Commissioning
6.2 Application examples
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 01/2014, A5E32221386-AB
55
6.2.3
Application with stillpipe
A stillpipe is recommended for products with a dK of less than 3, or if extremely turbulent or
vortex conditions exist. This mounting arrangement can also be used to provide optimum signal
conditions on foaming materials.
Note
•
Near Range (2.5.1.) (Blanking) will be set at the factory. Check the process connection
tag for specific values.
•
Suitable pipe diameters are 40 mm (1.5") to 100 mm (4").
•
The pipe diameter must be matched with the antenna size. Use the largest antenna size
that will fit the stillpipe/bypass pipe. See Dimension drawings (Page 177).
•
See Mounting on a Stillpipe or Bypass Pipe (Page 20) for installation guidelines.
This application is to obtain a level measurement and corresponding 4 to 20 mA output
proportional to the oil level in a fuel storage vessel.
●
Low Calibration Pt. is 5 m (16.4 ft) from the sensor reference point.
●
High Calibration Pt. is 0.5 m (1.64 ft) from the sensor reference point.
●
The stillpipe inside diameter is 50 mm (1.96").
●
The maximum rate of filling or emptying is about 0.1 m (4")/min.
①
Sensor reference point
⑤
5 m
②
High calibration point
⑥
50 mm I.D.
③
0.5 m
⑦
Low calibration point
④
Vent hole
