Hanna Instruments HI 9124 User manual

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Instruction Manual
www.hannainst.com
HI9124, HI9125
Portable Waterproof
pH Meters

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Dear Customer,
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using these
instruments.
This manual will provide you with the necessary information for correct
use of these instruments, as well as a precise idea of their versatility.
If you need additional technical information, do not hesitate to e‑mail
us at [email protected].
The instruments are in compliance with directives.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.

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PRELIMINARY EXAMINATION .........................................................4
GENERAL DESCRIPTION..................................................................4
LCD MESSAGE GUIDE.....................................................................5
FUNCTIONAL DESCRIPTION.............................................................6
SPECIFICATIONS............................................................................7
OPERATIONAL GUIDE.....................................................................8
pH CALIBRATION .........................................................................11
pH BUFFER TEMPERATURE DEPENDENCE ......................................14
SETUP MENU..............................................................................15
mV CALIBRATION (HI9125 only) ..................................................16
TEMPERATURE CALIBRATION........................................................16
BATTERIES REPLACEMENT............................................................16
TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS.................18
ELECTRODE CONDITIONING & MAINTENANCE.................................19
TROUBLESHOOTING GUIDE ..........................................................21
ACCESSORIES..............................................................................22
TABLE OF CONTENTS

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The HI9124 and HI9125 are state‑of‑the‑art rugged waterproof, hand
held pH meters designed to provide laboratory results and accuracy
under harsh industrial conditions.
A large multi‑level LCD, with clear indications related to the electrode
and instrument status, pH and temperature displayed simultaneously,
and user friendly symbols and text instructions during calibration.
The pH calibration procedure is automatic with 5 auto recognized
buffers (4.01, 6.86, 7.01, 9.18 and 10.01) and automatic temperature
compensation.
The HI9125 can be used with ORP (Oxidation Reduction Potential)
electrodes. mV measurements automatically change from 0.1 to 1 mV
resolution when the reading reaches 700 mV.
Remove the instrument from the packing material and examine it to
make sure that no damage has occurred during shipping. If there is any
damage, please contact your local Hanna Instruments Office.
Each meter is supplied with:
• HI1230B non refillable combination double‑junction pH electrode
with gelled electrolyte.
• HI7662 stainless steel temperature probe with 1 m (3.3’’) cable
• pH4.01 & pH7.01 buffer solutions, 20 mL sachet
• 100 mL plastic beaker
• 1.5V AAA batteries (3 pcs.)
• Instruction manual
• Rugged carrying case
• Quality Certificate
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.
PRELIMINARY EXAMINATION
GENERAL DESCRIPTION

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TAGS & SYMBOLS
• Mode tags lights up for indicating the corresponding active mode,
and blinks for warning the user.
MEASURE on: measurement mode.
SETUP on: SETUP menu mode has been entered.
CALIBRATION on: calibration mode has been entered.
MEMORIZE on: measurement stored in the internal memory and
frozen on the display
RECALL MEMORIZED on: stored value recalled.
• Battery symbol blinking: low battery condition. Batteries should
be replaced.
• Calibration messages.
WAIT NOT READY blinking: buffer has been recognized, but
reading is not stable.
READY on: buffer has been recognized and reading is stable.
WRONG and WRONG blinking alternatively: wrong buffer,
value not recognized.
• Main active key messages light up for indicating the corresponding
active key.
CFM blinking: ask for confirmation of calibration or set value.
MR on: MR key available.
MEM on: MEM key available.
CAL on: CAL key available.
RANGE on: RANGE key available. (HI9125 only)
SETUP on: SETUP key available.
LCD MESSAGE GUIDE

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1) Liquid Crystal Display (LCD).
2) RANGE key, to select pH or mV (HI9125 only).
3) ON/OFF key, to turn the meter ON and OFF.
4) CAL key, to enter or exit calibration mode.
5) SETUP/CFM key, to enter SETUP mode or to confirm calibration.
6) Battery compartment cap.
7) Temperature probe socket.
8) BNC electrode connector.
9) MR key, to recall stored value from memory.
10) MEM key, to store reading in memory.
11) and keys, for manual temperature setting, or selecting
pH buffer value.
12) Secondary display.
13) Primary display.
FUNCTIONAL DESCRIPTION

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RANGE
‑2.00 to 16.00 pH
±699.9 mV / ±1999 mV
(HI9125 only)
‑20.0 to 120.0 °C (‑4.0 to 248.0 °F)
RESOLUTION
0.01 pH
0.1 mV / 1 mV (HI9125 only)
0.1 °C (0.1 °F)
ACCURACY
@ 20 ºC / 68 ºF
±0.01 pH
±0.2 mV / ±1 mV (HI9125 only)
±0.4 °C (±0.8 °F)
(excluding probe error)
Typical EMC Deviation
±0.02 pH
±0.2 mV / ±1 mV
±0.4 °C (±0.8 °F)
pH Calibration
1 or 2‑point,
with 5 memorized buffers
(4.01, 6.86, 7.01, 9.18, 10.01)
Offset Calibration ±1 pH
Slope Calibration From 80 to 108%
Temperature
Compensation
Automatic, from ‑20.0 to 120.0 °C
(‑4.0 to 248.0 °F) or manual,
without temperature probe
pH Electrode HI1230B (included)
Temperature Probe HI7662 (included)
Input Impedance 1012 ohms
Battery Type & Life 3 x 1.5V AAA batteries
approx. 200 hours of continuous use
Auto-off User selectable: 20 minutes or disabled
Dimensions 185x72x36 mm (7.3x2.8x1.4”)
Weight 300 g (10.6 oz.)
Environment 0 – 50 °C (32 – 122 °F)
max RH 100%
Warranty 2 years
SPECIFICATIONS

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OPERATIONAL GUIDE
INITIAL PREPARATION
The instrument is supplied with batteries. In order to place the batteries
inside the instrument follow the instructions from page 16.
To prepare the instrument for use, connect the pH electrode and the
temperature probe to the BNC and temperature sockets on the top of
the instrument. The temperature probe can be used independently
to take temperature measurements, or it can be used in conjunction
with the pH electrode to utilize Automatic Temperature Compensation
(ATC) mode. If the probe is disconnected, temperature can also be set
manually with the ARROW keys.
Turn the instrument ON by pressing ON/OFF.
At start‑up the display will show all the LCD segments and then the
battery percentage while the instrument performs a self check (or as
long as the button is held).
The meter automatically enters measurement mode.
After measurement, switch the meter off. Clean the electrode and store
it with a few drops of HI70300 storage solution in the protective cap.
To save batteries, the auto‑off feature turns the meter off after 20
minutes with no button pressed. To disable this feature, see “Setup
Menu” section on page 15.
pH MEASUREMENTS
Calibrate the meter and pH electrode before taking
measurements. See page 10 for details. To take a
pH measurement remove the electrode’s protec‑
tive cap, rinse off pH sensing tip. Submerse the
electrode and the temperature probe 3 cm (1¼”)
into the sample and stir gently.
If necessary, press the RANGE key until the
display shows pH mode (HI9125 only).
Allow time for the reading to stabilize.

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Notes: When the reading is out of
range, the display will flash the
closest full-scale value.
If using pH electrode while in mV
mode, the meter will measure the
mV generated by the pH electrode.
The LCD will show the pH measurement and the temperature of the
sample.
If several measurements are taken successively in different samples,
rinse the electrode thoroughly with deionized or tap water and a small
amount of the sample to be measured.
The pH value of the sample is directly affected by temperature. In
order for the meter to measure the pH accurately, the value must be
compensated for temperature. If the sample temperature is different
from the temperature at which the pH electrode was kept, allow a few
minutes for thermal equilibrium.
To use the meter’s Automatic Temperature Compensation feature, sub‑
merse the temperature probe into the sample as close to the electrode
as possible and wait for a few minutes.
If manual temperature compensation is desired the temperature
probe must be disconnected from the instrument.
The display will show the default temperature of “25 °C”, or the last
temperature set with the “°C” (or “°F”) indicator blinking.
The temperature can now be adjusted with the ARROW keys. Set the
value at the sample temperature.

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ORP MEASUREMENTS (HI9125 only)
To perform ORP measurements, connect an optional ORP electrode (see
“Accessories” section) to the meter and turn it ON.
If necessary, enter the mV mode by pressing RANGE until the display
changes to mV.
Submerse the ORP electrode 3 cm (1¼”) into the sample to be tested
and wait a few minutes for the reading to stabilize.
Measurements within the ±699.9 mV range are displayed with
0.1 mV resolution, while outside this range the resolution automatically
switches to 1 mV.
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 (see “Accessories” section).
MEM &MR FUNCTIONS
The instrument allows the user to store the current measurement (pH
and temperature, or mV and temperature) into internal memory by
pressing the MEM key. The “MEMORIZE” tag lights up on display.
Stored values can be recalled by pressing MR: the display will show
the values and the “RECALL MEMORIZED” tag as long as the button
is pressed.