Xylem WTW OxiTop-i - Troubleshooting OxiTop Measuring Heads; Displayed Measured Value Issues; Signal LED and Keystroke Issues

OxiTop
®
(-i/-IDS) What to do if...
ba77059e01 03/2019 27
6 What to do if...
Displayed measured
value too low
Displayed measured
value too high
Signal LED flashes
red
Measuring head
does not react to
keystroke
Cause Remedy
– The measuring equipment is
untight
– Insufficient sample preparation,
lacking sample conservation.
– The temperature of the sample
had not sufficiently adapted (<
15°C).
– Too few NaOH tablets
– Tighten the measurement equip-
ment
– Carry out suitable sample prepara-
tion, sample conservation
– If possible, repeat the measurment.
– Use the recommended amount of
fresh NaOH tablets
Cause Remedy
– The measuring range selected is
too small.
– Missing or lacking nitrification
inhibitor (ATH)
– With very high values
(> 2000 mg/l):
Dilute the sample and start a new
measurement.
– Use enough nitrification inhibitor
(ATH)
Cause Remedy
– Allowed pressure exceeded
(OFL is displayed, only with
anaerobic degradation tests)
– Vent the sample bottle
– Battery nearly discharged
(the symbol for low battery is dis-
played)
The following measures are taken auto-
matically during a measurement to
avoid data loss:
– Radio connection to the meter (only
for OxiTop
®
-IDS): Off
– Signal LED (green, blue): OFF
The LED flashes red only.
– Display illumination: Off
– Switch-off time: 1 min
The measurement can still be contin-
ued for 7 days after the low battery dis-
play appears.
Cause Remedy
– Operating condition undefined – Press the
<M> and < > keys
simultaneously (reset)