Faults And Repair; Fault List - Pentair HAFFMANS c-DGM Instruction Manual

9.

Faults and repair

9.1

Fault list

Problem
Too many bubbles in the
measurement chamber
during sampling
Nothing appears on the
display when you press an
arbitrary button
The pressure or
temperature measurement
indicates HHH or LLL
The CO value seems
2
wrong.
Error message
Battery voltage too low
Measurement aborted.
Charging voltage too high
Check adapter
Electrolysis current too high
Measurement aborted
No electrolysis current
measured
Measurement aborted
Measurements cannot be
performed while the battery
is being charged.
Questionable calibration
Old calibration restored
c-DGM/i-DGM
Cause
(a) defective O-ring(s) on
the plunger
The battery is discharged
The measurement is out of
range. LLL indicates the
value is too low. HHH
indicates that the value is
too high.
Deviation of the pressure
sensor
Cause
Batteries are discharged
The power supply is
supplying an incorrect
voltage level
The conductivity of the
liquid in the measurement
chamber is too high
There is no liquid in the
measurement chamber
For safety reasons, you
cannot carry out any CO
measurements whilst the
battery pack is being
charged.
The measured difference in
calibration pressure is too
low
*The difference between
the measured oxygen
signal at the zero point and
at the high calibration point
is too small.
, &&D E^ 'D 'D
Solution
Remove the plunger and replace the
defective O-rings.
Recharge the battery pack.
Pressure sensor:
The pressure calibration is incorrect.
Calibrate the pressure sensor (see
chapter 7).
Temperature sensor:
The electrical connection to the main
electronics has been interrupted. Contact
your local representative or Haffmans
B.V.
Calibrate the pressure sensor (see
chapter 7).
Solution
Charge the batteries.
Check the power supply.
Flush the measurement chamber with
water to remove possible traces of
cleaning agent.
Fill the DGM with a sample and try again.
First charge the battery and then
disconnect the power supply.
2
Check the calibration device to determine
whether the correct pressures were set
during calibration.
* Check if gases with different O
concentrations
are being used during calibration. Use a
calibration gas with a higher O
2
content.
2
Page 57 of 78