Hanna Instruments HI 504 User Manual

Page 27

Note

If a cleaning session is being performed, it is possible to stop
it by pressing and holding the and keys together (
key first) or through RS485 by sending the appropriate com-
mand. When the advanced cleaning is aborted, in any case
a complete rinsing phase is performed before the actual ter-
mination of the cleaning action. If the abortion is issued dur-
ing the rinsing phase, the phase continues normally till its
natural end.

Note

Calibration of whatever input or output can not be initiated
while the Simple or Advanced Cleaning is in progress. Con-
versely, cleaning can not be triggered while whatever cali-
bration is being performed.

• Hold mode end delay (set by item C.70): if the device

was controlling when the cleaning action started, then the
hold mode end delay must expire before restarting control.

Advanced cleaning actions are performed in the following or-
der:

• Pre-rinsing time: the device enters hold mode and relay

3 is energized. If the device is in normal measurement mode,
the “PrE-rinSinG” message scrolls on the LCD.

• Detergent washing time: relay 4 is energized (and relay

3 continues to be energized). If the device is in normal
measurement mode, the “dEtErGEnt” message scrolls on
the LCD. It is possible to configure some cleaning without
detergent (setup item L.17). In this case the message dis-
played is “no dEtErGEnt”.

• Rinsing time: relay 4 is de-energized (and relay 3 contin-

ues to be energized). If the device is in normal measurement
mode, the “rinSinG” message scrolls on the LCD.

• Hold mode end delay: if the device was controlling when

the cleaning action started, then the hold mode end delay
must expire before restarting control.

The time each of these actions last for can be configured
through setup menu, items L.00 or L.10, L.11, L.12.

When performing a cleaning action (either “simple “ or “ad-
vanced”) with the device in normal measurement mode, the
secondary LCD displays a countdown for the seconds re-
maining to the cleaning action end.

If the “Repeated cleaning number” value (setup item L.16) is
different from 0, then the advanced cleaning is repeated a
number of times equal to this value after the first cycle (e.g.
one more cycle if L.16=1).