Martini Instruments Mi 160 User manual

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Bench MeterBench Meter
Bench MeterBench Meter
Bench Meter
Mi 160
pH/mV/ISE/TpH/mV/ISE/T
pH/mV/ISE/TpH/mV/ISE/T
pH/mV/ISE/Temperatureemperature
emperatureemperature
emperature
INSTRUCTION MANUAL

Instruction Manual Mi 160 Bench Meter
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GENERAL DESCRIPTION ............................................................................................. 4
FUNCTIONAL DESCRIPTION ....................................................................................... 2
SPECIFICATIONS ....................................................................................................... 5
OPERATIONAL GUIDE ................................................................................................ 6
pH CALIBRATION ....................................................................................................... 9
pH BUFFER TEMPERATURE DEPENDENCE ................................................................... 12
RELATIVE mV CALIBRATION ....................................................................................... 13
ISE CALIBRATION ..................................................................................................... 14
GOOD LABORATORY PRACTICE (GLP) ....................................................................... 16
LOGGING .............................................................................................................. 21
SETUP .................................................................................................................... 26
mV CALIBRATION .................................................................................................... 28
TEMPERATURE CALIBRATION ..................................................................................... 29
PC INTERFACE ......................................................................................................... 30
ELECTRODE CONDITIONING & MAINTENANCE ......................................................... 32
TROUBLESHOOTING ............................................................................................... 33
ACCESSORIES ......................................................................................................... 34
DISPLAYDISPLAY
DISPLAYDISPLAY
DISPLAY
A. PRIMARY DISPLAY
B. MEASURING UNIT FOR PRIMARY
DISPLAY
C. CALIBRATION MESSAGES
D. MEMORIZED pH CALIBRATION
BUFFERS
E. CALIBRATION TAGS
F. MODE INDICATORS
G. REQUIRE USER CONFIRMATION
H. CALIBRATION MESSAGES
I. TEMPERATURE COMPENSATION
MODE INDICATOR
J. SECONDARY DISPLAY
K. MEASURING UNIT FOR
SECONDARY DISPLAY
L. CALIBRATION REQUESTED
FUNCTIONAL DESCRIPTION
A
B
C
D
E
F
G
H
I
J
K
L
B

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FUNCTIONAL DESCRIPTION
pH / mV / ISE / Temperature MeterBench
Mi 160
SETUP
RANGE
LOG
CLR
ACCEPT
GLP
ON/OFF
MRCAL
MARTINI
instruments
2
3
4
9
7
1
5
10
11
8
6
14 15
16
17
RS232
USB
pH/ORP
Ref.
Temp.
Power
12Vdc
12
13
FRONT PANELFRONT PANEL
FRONT PANELFRONT PANEL
FRONT PANEL
1. Liquid Crystal Display (LCD)
2. CAL key, to enter/exit calibration mode
3. MR key, to enter/exit memory recall
4. GLP/ACCEPT key, to display GLP data
or to confirm value
5. LOG/CLR key, to store reading in
memory or to clear calibration
6. SETUP key, to enter/exit setup mode
or to toggle between delete one and
all logged data
7. RANGE key, to select measurement
range or to switch focused data.
8. UP and DOWN arrow keys, to manu-
ally increase/decrease temperature or
other parameters value
9. ON/OFF key, to turn the meter ON and
OFF
10. Secondary LCD
11. Primary LCD
REAR PANELREAR PANEL
REAR PANELREAR PANEL
REAR PANEL
12. USB connector
13. RS232 connector
14. Power supply socket
15. Reference electrode socket
16. BNC electrode connector
17. Temperature probe socket

Instruction Manual Mi 160 Bench Meter
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GENERAL DESCRIPTION
Thank you for choosing Martini Instruments. This instruction manual will provide you the
necessary information for correct use of the meter.
Mi 160Mi 160
Mi 160Mi 160
Mi 160 is a logging microprocessor-based pH, ORP, ISE and temperature bench meter.
This meter is provided with a series of new diagnostic features which add an entirely
new dimension to the measurement of pH/ORP/ISE, by allowing the user to dramati-
cally improve the reliability of the measurement:
• 7 memorized buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) for pH
calibration
• pH calibration up to 3 points
• ISE calibration up to 2 points; six standard solutions available: 0.01, 0.1, 1, 10,
100, 1000 ppm
• Messages on the LCD to make the calibration easy and accurate
• Relative mV feature
• GLP feature, to view last calibration data for pH or ISE
• User-selectable alarm time out to alert the user that too much time elapsed since
the last pH calibration
• Log-on-demand (50 samples for each range: pH, mV/Rel mV, ISE)
Moreover, it offers an extended temperature range from –20 °C (–4 °F) to 120 °C
(248 °F), using MA 831RMA 831R
MA 831RMA 831R
MA 831R interchangeable temperature probe.
For accurate measurements, use the electrode holder supplied with the meter.
This Bench Meter is supplied with:
• MA 917B/1 pH Electrode
• MA 831R Temperature Probe
• MA 9315 Electrode Holder
• M 10004 pH 4.01 Sachet Buffer Solution
• M 10007 pH 7.01 Sachet Buffer Solution
• M 10010 pH 10.01 Sachet Buffer Solution
• M 10016 Sachet Electrode Cleaning Solution
• Mi 5200 Application Software
• MA 9350 RS232 Connector cable (2 meters)
• Graduate Pipet •12 VDC Adapter • Instruction Manual

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SPECIFICATIONS
Range -2.00 to 16.00 pH
±699.9 mV / ±2000 mV
0.001 to 19999 ppm (ISE)
-20.0 to 120.0 °C (-4.0 to 248.0 °F)
Resolution 0.01 pH
0.1 mV / 1 mV
0.001 (0.001 to 9.999) ppm
0.01 (10.00 to 99.99) ppm
0.1 (100.0 to 999.9) ppm
1 (1000 to 19999) ppm
0.1 °C (0.1 °F)
Accuracy ±0.01 pH
(@20°C/68°F) ±0.2 mV / ±1 mV
±0.5% F.S. (ISE)
±0.4 °C (±0.8 °F)
Rel mV offset ±2000 mV
pH Calibration 1, 2 or 3 points calibration, with 7 memorized buffers
ISE Calibration 1 or 2 points calibration, 6 standard solutions available
Temperature Automatic, from -20.0 to 120.0 °C (-4.0 to 248.0 °F)
Compensation or manual, without temperature probe
pH Electrode MA 917B/1 (included)
Temperature Probe MA 831R (included)
Input Impedance 1012 ohm
Power supply 12 VDC power adapter
Dimensions 230 x 160 x 95 mm (9.0 x 6.3 x 3.7")
Weight 1.1 kg (2.4 lb.)
Environment 0 to 50 °C ; max RH 95%
Warranty 3 years
This instrument is in compliance with the CE Directives.

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OPERATIONAL GUIDE
INITIAL PREPARATIONINITIAL PREPARATION
INITIAL PREPARATIONINITIAL PREPARATION
INITIAL PREPARATION
Plug the 12 VDC adapter to the power supply socket. To prepare the instrument for use,
connect the pH electrode to the BNC connector and the temperature probe to the
appropriate socket on the rear panel of the instrument. The temperature probe is used in
conjunction with the pH electrode to utilize the instrument's ATC capability, but it can
also be used independently to take temperature measurements.
For electrodes with a separate reference, connect the electrode’s BNC to the BNC
connector and the reference electrode plug to the reference socket.
For temperature measurements and automatic temperature compensation connect the
temperature probe to the appropriate socket. After measurement switch the meter off,
clean the electrode and store it with a few drops of MA9015MA9015
MA9015MA9015
MA9015 storage solution in the
protection cap. The auto-off feature turns the meter off after 20 minutes of non-use. To
disable this feature, see SETUP menu on page 26.
The instrument enters the same range and mode as it was at power off, while the “OPEN”
tag and the “ ” and “ ” symbols from the electrode blink on the LCD for a few seconds to
remind the user to unscrew the electrode refilling cap, and to remove the protective cap
before taking measurements.
pHpH
pHpH
pH MEASUREMENTSMEASUREMENTS
MEASUREMENTSMEASUREMENTS
MEASUREMENTS
Make sure the instrument has been calibrated before taking pH measurements.
• Submerge the tip of the electrode (4cm/1½") and the temperature probe into the
sample to be tested and stir gently. Allow for the electrode to stabilize.
• If necessary, press the RANGE key until the display changes to pH mode.
• The pH measurement is displayed on the primary LCD and the temperature on the secondary
LCD.
• If the reading is out of range, the closest full-scale value will blink on the primary LCD.

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The display will show the default temperature of 25 °C or the last temperature reading with
the blinking “MTC” and “°C” (or “°F”) tags.
The temperature can now be adjusted with the UP and DOWN arrow keys (from –20.0 °C to
120.0 °C).
mm
mm
mV / RELV / REL
V / RELV / REL
V / REL mm
mm
mV MEASUREMENTSV MEASUREMENTS
V MEASUREMENTSV MEASUREMENTS
V MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements (see “Accessories”
section).
Oxidation-Reduction Potential (ORP) measurements provide the quantification of the oxidizing or
reducing power of the tested sample.
To perform an ORP measurement correctly, the surface of the electrode must be clean and
smooth.
• If necessary, press the RANGE key until the display changes to mV/Rel mV.
• Submerge the ORP electrode tip (4cm/1½") into the sample to be tested and allow a
few seconds for the reading to stabilize.
• The instrument displays the mV reading on the primary LCD or Rel mV reading if a Rel mV
calibration has been performed and the temperature on the secondary LCD.
If measurements are taken successively in different samples, it is recommended to rinse the
electrode thoroughly with water and then with some of the sample to be tested.
The pH reading is affected by temperature. In order to measure the pH accurately, the
temperature effect must be compensated. To use the Automatic Temperature Compensation
(ATC) feature, connect and submerge the MA 831RMA 831R
MA 831RMA 831R
MA 831R temperature probe into the sample as
close as possible to the electrode and wait for a few seconds. The “ATC” tag will be
displayed.
If Manual Temperature Compensation (MTC) is desired, the temperature probe must be
disconnected from the instrument.

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NotesNotes
NotesNotes
Notes:
•When the reading is out of range, the closest full-scale value is displayed blinking.
•If using a pH electrode while in mV mode, the instrument will measure the mV generated by the
pH electrode.
•If the instrument displays a Rel mV reading and it is desired to take mV measurements,
simply clear the Rel mV calibration (see Rel mV calibration section at page 17).
ISEISE
ISEISE
ISE MEASUREMENTSMEASUREMENTS
MEASUREMENTSMEASUREMENTS
MEASUREMENTS
• Press the RANGE key to enter ISE measurement mode.
• Submerge the tip of the ISE electrode (4 cm/1½") into the sample to be tested and allow a
few seconds for the reading to stabilize.
• The instrument displays the ppm reading on the primary LCD and the temperature on the
secondary LCD.
or

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pH CALIBRATION
It is recommended to calibrate the instrument frequently, especially if high accuracy is
required.
The pH calibration is also necessary in the following cases:
a) Whenever the pH electrode is replaced.
b) At least once a week.
c) After testing aggressive chemicals.
d) When extreme accuracy is required.
e) If “CALIBRATION EXPIRED” tag is blinking during measurement.
Every time you calibrate the instrument use fresh buffers and perform an electrode Cleaning
Procedure (see page 42).
PROCEDUREPROCEDURE
PROCEDUREPROCEDURE
PROCEDURE
One, two or three points calibration can be performed, from the 7 memorized buffers (1.68,
4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH).
• Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration
use two beakers for each buffer solution, the first one to rinse the electrode and the second
one for calibration.
• Remove the protective cap and rinse the electrode with some of the buffer solution to be
used for the first calibration point.
THREE-POINT CALIBRATIONTHREE-POINT CALIBRATION
THREE-POINT CALIBRATIONTHREE-POINT CALIBRATION
THREE-POINT CALIBRATION
• Immerse the pH electrode and the temperature probe approximately 4 cm (1½”) into a buffer
solution of your choice (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 or 12.45) and stir gently. The
temperature probe should be close to the pH electrode.
• Press the CAL key. The “CAL”, “1” and “CALIBRATION” tags will appear and the
secondary LCD will display buffer “7.01”.

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• If necessary, press the UP and DOWN arrow keys to select a different buffer value.
• The “WAIT” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected buffer, the “READY” and “ACCEPT” tags
will blink on the LCD.
• Press the GLP/ACCEPT key to confirm calibration.
• The calibrated value will be displayed on the primary LCD and the second expected buffer
value on the secondary LCD, along with the tag of the buffer already calibrated.
• After the first calibration point is accepted, immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into the second buffer solution and stir gently. The
temperature probe should be close to the pH electrode.
• If necessary, press the UP and DOWN arrow keys to select a different buffer value.
• The “WAIT” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected buffer, the “READY” and “ACCEPT” tags
will blink on the LCD.
• Press the GLP/ACCEPT key to confirm calibration.
• The calibrated value will be displayed on the primary LCD and the third expected buffer value
on the secondary LCD, along with the tags of the buffers already calibrated.

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• After the second calibration point is accepted, immerse the pH electrode and the tempera-
ture probe approximately 4 cm (1½”) into the third buffer solution and stir gently. The
temperature probe should be close to the pH electrode.
• If necessary, press the UP and DOWN arrow keys to select a different buffer value.
• The “WAIT” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected buffer, the “READY” and “ACCEPT” tags
will blink on the LCD.
• Press the GLP/ACCEPT key to confirm calibration.
• The instrument stores the calibration values and returns to normal measurement mode.
NotesNotes
NotesNotes
Notes:
•The instrument automatically skips the buffers already used for the previous calibration points
to avoid erroneous procedure.
•If the value measured by the instrument is not close to the selected buffer, “WRONG BUFFER”
and “WRONG PROBE” messages will blink alternately. In this case, check if the correct buffer
has been used or regenerate the electrode by following the Cleaning Procedure (see page
33). If necessary, change the buffer or the electrode.
•If “WRONG BUFFER” and “Old” messages on the secondary LCD are displayed blinking, an
inconsistency between new and previous (old) calibration is detected. Clear calibration
parameters by pressing the LOG/CLR key and proceed with calibration from the current
calibration point (the instrument will keep all confirmed values during current calibration).
•The “WRONG BUFFER” message and the temperature value blink if temperature reading is
out of the defined temperature range for the buffer. Calibration cannot be confirmed in this
situation.
•Press the RANGE key to display the temperature reading during calibration.
•To clear a previous calibration and return to the default values, press the LOG/CLR key at any
time after entering calibration mode. The LCD will show “CLr CAL” for one second, and then
the meter will return to normal measurement mode.

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1 OR 2 POINT CALIBRATION
• Proceed as described in “Three-point calibration” section.
• Press the CAL key after the appropriate calibration point is accepted.
The instrument will return to measurement mode, will memorize the calibration data, and the
appropriate tags for the calibrated buffers will be displayed on the LCD only if the “disp” option
from the SETUP menu is ON (see page 32).
pH BUFFER TEMPERATURE DEPENDENCE
The temperature has an effect on pH. The calibration buffer solutions are affected by
temperature changes to a lesser degree than normal solutions. During calibration the
instrument will automatically calibrate to the pH value corresponding to the measured or set
temperature.
During calibration the instrument will display the pH buffer value at 25 °C.
TEMP pH BUFFERS
°C °F 1.68 4.01 6.86 7.01 9.18 10.01 12.45
032
1.67 4.01 6.98 7.13 9.46 10.32 13.38
541
1.67 4.00 6.95 7.10 9.39 10.24 13.18
10 50 1.67 4.00 9.92 7.07 9.33 10.18 12.99
15 59 1.67 4.00 6.90 7.05 9.27 10.12 12.80
20 68 1.68 4.00 6.88 7.03 9.22 10.06 12.62
25 77 1.68 4.01 9.86 7.01 9.18 10.01 12.45
30 86 1.68 4.02 6.85 7.00 9.14 9.96 12.29
35 95 1.69 4.03 6.84 6.99 9.11 9.92 12.13
40 104 1.69 4.04 6.84 6.98 9.07 9.88 11.98
45 113 1.70 4.05 6.83 6.98 9.04 9.85 11.83
50 122 1.71 4.06 6.83 6.98 9.01 9.82 11.70
55 131 1.72 4.08 6.84 6.98 8.99 9.79 11.57
60 140 1.72 4.09 6.84 6.98 8.97 9.77 11.44
65 149 1.73 4.11 6.84 6.99 8.95 9.76 11.32
70 158 1.74 4.12 6.85 6.99 8.93 9.75 11.21
75 167 1.76 4.14 6.86 7.00 8.91 9.74 11.10
80 176 1.77 4.16 6.87 7.01 8.89 9.74 11.00
85 185 1.78 4.17 6.87 7.02 8.87 9.74 10.91
90 194 1.79 4.19 6.88 7.03 8.85 9.75 10.82
95 203 1.81 4.20 6.89 7.04 8.83 9.76 10.73

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RELATIVE mV CALIBRATION
• Press the CAL key when the instrument is in mV / Rel mV measurement mode. The
“CALIBRATION” tag will appear on the LCD.
• Relative mV value is displayed on the primary LCD and the absolute mV value on the
secondary LCD.
• The “WAIT” tag will blink until the reading is stable.
• When the absolute reading is stable and in measurement range, the “READY” and
“ACCEPT” tags blink on the LCD, asking for confirmation.
• If the reading is out of range, the absolute mV value and the “WRONG” tag will blink.
• Press the GLP/ACCEPT key to confirm the calibration. The instrument enters Rel mV
measurement mode.
NotesNotes
NotesNotes
Notes:
•If a Rel mV calibration is performed, the range changes from mV to Rel mV.
•To return to mV measurement mode, clear the Rel mV calibration by pressing LOG/CLR
after entering calibration mode. The “CLr CAL” message will appear on the LCD for one
second and the instrument will enter mV measurement mode.

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ISE CALIBRATION
For greatest accuracy, it is recommended to calibrate the instrument frequently.
Due to electrode conditioning time, the electrode must be kept immersed a few seconds to
stabilize.
PROCEDUREPROCEDURE
PROCEDUREPROCEDURE
PROCEDURE
One or two-point calibration can be performed, with six memorized standards: 0.01, 0.1, 1,
10, 100 and 1000 ppm.
In SETUP menu, select the proper ion charge.
NoteNote
NoteNote
Note: If “UndF” option is selected in SETUP menu, calibration must be performed in two
points, otherwise “----” will be displayed on the LCD if exiting calibration after
accepting the first used standard.
• Pour small quantities of the standard solutions into clean beakers. If possible, use plastic beakers
to minimize any EMC interferences. For accurate calibration use two beakers for each standard
solution: one to rinse the electrode and one for calibration.
• Select ISE measurement range by pressing the RANGE key. Remove the protective cap from
the ISE electrode
TWO-POINT CALIBRATIONTWO-POINT CALIBRATION
TWO-POINT CALIBRATIONTWO-POINT CALIBRATION
TWO-POINT CALIBRATION
• Immerse the ISE electrode approximately 4 cm (1½”) into the selected solution and stir gently.
• Press the CAL key. The primary LCD will display the ppm value using the current offset and
slope. The “CAL”, “BUFFER”, “1”, “CALIBRATION” tags will appear and the “0.010”
ppm standard will be displayed on the secondary LCD.
• If necessary, press the UP and DOWN arrow keys to select a different standard value.
• The “WAIT” tag will blink on the LCD until the reading is stable.

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• When the reading is stable and close to the selected standard, the “READY” and
“ACCEPT” tags will blink.
• Press the GLP/ACCEPT key to confirm calibration.
• The calibrated value will be displayed on the primary LCD and the second expected
standard value on the secondary LCD.
NoteNote
NoteNote
Note: The instrument will automatically skip the standard used for the first point.
• After the first calibration point is accepted, immerse the ISE electrode approximately 4 cm
(1½”) into the second calibration solution.
• If necessary, press the UP and DOWN arrow keys to select the standard value.
• The “WAIT” tag will blink on the LCD until the reading is stable.
• When the reading is stable and close to the selected standard, the “READY” and “ACCEPT”
tags will blink.
• Press the GLP/ACCEPT key to confirm calibration.
• The instrument stores the calibration value and returns to normal measurement mode.
NotesNotes
NotesNotes
Notes:
•If the mV value is out of the mV range (±2000), the closest full-scale value will be displayed
blinking.

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• If the new slope is out of the slope window, “WRONG BUFFER” and “WRONG
PROBE” messages will blink alternately. In this case, check if the correct standard has
been used or refresh the electrode by following the ceaning procedure. If necessary,
change the standard or the electrode.
The slope window is within ±20 mV and ±105 mV if ion charge is not specified
(UndF option in SETUP menu), or between 50% and 120% of default slope for the
corresponding ion charge.
Default slope values (mV/decade):
– 59.16 (monovalent anion) - ion charge is –1
59.16 (monovalent cation) - ion charge is 1
– 29.58 (divalent anion) - ion charge is –2
29.58 (divalent cation) - ion charge is 2
100 - ion charge is “UndF”
• Press LOG/CLR during calibration if you want to clear calibration data and return to
the default values. The instrument will display “CLr CAL” message and then return to
measurement mode.
• Press the RANGE key to display temperature reading during calibration.
ONE-POINT CALIBRATIONONE-POINT CALIBRATION
ONE-POINT CALIBRATIONONE-POINT CALIBRATION
ONE-POINT CALIBRATION
• Press the CAL key after first calibration point is accepted. The instrument memorizes the one-
point calibration data and returns to measurement mode.
GOOD LABORATORY PRACTICE (GLP)
GLP is a set of functions that allows storage and retrieval of calibration data and electrode status.
All data regarding pH and ISE calibration is stored for the user to review when necessary.
CALIBRATION ALARM TIME-OUTCALIBRATION ALARM TIME-OUT
CALIBRATION ALARM TIME-OUTCALIBRATION ALARM TIME-OUT
CALIBRATION ALARM TIME-OUT
For pH calibration, Mi 160 allows the user to set the number of days (1 to 14) before the next
required calibration. The default setting is OFF (disabled).
The instrument checks the time-out and out the time elapsed, the “CALIBRATION EXPIRED”
message will blink as a reminder.
NoteNote
NoteNote
Note: If the instrument is not calibrated, the “CALIBRATION EXPIRED” message will be
displayed even if the calibration time-out feature is disabled in SETUP menu.

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LASTLAST
LASTLAST
LAST pp
pp
pH CALIBRATION DATAH CALIBRATION DATA
H CALIBRATION DATAH CALIBRATION DATA
H CALIBRATION DATA
pH calibration data is stored automatically after a successful calibration.
To view the last pH calibration data, press the GLP/ACCEPT key while in pH measurement mode.
The instrument will display the time (hh:mm:ss) of the last calibration.
Press the arrow keys and the instrument will display the next calibration parameter (pressing
the UP key):
• The date (MM.DD.YYYY).
• The pH calibration slope value on the primary LCD and the offset on the secondary LCD.

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• The pH calibration buffers in calibrating order.
The first pH calibration buffer:
• The second pH calibration buffer:
• The third pH calibration buffer:
NotesNotes
NotesNotes
Notes:
• The “OLd” message displayed beneath the pH value means that this buffer was not
used during last calibration. Press SETUP if you want to see calibration date (or time
if old calibration was performed in the same day with current calibration).

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•The “no BUFFER” message means that the instrument was calibrated in less than three points.
• The meter displays “OFF” if the function is disabled,
or the number of days before the calibration alarm will be displayed (e.g. 5 days), or from
the time calibration expired (e.g. –3 days).
• Instrument Identification Code. When using several identical meters it may be useful to
uniquely identify them by assigning an ID code to each meter.
LASTLAST
LASTLAST
LAST ISEISE
ISEISE
ISE CALIBRATION DATACALIBRATION DATA
CALIBRATION DATACALIBRATION DATA
CALIBRATION DATA
ISE calibration data is stored automatically after a successful calibration.
To view last ISE calibration data, press the GLP/ACCEPT key while in ISE measurement mode.
The instrument will display the time (hh:mm:ss) of the last calibration as in pH GLP mode.
Press the arrow UP key and the instrument will display the following calibration parameters:

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• The date (MM.DD.YYYY) as in pH GLP mode.
• The value slope on the primary LCD and the offset on the secondary LCD.
• The first calibration standard.
• The second calibration standard.
• The instrument ID as in pH GLP mode.
NotesNotes
NotesNotes
Notes:
•The “OLd” message displayed beneath the ppm value means that this standard was not
used during last calibration. Press SETUP if you want to see calibration date (or time if old
calibration was performed in the same day with current calibration).