Diagnostics and troubleshooting
CCS240/241
22
Hauser
Error
Possible cause
Remedy
Display value too low
Measuring chamber not
completely tightened
‣
Fully tighten measuring chamber or screw cap
Membrane soiled
‣
Clean membrane
Air bubble in front of membrane
‣
Release air bubble
Air bubble between cathode and
membrane
‣
Open measuring chamber, top up electrolyte,
tap
Input flow of medium too low
‣
Establish correct flow (→ 8)
Foreign oxidants interfering with
DPD reference measurement
‣
Examine medium, check chemicals
Use of organic chlorination agents
‣
Use agents according to DIN 19643 (water may
need to be replaced beforehand)
Display fluctuates
considerably
Hole in membrane
‣
Replace membrane cap
External voltage in medium
‣
Measure voltage between the PML pin and the
protective ground of the measuring device
(both AC and DC ranges). For values greater
than approx. 0.5 V, find and eliminate external
cause.
Temperature reading is too
low
Supply line to NTC temperature
sensor interrupted
1.
Perform line test (fixed cable: green/brown,
TOP68: green/yellow) and resistance
measurement (NTC).
2.
Where applicable, change sensor.
Temperature reading is too
high
Short-circuit in supply line to NTC
temperature sensor
1.
Perform line test (fixed cable: green/brown,
TOP68: green/yellow) and resistance
measurement (NTC).
2.
Where applicable, change sensor.