Functional safety
7.2 Device-specific safety instructions
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
41
7.2.4
Behavior in case of faults
Repairs
Defective devices should be sent in to the repair department with details of the fault and the
cause. When ordering replacement devices, please specify the serial number of the original
device. The serial number can be found on the rating plate.
The address of the responsible SIEMENS repair center, contacts, spare parts lists, etc. can
be found on the Internet.
7.2.5
Maintenance/Checking
Interval
We recommend that the functioning of the temperature transmitter is checked at regular
intervals of one year.
Checking the safety function
We recommend that:
● You check the status for warnings and alarms.
● Check the upper and lower alarm current value.
● Perform a 2-point calibration.
● You check the measuring accuracy that must be in the range of ± 2% for the safety
function. You check the measuring accuracy, for example, with a sensor calibration.
Checking safety
You should regularly check the safety function of the entire safety circuit in line with IEC
61508/61511. The testing intervals are determined during the calculation for each individual
safety circuit in a system (PFD
AVG
).
Summary of Contents for SITRANS T4200
Page 7: ...Table of contents SITRANS TH200 TH300 6 Operating Instructions 06 2010 A5E00393069 03 ...
Page 71: ...Service and maintenance SITRANS TH200 TH300 70 Operating Instructions 06 2010 A5E00393069 03 ...
Page 97: ...Glossary SITRANS TH200 TH300 96 Operating Instructions 06 2010 A5E00393069 03 ...
