Ph Diagnostic Tests - Hanna Instruments HI 8510 Instruction Manual

pH DIAGNOSTIC TESTS

The HI 8510, HI 8710 and HI 8711 are the
only pH controllers with built-in autodiagnostic
functions to enable the user to check and
troubleshoot any malfunctions.
The functions are made via front panel keys
to isolate the cause of malfunction whether it
is due to pH electrode contamination, inter-
nal offset circuit or the amplifier circuit.
Follow the procedure describe below if you
detect any malfunctioning of the instrument
or electrode.
Press the "MEASURE" button
before pressing any of the fol-
lowing keys.
A) Sensor Test
Immerse the electrode in
pH 7.01 buffer solution
(HI 7007), press the "SEN-
SOR TEST" key and the
display shows the mV re-
sponse of the electrode.
SENSOR
TEST
If the electrode is in good working condi-
tion, the value should be within ±30 mV. A
value between 30 mV and 60 mV or be-
tween -60 and -30 mV indicates some
contamination of the electrode.
If the value is higher than 60 mV or lower
than -60 mV the contamination is too high
and the electrode should be replaced.
44
MEA
SURE
COARSE
SET
FINE
HI 7007
mV