Tecnosens NCL C10, Assembly Instructions Manual

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5. Troubleshooting and Spare Parts
24
Problem detected Possible cause Solution
Deformed or
broken membrane
Extraction or insertion of
the probe inside the
probe holder without
having opened the bleed
valve
Membrane cap replacement. See spare parts
Incorrect assembly or
disassembly of the cap
Membrane cap replacement. See spare parts
Operating pressure
greater than 1 bar
Install a pressure regulator upstream of the
probe holder or move the sampling point to a
system position where the pressures are
compatible with the operating conditions of
the probe.
Presence of solid
abrasive particles in the
water flow
Install a filter upstream of the probe holder to
prevent particles from coming into contact
with the probe. Membrane cap replacement.
See spare parts
Presence of
bubbles on the
membrane surface
Flow rate and pressure of
the sample water outside
the operating range (30 ÷
60 l/h and 0.3 ÷ 0.5 bar)
If the pressures are greater than those
indicated, insert a valve to adjust the pressure
upstream of the probe holder. Replace the
membrane cap. See spare parts. If the
pressures are lower than those required, try to
throttle the system with a valve downstream
of the probe holder.
Measurement
deviation from the
DPD value
Probe installed for too
short a time. Wait another time, repeat the calibration after
a few hours.
Damaged membrane
(deformed, broken, dirty,
etc.)
Replace the damaged membrane cap and
restore the gel electrolyte. See spare parts.
Presence of chemicals
that can interfere with
the measurement Evaluate the presence of interferents present
in the measurement water and remove them.
If necessary, contact the supplier.
Reference electrode
touched with the fingers
before fitting the cap
with the gel electrolyte.
Return the probe to the supplier for
regeneration
Contaminated or
depleted gel
electrolyte
Tubular gasket deformed
to the point of no longer
guaranteeing the tightest
seal on the cap holes.
Replace the tubular gasket. See spare parts.