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Functions
9.12 Alarm current
9.12
Alarm current
This function is used to set the magnitude of the alarm current. The alarm current signals a
sensor fault or a hardware/firmware fault.
The intensity of the alarm current can be freely selected within the preset limits of the current
control range of 3.6 mA to 23 mA. The upper and lower limit of the linear control range can
also be freely selected within the preset limits of the current control range of 3.6 mA to 23
mA.
One example of this is shown in the following diagram. The specified accuracy values of the
output signal only apply to the corresponding nominal ranges.
①
②
③
④
⑤
⑥
⑦
Figure 9-1
9.13
Sensor calibration
9.13.1
Sensor calibration (one point)
This function allows the characteristic curve of the sensor that is connected to be shifted to
intersect the zero point. This allows calibration of the start of scale value of the input sensor.
This does not affect the measuring span.
50
Linear control range
Lower limit of the control range (default value = 3.80 mA)
Upper limit of the control range (default value = 20.5 mA)
Lower fault current value (default value = 3.6 mA)
Upper fault current value (default value = 22.8 mA)
Recommended setting range for lower fault current range and lower control range limit
Recommended setting range for upper fault current range and upper control range limit
Current limits with output signal 4 to 20 mA
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
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