Oxygen Monitor SGM7 8 Operation
HB_SGM7_eng.docx 28
8.3.3 Calibration status
Chart 6: Messages calibration status
OK (1.5) last calibration OK (calibration value)
WAIT ! 5 calibration 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 7: Disturbances, causes and clearance
Disturbance Cause Clearance
Display off
SGM7 off Switch on SGM7
No current supply
Check current supply and cord
set
Equipment fuse tripped 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
Relatively high measuring
value although a low value
for the oxygen
concentration is expected
Gas flow too low Increase flow rate
Micro leaks in gas supply Check fittings
Measurement is dependent
on the flow rate (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)
Use carbon filter or check
existing filters for saturation
Warning: “WARM-UP”
Measuring cell has not reached
operating temperature yet
Wait for 5 minutes
Check temperature value on
display
Contact service if necessary
Fuse for sensor heater tripped
Switch off
Check again after switching on
Consult service if necessary
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
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