Sometimes Po4 Seems To Be Too High - Focustronic Mastertonic User Manual

The values, specially KH, Mg, Ca, are at the lowest
or highest ranges all time.
As long as MT is correct calibrated, it has its accuracy and precision specified below.
But if you notice that the values are always very
close at the max or min limits,
then it could be something wrong.
Then go through this check list:
• Syringe correct calibrated? Test with "test
syringe" and it should be 0.6 ml.
• Stepper pump correct calibrated? Test pump and it shall be 7.0 ml. Also note that
when you calibrate and/or test, you may have to redo a few times to be sure hose
is fully primed. See section in this manual about calibration.
• Hoses that take RO water and/or sample water has float up?
• Is there RO water enough in the RO container?
• Is reagent less than 8 ml in the reagent vials? (Then needle will not get any fluid).
• Have you had a leakage last day/s? Then light sensor might have been humid
and need drying. Do a light sensor test (maintenance section) and you should
get values back around 1500-3000. If not (like 0-100 values) , dry the sensor
according to instructions here.
• Have you forgot to place the magnetic bar in the reaction chamber?
• Is the needle broken?
• Have you mounted the second ventilation needle?
• Are the reagent placed in correct carousel position?, see page 9-10.
Sometimes PO
During some circumstances it can be a minor "contamination conflict " between
nitrate reagent and phosphate reagent. This is 100% solved by just avoid to do a PO
immediately after a NO
order PO -NO and not NO
4 3
seems to be too high
4
So if you want to do NO
3.
-PO when you make the schedule. See also here.
3 4,
Mg 790 - 1580 mg/l
2+
Ca 303 - 561 mg/l
2+
KH 6.08 - 12.16 dKH
and PO after each other, use the
3 4
26
4