wtw 208210, Instruction Manual

Page: 31 / 44

Disturbances / System messages
31
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 (
IF
= 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)