Siemens SITRANS T Series - Advanced Functions

Functional Safety
The following additional functionality is available for devices with Functional Safety:
Functional Safety SIMATIC PDM Device with display
(local operation)
Enable and disable Functional Safety Menu command "Device >
Functional Safety"
Functional Safety Manual (Page 23)
9.1.2 Advanced functions
Description
Function Description
Di󹪜erence The analog output signal is proportional to the di󹪜erence between the measured
values of sensors 1 and 2.
Average value measurement The analog output signal is proportional to the average value of the measured values
of sensors 1 and 2.
Max. The analog output signal is proportional to the sensor with the highest value.
Min. The analog output signal is proportional to the sensor with the lowest value.
Sensor drift When the di󹪜erence of the measured values between sensor 1 and sensor 2 exceeds
a de󹪝ned limit, a sensor drift warning or sensor drift error is displayed.
Redundancy (hot backup) The analog output signal is proportional to the primary sensor (sensor 1 or sensor 2)
as long as no error is detected and the input is within the user-de󹪝ned limit. If an error
is detected at the primary sensor or the sensor 1 value is outside the user-speci󹪝c
limit, the analog output signal becomes proportional to the redundant sensor (sen‐
sor 1 or sensor 2) and a warning is generated.
User-speci󹪝c linearization - Callendar-
Van Dusen coe󹪟cients
Supports the change of the Callendar-Van Dusen coe󹪟cients.
Custom type - Linearization table Supports the input of up to 60 breakpoints.
Custom type - Spline curve Supports the input of up to 40 breakpoints.
Operating hours counter - Transmitter
electronics
Recording of the internal transmitter temperatures during operation, recording time
in each of 9 󹪝xed sub-temperature ranges.
Operating hours counter - Sensors Recording of the sensor measuring temperatures during operation, recording time in
each of 9 󹪝xed sub-temperature ranges.
The subranges are speci󹪝ed separately for each sensor type.
Peak values - Transmitter electronics Recording of the minimum and maximum internal transmitter temperature across
the entire device lifetime.
Peak values - Sensors The recording of the min./max. measured values of the sensor(s) is saved. When the
measurement con󹪝guration is changed, the values are reset.
Parameter assignment
9.1 Overview of parameters and functions
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
136 Operating Instructions, 05/2020, A5E41864807-AB