Xylem PHIX COMPACT pH and Redox Transmitter - Manual (Page 17)

17
Buffer Adjustment
SW 836502
Cleaning
Before initiation of a buffer adjustment, the
electrode should be rinsed in running water
and additionally in demineralized water be-
fore the electrode is lowered into the buffer
liquid - and again between every step in the
buffer adjustment process.
Use only fresh buffer solutions! Dispose of
any used buffer liquid.
Take care that transmitter, electrode and
buffer solution has the same temperature -
preferably approx. 25 °C.
Put eventually pHix ® Compact in a bucket
of lukewarm water before commencing a
buffer adjustment.
Buffer adjustment using the switch ring
Remember to clean the electrode as descri-
bed in the previous section!
When the switch ring has been put on for at
least 10 minutes, it will only be possible to
buffer adjust pHix
® Compact with the switch
ring.
The switch ring has 4 positions, and must
only be set to one of these positions in order
to obtain correct function:
Pos.: Function:
M Measurement.
The switch ring should always be in this
positioni during normal service (measuring)
This is indicated by the LED that is flashing
for approx. every 5 seconds.
4 Buffer adjustment in buffer with
pH value pH 4.
7 Buffer adjustment in buffer with
pH value pH 7.
10 Buffer adjustment in buffer with
pH value pH 10.
If the switch ring is set to one of the positi-
ons 4, 7 or 10, the LED will give out 3 short
flashes every 5 seconds.
If pHix
® Compact is being put into a buffer
liquid with the same value as the switch
ring is set to, pHix
® Compact will automa-
tically begin to scan for a buffer with the
same value. When the value is found, pHix
®
Compact will automatically set the 0-point
or span to the correct value, and the LED
will indicate this with 2 short flashes every 5
seconds.
pHix
® Compact is now ready either for mea-
surement or for another buffer adjustment at
another pH value.
pHix
® Compact determines automatically
if zero point or span need to be adjusted
depending of the electrode's zero point and
the preceeding buffer values.
If pHix
® Compact cannot find the pH value
for the selected buffer solution, it will go
into alarm condition, which is indicated with
continuous LED flashes every second.