Level measurement

132 Continuous level measurement in bulk solids

4. Instrument selection within the measuring principle

Electromechanical level system

Required application data • Measuring range • Consider ceiling load by max. tensile force at the point of measurement • Product grain size

Application limits for the electromechanical level system • Temperature up to –20°C/–4°F • Temperature up to +230°C/+446°F • Pressure up to 3bar/43.5psi • (optional 90m/295ft) •

• Pressure and temperature • Resistance requirements • Nozzle height

Recommendation concerning the selection The following aspects should be observed in the selection of the sensing weight: • The sensing weight may neither sink into the product nor slide off the angled surface during the measuring operation • The sensing weight must be able to withstand the chemical properties of the product and the temperature prevailing in the bunker/silo

C

Model

Sensing weight

Application

Temperature

Materials

FMM50 Normal weight, cylindrical with removable spike

Complete temperature range

Steel, stainless steel

ore or stones and granulates Very light and loose bulk

FMM50 Umbrella weight

Max. 150°C/302°F Steel or

stainless steel with Polyester

FMM50 Bag weight

Bunkers with mills downstream

Max. 150°C/302°F Bag made of Polyester, stainless steel

FMM50 Cage weight

Fine-grained bulk solids

Complete temperature range

Steel, stainless steel

FMM50 Oval float FMM50 Bell weight

Granulates

Max. 60°C/140°F Rigid PVC

Light and loose bulk solids

Complete temperature range

Stainless steel

FMM20 Normal weight, cylindrical with removable spike FMM20 Normal weight, cylindrical

Granulates and compacted bulk solids Granulates and compacted bulk solids Very light and loose bulk

Max. 150°C/302°F Steel,

stainless steel

Max. 70°C/158°F Plastics

FMM20 Umbrella weight

Max. 150°C/302°F Steel or

stainless steel with Polyester

FMM20 Bag weight

Bunkers with mills downstream

Max. 150°C/302°F Polyester,

stainless steel