For RTD and linear resistance input sensors, cable resistances of up to 50 W per wire can be
compensated if 3- or 4-wire connection is configured.
For thermocouple sensors, cold junction temperature errors can be compensated, either by an
internally mounted temperature sensor, or by an accessory connector with a built-in temperature
sensor. The selection of CJC measurement must be done and verified by the end user.
6 Functional specification of the non-safety functions
The status relay (terminal 33 and 34), error signal on power rail (terminal 91) and LED outputs
are not suitable for use in any Safety Instrumented Function.
7 Safety parameters
RTD, TC, LinR and Potentiometer input, Current output
Probability of dangerous Failure per Hour (PFH) 4.30E-08
Note
1
Probability of failure on demand (PFD) -
1 year proof test interval
2.82E-04
Proof test interval (10% of loop PFD) 4 years
Safe Failure Fraction 93%
RTD, TC, LinR and Potentiometer input, Relay output
Probability of dangerous Failure per Hour (PFH) 6.20E-08
Note
1
Probability of failure on demand (PFD) -
1 year proof test interval
4.03E-04
Proof test interval (10% of loop PFD) 3 years
Safe Failure Fraction 90%
Voltage input, Current output
Probability of dangerous Failure per Hour (PFH) 5.60E-08
Note
1
Probability of failure on demand (PFD) -
1 year proof test interval
3.66E-04
Proof test interval (10% of loop PFD) 3 years
Safe Failure Fraction 93%
Voltage input, Relay output
Probability of dangerous Failure per Hour (PFH) 7.60E-08
Note
1
Probability of failure on demand (PFD) -
1 year proof test interval
4.89E-04
Proof test interval (10% of loop PFD) 2 years
Safe Failure Fraction 91%
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