Hanna Instruments HI 9126 Manual de usuario

Instruction Manual

HI9126

Calibration Check

Waterproof

pH/mV/°C Meter

www.hannainst.com

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 [email protected] or view our worldwide contact list at

www.hannainst.com.

PRELIMINARY EXAMINATION .........................................................3

GENERAL DESCRIPTION..................................................................3

FUNCTIONAL DESCRIPTION.............................................................4

SPECIFICATIONS............................................................................5

OPERATIONAL GUIDE.....................................................................6

pH CALIBRATION .........................................................................10

pH BUFFER TEMPERATURE DEPENDENCE ......................................15

SETUP MENU..............................................................................16

mV CALIBRATION.........................................................................18

TEMPERATURE CALIBRATION........................................................18

BATTERIES REPLACEMENT............................................................19

LCD MESSAGE GUIDE...................................................................21

TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS.................22

ELECTRODE CONDITIONING & MAINTENANCE.................................23

TROUBLESHOOTING GUIDE ..........................................................25

ACCESSORIES..............................................................................26

TABLE OF CONTENTS

GENERAL DESCRIPTION

HI9126 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

HI9126 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).

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 combination double‑junction, gel pH electrode

• HI7662 stainless steel temperature probe with 1 m (3.3’’) cable

• pH 4.01 & pH 7.01 buffer solutions, 20 mL sachet

• HI700661 electrode cleaning solution

• 100 mL plastic beaker

• 1.5V AAA Batteries (3 pcs.)

• 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.

PRELIMINARY EXAMINATION

GENERAL 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 calibra‑

tion.

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 during calibration.

10) MEM/CLR key, to store the reading in memory or to clear calibra‑

tion.

11) and 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.

FUNCTIONAL DESCRIPTION

SPECIFICATIONS

Range

–2.00 to 16.00 pH

±699.9 mV / ±1999 mV

‑20.0 to 120.0 °C (–4.0 to 248.0 °F)

Resolution

0.01 pH

0.1 mV / 1 mV

0.1 °C (0.1 °F)

Accuracy

@ 20 ºC / 68 ºF

±0.01 pH

±0.2 mV / ±1 mV

±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 7 memorized buffers (pH 1.68,

4.01, 6.86, 7.01, 9.18, 10.01, 12.45) and

2 custom buffers

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 size batteries

approx. 200 hours of continuous use

without backlight (50 hours with backlight)

Auto‑off User selectable: 20 minutes or disabled

Dimensions 185 x 72 x 36 mm (7.3 x 2.8 x 1.4”)

Weight 300 g (10.6 oz.)

Environment 0 – 50 °C (32 – 122 °F)

max RH 100%

Warranty 2 years

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 HI70300 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 (11/4”) 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.

OPERATIONAL GUIDE

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, 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 the “°C” (or “°F”) indicator will blink.

The temperature can now be adjusted with the ARROW keys.

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.

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 (11/4”) 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.

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.

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 dis‑

played. 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 audible

signal (if enabled) when the reading

becomes stable and the display will

change to “READY” and blinking “CFM”.

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