Hanna Instruments HI98164 User manual

INSTRUCTION MANUAL
HI98164
Professional
pH & Temperature Meter
for Yogurt Products

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
[email protected] 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 ..............................................................................................
SAFETY MEASURES ...........................................................................................................
GENERAL DESCRIPTION ......................................................................................................
FUNCTIONAL DESCRIPTION ................................................................................................
SPECIFICATIONS ................................................................................................................
OPERATIONAL GUIDE .........................................................................................................
pH CALIBRATION ...............................................................................................................
pH BUFFER TEMPERATURE DEPENDENCE ............................................................................
GOOD LABORATORY PRACTICE (GLP) ...................................................................................
SETUP ..............................................................................................................................
LOGGING ..........................................................................................................................
AUTOEND .........................................................................................................................
TEMPERATURE CALIBRATION (FOR TECHNICAL PERSONNEL ONLY) .........................................
PC INTERFACE ...................................................................................................................
BATTERIES REPLACEMENT ..................................................................................................
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ......................................................
ELECTRODE CONDITIONING AND MAINTENANCE ..................................................................
TROUBLESHOOTING GUIDE ................................................................................................
ACCESSORIES ...................................................................................................................
TABLE OF CONTENTS
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34
38
43
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11
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47
48

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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, please contact your local Hanna
Instruments Office.
Each instrument is supplied with:
•FC2133 glass body, pH probe with internal temperature sensor
•HI700643 Cleaning and disinfection solution for yogurt products (food industry) (2 pcs.)
•HI920015 USB cable
•pH 4.01 & 7.01 Buffer solutions (230 mL each)
•100 mL Beaker (2 pcs.)
•1.5V AA Batteries (4 pcs.)
•HI720161 Hard carrying case
•Instruction Manual and Quick Reference Guide
•Instrument Quality 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.
SAFETY MEASURES
Before using this product, make sure that it is entirely suitable for your specific application and for
the environment in which it is used.
Operation of this instrument may cause interference to other electronic equipment, requiring the
operator to take steps to correct interference. Any variation introduced by the user to the supplied
equipment may degrade the instrument’s EMC performance.
To avoid damages or burns, do not put the instrument in microwave ovens. For your and the
instrument’s safety, do not use or store the instrument in hazardous environments.

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GENERAL DESCRIPTION
Other features include:
• Log on demand up to 200 samples (100 pH and 100 mV).
• Auto Hold feature, to freeze first stable reading on the LCD.
• GLP feature, to view last calibration data for pH.
• PC interface.
The HI98164 is a portable pH and temperature meter designed specifically for pH measurement in
yogurt. Monitoring pH is crucial in producing consistent, quality yogurt. Yogurt is made by fermenta‑
tion of milk with live bacterial cultures. Once milk is pasteurized, live culture is added and the mixture
of milk and bacteria is incubated. Yogurt producers cease incubation once a specific pH level is
reached. By verifying that fermentation continues to a predetermined pH endpoint, yogurt producers
can ensure their products remain consistent in terms of flavor, aroma and texture.
The HI98164 meter is 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.
This meter is supplied with a pH electrode specifically designed for use with yogurt products. The
FC2133 with a built‑in temperature sensor features a rugged easy to clean glass body with a conic
glass tip ideal for measurements in semi‑solids such as yogurt. The open junction design consists of
a solid gel interface (viscolene) between the sample and internal Ag/AgCl reference. This interface
not only prevents silver from entering the sample, but also makes it impermeable to clogging after
measurements in semi‑solid or viscuous samples.
FC2133 electrode is designed to prevent the typical problems of clogging in viscuous liquids, ensuring
a fast response and stable reading.

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1) Liquid Crystal Display (LCD).
2) Functional keys.
3) /keys to scroll through calibration buffers, setup options, manual temperature compensation
and logged data.
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.
11) RANGE key, to switch between pH and mV range.
12) HELP key to enter/exit contextual help.
13) ESC to leave current mode, exit calibration, setup, help. etc.
FRONT VIEW
FUNCTIONAL DESCRIPTION
Yogurt pH Meter

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14) Electrode quick connect DIN connector.
15) USB connector.
TOP VIEW
FUNCTIONAL DESCRIPTION

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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
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)
mV
Range ±2000.0 mV
Resolution 0.1 mV
Accuracy ±0.2 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 Automatic
pH Electrode FC2133 pH & temperature
LOG On demand, 200 samples (100 pH and 100 mV)
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 42.
Make sure that the protective micro USB cover is used when not connected to a computer to ensure
waterproof protection.
For HI98164 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 Instruments 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 45).
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 23.
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 23.
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 to choose between pH and mV ranges.
Use MODE key to select the pH resolution.
Allow time 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).
• 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 order to take more accurate pH measurements, make sure that the instrument is calibrated (see
page 11 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.
On the pH screen are displayed:
TEMPERATURE MEASUREMENTS
For HI98164 the temperature sensor is connected through DIN socket.
Note: The temperature can be displayed in Celsius degrees (°C) or in Fahrenheit degrees
(°F) (see SETUP for details, page 23).
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 23) with no buttons pressed.