Oxygen Monitor SGM7.2.4/7.2.6 8 Operation
30
8.3.3
Calibration status
Chart 8:
Messages calibration status
OK (1.5)
last calibration OK (calibration value)
WAIT ! 5
calibration is running
BREAK
cancelled by pressing key
TIME OUT
stability not reached within 60sec
OUT OF RANGE
range exceeded
FAILED
instrumental error
START
start calibration
8.4
Fault clearance
Chart 9:
Disturbances - causes and clearance
Disturbance
Cause
Clearance
Display off
SGM7.2.4 off
switch on SGM7.2.4
No current supply
Check current supply and cord line
Equipment fuse triggered
Change equipment fuse
Warning:
FLOW <<< (Flow too low)
Gas supply blocked, too long for
chosen cross section or leaky
Check gas supply
Remove blockages
Establish tightness
Pump defective
Replacement by manufacturer
Change filter!
Maintenance interval zero
Change carbon filter, reset interval
Relatively high measuring
value, although a low value
for the oxygen concentration
is expected
Gas flow too low
Increase flow rate
Micro leaks in the gas supply
Check fittings
Measurement is dependent
on the throughput (the
smaller the flow, the higher
the value or vice versa)
Leaks in the measuring gas supply Check gas supply and fittings
Measuring value is
significantly lower than
expected
Reacting components (at high
temperatures with oxygen) in the
measuring gas (e.g. hydrocarbons)
Check activated carbon filter for
saturation
Warning: “WARM-UP”
Measuring cell has not reached
operating temperature yet
Wait for 5 minutes
Check current temperature on
display
Fuse for sensor heater triggered
Switch off, check after switching on
if fault appears again – in this case
consult service
Heater or regulator defective
Consult service
Warning: ERROR
THERMOCOP.
Thermocouple defective
Consult service
Warning: SELF TEST
FAILED (system error)
Error program- or data memory
Consult service