Instruction Manual
HI 9126
Calibration Check
Waterproof
pH/mV/ºC Meter
w w w. h a n n a i n s t . c o m
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Dear Customer,
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.
WARRANTY
HI 9126 is guaranteed for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. Electrodes and probes are guaranteed 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 instruments. 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 instruments are to be returned to Hanna Instruments, first obtain a Returned Goods Authorization 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.
TABLE OF CONTENTS
WARRANTY .................................................................................. |
2 |
PRELIMINARY EXAMINATION ......................................................... |
3 |
GENERAL DESCRIPTION ................................................................. |
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FUNCTIONAL DESCRIPTION ........................................................... |
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SPECIFICATIONS ........................................................................... |
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OPERATIONAL GUIDE .................................................................... |
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pH CALIBRATION ....................................................................... |
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pH BUFFER TEMPERATURE DEPENDENCE ....................................... |
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SETUP MENU ............................................................................. |
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mV CALIBRATION ....................................................................... |
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TEMPERATURE CALIBRATION ....................................................... |
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BATTERIES REPLACEMENT ............................................................ |
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LCD MESSAGE GUIDE .................................................................. |
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TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ................ |
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ELECTRODE CONDITIONING & MAINTENANCE ................................ |
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TROUBLESHOOTING GUIDE ......................................................... |
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ACCESSORIES ............................................................................. |
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PRELIMINAR Y EXAMINATION
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, notify your dealer or the nearest Hanna Customer Service Center.
Each meter is supplied with:
•HI 1230B combination double-junction, gel pH electrode
•HI 7662 stainless steel temperature probe with 1 m (3.3’’) cable
•pH 4.01 & pH 7.01 buffer solutions, 20 mL sachet
•HI 700661 electrode cleaning solution
•100 mL plastic beaker
•3 x 1.5V AAA Batteries
•Instruction manual
•Rugged carrying case
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.
GENERA L DESCRIPTION
HI 9126 is a state-of-the-art waterproof, heavy-duty pH meter designed to provide laboratory results and accuracy under harsh industrial conditions.
A large multil-level LCD, with clear indications related to the electrode and instrument status, pH and temperature displayed simultaneously, and user friendly graphic symbols during calibration.
This meter is provided with a series of new diagnostic features which add an entirely new dimension to pH measurement, by allowing the user to dramatically 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 calibration
•Custom calibration (up to two custom buffers)
•Messages on the LCD to make the calibration easy and accurate
•Diagnostic features to alert the user when the electrode needs cleaning
•Monitoring of the electrode aging
•User-selectable “calibration time-out” to remind you when a new calibration is necessary
HI 9126 can also measure for Oxidation Reduction Potential in the mV range with a resolution of 0.1 mV.
It offers an extended temperature range from –20 °C (–4 °F) to 120 °C (248 °F).
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FUNCTIONA L DESCRIPTION
1)Liquid Crystal Display (LCD).
2)RANGE key, to select pH or mV.
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/CUST BUF key, to recall the stored value from memory or to enter custom buffer values.
10)MEM/CLR key, to store the reading in memory or to clear calibration.
11)π and θ keys, for manual temperature setting, entering menu parameters or changing buffer value.
12)LIGHT key, toggle to switch the display backlight on and off.
13)Secondary display.
14)Primary display.
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SPECIFICATIONS
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–2.00 to 16.00 pH |
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RANGE |
±699.9 mV / ±1999 mV |
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–20.0 to 120.0 °C (–4.0 to 248.0 °F) |
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0.01 pH |
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RESOLUTION |
0.1 mV / 1 mV |
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0.1 °C (0.1 °F) |
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±0.01 pH |
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ACCURACY |
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±0.2 mV / ±1 mV |
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@ 20 ºC / 68 ºF |
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±0.4 °C (±0.8 °F) |
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(excluding probe error) |
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±0.02 pH |
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Typical EMC Deviation |
±0.2 mV / ±1 mV |
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±0.4 °C (±0.8 °F) |
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1 or 2-point, with 7 memorized buffers |
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pH Calibration |
(pH 1.68, 4.01, 6.86, 7.01, 9.18, |
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10.01, 12.45) and 2 custom buffers |
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Offset Calibration |
±1 pH |
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Slope Calibration |
From 80 to 108% |
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Automatic, from –20.0 to 120.0 °C ( |
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Temperature Compensation |
–4.0 to 248.0 °F) or manual |
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without temperature probe |
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pH Electrode |
HI 1230B (included) |
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Temperature Probe |
HI 7662 (included) |
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Input Impedance |
1012 ohms |
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3 x 1.5V AAA size batteries |
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Battery Type & Life |
approx. 200 hours of continuous use |
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without backlight (50 hours with |
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backlight) |
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Auto-off |
User selectable: 20 minutes or disabled |
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Dimensions |
185 x 72 x 36 mm (7.3 x 2.8 x 1.4”) |
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Weight |
300 g (10.6 oz.) |
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Environment |
0 – 50 °C (32 – 122 °F) |
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max RH 100% |
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Warranty |
2 years |
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OPERATIONA L GUIDE
INITIAL PREPARATION
The meter is supplied with batteries (for details see page 19).
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 the meter's 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 LCD segments and then the battery percentage while the instrument performs a self check (or as long as the button is held).
The meter will automatically enter measurement mode.
After measurement switch the meter off. Clean the electrode and store it with a few drops of HI 70300 storage solution in the protective cap. To save the batteries, the auto-off feature turns the meter off after 20 minutes (no button pressed). To disable this feature, see “Setup Menu” section on page 16.
pH MEASUREMENTS
To take a pH measurement remove the electrode protective cap and 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.
Allow time for the reading to stabilize.
3 cm
(1¼”)
The LCD will show the pH measurement and the temperature of the sample.
In order to take more accurate pH measurements, make sure that the instrument is calibrated (see page 10 for details).
The glass bulb and the junction on your electrode should always be moist, never allow it to dry out.
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 reading is directly affected by temperature. In order for the meter to measure the pH accurately, temperature must be compensated for. If the sample temperature is different from the temperature at which the pH electrode was kept, allow a few minutes for thermal equilibration.
To use the meter's Automatic Temperature Compensation feature, submerse 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 the “°C” (or “°F”) indicator will blink.
The temperature can now be adjusted with the ARROW keys.
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ORP MEASUREMENTS
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.
Submerse the ORP electrode 3 cm (1¼”) into the sample to be tested and wait 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 is 1 mV.
The ATC (or MTC) key is turned off because the 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 the response time (see “Accessories“ section).
Notes:
•When the reading is out of range, the display will flash the closest full-scale value.
•If using a pH electrode while in mV mode, the meter will measure the mV generated by the pH electrode.
MEM & MR FUNCTIONS
Pressing the MEM key will memorize the reading on the display and store it in the internal memory. The pH (mV) and temperature, electrode condition and the buffers used for calibration will be stored. The “MEMORIZE” tag blinks and the display remains frozen until the MEM key is pressed again.
Note: While in MEM mode, the user can switch between pH and mV by pressing the RANGE key.
A stored value can be recalled by pressing MR: the display will show the memorized reading and the “RECALL MEMORIZED” tag, as long as the MR key is pressed.
Note: MR will only display the range that was active when MEM was pressed.
BACKLIGHT FEATURE
The meter is provided with a Backlight feature, which can be easily accessed through the LIGHT key.
Note: The backlight automatically shuts off after approximately 1 minute of nonuse.
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pH CALIBRATION
It is recommended to calibrate the instrument frequently, if high accuracy is required.
The instrument should be recalibrated:
•Whenever the pH electrode is replaced.
•At least once a week.
•After testing aggressive chemicals.
•When extreme accuracy is required.
•When the calibration time-out is expired (if feature is enabled).
PROCEDURE
The meter offers a choice of 7 memorized buffers (1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45 pH) and two user defined values, C1 and C2 (see “Custom Buffer Selection” section on page 12 for details).
•Pour a small quantity 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.
TWO-POINT CALIBRATION
•Press the CAL key. The “CAL” and “
” indicators will be displayed. The secondary LCD will display buffer “7.01”. If a different calibration buffer is desired (e.g. “6.86”), use the ARROW keys to change the displayed value.
•Submerse the electrode approximately 3 cm (1¼”) into the solution, place the temperature probe as close as possible to the electrode and stir gently.
• The LCD will flash “WAIT NOT READY” for 12 seconds, then:
if the reading is not close to the selected buffer, “WRONG 
“ and “WRONG 
” will blink alternatively; if it is close to the selected buffer the meter will advise the user with an
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audible signal (if enabled) when the reading becomes stable and the display will change to “READY” and blinking “CFM”.
•Press the CFM key to confirm the calibration: the meter stores the first calibration point; the primary LCD will show the calibrated reading, while the secondary LCD will show the second buffer to be used for calibration (“pH 4.01”).
If you’re going to calibrate with a different buffer, select the desired value by pressing the arrow keys.
Note: The meter automatically skips the buffer used for the first calibration point to avoid erroneous procedure. A difference of at least 1.5 pH unit is required between the two buffers: once calibrated at either pH 7.01 or 6.86, the instrument automatically ignores the other value for the second point (same for pH 10.01 and 9.18).
•Submerse the electrode approximately 3 cm (1¼”) into the second buffer solution, place the temperature probe as close as possible to the electrode and stir gently.
•The LCD will flash “WAIT NOT READY” for 12 seconds, then:
if the reading is not close to the selected buffer, “WRONG 
“ and “WRONG 
” will blink alternatively; if it is close to the selected buffer the meter will advise the user with an audible signal (if enabled) when the reading becomes stable and the display will change to “READY” and blinking “CFM”.
•Press the CFM key: the value is stored in memory and the meter returns to measurement mode. The tags corresponding to the buffers used for calibration and the “condition” bargraph (if enabled) will be light up.
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