Application With Stillpipe - Siemens SITRANS LR250 Operating Instructions Manual

Commissioning
6.3 Application examples
6.3.3

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 221).
• See Mounting on a Stillpipe or Bypass Pipe (Page 32) 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
②
③
④
76
Sensor reference point
High calibration point
0.5 m
Vent hole
⑤
5 m
⑥ 50 mm I.D.
⑦
Low calibration point
SITRANS LR250 (FOUNDATION FIELDBUS)
Operating Instructions, 08/2014, A5E32221411-AC