Table of Contents
Advertisement
Temperature Converter with Trip Values KF**-GUT-(Ex)1.D
Overview
Temperature conditions and testing times
The PFD values (PFD = Probability of Failure on Demand) of KF**-GUT-(Ex)1.D equipment lie within
the range specified for SIL2 for the testing times given in the report. The PFD values were calculated
based on the assumption of a mean ambient temperature of 40 °C. At a temperature of 60 °C the failure
rate must be multiplied by a factor of 2.5. In practice, this means a correspondingly reduced testing
interval. For mean temperatures between 40 °C ... 60 °C the factor can be adjusted linearly.
The test interval can be extended by connecting the two relay outputs. Here, the parameters for both
relay outputs must be set to the same values. For details, see the SIL report.
Basically, for safe opening you should connect two NC contacts in series, and for safe closing connect
two NO contacts in parallel.
5.2
Safe output states
Relay outputs
In the safe state, the relay is deactivated, that is, the working contact is open.
Current output
The safe state here is the indication of an error state via output of the signal level specified for this in
NE43.
5.3
Configuration
The configuration of the device must be performed exclusively using the control panel. Configuration
through the device interface is not permitted for safety-relevant applications.
The functions set must be checked using suitable testing after configuration is complete.
Example 1: The power output is configured with a start value of 50 °C and a final value of 500 °C at
4 mA ... 20 mA (NE43) output characteristic, and the input is configured for a Pt100 type sensor.
By applying the corresponding input values (RTD simulator, decade resistor), it can be tested whether
the output current at 50 °C is 4 mA and at 500 °C is 20 mA. The output current can be measured using,
e. g., a measurement device (DMM).
8
DOWNLOADED FROM WWW.SCATTS.CO.UK
DOWNLOADED FROM WWW.SCATTS.CO.UK
Advertisement
Table of Contents
