Siemens FUS1010, Руководство по эксплуатации, Страница: 101 / 298

Functions
7.1 UniMass Table
FUS1010 IP65 NEMA 4X & IP66 NEMA 7
100
Operating Instructions, 01/2013, A5E02951520-AC
An example of the format for a four point Constant Temp data file is as follows:
MTABLE 1 4
1510.0 30.0 1.1 2.7
1520.0 40.0 1.5 3.4
1530.0 50.0 1.9 5.5
1540.0 60.0 2.2 6.8
MTABLE is the special keyword indicating that UniMass data follows.
1 stands for the channel number where the data is being installed and 4 indicates the
number of lines (data points).
Note
The last number must match the number of lines or else the table will not be formatted
correctly.
Each line corresponds to a point. Sonic velocity is first, followed by temperature (these are
the input variables). Then specific gravity is second followed by viscosity (these are the
output variables). Do not use commas between the items, only single spaces. A carriage
return is expected after each line, EXCEPT for the last line.
For example, line 1 of MTABLE 1 4 (
1510.0 30.0 1.1 2.7) shown above is read as follows:
1510.0 (Sonic Velocity) 30.0 (Temperature) 1.1 (Specific Gravity) 2.7 (Viscosity)
You may save this file by using a name suggested by the liquid in question. Once the file is
saved use HyperTerminal to send it as a simple text file to the PC serial port of the flow
meter. It is suggested that a moderate data rate be used (e.g. 1200 baud) for this function
since the flow meter is fairly busy computing and interpolating during the installation of the
table.
[Changing Temp & Vs] - Press the <Right Arrow> to access.
The [Changing Temp & Vs] lookup table must be serially loaded using the HyperTerminal
[Send Text File] command. This table can be generated using a utility provided by Siemens,
which converts the Vs and temperature data into a uniform 10x10 grid array and formats it
appropriately for serial upload.
Below is a sample input data file for gasoline and diesel fuel that was derived from sound
velocity data obtained using a flow meter installed on a fuel pipeline. The task of obtaining
sound velocity, as a function of density and temperature, can also be performed in a
laboratory environment under conditions of controlled temperature and liquid properties.