IM 12D7B2-E-H
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1. What is HOLD?
Hold is a function which freezes the output
signal temporarily, it is normally used during
maintenance when the cell is removed from
the measured solution to prevent unwanted
controller reaction.
The HOLD function must be commissioned
from the programming menu before it can
be switched on or off. See commissioning
the hold function for more details.
Note:
AUTO RETURN will switch off HOLD after
20 minutes, see § 7-8.
2. How does it work?
From this level the HOLD function can only
be switched ON or OFF.
HOLD is switched on when you press YES
when HOLD and YES/NO are blinking.
When you press NO hold will be switched
off
A flag is kept in memory and an indication is
made in the upper left corner of the display
field.
The HOLD function only influences the out-
put signal, no other functions are influenced.
The operator is prompted to switch HOLD
on or off after having performed a mainte-
nance function.
3. Example
During the transfer of cleaning liquid into a
batch reactor with a conductivity-control
system, the HOLD function is switched ON
to prevent the controlling instruments from
running wild.
After cleaning has ceased and the new
batch has been started HOLD is switched
OFF again and conductivity control resu-
mes.
5-3. Use of HOLD function
Summary of Contents for SC200
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