User Guide

If the error is due to impossible communication with the

EEPROM or the RTC, all the pH/ORP controller tasks are

stopped, the alarm relay is de-energized, the red LED blinks

and the “Serial bus error” slides forever (repair can not be

postponed).

A software watchdog is provided in order to detect dead loop

conditions or other causes that make the software stuck. If it

happens, a software reset is generated after a time-out of 1

second.

SELFTEST PROCEDURES

The selftest procedure can be made only entering the setup

menu and selecting one of the items of the “tESt” group (t.00

- t.08).

Note All the tests are made while in setup mode, where a time-out

is present. If no action is performed for about 5 minutes, the

mode is automatically exited and the instruments returns to

previous mode.

DISPLAY TEST

The display selftest procedure consists of lighting up all the

display segments together.

• To start the procedure select setup

item t.00 and an “OFF” blink-

ing message will appear on the

primary LCD.

• Press the  (or ) key once and

the message will switch to a blink-

ing “GO”.

• Press CFM key to confirm or the

 (or ) key again to return to

the previous status.

• If confirmation is given when the

“OFF” message is blinking, no ac-

tion is performed and it will move

to the next setup item (t.01).