Siemens 7MB1420, Instruction Manual, Page: 28 / 74

9.2 Warnings and Error Messages
9.2.1 Warnings
The symbol precedes each warning.
The LED “warning” flashes on the control panel. The cause of the warning can be scanned using
“ENTER”. Further measurements are possible in this state. The analyzer may fail if the cause of the
warning is not eliminated.
Number
in display
71
72
73
74
75
76
77
78
79
Cause of warning
Pt100 temperature of physical section faulty
or outside the limits
The 2nd Pt100 temperature of the pump
(check measurement) is faulty or outside the
limits
Temperature of electronics section outside
the limits (0 to 80 ˚C) or sensor faulty
Fan faulty
Temperature deviation in pump comparison
(2nd Pt100)
The flow of control air is too high
The flow of control air is too low
Temperature of physical section outside the
limits (0 to 80 ˚C)
Hydrogen pressure outside the limits
Causes, notes
Filter increasingly contaminated,
pump diaphram leaks,
line increasingly blocked
The outlet restrictor or the gas
outlet is blocked
The limits defined in function 37
have been violated.
Hydrogen input pressure is too
high or too low; this warning may
also be produced if the limits are
too close and there are extreme
variations in atmospheric press-
ure.
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