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Commissioning
6.3 Application examples
SITRANS LR250 with FOUNDATION FIELDBUS
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Operating Instructions, 09/2021, A5E32221411-AH
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 185).
• See Mounting on a Stillpipe or Bypass Pipe (Page 29) 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
Parameter
type
Parameter No./Name Options/Values Function
Quick Start
Wizard param-
eters
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Material LIQUID LOW DK