User Guide

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(4): Whenever the pH/ORP selection item is changed from
pH into ORP or vice versa all of the calibration and setup
data regarding pH (when changing to ORP) or ORP (when
changing to pH) are kept. They are automatically restored if
the measured magnitude is changed back later. The follow-
ing setup items cannot vary when changing from pH to ORP
or vice versa (because they are items strictly related to the
instrument and not to the measured magnitude): Factory ID,
Instrument ID alias RS485 address, Calibration password,
General password, Baud rate, Modem calls answer enable
and Mains frequency.
(5): A life check error is generated if the pH reading does not
vary for more than ±0.10 pH within the time selected through
the “life check time” item (for pH) or mV reading for more
than ±10 mV within the same time (for ORP).
(6): When the instrument is configured for ORP measure-
ments, some of the above items or item values are not any-
more available to the user.
(7): “measured value” is the reading value with a null read-
ing offset adjustment.
(8): If the device is set for MTC (item G.01 to “USEr”) then
items F.10 and F.11 cannot be modified nor seen. When item
G.01 is changed from “AtC” into “USEr”, item F.11 is auto-
matically zeroed.
(9): These items do not vary when the pH/ORP input selec-
tion (“G.00”) is changed.
(10): This item must be set to “OFF” when an amplified
electrode is in use.
(11): Select the frequency of the mains power supply in your
country. This value is used to filter mains power supply noise
when performing the pH/ORP probe check.
(12): Only 2400 can be used for connection to HI 504.