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TEMPERATURE COMPENSATION
If the setup item G.01 is set to “AtC” an automatic tempera-
ture compensation will be performed using the temperature
value acquired with the Pt100/Pt1000 input.
If the probe appears to be unconnected, or anyway it does
not give a valid temperature (temperature outside the -30 to
130°C range), the instrument will generate a broken tem-
perature probe error. In this case the temperature will be
automatically set to the setup item G.02 (“Manual or probe
error temperature”) and the setup item G.01 will be auto-
matically set to “USEr” (see below).
After that, the Pt100/Pt1000 input continues to be monitored
to track the Pt100/Pt1000 error closing.
The setup item G.01 is automatically changed back to “AtC”
when the Pt100/Pt1000 error is closed.
During error condition, if the user decides to start working in
manual mode (and so manually close the error), he has to
go in setup menu (item G.01), change the value to “AtC”
(automatic compensation) without giving confirmation, then
change again to “USEr” and finally give confirmation by
pressing the CFM key.
If the setup item G.01 is set to “USEr” a manual temperature
compensation will be performed, no matter whether the tem-
perature probe is connected to the Pt100/Pt1000 input or not.
The start value for temperature, when entered the manual
mode, is the one stored at G.02 (“Manual or probe error
temperature”).
If the user wants to change the temperature value while in
manual mode, he has to press the æ or key. Pressing once
the æ key it will add 0.1°C to the actual temperature value,
while pressing the key it will subtract 0.1°C.
During these operations both the temperature value displayed
and setup item G.02 are updated (the last one is updated
with a maximum delay of 10s).
pH/ORP PROBE CHECK
The pH electrode and the reference electrode for both pH
and ORP can be automatically monitored through HI
504910.
Setup items involved are I.13 (pH electrode impedance test
enable), I.14 (reference electrode impedance test enable) and
I.15 (maximum reference electrode impedance).
A “pH electrode broken or leakage error” (error code: 10) is
generated whenever the pH electrode impedance is less than
1 MΩ. This error can be due to breakage of the electrode
glass or short circuits caused by moisture or dirt.
A “reference electrode broken or dirty or not immersed” error
(error code: 11) is generated whenever the reference elec-
trode impedance is greater than the value set in item I.15
(maximum reference electrode impedance range is 0.5 to
100.0 KΩ, default is 50.0 KΩ). This error can be due to
soiling of the reference electrode. It can occur also when the
reference electrode or the matching pin are not immersed in
the solution.
The pH electrode test is performed when the following condi-
tions are satisfied:
• the test has been enabled through the setup item I.13;
• the device is in one of the following modes: measure, last
calibration data scrolling, event log file scrolling;
• the device is configured to measure pH.
Note If an amplified electrode is used, the pH electrode test
must be disabled by the user through the setup item
I.13.
The reference electrode test is performed when the following
conditions are satisfied:
• the test has been enabled through the setup item I.14;
• the device is in one of the following modes: measure, last
calibration data scrolling, event log file scrolling.
Note When testing or calibrating the instrument through a
pH/ORP simulator like HI 931001 or HI 8427, tempo-
rarily set the item I.13 to “OFF” and short the Match-
ing pin and the Reference pin terminals.
