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INSTRUCTION MANUAL
HI98190, HI98191
Calibration Check
Waterproof
pH/mV/ISE/Temperature Meters
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Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct use
of the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e‑mail
us at tech@hannainst.com or view our worldwide contact list at
www.hannainst.com.
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of
the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.
Dear Customer,
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PRELIMINARY EXAMINATION ..............................................................................................
GENERAL DESCRIPTION ......................................................................................................
FUNCTIONAL DESCRIPTION ................................................................................................
HI98190 SPECIFICATIONS .................................................................................................
HI98191 SPECIFICATIONS .................................................................................................
OPERATIONAL GUIDE .........................................................................................................
pH CALIBRATION ...............................................................................................................
pH BUFFER TEMPERATURE DEPENDENCE ............................................................................
RELATIVE MV CALIBRATION ................................................................................................
ISE CALIBRATION HI98191 ................................................................................................
GOOD LABORATORY PRACTICE (GLP) ...................................................................................
SETUP ..............................................................................................................................
LOGGING ..........................................................................................................................
AUTOEND .........................................................................................................................
mV AND TEMPERATURE CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) ...........................
PC INTERFACE ...................................................................................................................
BATTERIES REPLACEMENT ..................................................................................................
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ......................................................
ELECTRODE CONDITIONING AND MAINTENANCE .................................................................
TROUBLESHOOTING GUIDE ...............................................................................................
TABLE OF CONTENTS
4
5
8
10
23
25
31
45
49
55
58
6
9
14
24
29
44
46
54
56
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Remove the instrument from the packing material and examine it carefully to make sure that no
damage has occurred during shipping. If there is any damage, notify your dealer or the nearest
Hanna Customer Service Center.
Each instrument is supplied with:
• HI12963 Amplified Combined pH temperature electrode (HI98190)
• HI72911B Combined pH temperature electrode (HI98191)
• HI7662 Temperature Probe (HI98191)
• pH 4.01 & 7.01 Buffer Solutions (230 mL each)
• HI700601 General Purpose Cleaning Solution (3 pcs.)
• 100 mL Plastic Beaker (2 pcs.)
• 1.5V AA Batteries (4 pcs.)
• HI92000 PC Software
• HI920015 Micro USB cable
• Instruction Manual and Quick Reference Guide
• Certificate
PRELIMINARY EXAMINATION
Note: Save all packing material until you are sure that the instrument functions correctly. All
defective items must be returned in the original packing with the supplied accessories.
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GENERAL DESCRIPTION
The HI98190 and HI98191 instruments are state‑of‑the‑art, heavy‑duty pH meters, designed to
provide laboratory results and accuracy under harsh industrial conditions.
They are provided with a series of new diagnostic features which add an entirely new dimension
to the measurement of pH, by allowing the user to dramatically improve the reliability of the
measurement:
• seven standard buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) for calibration.
• pH calibration up to five calibration points (see instrument specifications).
• Custom calibration with up to five custom buffers.
• Messages on the graphic LCD for an easy and accurate calibration.
• Cal Check™ Diagnostic features to alert the user when the electrode needs cleaning.
• Optional user enabled “Outside Calibration Range” warning.
• Monitoring of the electrode aging.
• User selectable “Calibration Time Out” to remind when a new calibration is necessary.
Moreover, they offer an extended temperature range from ‑20 to 120 °C (‑4 to 248 °F), using a
temperature sensor inside pH electrode.
These instruments can also measure with ORP electrodes, thanks to their capability to measure mV
with a resolution up to 0.1 mV.
HI98191 can also measure with ISE electrodes. The electrode type unit selection capability and the
ISE calibration in up to five calibration standard solutions make this instrument very useful for a
large range of concentration solutions measurements.
Other features include:
• Relative mV measurements
• Log on demand up to 300 samples for HI98191 and 200 samples for HI98190
(100 samples on each range ‑ pH, mV, ISE only HI98191)
• Auto Hold feature, to freeze first stable reading on the LCD
• GLP feature, to view last calibration data for pH, Rel mV, or ISE
• PC interface
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1) Liquid Crystal Display (LCD).
2) Functional keys.
3) / keys to manually increase/decrease the parameters or to scroll between the parameter
list.
4) ON/OFF ( ) key, to turn the instrument ON and OFF.
5) LIGHT ( ) key to toggle display backlighting.
6) GLP key, to display Good Laboratory Practice information.
7) CAL key, to enter/exit calibration mode.
8) SETUP key, to enter/exit SETUP mode.
9) RCL key, to enter/exit view logged data mode.
10) MODE key to change pH resolution or to toggle between mV and Rel mV mode.
11) RANGE key, to switch between pH and mV range (HI98190) or pH, mV and ISE range
(HI98191).
12) HELP key to enter/exit contextual help.
13) ESC to leave current mode, exit calibration, setup, help. etc.
FRONT VIEW
FUNCTIONAL DESCRIPTION
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14) Electrode DIN connector.
15) USB connector.
TOP VIEW HI98190
FUNCTIONAL DESCRIPTION
TOP VIEW HI98191
14) BNC electrode connector.
15) Input for Reference electrode.
16) Input for Temperature probe.
17) USB Connector.
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HI98190 SPECIFICATIONS
pH
Range ‑2.0 to 20.0 pH / ‑2.00 to 20.00 pH / ‑2.000 to 20.000 pH
Resolution 0.1 pH / 0.01 pH / 0.001 pH
Accuracy ±0.1 pH / ±0.01 pH / ±0.002 pH
mV
Range ±2000 mV
Resolution 0.1 mV
Accuracy ±0.2 mV
Temperature
Range ‑20.0 to 120.0 °C (‑4.0 to 248.0 °F)
Resolution 0.1 °C (0.1 °F)
Accuracy ±0.4 °C (±0.8 °F) (excluding probe error)
Rel mV Offset Calibration ±2000 mV
pH Calibration
Up to five point calibration, seven standard buffers available
(pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45), and five custom
buffers
Slope Calibration From 80 to 110%
Temperature Compensation Manual or Automatic from ‑20.0 to 120.0 °C (‑4.0 to 248.0 °F)
pH Electrode HI12963 pH & temperature
LOG On demand, 200 samples (100 samples on each range)
Input Impedance 10¹² Ω
Battery Type/Life 1.5V AA batteries (4 pcs.) / approx. 200 hours of continuous use
without backlight (50 hours with backlight)
Auto Power Off User selectable: 5, 10, 30, 60 minutes or disabled
PC Interface opto‑isolated USB
Dimensions 185 x 93 x 35.2 mm (7.3 x 3.6 x 1.4”)
Weight 400 g (14.2 oz)
Environment 0 to 50 °C (32 to 122 °F) max. RH 100% IP67
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HI98191 SPECIFICATIONS
pH
Range ‑2.0 to 20.0 pH / ‑2.00 to 20.00 pH / ‑2.000 to 20.000 pH
Resolution 0.1 pH / 0.01 pH / 0.001 pH
Accuracy ±0.1 pH / ±0.01 pH / ±0.002 pH
mV
Range ±2000 mV
Resolution 0.1 mV
Accuracy ±0.2 mV
ISE
Range From 1.00 E‑7 to 9.99 E10 concentration
Resolution 3 digits 0.01, 0.1, 1, 10 concentration
Accuracy ±0.5% of reading (monovalent ions)
±1% of reading (divalent ions)
Temperature ‑20.0 to 120.0 °C (‑4.0 to 248.0 °F)
Rel mV Offset Range
±2000 mV
pH Calibration
Up to five point calibration, seven standard buffers available
(pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45), and five custom
buffers
Slope Calibration From 80 to 110%
ISE Calibration
Up to five point calibration points six standard solutions
available
(0.1, 1, 10, 100, 1000, 10000 ppm)
Temperature Compensation Manual or Automatic from ‑20.0 to 120.0 °C (‑4.0 to 248.0 °F)
pH Electrode HI72911B pH & temperature (included)
LOG On demand, 300 samples (log samples on each range)
Input Impedance 10¹² Ω
Battery Type/Life 1.5V AA batteries (4 pcs.) / approx. 200 hours of continuous use
without backlight (50 hours with backlight)
Auto Power Off User selectable: 5, 10, 30, 60 minutes or disabled
PC Interface opto‑isolated USB
Dimensions 185 x 93 x 35.2 mm (7.3 x 3.6 x 1.4”)
Weight 400 g (14.2 oz)
Environment 0 to 50 °C (32 to 122 °F) max. RH 100% IP67
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OPERATIONAL GUIDE
INITIAL PREPARATION
The instrument is supplied complete with 1.5V AA (4 pcs.) batteries. For placing the batteries inside
the meter, see page 54.
To prepare the instrument for field measurements close the serial communication socket and all
unused connector sockets with proper stopper (to ensure waterproof protection). Use the holed
temperature rubber cork for the temperature socket when temperature probe is connected.
For HI98191 connect the pH electrode and the temperature probe to the BNC and temperature
sockets on the top of the instrument. Push the pH electrode sleeve to cover the connector
accommodation.
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. If the probe is
disconnected, temperature can be set manually with the / keys.
For HI98190 connect the pH/temperature electrode to the DIN connector.
Turn the instrument ON by pressing ON/OFF key.
At start‑up the display will show the Hanna logo for a few seconds followed by the percentage
indication of the remaining battery life, then enters the measurement mode.
After measurement switch the instrument off, clean the electrode and store it with a few drops of
HI70300 storage solution in the protective cap (see page 57).
The Auto Power Off feature turns the instrument off after a set period (default 30 min) with no button
pressed to save battery life. To set another period or to disable this feature, see SETUP menu on
page 31.
The Auto Light Off backlight feature turns the backlight off after a set period (default 1 min) with
no buttons pressed. To set another period or to disable this feature, see SETUP menu on page 31.
pH MEASUREMENTS
To take a pH measurement remove the electrode protective cap and simply submerge the tip of the
electrode (4 cm/1½") into the sample to be tested.
Press RANGE key until the display changes to the pH range, if necessary.
Use MODE key to select the pH resolution.
Allow for the electrode to adjust and reading to stabilize (hourglass symbol turns off).
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OPERATIONAL GUIDE
• pH reading with the selected resolution.
• Temperature reading in the selected unit (°C or °F).
• Temperature compensation mode (MTC ‑ manual, ATC ‑ automatic). While in MTC mode the
indicate that the temperature can be manually changed using / keys.
• Electrode condition during the calibration day.
• The buffers used in last pH calibration (if feature is enabled in SETUP).
• Battery level indicator.
• Available functional keys in accordance with the model.
In order to take more accurate pH measurements, make sure that the instrument is calibrated
(see page 14 for calibration details).
It is recommended that the electrode is always kept moist and rinsed thoroughly with the sample to
be measured before use.
The pH reading is directly affected by temperature. For accurate pH measurements, temperature
must be taken into consideration. If the sample temperature is different from the temperature at
which the pH electrode was kept, allow a few minutes to reach thermal equilibrium.
To use the instrument's Automatic Temperature Compensation (ATC) feature, submerge the
temperature probe into the sample as close to the electrode as possible and wait for a few seconds.
If manual temperature compensation (MTC) is desired, the temperature probe must be
disconnected from the instrument (HI98191 only).
The display will show the default temperature of 25 °C, the last measured temperature reading, or
the last set temperature, with the “MTC” indication.
The “MTC” indication and the symbol light up on the LCD to indicate that the instrument is in MTC
mode and the / keys can be used to enter the desired temperature value.
Note: When in MTC the user can press and hold the / keys, and the instrument will
start incrementing /decrementing the temperature value. The instrument keeps measuring
and the display is updated periodically.
On the pH screen are displayed:
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ORP MEASUREMENTS
To perform ORP measurements, connect an optional ORP electrode to the instrument and turn it ON.
Press RANGE key until mV range is displayed, if necessary.
Submerge the ORP electrode tip (4 cm/1½”) into the sample to be tested and wait a
few seconds for the reading to stabilize.
Measurements are displayed with 0.1 mV resolution.
The “ATC” (or “MTC”) message is turned off because mV readings are not temperature
compensated.
For accurate ORP measurements, the surface of the electrode must be clean and smooth.
Pretreatment solutions are available to condition the electrode and improve its response time.
RELATIVE mV MEASUREMENTS
To enter Relative mV mode, press MODE while in mV measurement mode. The relative mV reading
will be displayed along with the Absolute mV value and the current temperature readings.
The relative mV reading is equal to the difference between the absolute mV input value and relative
mV offset established in the relative mV calibration.
Note: If using the pH electrode while in mV mode, the instrument will measure the mV
generated by the pH electrode.
ISE MEASUREMENTS (HI98191 only)
To perform ion concentration measurements, connect an optional ISE electrode and
the corresponding reference (if necessary) to the instrument and turn it ON.
Enter the ISE mode by pressing RANGE until the display changes to ISE range.
Submerge th e ISE electrode tip (4 cm/1½”) into the sample to be tested and wait a
few seconds for the reading to stabilize.
OPERATIONAL GUIDE
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OPERATIONAL GUIDE
The ISE reading will be displayed along with the current temperature reading.
The “ATC” (or “MTC”) message is turned off because ppm readings are not temperature
compensated.
In order to take accurate ISE measurements, make sure that the appropriate ISE electrode type and
ISE unit were set in SETUP menu and the instrument was calibrated (see ISE CALIBRATION for
details, page 25).
Notes: When the reading is out of range, the display will flash the closest full-scale value.
The instrument will display “----” on the primary LCD if it is not calibrated. Perform at least
a one point calibration in order to take ISE measurements.
Changing the ISE electrode or the ion charge will need ISE range calibration.
TEMPERATURE MEASUREMENTS
For HI98190 the temperature sensor is connected through DIN socket.
Connect the temperature connector to the appropriate socket (HI98191). Immerse the pH electrode
into the sample and allow the reading on the secondary LCD to stabilize.
Note: The temperature can be displayed in Celsius degrees (°C) or in Fahrenheit degrees
(°F) (see SETUP for details, page 31).
BACKLIGHT FEATURE
The instrument is provided with a Backlight feature, which can be easily toggled on and off through
the keyboard by pressing LIGHT.
Note: The backlight automatically shuts off after a set period (see SETUP for details,
page 31) with no buttons pressed.
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pH CALIBRATION
It is recommended to calibrate the instrument frequently, especially if high accuracy is required.
The pH range should be recalibrated:
• Whenever the pH electrode is replaced.
• At least once a week.
• After testing aggressive chemicals.
• When calibration alarm time out is expired ‑ “CAL DUE” blinks (if feature is enabled in
SETUP).
• If “Outside Cal Range” message blinks during pH measurement (the measurement range is
not covered by current calibration, if feature is enabled in SETUP).
PROCEDURE
HI98190 and HI98191 instruments offers a choice of seven standard buffers (pH 1.68, 4.01, 6.86,
7.01, 9.18, 10.01 and 12.45). The meters allow the user to set up to five custom buffers. The set
custom buffers are the buffer values at 25 °C.
When a custom buffer is selected during calibration, the Custom functional key is displayed on the
LCD. Press Custom key in order to enter custom buffer changing mode. Use / keys to change
the value in a ±1.00 pH window, in according with the temperature reading and then Accept. Press
ESC to leave custom buffers value unchanged.
For accurate pH measurements, it is recommended to perform a calibration in maximum allowed
points. However, at least a two point calibration is suggested.
The instrument will automatically skip the buffers used during calibration and the buffers which are
in a ±0.2 pH window around one of the calibrated buffers.
• Pour small quantities of selected buffer solutions into clean beakers. For accurate calibration use
two beakers for each buffer solution, the first one for rinsing 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.
FIVE POINT CALIBRATION
• Immerse the pH electrode approximately 4 cm (1½”) into a buffer solution of
your choice (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45 or a custom buffer)
and stir gently. The temperature probe (HI98191 only) should be close to the
pH electrode.
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pH CALIBRATION
• Press CAL. The instrument will display the measured pH, the LCD first expected buffer and the
temperature reading.
• If necessary, press the / keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected buffer, CFM functional key is
displayed.
• Press CFM to confirm first point.
• The calibrated value and the second expected buffer value is then displayed on the LCD.
• After the first calibration point is confirmed, immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into the second buffer solution and stir gently. The tempera‑
ture probe should be close to the pH electrode.
• If necessary, press the / keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected buffer, the CFM functional key is
displayed.
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pH CALIBRATION
• Press CFM to confirm calibration.
• The calibrated value and the third expected buffer value will be displayed.
• After the second calibration point is confirmed, immerse the pH electrode and the temperature
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 / keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected buffer, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The calibrated value and the fourth expected value will be displayed.
• After the third calibration point is confirmed, immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into the fourth buffer solution and stir gently. The temperature
probe should be close to the pH electrode.
• If necessary, press the / keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
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pH CALIBRATION
• When the reading is stable and within range of the selected buffer, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The calibrated value and the fifth expected buffer will be displayed.
• After the fourth calibration point is confirmed, immerse the pH electrode and the temperature
probe approximately 4 cm (1½”) into the fifth buffer solution and stir gently.
The temperature probe should be close to the pH electrode.
• If necessary, press the / keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected buffer, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The instrument stores the calibration values and returns to normal measurement mode.
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FOUR, THREE or TWO POINT CALIBRATION
• Proceed as described in “FIVE POINT CALIBRATION” section.
• Press CAL or ESC after the appropriate accepted calibration point. The instruments will return to
measurement mode and will memorize the calibration data.
ONE POINT CALIBRATION
Two SETUP selectable options are available for one point calibration: Replace and Offset.
If the Replace option is selected, the slopes between current buffer and nearest lower and higher
buffers will be reevaluated.
If the “Offset” option is selected, an electrode offset correction is performed keeping unchanged
the existing slopes.
• Proceed as described in “FIVE POINT CALIBRATION” section.
• Press CAL or ESC after the first calibration point was confirmed. The instruments will
memorize the one point calibration data and will return to measurement mode.
Notes: Press MTC or MODE key to toggle between pH buffer selection and the temperature
reading during calibration while temperature probe is not connected (MTC mode).
The displayed arrow is moving to the temperature value. Use / keys in order to
change the temperature.
ERROR SCREENS
Wrong buffer
The calibration cannot be confirmed.
The pH reading is not within range of the selected buffer. Select another buffer using the / keys
or change the buffer.
pH CALIBRATION
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pH CALIBRATION
Electrode Dirty/Broken alternatively with Buffer Contaminated
The calibration cannot be confirmed.
The offset of the electrode is not in the accepted range. Check if the electrode is broken or clean it
following the Cleaning Procedure (see page 57). Check the quality of the buffer. If necessary, change
the buffer.
Wrong slope
The calibration cannot be confirmed.
The evaluated slope is less than the lowest accepted value (80% of default slope).
The evaluated slope is more than the highest accepted value (110 % of default slope).
Wrong old slope
An inconsistency between new and previous (old) calibration is detected. Clear old calibration
parameters and proceed with the calibration from the current point. The instrument will keep all
confirmed values during current calibration.
Note: For one point calibration the electrode condition is not displayed in the measurement
screen. Each time a buffer is confirmed, the new calibration parameters replace the old
calibration parameters of the corresponding buffer.
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pH CALIBRATION
If the current confirmed buffer has no correspondence in the existing stored calibration and this is
not full, the current buffer is added to the existing stored calibration.
If the existing stored calibration is full (five calibration points), after confirming the calibration point,
the instrument will ask which buffer will be replaced by current buffer.
Press / keys to select another buffer to be replaced.
Press CFM to confirm the buffer that will be replaced.
Press CAL or ESC to leave replace mode. In this case, the buffer will not be memorized.
Note: The replaced buffer is not removed from calibration list and it can be selected for the
next calibration points.
WORKING WITH CUSTOM BUFFERS
If at least one custom buffer was set in SETUP menu, it can be selected for calibration by pressing
the / keys. The Custom functional key will be displayed.
Press Custom if you want to adjust the buffer value according with current temperature.
Use the / keys to change the buffer value.
Press Accept to accept new value or ESC to exit changing mode.
Note: Custom buffer value can be adjusted in a ±1.00 pH window, around the set value.
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pH CALIBRATION
WORKING WITH MILI pH BUFFERS
If calibration is invoked from mili pH range, the calibration buffer can be modified in a ±0.020 pH
range in according with the label on the calibration buffer.
Press Change to enter buffer adjust mode.
Use / keys to change the buffer value.
Press Accept to accept new value or ESC to exit adjusting mode.
CLEAR CALIBRATION
Press Clear functional key when displayed to clear old calibrations.
All old calibrations, are cleared and the instrument continues calibration. The points confirmed in
current calibration are kept.
Note: If Clear calibration is invoked during the first calibration point, the instrument returns
to measurement mode.
ELECTRODE CONDITION
The display is provided with an icon, and a numeric value (unless the feature is disabled) which gives
an indication of the electrode status after calibration.
The “condition” remains active until the end of the calibration day.
Note: The electrode condition is evaluated only if current calibration includes at least two
standard buffers.
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pH CALIBRATION
CLEAN ELECTRODE WARNING
Each time pH calibration is performed, the instrument internally compares the new calibration with
the one previously stored.
When this comparison indicates a significant difference, the “Clean Electrode” warning message is
displayed to advise the user that the pH electrode may need to be cleaned (see ELECTRODE
CONDITIONING AND MAINTENANCE section for details, page 56).
After cleaning, perform a new calibration.
Note: If the calibration data are cleared, the comparison is done with the default values.
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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.
TEMP pH BUFFERS
°C °F 1.68 4.01 6.86 7.01 9.18 10.01 12.45
0 32 1.67 4.01 6.98 7.13 9.46 10.32 10.38
5 41 1.67 4.00 6.95 7.10 9.39 10.25 13.18
10 50 1.67 4.00 6.92 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 6.86 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
During calibration the instrument will display the pH buffer value at 25 °C.
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RELATIVE mV CALIBRATION
• Press CAL when the instrument is in RELATIVE mV measurement mode. The relative mV value
and the temperature values are displayed.
• Use the / keys if you want to change the displayed relative mV value.
• When the reading is stable, in mV range and the Relative mV offset is inside the offset window
(±2000 mV), CFM functional key is displayed.
• Press CFM to confirm relative mV calibration. The instrument will return to measurement mode.
• If the absolute mV reading is out of range or the Relative mV offset is out of the offset window,
“Wrong relative offset” message is displayed.
Change the input value or the Relative mV value to complete the calibration process.
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ISE CALIBRATION HI98191
It is recommended to calibrate the instrument frequently, especially if high accuracy is required.
The ISE range should be recalibrated:
• Whenever the ISE probe or ion charge is changed.
• At least once a week.
• After testing aggressive chemicals.
• When calibration alarm time out is expired‑ “CAL DUE” tags blinks (if feature is enabled).
Due to electrode conditioning time, the electrode must be kept immersed a few seconds to stabilize.
The user will be guided step by step during calibration with easy to follow tags on the LCD. This will
make the calibration a simple and error‑free procedure.
PROCEDURE
Select the proper ISE probe in SETUP menu or select the proper Ion Charge (see SETUP for details,
page 31).
Note: If ISE probe is not calibrated in at least one point, the “----” will be displayed.
Pour small volumetrically measured 50 mL of calibration standard solutions and transfer into clean
beakers. If possible, use plastic beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross‑contamination, use two beakers for each standard
solution. One for rinsing the electrode and one for calibration.
The instrument offers a choice of six memorized standard solutions: 0.1, 1, 10, 100, 1000,
10000 ppm and calibration up to five points. For fluoride electrode the 2 ppm standard is also
available.
Remove the protective cap from the ISE electrode.
FIVE POINT CALIBRATION
• Immerse the ISE electrode approximately 4 cm (1½") into the less concentrated
standard solution and stir gently.
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ISE CALIBRATION HI98191
• Press CAL. The primary LCD will displays the ion concentration in the selected unit or “‑‑‑” if not
calibrated and first standard value.
• If necessary, press the / keys to select a different standard value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The calibrated value and the second expected standard value will be displayed.
• After the first calibration point is confirmed, immerse the ISE electrode approximately
4 cm (1½”) into the second calibration solution.
• If necessary, press the / keys to select a different standard value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The calibrated value and the third expected standard value will be displayed.
• After the second calibration point is confirmed, immerse the ISE electrode approximately
4 cm (1½”) into the third calibration solution.
• If necessary, press the / keys to select a different standard value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
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27
ISE CALIBRATION HI98191
• The calibrated value and the fourth expected standard value will be displayed.
• After the third calibration point is confirmed, immerse the ISE electrode approximately
4 cm (1½”) into the fourth calibration solution.
• If necessary, press the / keys to select a different standard value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
• Press CFM to confirm calibration.
• The calibrated value and the fifth expected standard value will be displayed.
• After the fourth calibration point is confirmed, immerse the ISE electrode approximately
4 cm (1½”) into the fifth calibration solution.
• If necessary, press the / keys to select a different standard value.
• The “ ” tag will blink on the LCD until the reading is stable.
• When the reading is stable and within range of the selected standard, the CFM functional key is
displayed.
• Press CFM to confirm calibration. The instrument stores the calibration value and returns to
normal measurement mode.
Note: The instrument will automatically skip the standard solutions used during calibration
FOUR, THREE, TWO or ONE POINT CALIBRATION
• Proceed as described in “FIVE POINT CALIBRATION” section.
• Press ESC or CAL key after the appropriate accepted calibration point. The instruments will
return to measurement mode and will memorize the calibration data.
ERROR SCREENS
Wrong standard
The calibration cannot be confirmed.
The message appears if mV input is out of ±2000 mV range.
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28
Wrong slope
The calibration cannot be confirmed.
This message is displayed if slope is out of the accepted range.
Slope under accepted value (30 % default slope).
Slope over accepted value (130 % default slope).
Wrong old slope
An inconsistency between new and previous (old) calibration is detected. Clear old calibration
parameters and proceed calibration from the current point. The instrument will keep all confirmed
values during current calibration.
The instrument will display “‑‑‑‑” on the primary LCD if is not calibrated or after all calibrations are
cleared.
If “Clear” is pressed during the first calibration point, the instrument returns to measurement
mode.
Notes: Press T functional key or MODE to select temperature value to be changed if the
temperature probe is not connected.
ISE range is not temperature compensated.
ISE CALIBRATION HI98191
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GOOD LABORATORY PRACTICE (GLP)
GLP is a set of functions that allows storage and retrieval of data regarding the maintenance and
status of the electrode.
All data regarding pH, Rel mV or ISE calibration is stored for the user to review when necessary.
EXPIRED CALIBRATION
The instrument is provided with a real time clock (RTC), in order to monitor the time elapsed since
the last pH calibration.
The real time clock is reset every time the instrument is calibrated and the “Expired Calibration”
status is triggered when the instrument detects a calibration time out. The “CAL DUE” tags will
start blinking to warn the user that the instrument should be recalibrated.
The calibration time out can be set (see SETUP for details, page 31) from 1 to 7 days or can be
disabled.
For example, if a 4 days time out has been selected, the instrument will issue the alarm exactly
4 days after the last calibration.
However, if at any moment the expiration value is changed (e.g. to 5 days), then the alarm will be
immediately recalculated and appear 5 days after the last calibration.
Notes: When the instrument is not calibrated or calibration is cleared (default values
loaded) there is no “Expired Calibration”, and the display always shows the “CAL DUE”
tags blinking.
When an abnormal condition in the RTC is detected, the instrument forces the “Expired
Calibration” status.
LAST pH CALIBRATION DATA
The last pH calibration data is stored automatically after a successful calibration.
To view the pH calibration data, press GLP when the instrument is in the pH measurement mode.
The instrument will display a lot of data including calibration buffer, offset, slope, electrode
condition.
Note: Buffers displayed in video inverse mode are from previous calibrations. The custom
buffers are marked with an “*” on the right side of the buffer value. “No user calibration”
message is displayed if all calibration are cleared or the instrument was not calibrated in
the pH range.
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30
LAST RELATIVE mV CALIBRATION DATA
Last Relative mV calibration data is stored automatically after a successful calibration.
To view the Relative mV calibration data, press GLP key while in Relative mV measurement mode.
The instrument will display the Relative mV GLP information: calibration date, time and offset.
LAST ISE CALIBRATION DATA
Last ISE calibration data is stored automatically after a successful calibration.
To view the ISE calibration data, press GLP while in ISE measurement mode.
The instrument will display the ISE calibration information: calibration date, time, slope, calibration
status and electrode type.
Notes: Press GLP or ESC at any moment and the instrument will return to measurement
mode.
If calibration has not been performed, the instrument displays “No user calibration”
message.
The calibration standards from previous calibration are displayed in video inverse mode.
GOOD LABORATORY PRACTICE (GLP)
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31
SETUP
Setup mode allows viewing and modifying the measurement parameters.
These are general SETUP parameters for all the ranges and range specific parameters.
The following table lists the general SETUP parameters, their valid range and the factory default
settings.
Description Valid value Default
Backlight Backlight level 0 to 7 4
Contrast Contrast level 0 to 20 10
Auto light off Time until backlight is ON 1, 5, 10, 30 min 1
Auto power off Time after the instrument is
powered OFF
Disabled
5, 10, 30, 60 min
30
Date/Time 01.01.2006 to 12.31.2099
00:00 to 23:59
current
date/time
Time Format AM/PM or 24 hours 24 hours
Date Format DD/MM/YYYY
MM/DD/YYYY
YYYY/MM/DD
YYYY‑MM‑DD
Mon DD, YYYY
DD‑Mon‑YYYY
YYYY‑Mon‑DD
YYYY/MM/DD
Language Message display language Up to four languages English
Temperature unit °C or °F °C
Beep ON Beeper Status Enabled or Disabled Disabled
Instrument ID Instrument identification 0000 to 9999 0000
Baud RAte Serial Communication 600, 1200, 2400, 4800,
9600
9600
Meter information Displays general information
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32
SETUP
The following table lists the specific range parameters.
Item Description Valid value Default
Calibration Timeout
(pH & ISE)
Number of days after
Calibration warning is
displayed
Disable, 1 to 7 days Disable
First point mode (pH) Management of
1 point calibration
Replace or offset Replace
Custom buffer (pH) Custom buffer setting Max. 5 buffers No
View calibration
points (pH)
Display calibration
points
Enable or disabled Enable
Display out of Cal.
Range Warning
Enable or disabled Enable
ISE probe
(HI98191 only)
Type of ISE probe Custom or Standard (17) Fluoride
ISE unit
(HI98191 only)
User, ppt, g/L, ppm, mg/L,
ppb, µg/L, mg/mL, M,
mol/L, mmol/L, % W/V
ppm
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SETUP
GENERAL PARAMETER SCREENS
Backlight
Highlight Backlight.
Press Modify.
Use / keys to change the intensity then press Accept to confirm.
Press ESC to leave without changing.
Contrast
Highlight Contrast.
Press Modify.
Use / keys to change contrast then press Accept to confirm.
Press ESC to leave without changing.
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SETUP
Auto Light Off
Highlight Auto Light Off.
Press 5, 10 or 30 to change settings.
Auto Power Off
Highlight Auto Power Off.
Press Modify.
Press / keys to select interval then press Accept.
Press ESC to leave without changing.
Date/Time
Highlight Date/Time.
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SETUP
Press Modify.
Use / keys to select item.
Use / keys to change focused values.
Press Accept to confirm new setting, or ESC to leave without changing.
Time Format
Highlight Time Format.
Press displayed functional key to change the option.
Date Format
Highlight Date Format.
Press Modify.
Use / keys to select date format then press Accept.
Press ESC to leave without changing.
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36
SETUP
Language
Highlight Language.
Use the desired functional key to change the option. Wait until new language is loaded. If language
load fails the instrument will try to reload current language.
If any language can’t be loaded, the instrument will work in safe mode. In this mode all messages are
displayed in English and Help is not available.
Temperature Unit
Highlight Temperature Unit.
Press the displayed functional key in order to change the temperature unit.
Beep On
Highlight Beep On.
Press the displayed functional key to enable/disable beep.
When enabled, beep sounds as a short beep every time a key is pressed or when the calibration can
be confirmed.
A long beep alert that the pressed key is not active or a wrong condition is detected while in
calibration.
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37
SETUP
Instrument ID
Highlight Instrument ID.
Press Modify.
Use / keys to change the instrument ID.
Press Accept to confirm or ESC to exit without saving.
Baud Rate
Highlight Baud Rate.
Press Modify.
Use / keys to select the desired communication baud.
Press Accept to confirm or ESC to exit.
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SETUP
Meter information
Highlight Meter Information.
Press Select.
The meter informations are displayed:
‑firmware version
‑language version
‑mV and temperature factory calibration time/date
‑battery capacity
RANGE SPECIFIC PARAMETERS SCREENS
Calibration Timeout
Highlight Calibration Timeout.
Press Modify.
Use / keys to set desired value.
Press Accept to confirm or ESC to return without saving.
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SETUP
Note: If enabled “CAL DUE” warning will be displayed, the set number of days after
calibration is over passed.
First Point Mode
Highlight First Point Mode.
Press the displayed functional key in order to change the option.
First point mode refers to the behavior of the instrument regarding “One point calibration”.
If Offset is set, after one point calibration the instrument evaluate the offset and keep unchanged
the slopes.
Custom Buffers
Highlight Custom Buffers.
Press Modify.
Press Delete to delete focused buffer.
Press Add to add a new buffer to the list (max 5).
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40
SETUP
Press Modify to set custom buffer value.
Use / keys to change the value.
Press Accept to confirm custom buffer value or ESC to exit without saving.
View Calibration Points
Highlight View Calibration Points.
Press the displayed functional key to change option.
If option is enabled the calibration buffers corresponding to the last calibration are displayed in the
pH measurement screen.
Out of Calibration Range Warning
Highlight Out of Cal.Range Warning.
Press the displayed functional key in order to change option.
If enabled, the “Out Cal Range” message will be displayed if the pH reading is not within the
calibration range.
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SETUP
ISE probe
Highlight ISE probe.
Press Custom in order to set the parameters for a custom probe.
Press Standard in order to select one probe from the standard probes list.
If Custom is pressed:
Use / keys to highlight the parameter to be changed (“Change Slope” or “Molar Weight”).
Highlight Change Slope.
Use / keys in order to select the desired combination.
If None/-59.16 is selected the slope of the probe can be changed by pressing Modify key.
Press Modify.
Use / keys to change the slope.
Press Accept to confirm or ESC to exit.
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SETUP
Highlight Molar Weight.
Press Modify in order to change molar weight.
Use / keys to change the value. Press Accept to confirm or ESC to exit.
If Standard was pressed.
Use / keys to highlight the desired electrode.
Press Accept to confirm setting or ESC to exit.
Press View to see probe parameters.
ISE Unit
Highlight ISE Unit.
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SETUP
Press Modify.
Use / key to select unit.
Press Accept to confirm selection or ESC to exit.
Note:If the unit is changed or “User” is selected a warning message will be displayed to
alert that the ISE range must be calibrated.
If a new probe was selected or custom probe parameter are changed, the ISE range must
be calibrated.
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44
LOGGING
This feature allows the user to log pH, Rel mV or ISE measurements. All logged data can be
transferred to a PC through the USB port using HI92000 application.
The maximum logging space is 300 for HI98191 and 200 for HI98190 record locations (100
records on each range).
LOGGING THE CURRENT DATA
To store the current reading into memory, press LOG while in measurement mode.
The instrument will display for few seconds the record number and the amount of the free log
space.
If the LOG space is full, the “Log space is full” message will be displayed for few seconds when
Log key is invoked. Enter View Logged Data Mode and delete records in order to free log space.
VIEW LOGGED DATA
Press RCL to retrieve the information stored while in measurement mode for the specific range.
The list of records is displayed.
If no data were logged, the instrument will display “No Records” message.
Use / keys to scroll between the records from the list.
Press Delete All to enter Delete All screen.
Press Delete to enter Delete records screen.
Press More to view more information of the focused record.
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45
LOGGING
If More is pressed.
Use / keys to scroll between complete log information.
If Delete is pressed.
Use / key to focus the record to be deleted and then press CFM.
Press ESC to exit.
If Delete All is pressed the instrument asks for confirmation.
Press CFM to confirm or ESC to exit without deleting.
To freeze the first stable reading on the LCD press AutoEnd while the instrument is in measurement
mode.
The ”Wait” symbol will blink until the reading is stable.
When the reading is stable, “Hold” icon will be displayed.
Press Continue in order to enter continuous reading mode.
AUTOEND
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mV AND TEMPERATURE CALIBRATION (for technical personnel only)
All the instruments are factory calibrated for mV and temperature.
Hanna’s temperature probes are interchangeable and no temperature calibration is needed when
they are replaced.
If the temperature or ORP measurements are inaccurate, calibration should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna Customer Service Center, or
follow the instructions below.
ENTER CALIBRATION MODE
With the instrument off, press and hold down the / then power on the instrument. The calibra‑
tion screen is displayed. Press “T” functional key to enter the temperature calibration mode.
TEMPERATURE CALIBRATION
• Prepare a vessel containing ice and water and another one containing hot waterm (at
approximately 50 °C or 122 °F). Place insulation material around the vessels to minimize tem‑
perature changes.
• Use a calibrated thermometer with a resolution of 0.1 °C as a reference thermometer. Connect the
temperature probe to the appropriate socket.
• Immerse the temperature probe or the pH probe including temperature sensor into the vessel
with ice and water as close as possible to the reference thermometer. Allow a few seconds for
the probe to stabilize.
• Use the / keys to set the calibration point value to that of ice and water mixture, measured
by the reference thermometer. When the reading is stable and within range of the selected
calibration point, the CFM functional key is displayed.
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47
mV AND TEMPERATURE CALIBRATION (for technical personnel only)
• Press CFM to confirm.
• The second expected calibrated point is displayed.
• Immerse the temperature probe into the second vessel as close as possible to the reference
thermometer. Allow a few seconds for the probe to stabilize.
• Use the / keys to set the calibration point value to that of the hot water.
• When the reading is stable and within range of the selected calibration point, CFM functional key
is displayed.
• Press CFM to confirm. The instrument returns to measurement mode.
Note: Use / keys to change calibration point if necessary (±10.0 °C) around the
point. If the reading is not within range of the selected calibration point, “Wrong”
message will blink. Change the temperature probe and restart calibration.
mV CALIBRATION
A two point calibration can be performed at 0 mV and 1800 mV.
• Attach to the BNC connector a mV simulator with an accuracy of ±0.1 mV.
• Enter the calibration screen. Press mV functional key.
• Set 0.0 mV on the simulator.
• When the reading is stable and within range of the selected calibration point, the CFM
functional key is displayed.
• Press CFM to confirm. The second calibration point of 1800 mV will be displayed.
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48
mV AND TEMPERATURE CALIBRATION (for technical personnel only)
• Set 1800.0 mV on the simulator.
• When the reading is stable and within range of the selected calibration point, the CFM functional
key is displayed.
• Press CFM to confirm. The instrument returns to calibration screen.
• Press ESC to return to measurement mode.
Notes: If the reading is not within range of the selected calibration point, “WRONG” tag will
blink. Verify calibration condition or contact your vendor if you cannot calibrate.
Press CAL or ESC in any moment of the calibration process. The instrument will return in
the measurement mode.
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49
PC INTERFACE
Data transmission from the instrument to the PC can be done with the HI92000 Windows®
compatible software (optional). HI92000 also offers graphing and on‑line help feature.
Data can be exported to the most popular spreadsheet programs for further analysis.
To connect your instrument to a PC, use an USB cable connector. Make sure that your instrument is
switched off and plug one connector to the instrument USB socket and the other to the serial or USB
port of your PC.
Note: If you are not using Hanna Instruments HI92000 software, please see the following
instructions.
SENDING COMMANDS FROM PC
It is also possible to remotely control the instrument with any terminal program. Use an USB cable
to connect the instrument to a PC, start the terminal program and set the communication options as
follows: 8, N, 1, no flow control.
COMMAND TYPES
To send a command to the instrument follow the next scheme:
<command prefix> <command> <CR>
where: <command prefix> is the 16 ASCII character
<command> is the command code.
Note: Either small or capital letters can be used.
SIMPLE COMMANDS
KF1 Is equivalent to pressing functional key 1
KF2 Is equivalent to pressing functional key 2
KF3 Is equivalent to pressing functional key 3
RNG Is equivalent to pressing RANGE key
MOD Is equivalent to pressing MODE key
CAL Is equivalent to pressing CAL key
UPC Is equivalent to pressing the UP arrow key
DWC Is equivalent to pressing the DOWN arrow key
RCL Is equivalent to pressing RCL key
SET Is equivalent to pressing SETUP key
CLR Is equivalent to pressing CLR key
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PC INTERFACE
OFF Is equivalent to pressing OFF key
CHR xx Change the instrument range according with the parameter value (xx):
• xx=00 pH range/0.001 resolution
• xx=01 pH range/0.01 resolution
• xx=02 pH range/0.1 resolution
• xx=03 mV range
• xx=04 Relative mV range
• xx=05 ISE range (HI98191)
The instrument will answer for these commands with:
<STX> <answer> <ETX>
where: <STX> is 02 ASCII code character (start of text)
<ETX> is 03 ASCII code character (end of text)
<answer>:
<ACK> is 06 ASCII code character (recognized command)
<NAK> is 21 ASCII code character (unrecognized command)
<CAN> is 24 ASCII code character (corrupted command)
COMMANDS REQUIRING AN ANSWER
The instrument will answer for these commands with:
<STX> <answer> <checksum> <ETX>
where the checksum is the bytes sum of the answer string sent as 2 ASCII characters.
All the answer messages are with ASCII characters.
RAS Causes the instrument to send a complete set of readings in according with the current
range:
• pH, temperature and mV reading on pH range.
• Rel mV, absolute mV and temperature reading on Rel mV range.
• concentration, mV and temperature reading on ppm range (HI98191).
The answer string contains:
• Meter mode (2 chars):
• 00 ‑ pH range (0.001 resolution)
• 01 ‑ pH range (0.01 resolution)
• 02 ‑ pH range (0.1 resolution)
• 03 ‑ mV range
• 04 ‑ Rel mV range
• 05 ‑ ISE range
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51
PC INTERFACE
• Meter status (2 chars of status byte): represents a 8 bit hexadecimal encoding.
• 0x10 ‑ temperature probe is connected
• 0x01 ‑ new GLP data available
• 0x02 ‑ new SETUP parameter
• 0x04 ‑ out of calibration range
• 0x08 ‑ the meter is in autoend point mode
• Reading status (2 chars): R ‑ in range, O ‑ over range, U ‑ under range. First
character corresponds to the primary reading. Second character corresponds to
mV reading.
• Primary reading (corresponding to the selected range) ‑ 11 ASCII chars, includ‑
ing sign and decimal point and exponent.
• Secondary reading (only when primary reading is not mV) ‑ 7 ASCII chars,
including sign and decimal point.
• Temperature reading ‑ 7 ASCII chars, with sign and two decimal points, always
in °C.
MDR Requests the instrument model name and firmware code (16 ASCII chars).
GLP Requests the calibration data record.
The answer string contains:
• GLP status (1 char): represents a 4 bit hexadecimal encoding.
• 0x01 ‑ pH calibration available
• 0x02 ‑ Rel mV calibration available
• 0x04 ‑ ISE calibration available
• pH calibration data (if available), which contains:
• the number of calibrated buffers (1 char)
• the ion charge, with sign (2 chars)
• the offset, with sign and decimal point (7 chars)
• the average of slopes, with sign and decimal point (7 chars)
• the calibration time, yymmddhhmmss (12 chars)
• buffers information (for each buffer)
• type (1 char): 0 ‑ standard, 1 ‑ custom
• status (1 char): N (new) ‑ calibrated in last calibration; O (old) ‑ from
an old calibration.
• warnings during calibration (2 chars): 00 ‑ no warning, 04 ‑ Clean
Electrode warning.
• buffer value, with sign and decimal point and exponent (11 chars).
• calibration time, yymmddhhmmss (12 chars).
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52
• electrode condition, with sign (3 chars). The “‑01” code means not calculated.
• Rel mV calibration data (if available), which contains:
• the calibration offset, with sign (7 chars)
• the calibration time, yymmddhhmmss (12 chars).
• ISE calibration data (if available), which contains:
• the number of calibrated standards (1 char)
• the ion charge, with sign (2 chars)
• the calibration slope, with sign and decimal point (7 chars)
• the calibration time, yymmddhhmmss (12 chars)
• standards information (for each standard)
• type (1 char): 0 ‑ always standard solution.
• status (1 char): N (new) ‑ calibrated in last calibration;
O (old) ‑ from an old calibration.
• warnings during calibration (2 chars): 00 ‑ no warning.
• standard value, with sign and decimal point and exponent
(11 chars).
• calibration time, yymmddhhmmss (12 chars).
PAR Requests the setup parameters setting.
The answer string contains:
• Instrument ID (4 chars)
• Calibration Alarm time out for pH (2 chars)
• Calibration Alarm timeout for ISE (2 chars) ‑ if ISE available
• SETUP information (2 chars): 8 bit hexadecimal encoding.
• 0x01 ‑ beep ON (else OFF)
• 0x04 ‑ degrees Celsius (else degrees Fahrenheit)
• 0x08 ‑ Offset calibration (else Point calibration)
• Auto Light Off time (3 chars)
• Auto Power Off time (3 chars)
• The number of custom buffers (1 char)
• The custom buffer values, with sign and decimal point, for each defined custom
buffer (7 chars)
• The ID of the ISE electrode (2 chars) ‑ if ISE available
• The molar weight of the selected ION, with sign and decimal point
(9 ASCII characters)
• The ion charge (2 chars)
• The ISE unit (2 chars)
PC INTERFACE
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53
• The short name of the selected language (3 chars)
NSLx Requests the number of logged samples (4 chars).
The command parameter (1 char):
• P ‑ request for pH range
• M ‑ request for mV and Rel mV ranges
• I ‑ request for ISE range
LODPxxx Requests the xxxth pH record logged data.
LODMxxx Requests the xxxth mV/Rel mV record logged data.
LODIxxx Requests the xxxth ISE record logged data (HI98191).
LODPALL Requests all pH Log on demand.
LODMALL Requests all mV/Rel mV Log on demand.
LODIALL Requests all ISE Log on demand (HI98191).
The answer string for each record contains:
• The logged mode (2 chars):
• 00 ‑ pH range (0.001 resolution)
• 01 ‑ pH range (0.01 resolution)
• 02 ‑ pH range (0.1 resolution)
• 03 ‑ mV range
• 04 ‑ Rel mV range
• 05 ‑ ISE range
• Reading status (1 char): R, O, U
• Calculated reading, with sign and decimal point and exponent
(11 chars) ‑ for pH, Rel mV and ISE range
• Temperature reading, with sign and two decimal points (7 chars)
• mV reading status (1 char): R, O, U
• The mV reading, with sign and decimal point (7 chars)
• The logged time, yymmddhhmmss (12 chars)
• The calibration slope, with sign and decimal point (7 chars) ‑ not available
for Rel mV range
• The calibration offset, with sign and decimal point (7 chars) ‑ not available
for ISE
• Temperature probe presence (1 char)
PC INTERFACE
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54
Notes: “Err8” is sent if the instrument is not in measurement mode.
“Err6” is sent if the requested range is not available.
“Err4” is sent if the requested set parameter is not available.
“Err3” is sent if the Log on demand is empty.
“Err9” is sent if the battery power is less than 30%.
Invalid commands will be ignored.
To replace the batteries, follow the next steps:
• Turn OFF the instrument.
• Open the battery compartment by removing the four screws from the back of the instrument.
• Remove the old batteries.
• Insert four new 1.5V AA batteries in the battery compartment while paying attention to the correct
polarity.
• Close the battery compartment using the four screws.
If the battery capacity is less than 20 % the serial communication and the backlight feature are not
available.
BATTERIES REPLACEMENT
Note: The instrument is provided with the BEPS (Battery Error Prevention System) feature,
which automatically turns the instrument off when the batteries level is too low to ensure
reliable readings.
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55
The resistance of glass electrodes partially depends on the temperature. The lower the temperature,
the higher the resistance. It takes more time for the reading to stabilize if the resistance is higher. In
addition, the response time will suffer to a greater degree at temperatures below 25 °C (77 °F).
Since the resistance of the pH electrode is in the range of 50 – 200 MΩ, the current across the
membrane is in the pico Ampere range. Large currents can disturb the calibration of the electrode for
many hours.
For these reasons high humidity environments, short circuits and static discharges are detrimental to
a stable pH reading.
The pH electrode’s life also depends on the temperature. If constantly used at high temperatures, the
electrode life is drastically reduced.
Typical Electrode Life
Ambient Temperature 1 – 3 years
90 °C (194 °F) Less than 4 months
120 °C (248 °F) Less than 1 month
Alkaline Error
High concentrations of sodium ions interfere with readings in alkaline solutions. The pH at which the
interference starts to be significant depends upon the composition of the glass. This interference is
called alkaline error and causes the pH to be underestimated. Hanna’s glass formulations have the
indicated characteristics.
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS
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56
ELECTRODE CONDITIONING AND MAINTENANCE
PREPARATION PROCEDURE
Remove the electrode protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is normal with electrodes and they
will disappear when rinsed with water.
During transport tiny bubbles of air may have formed inside the glass bulb. The electrode cannot
function properly under these conditions. These bubbles can be removed by "shaking down" the
electrode as you would do with a glass thermometer.
If the bulb and/or junction are dry, soak the electrode in HI70300 Storage Solution for at least one
hour.
For refillable electrodes:
If the filling solution (electrolyte) is more than 21/2 cm (1”) below the fill hole, add HI7082 or
HI8082 3.5M KCl Electrolyte Solution for double junction or HI7071 or HI8071 3.5M KCl+AgCl
Electrolyte Solution for single junction electrodes.
*Not present in gel electrodes.
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57
ELECTRODE CONDITIONING AND MAINTENANCE
For faster response, unscrew the fill hole screw during measurements.
For AmpHel® electrodes:
If the electrode does not respond to pH changes, the battery run down and the electrode should be
replaced.
MEASUREMENT
Rinse the pH electrode tip with distilled water. Immerse the tip (bottom 4 cm /1½” ensuring the
reference junction is submerged) in the sample and stir gently for a few seconds.
For a faster response and to avoid cross‑contamination of the samples, rinse the electrode tip with a
few drops of the solution to be tested, before taking measurements.
See that the sleeve holes of the ORP probe are completely submerged.
STORAGE PROCEDURE
To minimize clogging and assure a quick response time, the glass bulb and the junction of pH
electrode should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of HI70300 or HI80300 Storage Solution
or, in its absence, Filling Solution (HI7071 or HI8071 for single junction and HI7082 or HI8082
for double junction electrodes). Follow the Preparation Procedure on page 56 before taking mea‑
surements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to the instrument must be intact
and there must be no points of broken insulation on the cable or cracks on the electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches or cracks are present, replace the elec‑
trode.
Rinse off any salt deposits with water.
pH Probe Maintenance
For refillable electrodes:
Refill the reference chamber with fresh electrolyte (HI7071 or HI8071 for single junction or HI7082
or HI8082 for double junction electrodes). Allow the electrode to stand upright for 1 hour.
Follow the Storage Procedure above.
pH CLEANING PROCEDURE
• General Soak in Hanna HI7061 or HI8061 General Cleaning Solution for approximately
½ hour.
• Protein Soak in Hanna HI7073 or HI8073 Protein Cleaning Solution for 15 minutes.
• Inorganic Soak in Hanna HI7074 Inorganic Cleaning Solution for 15 minutes.
• Oil/grease Rinse with Hanna HI7077 or HI8077 Oil and Fat Cleaning Solution.
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58
IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thoroughly with
distilled water, refill the reference chamber with fresh electrolyte (not necessary for gel‑filled elec‑
trodes) and soak the electrode in HI70300 or HI80300 Storage Solution for at least 1 hour before
taking measurements.
TROUBLESHOOTING GUIDE
SYMPTOMS PROBLEM SOLUTION
Slow response/excessive drift. Dirty pH electrode. Soak the electrode tip in HI7061
solution for 30 minutes and then
follow the Cleaning Procedure.
Reading fluctuates up and down (noise). Clogged/dirty junction. Low
electrolyte level (refillable
electrodes only).
Clean the electrode. Refill with fresh
electrolyte (refillable electrodes
only).
Display shows blinking full scale value. Reading out of range. Check that sample is within measur‑
able range
mV scale out of range. Dry membrane or dry junction. Soak electrode in HI70300 storage
solution for at least 30 minutes.
Display shows symbol in front of
temperature reading.
Out of order or missing tempera‑
ture probe.
Replace temperature probe or check
the connection.
Display shows "Clean electrode"
blinking.
Difference between new and
previous calibration has been
detected.
Clean electrode and recalibrate.
If the problem remains, check the
buffer solutions.
Meter does not work with temperature
probe.
Broken temperature probe. Replace temperature probe.
Meter fails to calibrate or gives faulty
readings.
Broken pH electrode. Replace electrode.
Error messages are displayed during pH
calibration procedure.
Wrong or contaminated buffer,
electrode dirty or broken.
Check that buffer solution is correct
and fresh.
Meter shuts off. Dead accumulators; Auto‑off
feature is enabled: in this case,
meter shuts off after selected
period of non‑use.
Recharge accumulators or replace
batteries; Press ON/OFF.
"Errxx" message at start up. Internal error. Contact your dealer or any Hanna
Service Center.
The instrument does not start when
pressing ON/OFF.
Initialization error. Press and hold down ON/OFF for
about 20 seconds or disconnect and
then connect one accumulator.
Page 59
Hanna Instruments reserves the right to modify the design, construction or appearance of its products
without advance notice.
Recommendations
for Users
Before using Hanna products, make sure that they are entirely suiable
for your specific application and for the environment in which they
are used. Operation of these instruments may cause unacceptable in‑
terferences to other electronic equipment. Take all necessary steps to
correct such interferences.
During operation, ESD wrist straps should be worn to avoid possible
damage to the electrode by electrostatic discharges.
Any variation introduced by the user to the supplied equipment may
degrade the instruments’ EMC performance.
To avoid electrical shock, do not use these instruments when voltages
at the measurement surface exceed 24 Vac or 60 Vdc.
To avoid damage or burns, do not perform any measurement in mi‑
crowave ovens.
The HI98190 and HI98191 are warranted for two years against defects in workman‑
ship and materials when used for their intended purpose and maintained according
to instructions. Electrodes and probes are warranted for six months. This warranty
is limited to repair or replacement free of charge.
Damage due to accidents, misuse, tampering or lack of prescribed maintenance is
not covered.
If service is required, contact the dealer from whom you purchased the instrument.
If under warranty, report the model number, date of purchase, serial number and
the nature of the problem. If the repair is not covered by the warranty, you will be
notified of the charges incurred. If the instrument is to be returned to Hanna Instru‑
ments, first obtain a Returned Goods Authorization (RGA) number from the Technical
Service department and then send it with shipping costs prepaid. When shipping any
instrument, make sure it is properly packed for complete protection.
Warranty
Page 60
Printed in ROMANIA
MAN98191 03/16
World
Headquarters
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
www.hannainst.com
Local Office
Hanna Instruments USA
270 George Washington Highway
Smithfield, RI 02917
Phone: 800.426.6287
Fax: 401.765.7575
e‑mail: tech@hannainst.com
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