Honeywell U2-1010S, User Manual

Page: 13 / 16

U2-S MODEL COMBINATION VIEWING HEAD AND SIGNAL PROCESSOR
13 32-00015—05
SAFETY MANUAL
U2-S Model Product Declaration
FIT FOR USE IN A LOW DEMAND SAFETY APPLICATION
Models:U2-1010S, U2-1012S, U2-1016S, U2-1018S, U2-1010S-PF, U2-1012S-PF, U2-1016S-PF, U2-1018S-PF
Definitions
Models SIL HFT SFF PFD
λ
S
λ
DD
λ
DU
U2-1010S/U2-1010S-PF 3 0 >99%
1.20 x10
-4
1.23x10
-5
3.34x10
-7
5.38x10
-9
U2-1012S/U2-1012S-PF 3 0 >99%
1.16x10
-4
1.64x10
-6
1.77x10
-9
5.32x10
-9
U2-1016S/U2-1016S-PF 3 0 >99%
1.15x10
-4
1.06x10
-5
1.74x10
-9
5.27x10
-9
U2-1018S/U2-1018S-PF 3 0 >99%
1.16x10
-4
1.16x10
-5
1.77x10
-9
5.32x10
-9
System Architecture 1oo1
MTTR 8 hours
Proof Test Interval 5 years
Fit for use in SIL 3 environment
Term Definition
Dangerous Failure Failure which has the potential to put the safety-related system in a hazardous state
Safety-Related System A system that implements the required safety functions required to achieve or maintain a safe state and is intended to
achieve on its own or with other systems the necessary safety integrity for the required safety functions.
Safety Function Defined function, which is performed by a safety-related system with the aim of achieving or maintaining a safe state for
the plant, in respect of a specified hazardous event.
Proof Test Periodic test performed to detect failures in a safety-related system so that, if necessary, the system can be restored to
an “as new” condition or as close as practical to this condition.
MTTR (Mean Time To Restoration) The average duration required for restoration of operations after a failure.
λ
sd
Rate of safe detectable failures per one billion hours.
For example, if
λ
sd
= 3000, then it is estimated that there will be about 3000 safe detectable failures during every one
billion hours of operation.
For
λ
sd
= 3000, this is about one safe detectable failure every 38 years.
λ
su
Rate of safe undetectable failures per one billion hours.
λ
dd
Rate of dangerous detectable failures per one billion hours.
λ
du
Rate of dangerous undetectable failures per one billion hours.
HFT Hardware Fault Tolerance
System Architecture Specific configuration of hardware and software elements in a system.
PFD
AVG
(Average Probability of
Failure on Demand)
Average Probability of Failure on Demand.
FIT (Failures in Time) A unit of measurement representing one failure per billion hours. 1,000,000,000 hours is approximately 114,155.25
years.