Siemens SITRANS P - Page 7

9.3.5.1 Introduction ..........................................................................................................................149
9.3.5.2 "Custom units" parameter ....................................................................................................150
9.3.5.3 Set customized characteristic curve.....................................................................................150
9.3.6 Sensor calibration ................................................................................................................151
9.3.7 Digital-to-analog converter trim (DAC trim) ..........................................................................152
9.3.8 Diagnostics functions ...........................................................................................................154
9.3.8.1 Limit monitoring and event counter ......................................................................................154
9.3.8.2 Trend log ..............................................................................................................................157
9.3.8.3 Operating hours counter ......................................................................................................158
10 Functional Safety......................................................................................................................................159
10.1 Safety concept .....................................................................................................................159
10.1.1 Random and systematic errors ............................................................................................159
10.1.2 SIL-compliant product version..............................................................................................159
10.1.3 Safety function .....................................................................................................................160
10.1.3.1 Device states........................................................................................................................162
10.1.3.2 Safety characteristic values .................................................................................................162
10.1.4 Operating modes of the device ............................................................................................163
10.1.5 Device mode ........................................................................................................................163
10.1.5.1 Validation .............................................................................................................................164
10.1.5.2 Safety-related parameters....................................................................................................165
10.1.5.3 Device mode "Functional Safety enabled" ...........................................................................165
10.2 Enabling Functional Safety ..................................................................................................166
10.2.1 Enabling Functional Safety over device with display ...........................................................167
10.2.2 Enabling Functional Safety over remote operation ..............................................................170
10.3 Acknowledging safety-related errors....................................................................................174
10.3.1 "Safety critical error" device mode .......................................................................................174
10.3.2 Acknowledging safety-related errors via remote operation ..................................................175
10.4 Disabling Functional Safety over device with display...........................................................176
10.5 Disabling Functional Safety over remote operation .............................................................177
10.6 Proof test..............................................................................................................................178
10.6.1 Intervals and rules for proof test...........................................................................................178
10.6.2 Documenting a proof test .....................................................................................................179
10.7 Repair and service ...............................................................................................................179
11 Service and maintenance .........................................................................................................................181
11.1 Basic safety instructions.......................................................................................................181
11.2 Cleaning ...............................................................................................................................182
11.2.1 Cleaning the enclosure ........................................................................................................182
11.2.2 Servicing the remote seal measuring system ......................................................................182
11.3 Maintenance and repair work...............................................................................................182
11.3.1 Checking the seals...............................................................................................................184
11.3.2 Check cable glands..............................................................................................................185
11.3.3 Replacing spare parts ..........................................................................................................185
11.3.3.1 Replacing electrical connections and cable entries .............................................................185
11.3.3.2 Replacing the display ...........................................................................................................185
11.3.3.3 Replacing the termination board ..........................................................................................187
11.4 Return procedure .................................................................................................................188
Table of contents
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC 7