Level measurement

66 Continuous level measurement in liquids

4. Instrument selection within the measuring principle

Installation instructions radar – stilling well

Weather protection cover • Always recommended for outside installation to avoid strong temperature changes of electronics Optimum horn size • 95mm/3.7") use the next larger antenna and adapt it mechanically (inner

Ball valve (if available) • Measurements through an open ball valve with full passage are possible

Measuring range • Measurement is possible up to the tip of the antenna, on principle, however, the end of the measuring range should not be closer than 50mm/2" to the tip of the antenna because of corrosion and build-up formation

Slots/holes • As few holes/slots as possible • Slot width or hole diameter max. 1 /

C

10 of pipe diameter

• Deburred • Length and number do not affect the measurement • Slots/holes 180° offset (not 90°)

Recommendations for stilling wells • Metallic (without enamel coating, plastic upon request) • Constant diameter • Welding seam as even as possible and placed in the axis of the slots • • Do not weld through the wall of the pipe, the inside of the pipe must remain smooth • In transitions, caused for example by ball valves or joining of individual pipe pieces, gaps of max. 1mm/0.04" are permitted