Short-Circuit Monitoring; Line Compensation; Type Of Characteristic Curve (Rising Or Falling) - Siemens SITRANS TH100 Operating Instructions Manual

Functions

8.5 Type of characteristic curve (rising or falling)

8.3

Short-circuit monitoring

The sensor connected to the transmitter is permanently monitored for short-circuit.
A sensor short-circuit is present if the measured resistance of the connected Pt100 becomes
less than 10 Ohm.
The programmed fault current, 3.6 to 23 mA, is output in the event of a sensor short circuit.
Monitoring of the sensor short-circuit cannot be switched off.
The short-circuit limit is fixed at 10 Ohm and cannot be changed.
8.4

Line compensation

Line compensation is necessary when using the Pt100 with a 2-wire input.
The trimming is performed by numerical preset of the measured line resistance. The line
resistance is the combined total of sending and return conductors.
8.5 Type of characteristic curve (rising or falling)
The type of the characteristic curve at the 4 to 20 mA analog output can be selected (rising or
falling). The characteristic curve type is defined as follows by setting the parameters for the
start of scale value and full scale value:
● Rising characteristic: Full scale value is greater than start of scale value.
● Falling characteristic: Full scale value is less than start of scale value.
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Operating Instructions, 09/2013, A5E00331168-04
SITRANS TH100