Hanna Instruments hi 98143-20 User Manual

PRINTED IN PORTUGAL

For better accuracy, frequent calibration of the instrument is

recommended. In addition, the instrument must be recali-

brated for pH:
a) Whenever the electrode is replaced.
b) After testing aggressive chemicals.
b) At least once a month.

pH CALIBRATION

Pour small quantities of pH 7.0 (HI7007)

and pH 4.0 (HI7004) solution into two

clean beakers.
Calibration with pH 4.0 (HI7004) solution is recommended

for measuring acidic samples. Use pH 10.0 (HI7010) solu-

tion if subsequent samples are alkaline.
• Connect a multimeter to the pH output terminals and

set it to Voltage readings.

• Turn the transmitter on.
•

Rinse the electrode and immerse it in a pH

7.0 buffer together with the grounding

probe. Stir gently and then wait for the

reading to stabilize.

• Adjust the pH Offset Calibration Trimmer with a small

screwdriver until the multimeter displays 12.00 mA.

CALIBRATION

Note: to prevent damage to the electrode, disconnect the

pH electrode before turning the meter off.

• Rinse the pH electrode and the grounding

probe, and immerse them in pH 4.0 (or

pH 10.0) buffer. Stir gently and wait for a

couple of minutes.

• Adjust the pH Slope Trimmer until the multimeter shows

the corresponding mA value of the second buffer (8.57

mA for pH 4 and 15.43 mA for pH 10 solution).

The pH calibration is now complete.

EC CALIBRATION

• Connect a multimeter to the EC output terminals and set

it to Voltage readings.

• Turn the transmitter on.

• The HI3001 EC probe must be dry.
• Adjust the EC Offset Calibration Trimmer with a small

screwdriver until the multimeter displays 4.00 mA.

• Pour a small quantity of 5.00 mS/cm calibration solu-

tion in a beaker.

• Immerse completely the tip of the EC probe in the

conductivity solution.

• Tap the probe and stir it to ensure that

no air bubbles are trapped inside the

sleeve. In the case of in-line applications,

to better simulate the installation ambi-

ent, put the probe tip close to the bottom

edge of the beaker.

• Allow the reading to stabilize and then adjust the EC

Slope Calibration Trimmer until the multimeter displays

12.00 mA.

The EC calibration is now complete.

MAINTENANCE

pH ELECTRODE MAINTENANCE

• 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 tap 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. 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.

EC PROBE MAINTENANCE

• Remove the conductivity probe and rinse it with tap

water. If a more thorough cleaning is desired, remove

the protective plastic sleeve and clean the platinum
sensors with a nonabrasive cloth or
HI 7061 cleaning solution. Reinsert
the sleeve while paying attention
that the hole touches the threaded
edge.

O U T P U T

The output must be feed by an external power supply,

which can be the same used for the meter. Carefully follow

the first connection diagram.

If an additional power supply is used to feed the inputs,

follow the second connection schema. Note that the negative

sockets are connected with the negative power supply.

ACCESSORIES

HI 1283

Stainless steel grounding probe with 2 m

(6.6’) cable

HI 1001

“flow-thru” double junction pH electrode with

3 m (6.6’) cable and BNC connector

HI 3001

“flow-thru” 4-platinum ring EC probe with 3

m (6.6’) cable and temperature sensor

HI 7004M

pH 4.01 buffer solution, 230 mL bottle

HI 7007M

pH 7.01 buffer solution, 230 mL bottle

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

HI 7039M

5.00 mS/cm (EC) calibration solution, 230

mL bottle

HI 7061M

Electrode cleaning solution, 230 mL bottle

HI 710005 115 to 12 VDC power adapter

HI 710006 230 to 12 VDC power adapter

CE DECLARATION 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 unacceptable interfer-

ences to radio and TV equipment. The glass bulb at the end of the electrode is sensitive to

electrostatic discharges. Avoid touching this glass bulb all the time. The metal band at the end

of the EC electrode is sensitive to electrostatic discharges. Avoid touching this metal band all

the time. 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.