Hanna Instruments hi 98129 Benutzerhandbuch

Taking measurements

Taking measurements
Select either EC or TDS mode with the SET/HOLD

button.
Submerge the probe in the solution to be tested. Use

plastic beakers to minimize any electromagnetic inter-

ferences.
The measurements should be taken when the stability

symbol on the top left of the LCD disappears.

The EC (or TDS) value automati-

cally compensated for temperature

is shown on the primary LCD

while the secondary LCD shows

the temperature of the sample.

pH ELECTRODE

pH ELECTRODE MAINTENANCE

MAINTENANCE

• When not in use, rinse the electrode with water to

minimize contamination and store it with a few drops

of storage (HI 70300) or pH 7 (HI 7007) solution in

the protective cap after use. DO NOT USE DISTILLED

OR DEIONIZED WATER FOR STORAGE PURPOSES.

• If the electrode has been left dry, soak in a storage

or pH 7 solution for at least one hour to reactivate it.

• To prolong the life of the pH electrode, it is

recommended to clean it monthly by immersing it in

the HI 7061 cleaning solution for half an hour.

Afterwards, rinse it thoroughly with tap water and

recalibrate the meter.

• The pH electrode can be easily replaced by using
the supplied tool (HI 73128). Insert the tool into the
probe cavity as shown below.

To turn

turn

turn the

the

the meter

meter

meter on

on and

and

and to

to check

check

check battery

battery

battery status

status

Press and hold the MODE button for 2-3 seconds. All

the used segments on the LCD will be visible for a few

seconds, followed by a percent indication of the

remaining battery life. Eg. % 100 BATT.

To change the temperature unit

change the temperature unit

To change the temperature unit (from °C to °F), from

measurement mode, press and hold the MODE but-

ton until TEMP and the current temperature unit are

displayed on the lower LCD. Eg. TEMP °C.
Use the SET/HOLD button to change the temperature

unit, and then press MODE button twice to return to

normal measurement mode.

To freeze

freeze

freeze the

the

the display

display

Press the SET/HOLD button for 2-3 seconds until

HOLD appears on the secondary display.
Press either button to return to normal mode.
To

To turn

turn

turn the

the

the meter

meter

meter off

off

Press the MODE button while in normal measurement

mode. OFF will appear on the lower part of the

display. Release the button.

Notes

Notes:
• Before taking any measurement make sure the

meter has been calibrated.
• To clear a previous calibration, press the MODE

button after entering the calibration mode. The lower

LCD will display ESC for 1 second and the meter will

return to normal measurement mode. The CAL symbol

on the LCD will disappear. The meter will be reset to

the default calibration.
• If measurements are taken in different samples

successively, rinse the probe thoroughly to eliminate

cross-contamination; and after cleaning, rinse the

probe with some of the sample to be measured.

Taking measurements

Taking measurements
Select the pH mode with the SET/HOLD button.
Submerge the electrode in the solution to be tested.
The measurements should be taken when the stability

symbol on the top left of the LCD disappears.

The pH value automatically com-

pensated for temperature is

shown on the primary LCD

while the secondary LCD shows

the temperature of the sample.

Calibration buffer set

Calibration buffer set
• From measurement mode, press and hold the

MODE button until TEMP and the current tempera-

ture unit are displayed on the lower LCD. Eg. TEMP

°C.
• Press the MODE button again to show the current

buffer set: pH 7.01 BUFF (for 4.01/7.01/10.01 cali-

OPERATIONAL GUIDE

ACCESSORIES

pppppH MEASUREMENTS & CALIBRATION

H MEASUREMENTS & CALIBRATION

bration) or pH 6.86 BUFF (for NIST 4.01/6.86/9.18

calibration).
• Press the SET/HOLD button to change the buffer

value.
• Press the MODE button to return to normal mea-

suring mode.

Calibration procedure

Calibration procedure
From measurement mode, press and hold the MODE

button until CAL is displayed on the lower LCD.

Release the button. The LCD will display pH 7.01 USE

or pH 6.86 USE (if you have selected the NIST buffer

set). The CAL tag blinks on the LCD.

• For a single-point pH calibration, place the electrode

in any buffer from the selected buffer set (eg. pH 7.01

or pH 4.01 or pH 10.01). The meter will recognize

the buffer value automatically.
If using pH 4.01 or pH 10.01, the meter will display

OK for 1 second and then return to measurement

mode.
If using pH 7.01, after recognition of the buffer the

meter will ask for pH 4.01 as second calibration

point. Press the MODE button to return to measure-

ment mode or, if desired, proceed with the 2-point

calibration as explained below.

Note

Note: It is always recommended to carry out a two-

point calibration for better accuracy.

• For a two-point pH calibration, place the electrode

in pH 7.01 (or 6.86 if you have selected the NIST

buffer set). The meter will recognize the buffer value

and then display pH 4.01 USE.
Rinse the electrode thoroughly to eliminate cross-

contamination.
Place the electrode in the second buffer value (pH

4.01 or 10.01, or, if using NIST, pH 4.01 or 9.18).

When the second buffer is recognized, the LCD will

display OK for 1 second and the meter will return to

normal measurement mode.

The CAL symbol on the LCD means that the meter is

calibrated.

EC/TDS

EC/TDS MEASUREMENTS & CALIBRATION

MEASUREMENTS & CALIBRATION

To change the EC/TDS conversion factor (CONV)

and the temperature compensation coefficient

βββββ

(BETA)

(BETA)
• From measurement mode, press and hold the

MODE button until TEMP and the current tempera-

ture unit are displayed on the lower LCD. Eg. TEMP

°C.
• Press the MODE button again to show the current

conversion factor. Eg. 0.50 CONV.
• Press the SET/HOLD button to change the conver-

sion factor.
• Press the MODE button to show the current tem-

perature compensation coefficient

. Eg. 2.1 BETA.

• Press the SET/HOLD button to change the tempera-

ture compensation coefficient

• Press the MODE button to return to normal mea-

suring mode.

Calibration procedure

Calibration procedure
• From measurement mode, press and hold the

MODE button until CAL is displayed on the lower

LCD.
• Release the button and immerse the probe in the

proper calibration solution: HI7031 (1413 µS/cm) for

HI98129 and HI7030 (12.88 mS/cm) for HI98130.
• Once the calibration has been automatically per-

formed, the LCD will display OK for 1 second and the

meter will return to normal measurement mode.
• Since there is a known relathionship between EC

and TDS readings, it is not necessary to calibrate the

meter in TDS

The CAL symbol on the LCD means that the meter is

calibrated.

Remove the probe by rotating it counterclockwise and

then pulling it out.

Insert a new pH electrode following the above instruc-

tions in reverse order.

BATTERY REPLACEMENT

The meter displays the remaining battery percentage

every time it is switched on. When the battery level is

below 5%, the

- +

symbol on the bottom left of the LCD

lights up to indicate a low battery condition. The batter-

ies must be immediately replaced. If however the battery

level is so low as to cause erroneous reading, the Battery

Error Prevention System (BEPS) will automatically turn

the meter off.

To change the batteries, remove the 4 screws located on

the top of the meter.

Once the top has been removed, carefully replace the 4

batteries located in the compartment while paying atten-

tion to their polarity.

Replace the top, making sure that the gasket is properly

seated in place, and tighten the screws.

HI 73127

Replaceable pH electrode

HI 73128

Tool to remove the electrode

HI 70004P pH 4.01 solution, 20 mL sachet (25 pcs)

HI 70006P pH 6.86 solution, 20 mL sachet (25 pcs)

HI 70007P pH 7.01 solution, 20 mL sachet (25 pcs)

HI 70009P pH 9.18 solution, 20 mL sachet (25 pcs)

HI 70010P pH 10.01 solution, 20 mL sachet (25 pcs)

HI 77400P pH 4 & 7 solutions, 20 mL sachet (5 each)

HI 7004M pH 4.01 solution, 230 mL bottle

HI 7006M pH 6.86 solution, 230 mL bottle

HI 7007M pH 7.01 solution, 230 mL bottle

HI 7009M pH 9.18 solution, 230 mL bottle

HI 7010M pH 10.01 solution, 230 mL bottle

HI 70030P 12.88 mS/cm @25ºC calibration solu-

tion, 20 mL sachet (25 pcs)

HI 70031P 1413 µS/cm @25ºC calibration solu-

tion, 20 mL sachet (25 pcs)

HI 70032P 1382 ppm @25ºC calibration solution,

20 mL sachet (25 pcs)

HI 70038P 6.44 ppt @25ºC calibration solution, 20

mL sachet (25 pcs)

HI 70442P 1500 ppm @25ºC calibration solution,

20 mL sachet (25 pcs)

HI 7061M Electrode cleaning solution, 230 mL bottle

HI 70300M Electrode storage solution, 230 mL bottle