Disturbances; System Messages - wtw OxiTop IS 6 Instruction Manual

Disturbances / System messages

Disturbances

· Measured value remains below measuring range
The display shows zero or too low a value.
The measuring equipment is not water-tight.
Check rubber quiver, screw top and bottle.
Insufficient sample pretreatment or preservation.
The temperature of the sample had not sufficiently been adjusted (< 15°C).
· Measuring range exceeded.
The measuring range chosen is too small. With very high values (> 2000 mg/l) we
recommend to predilute the sample.
Nitrification inhibitor (allylthiourea) is missing or lacking.
Errors due to procedure have not been mentioned.

System messages

Memory empty ( # = measured value of day 1 is missing)
Change batteries (approx. every 3 years)
Value remains below measuring range (< 0 digits)
Value exceeds measuring range (> 50 digits)
31