User Guide

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to the activated error.
Here is reported a list of all the possible error strings:
• “Alarm for setpoint 1”
• “Alarm for setpoint 2”
• “Max relay ON time error”
• “Life check error”
• “pH electrode broken or leakage”
• “Reference electrode broken or leakage”
• “Old pH probe error”
• “Dead pH probe error”
• “Calibration timeout error”
• “Temperature probe broken error”
• “Analog input error”
• “Digital transmitter error”
• “Power reset error”
• “Cellular error”
• “EEPROM corruption error”
• “Watchdog error”
After the submission of the message, a phone call is made by
the instrument to the programmed number(s). This is done
because the SMS can be received with a considerable delay
due to network overload, while the phone call takes place
immediately and has a long ring which is more likely to be
heard. The phone call advises the user that something hap-
pened on the HI 504 and a SMS is going to be received. It
is not necessary for the user to answer the phone call and it is
suggested to close it without any answer.
When an error occurs, a confirmation of the message recep-
tion is waited by the instrument. The confirmation can be
done by the receiver simply calling the HI 504 phone num-
ber (number of the GSM module). The instrument will answer
and send an SMS with its current status (this confirmation is
managed as an information request; see further on for de-
tails).
It is possible to configure the instrument to have repeated
messages sent if confirmation is not received immediately (see
items P.05 and P.06). This user-selectable feature has been
introduced to prevent losing of the warning message due for
example to overload of the telephone lines. The P.05 item sets
the number of repeated messages to send (0 is associated