Hanna Instruments HI8424 User Manual

Page 13

HI 8424NEW has been accurately precalibrated for temperature at the factory.
For optimum accuracy, it is recommended to recalibrate the meter for tempera-
ture at least once a year.
Contact your dealer or the nearest HANNA instruments

Customer Service

Center for more information.

HI 8424NEW has been accurately precalibrated for mV range at the factory.
For optimum accuracy, it is recommended to recalibrate the meter for mV
readings at least once a year.
Contact your dealer or the nearest HANNA instruments

Customer Service

Center for more information.

m V C A L I B R A T I O N

V C A L I B R A T I O N

T E M P E R A T U R E C A L I B R A T I O N

TROUBLESHOOTING

Symptom

Problem

Solution

Slow reponse or

Dirty pH electrode

Soak the electrode tip

excessive drift

HI 7061 solution for

30 minutes

Reading fluctuates

Clogged/dirty junction

Soak the electrode tip

up and down (noise)

or low electrolyte level

in warm

HI 7082

(refillable electrodes)

solution for one hour,
then rinse it with
distilled water
(refill with fresh
electrolyte if necessary)

Blinking full scale

Reading is out of range

value

Blinking "°C" (or "°F")

Temperature probe is not connected or broken

"WRONG" &

Calibration error

Check buffer solution or

blinking dashes

replace pH electrode

Blinking battery

Low battery level

Replace battery

symbol

Meter shuts off

Auto-off enabled or
dead battery

Replace battery

"Clr" message

Loaded default

Perform pH calibration

pH calibration values

"Er1" and Er2"

EPROM error

Contact your dealer or

messages

HANNA Service Center

Note: For field applications, it is always recommended to keep a conditioned spare elec-

trode handy. When anomalies cannot be resolved with simple maintenance, change
the electrode and recalibrate the meter.