Siemens 7MB1420, Instruction Manual, Page: 29 / 74

Number
in display
80
81
82
83
84
85
86
87
88
Cause of warning
Sample gas pressure outside the limits
Flame out
Difference between last and current zero cali-
brations >6 %
Output current 1 used for internal value
Measured value exceeds full-scale value of
largest measuring range
Stripper (option) faulty
Incorrect device configuration
(only in “autocal” mode)
Less than four setpoints have been entered
(only in “autocal” mode)
Incorrect measured value
Causes, notes
The limits defined in function 38
have been violated.
Combustion air pressure (con-
trol air) is too high or too low;
sample gas inlet faulty (pump,
filter, lines); this warning may al-
so be produced if the limits are
too close and there are extreme
variations in atmospheric pres-
sure
The exact value for new/old can
be scanned using function 96
See function 62
Red efine fu ll-s c ale value
(function 12)
Inform service
Upon changeover from total to
single calibration only the mea-
suring ranges with set values will
be calibrated
Rec alib r at e d evic e using
function(s) 5 and/or 8
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