Hanna Instruments HI 8424 Manual de usuario

Instruction Manual

HI8424

Portable pH/mV/°C Meter

www.hannainst.com

TABLE OF CONTENTS

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

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

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

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

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

pH CALIBRATION .........................................................................................9

pH BUFFER TEMPERATURE DEPENDENCE ....................................................11

MENU SELECTION......................................................................................12

mV CALIBRATION ......................................................................................13

TEMPERATURE CALIBRATION .....................................................................13

BATTERY REPLACEMENT .............................................................................14

LCD MESSAGES AND TROUBLESHOOTING ....................................................15

ELECTRODE CONDITIONING & MAINTENANCE...............................................17

ACCESSORIES............................................................................................19

pH ELECTRODE APPLICATION REFERENCE GUIDE ..........................................25

Dear Customer,

Thank you for choosing a Hanna Instruments Product.

Please read this instruction manual carefully before using this instrument. This manual

will provide you with the necessary information for the correct use of this instru-

ment, 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.

Remove the instrument from the packing material and examine it carefully to make

sure that no damage has occurred during shipment. If there is any damage, please

contact your local Hanna Instruments Office.

The meter is supplied complete with:

• HI1230B pH electrode

• HI7662 temperature probe

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

• HI700661 cleaning solution, 20 mL sachet (2 pcs.)

• 9V battery

• Instruction manual

Note: Save all packing material until you are sure that the instrument functions

correctly. Any defective items must be returned in the original packing

with the supplied accessories.

HI8424 is a portable microprocessor-based pH/mV/temperature meter.

It features an enhanced user interface, rainproof casing, battery percentage

indication, low battery detection, automatic shut-off, automatic calibration and

error codes to guide the user in calibration and troubleshooting.

The pH calibration procedure automatically recognizes three memorized buffer

values: pH 4.01, 7.01 and 10.01.

This instrument can also measure ORP. The resolution automatically switches from

0.1 mV to 1 mV when readings exceed ±699.9 mV.

The user can set the following parameters by entering the setup mode through

the keyboard:

• enabling or disabling the auto-off feature

• enabling or disabling the acoustic signal

• selecting the temperature unit, °C or °F

GENERAL DESCRIPTION

PRELIMINARY EXAMINATION

1) BNC connector for pH or ORP electrodes

2) Liquid Crystal Display (LCD)

3) RANGE key, to select pH, mV or temperature range

4) Up Arrow key, to manually set the temperature value when no temperature

probe is connected

5) CAL/SELECT key, to enter calibration mode or select menu options

6) CFM/SETUP key, to confirm data or enter/exit setup menu

7) Down Arrow key, to manually set the temperature value when no temperature

probe is connected

8) HOLD key, to freeze the reading on display

9) ON/OFF key, to switch the instrument ON or OFF

10)RCA socket for temperature probe

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 °C/68 °F) ±0.01 pH/ ±0.2 mV/ ±1 mV/ ±0.4 °C/ ±0.8 °F

Typical EMC

Deviation ±0.02 pH/ ±0.2 mV/ ±1 mV/ ±0.4 °C/ ±0.8 °F

pH Calibration

Automatic, 1 or 2 point, with 3 memorized buffer values

(pH 4.01, 7.01, 10.01)

Offset: ±1 pH; Slope: from 75 to 110%

Temperature

Compensation

Automatic, -20 to 120 °C (-4 to 248 °F) or manual

without temperature probe

Probes (included) HI1230B double junction, gel-filled pH electrode

HI7662 temperature probe

Battery Type 9V (1 pc.)

Battery Life Approx. 150 hours of continuous use

Auto-off After 20 minutes of non-use or disabled

(user-selectable)

Environment 0 to 50 °C (32 to 122 °F); RH max 100%

Dimensions 164 x 76 x 45 mm (6.5 x 3.0 x 1.8”)

Weight 180 g (6.3 oz.)

INITIAL PREPARATION

• Remove the electrode protective cap before taking any measurements. If the

electrode has been left dry, soak the tip in HI70300 storage solution for a few

hours or overnight to reactivate it.

• Connect the pH electrode to the BNC connector on the top of the instrument.

• Connect the temperature probe to the RCA connector. The temperature probe can

be used independently to take temperature measurements, or in conjunction

with the pH electrode to utilize the ATC capability of the meter.

• Turn the meter ON by pressing the ON/OFF key. The display shows all the

used segments for a few seconds (or as long as the button is held), followed

by the percentage indication of the remaining battery life, and then enters

normal measurement mode.

pH MEASUREMENTS

• To take a pH measurement simply submerge

the electrode tip (at least 4 cm/1½”) and the

temperature probe into the sample to be tested.

• Select the pH mode by pressing the RANGE key

until the display changes to pH.

• Stir gently and wait for the stability symbol (hourglass) to turn off. The display

will show the pH value automatically compensated for temperature.

Notes:

• In order to take accurate pH measurements, make sure that the instrument

has been calibrated before use (see page 9).

• If measurements are taken in different samples successively, it is recommended

to rinse the electrode thoroughly to avoid cross-contamination. After cleaning, it

is recommended to rinse the electrode with some of the sample to be measured.

OPERATIONAL GUIDE

TEMPERATURE COMPENSATION

The meter is designed to compensate for temperature, as the response of the pH

electrode is directly affected by temperature.

Automatic Temperature Compensation (ATC shown on LCD)

To use the ATC feature, submerge the temperature probe into the sample as close

as possible to the electrode and wait for a few minutes. The displayed pH reading

is compensated for the temperature of the sample.

Manual Temperature Compensation (MTC shown on LCD)

If the temperature probe is not connected, it is possible to enter the temperature

value manually.

• Record the sample temperature by using a ChecktempC (if you are measur-

ing temperature in °C, or ChecktempF for °F readings) or another accurate

thermometer.

• Press RANGE to select the temperature mode. The “°C” (or “°F”) symbol will

blink to indicate that the temperature probe is not connected.

•Use the UP and DOWN keys to display and set

the sample temperature (e.g. 25 °C).

• Press RANGE to select the pH measurement mode and immerse the electrode

into the sample. The displayed pH reading will be temperature compensated

at the set value (in this case at 25 °C).

ORP MEASUREMENTS

Oxidation Reduction Potential (ORP) measurements provide a quantification of

the oxidizing or reducing power of the sample tested.

• Connect the ORP electrode (optional) to the BNC connector.

• To enter the “mV” mode turn the instrument ON and press the RANGE key

until the display changes to mV.

• Submerge the ORP electrode tip (at least 4 cm / 1½”) into the sample to be

tested and allow time for the reading to stabilize

(hourglass symbol turns off).

• Measurements within the ±699.9 mV range are

displayed with 0.1 mV resolution, while outside

this range the resolution is 1 mV.

Notes:

• To perform correct ORP measurements, the surface of the ORP electrode must

be clean and smooth.

• When not in use, the tip of the electrode should be kept moist (use HI70300

storage solution) and safe from any mechanical stress which might cause

damage to the glass/platinum junction.

TEMPERATURE MEASUREMENTS

• Turn the instrument ON and press the RANGE key to select the temperature

mode.

• Make sure the temperature probe is connected to the meter.

• Dip the temperature probe into the sample, allow the reading to stabilize

(hourglass symbol turns off) and read the temperature value.

• Temperature measurements can be displayed in °C or °F units (see “Menu

selection” for details).

Notes:

• A blinking full scale value means that the reading is out of range.

•To freeze a reading on display while in measure-

ment mode, press the HOLD key. The “HOLD” tag

will blink. The pH, mV and temperature values

are held, and the RANGE key can be used to

view the values. Press HOLD again to return to

normal mode.

• If enabled, keypresses are followed with an acoustic signal. A lower note

indicates that the key is not currently active.

• To save battery life, the meter is provided with an auto-off feature, which

turns the instrument off after 20 minutes of non-use. This feature can be

disabled by the user (see “Menu selection” for details).

pH CALIBRATION

For better accuracy, frequent calibration of the instrument is recommended.

The instrument should be recalibrated for pH:

a) Whenever the pH electrode or temperature probe is replaced

b) At least once a week

c) After testing aggressive chemicals

d) When extreme accuracy is required

PREPARATION

Pour small quantities of pH 7.01 (HI7007) and pH 4.01 (HI7004) or pH 10.01

(HI7010) buffer solutions into two clean beakers.

For accurate calibration use two beakers for each buffer solution, one for rins-

ing the electrode tip, and one for calibration. In this way contamination of the

buffers is minimized.

For measurements in acidic samples, it is recommended to calibrate the meter

by using pH 7.01 (HI7007) and pH 4.01 (HI7004) buffers, while for alkaline

measurements use pH 7.01 (HI7007) and pH 10.01 (HI7010) buffers.

PROCEDURE

• Connect the pH electrode and the temperature probe, then switch the meter

ON.

• Remove the electrode protective cap, rinse the electrode

tip with pH 7.01 solution, then immerse the pH electrode

and temperature probe into pH 7.01 buffer solution;

stir gently and wait a few minutes for the electrode to

stabilize and reach thermal equilibrium.

Note: The electrode should be submerged approximately 4 cm

(1½”) into the solution. The temperature probe should

be located close to the pH electrode.

• Press RANGE to display pH measurement.

• Press CAL to enter the calibration mode. The buffer value @25 °C (77 °F)

and the “pH” symbol will blink on the display.

•The meter expects a pH 7.01 buffer.

•When the buffer value is recognized and the

reading is stable, an acoustic signal (if enabled)

advises the user, the “pH” symbol stops flash-

ing, the hourglass indicator disappears and the

“CFM” tag starts blinking to indicate that the

value can be confirmed.

•Press CFM to store the first calibration point.

•The meter expects a pH 4.01 or 10.01 buffer.

•Rinse and immerse the pH electrode and the

temperature probe in pH 4.01 or pH 10.01

buffer (2nd calibration point) and stir gently.

•When the buffer value is recognized and the

reading is stable, an acoustic signal (if enabled)

advises the user, the “pH” symbol stops flash-

ing, the hourglass indicator disappears and the

“CFM” tag starts blinking to indicate that the

value can be confirmed.

•Press CFM to store the second calibration point.

•The meter returns to normal mode.

The pH calibration is now complete; “CAL” and

the pH tags corresponding to the buffers used for

calibration are lit on the LCD.

Notes:

• If the buffer value is not recognized, after 12 seconds the meter will display

blinking dashes together with the “WRONG”

tag. Either the buffer solution is wrong or out

of specification and needs to be replaced or the

electrode is damaged.

• The meter will retain the calibration if the battery is removed.

• To quit calibration and keep previous data: press CAL after entering the

calibration mode and before the first point is accepted.

• To perform a single-point calibration: press CAL after the first point has been

confirmed.

If the temperature probe is not connected and manual temperature compensation

is required, follow the procedure below:

•Press RANGE to select the temperature mode.

•Rinse the pH electrode and place it into the pH 7.01 buffer, stir briefly and

wait a few minutes to reach thermal equilibrium.

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