Hanna Instruments HI 8711 - Manual (Page 33)

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HI 8512 and HI 8720 are ORP controllers provided with autodiagnostic
functions that allow to check and troubleshoot any malfunctioning.
The functions are made via front panel keys to isolate the cause of
malfunction.
For HI 8720 only, press MEASURE key before
proceeding with the following tests.
A) 0 mV Test
Press the 0 mV TEST key and the
display should show a value of 0±10
mV, to verify the "zero" calibration of
the instrument. The corresponding LED
turns on.
B) 1000 mV Test
Press the 1000 mV TEST key and the
display should show a value of
1000±20 mV, to verify the slope at
1000 mV. The corresponding LED turns on.
ORP DIAGNOSTIC TESTS ORP DIAGNOSTIC TESTS ORP DIAGNOSTIC TESTS ORP DIAGNOSTIC TESTS ORP DIAGNOSTIC TESTS