Hach Ultra POLYMETRON 9182, Operator'S Manual

Page: 66 / 92

Oxygen analyser (ppb) - 9182 -
7-10
b) Pollution of the electrolyte
!
Check the parts to screw (membrane, filling screw) and change the electrolyte.
c) Leak of electrolyte
!
Check the parts to screw (membrane, filling screw) and change the electrolyte.
d) Interferences, mainly with H
2
S
!
If the level of H
2
S (or other pollutant) is stable, take into account its concentration
to determine the O
2
concentation.
e) Error during calibration or incorrect calibration
!
Calibrate again to check the parameters. If the error is confirmed, check the
calibration current (too high, too low or unstable) and the concentration in the air.
Refer to the problems described above.
f) The temperature calibration has not been done
!
Check the temperature given by the transmitter and calibrate it (see page 6-2). If
you have chosen the manual compensation check the value is correct.
g) There are bubbles close to the cathod
!
Replenish the electrolyte holder and check there is no bubble at the bottom.
h) Flowrate too low (4 l/h minimum)
!
Increase the flowrate.
i) The sample temperature or pressure is out of the specifications
!
Change the probe location or modify the sample so that it meets the specifications.
j) Mud or particles on the golden cathod
!
Clean the golden cathod with an absorbant tissue and rinse the membrane.
k) The electrolyse potential is not equal to -0.85 V
!
Enter the correct value.
Other problems
a) The probe current is null
!
There is no electrolyte in the probe (leak).
b) The probe current is negative
!
Connexion problem to the anode circuit (loose contact).
!
AgBr deposit on the anode
c) The sample temperature corresponds to the specifications but there is an error on the
temperature
!
There may be a short-circuit on the temperature connection.