Project: Ruhrgas AG
Gas Storage |
Technical
Data
Datascan Network
 | 4 X 7010 |
| 3 X 7026 |
| 3 X 7027 |
|
|
|
| CONFIGURATION |
|
Signal Monitored: |
|
| Channel |
Input |
Output |
Total |
|
|
| Analog |
72 |
|
72 |
|
| gas pressures through various 4-20 mA sensors |
|
|
| Digital |
|
|
|
|
|
|
| Total |
72 |
|
72 |
|
|
|
| |
|
|
|
|
|
|
| Computer Platform
| Standard PC |
|
|
|
| Software: Labtech
Notebook |
Overview of
application
Ruhrgas is the bigger supplier for natural gas
in Germany. Germany resources of natural gas are almost used up or
too expensive to exploit. Germany has to import most its gas.
However large amounts of gas are stored in natural sites, where the
gas resources have been completely used up. Gas is pumped into the
porous stone, which previously held the natural gas, and extracted
when necessary.
Datascan is used to monitor the gas pressure
at one of the storage sites. Three 7010 processors are distributed
on the site, the total length of the unshielded twisted pair network
cable is 2.6 km. One 7026 is attached to each 701 0 processor. A
fourth network node is the monitoring hall, where approximately 40
signals from different 4-20 rnA transducers are acquired. The data
acquisition is performed on a 486 Compaq PC, at a rate of once every
30minutes. The software used is Labtech Notebook for Windows. The
system is purely a data collection and
visualisation
system.
The decisive factors in favour of the Datascan system
were:
| The RS-485 networking ability permitting the use of
existing telephone cables |
| the level of isolation on the analog inputs |
| the 16 bit resolution which gave the user high
accuracy's and repeatability |
| the rugged din rail mounted
design. |
|
