Hanna Instruments HI 504 - Manual (Page 19)

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if M2 = “PIdL” then D2 R A2 and -2.00 pH or -2000 mV R S2-A2;
if M1 = “OOHI” and M2 = “OOLO” then S1-H1 S S2+H2;
if M1 = “OOLO” and M2 = “OOHI” then S2-H2 S S1+H1;
if M1 = “PIdH” and M2 = “OOLO” then S1 S S2+H2;
if M1 = “OOLO” and M2 = “PIdH” then S1+H1 R S2;
if M1 = “PIdL” and M2 = “OOHI” then S1 R S2-H2;
if M1 = “OOHI” and M2 = “PIdL” then S1-H1 S S2;
if M1 = “PIdH” and M2 = “PIdL” then S1 S S2;
if M1 = “PIdL” and M2 = “PIdH” then S2 S S1;
were the minimum deviation (DN) is 0.5 pH (pH) or 25 mV (mV).
(2): The calibration/hold password allows only calibrations
and hold mode through keyboard for service personnel, while
the general password allows everything (including calibra-
tion). Obviously, the general password and the calibration/
hold password cannot be viewed among other items when
the “SETUP” key is pressed without entering the right general
password. The pH controller is sold with the general pass-
word set to “0000”.
(3): When a wrong setup value is confirmed, the pH control-
ler does not skip to the next setup item, but remains in the
current item displaying a blinking “WRONG” indicator till
the parameter value is changed by the user (the same thing
happens also for the setup code selection). In some situa-
tions user cannot succeed in getting a parameter set to the
desired value if related parameters are not changed accord-
ingly first (e.g. to set a pH high set point to 10.00 the high
alarm must be set to a value greater than 10.00 first).
(4): The hardware identifier is a read only value.
(5): When the controller is powered, RTC is checked to see if
an RTC reset occurred since last software initialization (if one
ever took place). If this is the case the RTC is initialized with
the default date and time 01-01-2000 - 00:00. An EEPROM
reset does not affect the RTC settings.
(6): Output is pH or mV depending on the controlled magni-
tude setting (pH or ORP).
(7): The value for error configuration is coded like this: