Temperature Compensation - Hanna Instruments HI504 Instruction Manual

Panel-mounted, microprocessor-based ph/orp process controller
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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
temperature probe error, which will be handled as stated
in the error configuration . 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
automatically set to "USEr" (see below) .
After that, the Pt100/Pt1000 input continues to be moni-
tored 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 tempera-
ture compensation will be performed, no matter whether
the temperature 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  or  key . Pressing
once the  key it will add 0 .1 °C to the actual temperature
value, while pressing the  key it will subtract 0 .1 °C .
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