89750147 Crouzet USA, 89750147 Datasheet - Page 293

• Manufacturer Part Number: 89750147
• Description: STAINLESS SLEEVE-MILL TEMP PRB
• Manufacturer: Crouzet USA

Specifications of 89750147

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Sommaire général
Estimation of the risk in the event of a fault and selection of a suitable category
Safety category for control systems (according to EN 954-1)
Starting point for estimating the risk for the part of the
control system relating to safety.
S
F
P
B. 1-4 : Categories for the parts of the control system relating to
Categories
B
1
2
3
4
Seriousness of injury
S1 Slight injury
S2 Serious, irreversible injury to one or more person(s)
or death
Frequency and duration of exposure
F1 Rare to quite frequent
F2 Frequent to continuous
Possibility of avoiding the dangerous phenomenon
P1 Possible under certain conditions
P2 Rarely possible
safety
The part of the machine control system
relating to safety and/or protective devices, as well
as its components, must be designed, selected,
assembled and combined using the most
advanced methods in order to be able to cope with
expected influences.
The requirements of B apply.
Proven components and safety principles must be
used.
The requirements of B and the use of proven
safety principles apply.
The safety function must be checked at suitable
intervals by the machine control system.
Note : suitable times will depend on the application
and the type of machine.
The control system must be designed so that :
a) a single fault in control does not cause the loss
of the safety function.
b) if reasonably possible, the single fault must be
detected by suitable measures using the most
advanced technology.
The requirements of B and the use of proven
safety principles apply.
The control system must be designed so that :
a) a single fault in control does not cause the loss
of the safety function, and
b) if possible, the single fault should be detected,
by the next call to the safety function, or
c) if b) is not possible, an accumulation of faults
should not cause the loss of the safety function.
Summary of requirements
- If a fault occurs, it may cause
the loss of the safety function.
- Certain faults are not detected.
As described for category B, but with greater
reliability in relation to the safety of the safety
function.
- The appearance of a fault may cause the loss of
the safety function between checking intervals.
- the fault is detected by the check.
- When there is a single fault, the safety function
continues to operate.
- Certain faults are detected, but not all.
- The accumulation of non-detected faults may lead
to the loss of the safety function.
- When faults appear, the safety function
continues to operate.
- Faults will be detected in time to avoid the loss of
the safety function.
S1
S2
System behaviour
F1
F2
Normal category for the level of risk
Go to the next highest category if the solution is
standardised
Go to the next lowest category if the solution is
standardised
P2
P1
P1
P2
B 1
Categories
components
and safety principles
By structure
By selecting
Main basis of
(according to EN 954-1)
2
safety
3
4
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