH 1.68)
P1.2 View previous pH calibration data (pH 4.01)
P1.3 View previous pH calibration data (pH 7.00/6.86)
P1.4 View previous pH calibration data (pH 10.01/9.18)
P1.5 View previous pH calibration data (pH 12.45)
P2.0: Viewing pH electrode data
P2.1 View electrode offset
P2.2 View electrode slope
6.1
P3.0: pH configuration
P3.1 Ready indicator on or off /
auto endpoint on or off
P3.2 Select number of pH calibration points
P3.3 Select USA or NIST buffer sets
P3.4 Select °F or °C
P4.0: Reset to factory default (pH)
Reset pH data to factory default settings
Instructions on page 26
Press the SETUP key to enter Set up mode.
Press the ▲and ▼keys to scroll through sub groups.
P9.0: Reset to factory default (Con./TDS)
Reset conductivity data to factory default settings
Sub groups available from pH measurement mode
P5.0: Viewing Con./TDS calibration data
P5.1 View conductivity/TDS calibration data R1
R1 = 0.00-19.99 µS / 0.00-9.99 ppm
P5.2 View conductivity/TDS calibration data R2
R2 = 0.0-199.9 µS / 10.0-99.9 ppm
P5.3 View conductivity/TDS calibration data R3
R3 = 0-1999 µS / 100-999 ppm
P5.4 View conductivity/TDS calibration data R4
R4 = 0.00-19.99 mS / 1.00-9.99 ppt
P5.5 View conductivity/TDS calibration data R5
R5 = 0.0-199.9 mS / 10.0-199.9 ppt
P6.0: Viewing Con./TDS probe data
P6.1 View effective cell constant R1
R1 = 0.00-19.99 µS / 0.00-9.99 ppm
P6.2 View effective cell constant R2
R2 = 0.0-199.9 µS / 10.0-99.9 ppm
P6.3 View effective cell constant R3
R3 = 0-1999 µS / 100-999 ppm
P6.4 View effective cell constant R4
R4 = 0.00-19.99 mS / 1.00-9.99 ppt
P6.5 View effective cell constant R5
R5 = 0.0-199.9 mS / 10.0-199.9 ppt
P7.0: Con./TDS configuration
P7.1 Ready indicator on or off /
auto endpoint on or off
P7.2 Select °F or °C
P7.3 Select ATC/Manual Temperature Compensation
P7.4 Set TDS factor
P8.0: Temperature parameters
P8.1 Set temperature coefficient
P8.2 Set normalization temperature
Instructions on page 33
Sub groups available from conductivity/TDS measurement mode
Instructions on page 27
Instructions on page 34
Instructions on pages 35-38
Instructions on pages 39-40
Instructions on pages 28-31
Instructions on page 32
Instructions on page 41

2726
From measurement mode
1. Press the Mode key to select pH
measurement mode.
2. Press the Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P2.0.
See figure
4. Press the ENTER key to select
parameter P2.1.
5. The display shows the electrode
offset value (the mV offset at pH
7.00). If you have not calibrated at
any buffer, the primary display
shows 0.0 mV.
See figure
6. Press the ENTER key to select
parameter P2.2.
7. The display shows electrode slope
in percentage. Slope displayed is
the average slope based on the pH
calibrations. Default setting is 100.0.
See figure
8. Press the ENTER key to return to
the subgroup menu. Press the CAL/
MEAS key to return to measurement
mode.
P2.0: Viewing pH electrode data
Program 2 has two “view only”options that lets you check the pH electrode
parameters for diagnostic purposes. It lets you view:
P2.1: Electrode offset
P2.2: Electrode slope
A
A
B
B
6.3
C
C
From measurement mode:
1. Press the Mode key to select pH
measurement mode.
2. Press the Set up key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P1.0.
See figure
4. Press the ENTER key repeatedly
to view previous calibration data.
P1.1 = pH 1.68
P1.2 = pH 4.01
P1.3 = pH 7.00 USA (pH 6.86 NIST)
P1.4 = pH 10.00 USA (pH 9.18 NIST)
P1.5 = pH 12.45
See figure
5. When you have scrolled through
all calibration data, you will
automatically return to the subgroup
menu. Press the CAL/MEAS key
to return to measurement mode.
Notes
If there is no previous calibration data
at a particular point, the primary dis-
play will show “– – –”.
See figure
See Set-up Program P3.3 (page 30) for
information on selecting USA or NIST
pH buffer sets.
P1.0: Viewing previous pH calibration data
This mode lets you recall previous pH calibration data, which lets you know at which
points this meter was previously calibrated. This is a “view only” mode.
6.2
A
A
B
B
C
C

2928
From measurement mode
1. Press the Mode key to select pH
measurement mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P3.0.
See figure
4. Press the ENTER key twice to
select parameter 3.2.
See figure
5. Press the ▲and ▼keys to select
2, 3, 4, or 5 point pH calibration.
6. Press the ENTER key to confirm
selection and to proceed to step 5 of
P.3.3. Press the CAL/MEAS key twice
to return to measurement mode.
C
C
D
D
P3.2: Selecting number of pH calibration points
Program P3.2 lets you select the number of pH calibration points the meter will use
in calibration mode: 2, 3, 4, or 5. The meter will automatically exit calibration mode
after you have calibrated to your selected number of points.
From measurement mode
1. Press the Mode key to select pH
measurement mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P3.0.
See figure
4. Press the ENTER key to select
parameter 3.1.
See figure
5. Press the ▲and ▼keys to select
the configuration you require.
• OFF switches the READY
indicator off.
• ON switches the READY
indicator on.
• ON and HOLD together switches
the auto endpoint feature on.
6. Press the ENTER key to confirm
selection and to proceed to step 4 of
P.3.2. Press the CAL/MEAS key twice
to return to measurement mode.
P3.0: pH measurement configuration
P3.1: READY indicator and auto endpoint function
This program lets you select:
• “READY indicator on” to indicate when the reading is stable.
• “READY indicator off” for faster meter response.
• Auto endpoint function on. Select auto endpoint on to “hold” the reading when
it is stable for more than 5 seconds. The display automatically freezes, and the
HOLD indicator appears on the left side of the display. Press the HOLD key to
release the display and access other functions.
6.4
A
A
B
B
Notes
Meter default is set for Ready indicator on, and auto endpoint function off.
You can also change the Ready indicator and auto endpoint function in Program P7.1
(available from conductivity/TDS mode). Changes made to the Ready indicator/auto
endpoint function in pH mode also apply to conductivity mode, and vice versa.

30 31
P3.4 Selecting °C or °F
This meter lets you select between °C and °F units for temperature readings.
From measurement mode
1. Press the Mode key to select
pH measurement mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P3.0.
See figure
4. Press the ENTER key four times
to select parameter 3.4.
See figure
5. Press the ▲and ▼keys to toggle
between °C and °F.
6. Press the ENTER key to confirm
selection and to return to the
subgroup menu. Press the CAL/
MEAS key to return to measurement
mode.
G
G
H
Notes
You can also switch between °C and °F in Program P7.2 (available from conductivity/
TDS mode). If you switch between °C and °F in pH mode, the meter will also switch in
conductivity mode.
H
P3.3: Selecting NIST or USA buffer sets
Program P3.3 lets you select between the following calibration buffer sets:
USA: pH 1.68, 4.01, 7.00, 10.00, 12.45
NIST: pH 1.68, 4.01, 6.86, 9.18, 12.45
Factory default is the USA buffer set.
From measurement mode
1. Press the Mode key to select pH
measurement mode.
2. Press SET key to enter Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P3.0.
See figure
4. Press the ENTER key three times to
select parameter 3.3.
See figure
5. Press the ▲and ▼keys to toggle
between USA and NIST buffer sets.
6. Press the ENTER key to confirm
selection and to proceed to step 5 of
P.3.4. Press the CAL/MEAS key to
return to measurement mode.
E
E
F
F

3332
From measurement mode:
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press the Set up key to enter
Set Up mode.
See figure
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P5.0.
4. Press the ENTER key repeatedly
to view previous calibration data.
Range Conductivity: TDS:
P5.1 (R1) 0.00-19.99 µS 0.00-9.99 ppm
P5.2 (R2) 0.0-199.9 µS 10.0-99.9 ppm
P5.3 (R3) 0-1999 µS 100-999 ppm
P5.4 (R4) 0.00-19.99 mS 1.00-9.99 ppt
P5.5 (R5) 0.0-199.9 mS 10.0-199.9 ppt
See figure
5. When you have scrolled through
all calibration data, you will
automatically return to the
subgroup menu. Press the
CAL/MEAS key to return to
measurement mode.
Notes
If there is no previous calibration data at
a particular point, the primary display
will show “– – –”.
See figure
P5.0: Viewing previous conductivity/TDS calibration data
This mode lets you recall previous conductivity or TDS calibration data, which lets
you know at which points this meter was previously calibrated. This is a “view only”
mode.
TDS values are proportional to conductivity values. If you calibrate a TDS value
in an equivalent conductivity range, the TDS value will replace the previous
conductivity value, and vice versa.
6.6
A
A
B
C
C
B
Notes
To reset all conductivity and TDS data, see page 41.
See page 50 for a table of factory default settings.
P4.0: Resetting to factory default settings (pH)
This program lets you reset all pH parameters to factory default settings. This
clears all calibration data any other pH setup functions you might have changed.
The following settings will remain as you have set them:
• Temperature unit of measure (°C or °F)
• The temperature offset calibration value
• All conductivity/TDS calibration data and parameters
A
B
6.5
From measurement mode
1. Press the Mode key to select pH
measurement mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter “P4.0” in the lower display.
See figure
4. Press the ENTER key.
See figure
5. Press the ▲and ▼keys to toggle
between NO and YES.
• NO retains current settings
• YES resets to factory
default settings
6. Press the ENTER key to confirm
selection and to return to
measurement mode.
A
B

3534
From measurement mode
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P7.0.
See figure
4. Press the ENTER key to select
parameter 7.1.
See figure
5. Press the ▲and ▼keys to select the
configuration you require.
•ON switches the READY
indicator on.
•OFF switches the READY
indicator off.
•ON and HOLD together switches
the auto endpoint feature on.
6. Press the ENTER key to confirm
selection and to proceed to step 4 of
P.7.2. Press the CAL/MEAS key twice
to return to measurement mode.
P7.0: Conductivity/TDS measurement configuration
P7.1: READY indicator and auto endpoint function
This program lets you select:
• “READY indicator on” to indicate when the reading is stable.
• “READY indicator off” for faster meter response.
• Auto endpoint function on. Select auto endpoint on to “hold” the reading when
it is stable for more than 5 seconds. The display automatically freezes, and the
HOLD indicator appears on the left side of the display. Press the HOLD key to
release the display and access other functions.
6.8
A
A
B
B
Notes
Meter default is set for Ready indicator on, and auto endpoint function off.
You can also change the Ready indicator and auto endpoint function in Program P3.1
(available from pH mode). Changes made to the Ready indicator/auto endpoint
function in conductivity mode will also apply to pH mode, and vice versa.
From measurement mode:
1. Press the Mode key to select
conductivity or TDS measurement
mode.
1. Press the Set up key to enter Set Up
mode.
2. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P6.0.
See figure
3. Press the ENTER key repeatedly
to view the effective cell constant for
each range.
Range Conductivity: TDS:
P6.1 (R1) 0.00-19.99 µS 0.00-9.99 ppm
P6.2 (R2) 0.0-199.9 µS 10.0-99.9 ppm
P6.3 (R3) 0-1999 µS 100-999 ppm
P6.4 (R4) 0.00-19.99 mS 1.00-9.99 ppt
P6.5 (R5) 0.0-199.9 mS 10.0-199.9 ppt
See figure
P6.0: Viewing conductivity/TDS probe data
Program 6 has five "view only" options that let you check your conductivity/TDS
probe’s parameters for diagnostic purposes. These options show you the effective cell
constant for each range. The cell constant is adjusted according to your calibration.
6.7
A
A
B
B
4. When you have scrolled through all probe data, you will automatically return to
the subgroup menu. Press the CAL/MEAS key to return to measurement mode.
Notes
Cell constants will degrade with time and usage. You can use this feature to alert
you to when your probe needs cleaning or to when you need to replace your probe.

3736
P7.3 Selecting Automatic or Manual Temperature Compensation
This feature lets you select between Automatic Temperature Compensation (ATC)
and Manual Temperature Compensation for conductivity by deactivating the
temperature sensor in the conductivity/TDS probe. Meter default is ATC on.
From measurement mode
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press Setup key to enter Set Up
mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P7.0.
See figure
4. Press the ENTER key three times to
select parameter 7.3. The upper
display shows “ATC” and the lower
display shows “P7.3”.
See figure
5. Press the ENTER key again. The
upper display shows “ATC” and the
lower display shows “YES” or “NO”.
See figure
6. Press the ▲and ▼keys to select the
Automatic Temperature
Compensation on of off.
• YES = ATC on
• NO = ATC off
(manual compensation)
7. Press the ENTER key to confirm
selection and to proceed to step 4 of
P7.4. menu. Press the CAL/MEAS key
twice to return to measurement mode.
E
E
F
F
G
G
P7.2 Selecting °C or °F
This meter lets you select between °C and °F units for temperature readings.
From measurement mode
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P7.0.
See figure
4. Press the ENTER key four times to
select parameter 7.2.
See figure
5. Press the ▲and ▼keys to toggle
between °C and °F.
6. Press the ENTER key to confirm
selection and to proceed to step 4 of
P7.3. Press the CAL/MEAS key twice
to return to measurement mode.
C
C
D
Notes
You can also switch between °C and °F in Program P3.4 (available from pH mode).
If you switch between °C and °F in conductivity mode, the meter will also switch in
pH mode.
D

3938
P8.0: Temperature Settings
P8.1 Selecting the temperature coefficient
The temperature coefficient is the amount of change in conductivity per degree of
temperature; it is expressed in percent per °C or °F. Entering the exact temperature
coefficient of your solution lets you accurately compensate temperature for almost
any solution*. You can adjust 0.0 to 10.0% per °C or °F. Meter default is 2.1% per
°C or °F.
From measurement mode
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P8.0.
See figure
4. Press the ENTER key to select
parameter 8.1. The display shows
“T.CO” on the upper display.
See figure
5. Press the ENTER key again.. The
upper display shows the temperature
coefficient and the lower display
shows “T.CO”.
See figure
6. Press the ▲and ▼keys to select
the temperature coefficient of your
solution.
7. Press the ENTER key to confirm
selection and to proceed to step 4 of
P.8.2. Press the CAL/MEAS key twice
to return to measurement mode.
A
A
B
B
C
C
6.9
Notes
* If you do not know the temperature coefficient of your solution you can determine
the correct value using the formula in Appendix 3
“Calculating Temperature
Coefficients” on page 49.
P7.4 Setting the TDS factor
As the concentration of dissolved salts in solution increases, the conductivity
increases. This relationship varies from salt to salt and is roughly linear over a
given range for a given salt. The TDS conversion factor is used by the meter to
convert conductivity to TDS. It is important to use the appropriate TDS factor
for accurate TDS values.
To determine the conductivity to TDS conversion factor for your solution:
• Appendix 1 on page 47 lists some commonly used conversion factors.
• Appendix 2 on page 48 describes how to calculate the TDS conversion factor
for other solutions.
You can set the TDS conversion factor between 0.4 and 1.0; meter default is 0.5.
From measurement mode
1. Press the Mode key to select
conductivity or TDS measurement
mode.
2. Press Setup key to enter
Set Up mode.
3. Press the ▲and ▼keys to scroll
through subgroups until you view
parameter P7.0.
See figure
4. Press the ENTER key five times to
select parameter 7.4. The upper
display shows “tdS” and the lower
display shows “P7.4”.
See figure
5. Press the ENTER key again. The
upper display shows a value and
the lower display shows “tdS”.
See figure
6. Calculate the TDS factor of your
solution. See Appendix 2 on page 48
for information on how to calculate
the TDS factor.
H
H
I
I
J
J
7. Press the ▲and ▼keys to select your calculated TDS conversion factor.
8. Press the ENTER key to confirm selection and to return to the subgroup menu.
Press the CAL/MEAS key to return to measurement mode.