SICK DUSTHUNTER T - Page 186

Clearing Malfunctions
GMS800 · Operating Instructions · 8013025 V1.2 · © SICK MAIHAK GmbH 59
Subject to change without notice
9.3 If measured values are obviously incorrect …
9.4 If measured values are unstable for no apparent reason …
Possible causes Information Notes for service
GMS800 not ready for opera-
tion.
b Check operational readiness
( → p. 36, §5.3).
–
GMS800 not measuring the
sample gas.
b Check sample gas path and all
valves (e.g. switching from test gas to
sample gas).
b Make sure valves are function-
ing correctly, disassemble if
necessary.
Sample gas path not switched
correctly.
GMS800 not correctly
adjusted.
b Check prerequisites for correct
adjustment:
– Correct test gases used?
– Nominal values set correctly?
b Then run an adjustment.
b Check test gases used critically
(nominal values, manufacturing
tolerance, state).
Measuring parameter settings
not suitable for the applica-
tion.
b Check corresponding settings (e.g.
damping). try a different setting as
test.
–
Sample gas pressure inside
the GMS800 too high.
b Ensure sample gas pressure in the
GMS800 is not greater than 20 kPa
(= 200 mbar) against atmospheric
pressure.
The gas pressure can influence
measured values in most of the
measuring principles used.
Sample gas path not gas-
tight.
b Visually inspect the installation.
b When a defect is suspected: Inform
the manufacturer's Customer Ser-
vice or trained skilled persons.
Carry out a leak tightness check.
When only observed on one
measured value output: the
load is too high.
b Make sure that the total internal
resistance of the connected devices
is not larger than 500 Ω .
b Measure including feed line.
Analyzer module is contami-
nated.
b Contact manufacturer’s Customer
Service or trained skilled persons.
b Inspect the measuring cell/
cuvette.
b Clean or replace if necessary.
With computation of an ana-
log input (option): External
analog signal is erroneous or
has failed.
b Check external equipment that deliv-
ers the analog signal for cross-sensi-
tivity compensation.
– Connection interrupted?
– Problem with external measure-
ment?
– External analyzer not adjusted?
Possible causes Information Notes for service
Strong pressure fluctuations
at the sample gas outlet.
b Install separate exhaust gas line for
the GMS800 .
–
Strong mechanical vibrations.
b Check ambient conditions where the
GMS800 is installed.
–