User Guide

ManualsBrandsHanna Instruments ManualsSensorsHI 981402

• Do not be alarmed if white crystals appear around the

electrode protective cap. This is normal with pH elec-

trodes and they dissolve when rinsed with water.

• 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. Always replace the protective cap after use.

DO NOT USE DISTILLED OR DEIONIZED WATER FOR

STORAGE PURPOSES.

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

storage (HI 70300) or pH 7 (HI 7007) solution for at

least one hour to reactivate it.

• To minimize clogging and provide longer life for the pH

electrode, it is recommended to clean it monthly. Im-

merse the tip of the electrode in HI 7061 for one hour

and then rinse it with tap water.

TAKING pH MEASUREMENTS

• Turn the meter on by connecting the

12 VDC power adapter to the meter

and to the mains.

• Remove the protective cap from the

pH electrode and immerse the tip

(4 cm/1½”) of pH electrode in the

sample.

• The LCD will show the pH value. Allow the

reading to stabilize and the instrument

will start continuous monitoring.

Note: to prevent damages to the electrode, remove the pH

electrode from the sample before turning the meter off.

ADJUSTING THE SETPOINT

With HI 981402 and HI 981403 you can select your own

setpoint and be alerted with a visual LED alarm when an

abnormal situation arises.

• Unscrew and remove the rear panel and gasket seal to

access the MEASURE/SET switch and the setpoint adjust-

ment trimmer.

• Move the switch to the left (SET).

For the greatest accuracy, frequent calibration of the instru-

ment is recommended. In addition, the instrument must be

recalibrated whenever:

a) The pH electrode is replaced.

b) After testing aggressive chemicals.

c) Where extreme accuracy is required.

d) At least once a month.

PREPARATION

Pour small quantities of pH

7.0 (HI 7007) and pH 4.0

(HI 7004) solution into two

clean beakers.

For accurate calibration use two beakers for each buffer

solution, the first one for rinsing the tip of the electrode and

the second one for calibration. This way, contamination of

the buffers is minimized.

CALIBRATIONCALIBRATION

CALIBRATION

HI 7004 HI 7007HI 7004 HI 7007

I 7

• With a small screwdriver adjust the setpoint trimmer to

display the desired value in the range 3 to 11 pH (HI

981402) or 6 to 9.5 pH (HI 981403).

• Make sure the switch is moved back to the

right (MEASURE Mode).

• Replace the rear panel and the gasket, ensuring the

unit is properly closed.

• In HI 981402, whenever the pH

reading varies by more than ±0.5

pH from the setpoint, the red alarm

LED blinks to warn the user.

In HI 981403 the alarm LED

starts blinking when the pH read-

ing becomes greater than setpoint

and stops blinking only when

the reading becomes 0.5 pH lower

than setpoint.

HI 7007

RINSE

HI 7007

CALIBRATION

pH 4.0 (HI 7004) is recommended for measuring acidic

samples. Use pH 10.0 (HI 7010) if subsequent samples are

alkaline.

CALIBRATION PROCEDURE

• Turn the meter on and make sure that

the MEASURE/SET switch is on the MEA-

SURE mode.

• Remove the protective cap from the

electrode, rinse and immerse it in a pH

7.0 buffer. Stir gently and then wait a

couple of minutes for the reading to

stabilize.

Note: the electrode should be sub-

merged approximately 4 cm

(1½”) in the solution.

• Adjust the right hand trimmer

with the calibration screwdriver

until the LCD shows pH 7.0.

• Rinse and immerse the pH electrode in

pH 4.0 (or pH 10.0) buffer and stir

gently.

• Wait a couple of minutes and

then adjust the left hand trim-

mer until the LCD shows the

value of the second buffer.

The pH calibration is now complete.

4 cm

(1½

CE DECLARATIONCE DECLARATION

CE DECLARATION

OF CONFORMITYOF CONFORMITY

OF CONFORMITY

Recommendations for Users

Before using this product, make sure that it is entirely suitable for the environment in

which it is used. Operation of this instrument in residential areas could cause unaccept-

able interferences to radio and TV equipment.

The glass bulb at the end of the electrode is sensitive to electrostatic discharges. Avoid touching

this glass bulb at all times. During operation, ESD wrist straps should be worn to avoid possible

damage to the electrode by electrostatic discharges.

Any variation introduced by the user to the supplied equipment may degrade the instrument’s

EMC performance.

To avoid electrical shock, do not use this instrument when voltages at the measurement surface

exceed 24 VAC or 60 VDC. To avoid damages or burns, do not perform any measurement in

microwave ovens.

ACCESSORIESACCESSORIES

ACCESSORIES

HI 1286 Double junction, plastic body pH electrode

with 2 m (6.6’) cable and BNC connector

HI 2114P/2 Double junction, plastic body pH electrode

with 2 m (6.6’) cable and BNC connector

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

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

HI 7004L pH 4.01 solution, 460 mL bottle

HI 7007L pH 7.01 solution, 460 mL bottle

HI 7061L Electrode cleaning solution, 460 mL bottle

HI 710005 12 VDC power adapter, US plug

HI 710006 12 VDC power adapter, European plug

HI 710012 12 VDC power adapter, Australian plug

HI 710013 12 VDC power adapter, Southern Africa plug

HI 710014 12 VDC power adapter, UK plug

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

ISTR9814R1 07/98PRINTED IN PORTUGAL