Xylem PHIX COMPACT pH and Redox Transmitter - Manual (Page 19)

19
Buffer Adjustment
SW 836502
Buffer adjustment using the tilt switch
Remember to clean the electrode as descri-
bed in the previous section!
Only the built-in tilt switch is active, when
the switch ring has been removed for more
than 10 minutes.
The tilt switch inside pHix
® Compact detects
when the electrode tip is turned upwards.
When the electrode tip has been turned
upwards in more than 30 seconds, pHix
®
Compact will go into buffer adjustment
mode.
Proceed as described:
Remove pHix
® Compact from the process,
rinse the electrode, and turn the electrode
upside down.
The buffer adjustment mode is initiated after
approx. 30 seconds - this is indicated by the
LED with 3 short flashes every 5 seconds.
If pHix ® Compact is dipped into a buffer
solution with a value of 4, 7 or 10 pH, pHix ®
Compact automatically search for a buffer
with one of those values. When the correct
value is found, the zero point or span will
automatically be set to the right value. The
LED will give 1 short flash every 5 seconds
for indication of a succesful calibration.
pHix
® Compact is now ready to be put into
service or for another buffer adjustment with
another pH value.
If a new buffer adjustment to another (or
same) pH value, pHix
® Compact is simply
turned upside-down again with the elec-
trode tip pointing upwards in approximately
30 seconds until the LED gives 3 short
flashes every 5 seconds, whereafter above
procedure is repeated.
If pHix
® Compact cannot find the correct
value for the selected buffer liquid, the trans-
mittter will go into fault condition indicated
by a flash every second.
The pHix
® Compact software determines
automatically whether it is the zero point or
the span that need adjustment depending
on the zero point value of the electrode and
the preceeding buffer values.