Signal Processing - Endress+Hauser PROline Prosonic Flow 93 Function Manual

3 Transducer Blocks (transmission blocks)


102
3.2

Signal processing

The Transducer Blocks TRANSDUCER_CH1 (flow channel 1, base index 1200) and
TRANSDUCER_CH2 (flow channel 2, base index 1300) receive several signal variables
as input values from the sensor, (sound velocity, flow velocity). Other process variables
are derived from these signal variables, (see Section 3.3 Block output values). The input
signals are prepared for measuring via the amplifier.
The "Simulation - Value Measurand" parameter (see Page 128) allows you to specify a
simulation value for the Transducer Block TRANSDUCER_CH1 (base index 1200) or
TRANSDUCER_CH2 (base index 1300) in order to test assigned parameters in the
device and subsequent function blocks.
A low flow cut off allows you to hide measurement inaccuracies in the low flow range.
The "Low Flow Cut Off - On Value" parameter (see Page 114) allows you to define a limit
value.
If the measured flow value undershoots this limit value, the output value of "0" is output.
In addition, the "System Param. - Positive Zero Return" parameter (see Page 113) allows
you to switch the measured value to "0". This is necessary when the piping system is
being cleaned, for example.
The Transducer Blocks TRANSDUCER_CH1 (flow channel 1, base index 1200) and
TRANSDUCER_CH2 (flow channel 2, base index 1300) make the following process
variables available to the downstream function blocks.
• Volume flow channel 1 and volume flow channel 2
• Sound velocity channel 1 and sound velocity channel 2
• Flow velocity channel 1 and flow velocity channel 2
• Signal strength channel 1 and signal strength channel 2
If the device operates in two-channel mode, the following calculated process variables
are also made available:
• Average volume flow
• Volume flow sum
• Volume flow difference
• Average sound velocity
• Average flow velocity
A process variable (e.g. volume flow channel 1, etc.) can be assigned to each individual
totalizer in the Transducer Block TRANSDUCER_TOT (totalizer, base index 1550). The
totalizers are also configured here. In this way, for example, all totalizers can be reset
simultaneously by means of the "Totalizer Handling - Reset All" parameter.
You will find an overview of all the block output values on Page 103.
The Transducer Block TRANSDUCER_DIAG (diagnosis, base index 1600) contains all
the parameters necessary for the diagnosis and maintenance of the device. For
example, the "Diagnosis - Actual System Condition" parameter (see Page 156) displays
the current system status or detailed information on the cause of an error if an error
occurs.
If the device is equipped with a local display, various display parameters, such as the
UI language, contrast etc., can be configured via the Transducer Block
TRANSDUCER_DISP (display, base index 1500).
Note!
The Transducer Blocks TRANSDUCER_DIAG (diagnosis, base index 1600) and
TRANSDUCER_DISP (display, base index 1500) do not have any output values, i.e. they
only have an effect on the device itself.
The most important functions and parameters of the Transducer Block are listed below.
An overview of all the parameters available is provided from Page 106 onwards.
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