What To Do If; Technical Data - Xylem wtw NO 800 DIN Operating Manual

What to do if ...

Measured value
unstable
Slope too low
Measuring range
Reproducibility
pH range
Temperature range
Membrane resis-
tance
Length
Diameter
22
What to do if ...
Cause
– Inner junctions not
sufficiently wetted with
bridge electrolyte
– Junctions encrusted
– Cable broken
Cause
– Conditioning time too short
– Standard solutions too old
– Junctions encrusted
– Electrode defective

Technical data

0.4 ... 62,000 mg/l NO
± 2 %
2.5 ... 11 (see section I
0 ... 40 °C
1 to 5 MΩ
170 mm (including 50 mm connection head)
Shaft: 12 mm
Connection head 16 mm
Remedy
– Fill up bridge electrolyte until the inner
junctions are covered with bridge
electrolyte
– Leave the bridge electrolyte to react on
the junctions for some hours until the
crusts have dissolved.
– Exchange the electrode
Remedy
– Extend the conditioning time
– Use new standard solutions
– Leave the bridge electrolyte to react on
the junctions for some hours until the
crusts have dissolved.
– Exchange the electrode
- -6
(1 x 10 ... 1 mol/l NO
3
NTERFERENCES
-
)
3
)
ba15362d04
NO 800
12/2021