Endress+Hauser Micropilot FMR60 - Page 10

Micropilot FMR60/62/67
10 Endress+Hauser
Safety related error Explanation Implications for the
safety related output
signal
Implications for the
measuring uncertainty
(Position, see figure
→  10)
No device error Safe:
No error
None 1 Is within the
specification (see TI,
BA, ...)
λ
SD
Safe detected:
Safe failure which can be
detected
Causes the output signal
to signal the failsafe mode
(see, →  11)
3 No implications
λ
SU
Safe undetected:
Safe failure which cannot
be detected
Is within the defined error
range
2 May be beyond the
specification
λ
DD
Dangerous detected:
Dangerous failure which
can be detected
(Diagnostic within the
device)
Causes the output signal
to signal the failsafe mode
(see, →  11)
3 No implications
λ
DU
Dangerous undetected:
Dangerous failure which
cannot be detected
May be outside the
defined error range
4 May be outside the
defined error range
I [mA]
B
C
A
t
1
2
4
3
3
A0025264
A HI-Alarm ≥21 mA
B Error range ±2 %
C LO-Alarm ≤3.6 mA
Dangerous undetected failures in this scenario
An incorrect output signal that deviates from the real measured value by more than 2 %, but is still
in the range of 4 to 20 mA, is considered a dangerous, undetected failure.