Hanna Instruments HI 504, Инструкция по эксплуатации

Страница: 17 / 116

17
• The pH calibration value will switch
to 7 .00, the first digit starts blinking
and it is possible to change its value
simply using the

or

key .
• Once selected the first digit value, press the  key: the first
digit will be fixed and the second one will start blinking .
Pressing of the
 key repeatedly will result on circularly
moving on the secondary LCD .
• When the desired calibration value is reached (must be
within 0 .00 to 16 .00 pH), press the CFM key to confirm
and the calibration will proceed as described above .
• If the selected value is outside boundaries, the confir-
mation is not accepted and the first digit keeps blinking
(waiting for confirmation of a valid value) .
Note
If SETUP key is pressed instead of CFM, the calibration
value selection is aborted and the meter reverts back to a
two-point calibration .
ORP CALIBRATION
To perform ORP calibration it is necessary to connect an
HI931001 or HI8427 simulator to the BNC socket .
The meter has to be set as ORP controller .
• Set item I .04 to “OFF” to disable the Matching Pin .
• A two-point calibration has to be performed: the first
point value is 0 mV and the second one can be chosen
between 350 mV and 1900 mV .
• Enter the calibration mode, select the ORP calibration
(use the

and

keys to move through setup menu) and
press the CFM key .
• Set the HI931001 or HI8427 simulator to 0 mV .
• The primary LCD will display
the current mV measure and the
secondary LCD will show the first
calibration point (0 mV) .