Siemens FST020, Function Manual, Page: 37 / 194

Setup
3.1 Sensor settings
FST020 Function manual
Function Manual, 09/2017, A5E42949526-AA
35
Related
Path Setup → Sensor settings → Multipoint calibration → Multipoint calibration table → Calibration
value 1 - 20
3.1.10 Flow direction
Description
The calibrated flow direction is indicated by the arrow on the sensor. If the system requires
installation of the sensor with the flow running in the opposite direction, the Flow Direction
parameter must be changed from Positive to Negative to totalize correctly. The sensitivity
and the accuracy of the sensor do not change with reverse flow.
Define positive and negative flow direction. Default positive flow direction is indicated by the
arrow on the sensor.
Setting Negative; Positive
Default Positive
Related
Path Setup → Sensor settings → Flow direction
3.1.11 Miscellaneous
3.1.11.1 Preamplifier Setting
Description
Preamplifier settings
Access level: Expert user only
Auto (default): Will automatically turn on the pre-amplifier if the sensor type is clamp-on.
Off: Turns off the pre-amplifier regardless of the sensor type (inline or clamp-on).
On: Turns on the pre-amplifier regardless of the sensor type (inline or clamp-on).
Half transmit amplitude: Reduces the transmit signal from the default ±10 volts to ±5 volts
and turns off the pre-amplifier. This may be necessary for the smaller SONO sensors which
can saturate the amplifiers even with the pre-amp off.
Setting Auto; Off; On; Half transmit amplitude
Default Auto