Siemens sitrans tr200, Operating Instructions Manual

Page: 42 / 78

Functions
8.12 Alarm current
SITRANS TR200/TR300
42
Operating Instructions, 04/2007, A5E01071992-01
8.12 Alarm current
You can use this function to set the value of the alarm current. The alarm current signals a
sensor fault or a hardware/firmware fault.
The value of the alarm current can be freely selected within the preset limits of the current
control range, 3.6mA to 23mA. The upper and lower limits of the linear control range can
also be freely selected within the preset limits of the current control range, 3.6mA to 23mA.
The following diagram shows an example. The specified accuracy values of the output signal
only apply to the corresponding nominal ranges.
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Figure 8-1 Current limits for output signal 4 to 20mA
➀ Linear control range
➁ Lower limit of the control range (default value = 3.84 mA)
➂ Upper limit of the control range (default value = 20.5 mA)
➃ Lower fault current value (default value = 3.6 mA)
➄ Upper fault current value (default value = 22.8 mA)
➅ Recommended setting range for lower fault current range and lower control range limit
➆ Recommended setting range for upper fault current range and upper control range limit