LD60/LD61 Displacement level indicator
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Level switch Vibrating fork system Level Switch for Solids Fork System Working pressure manufacturing according to PED 97/23/CE (Lloyd's Register Certificate N° 031) The LD60/LD61 is a level switch using the vibrating fork It is a robust and compact switch for the measurement of liquids and solids (only LD60). Some typical applications are: • Pump control • Tanks open and pressurized • Tanks with agitation • Open channel and pipe empty/full detection • Distillation columns • Chemical dosing tanks • Not affected by temperatures or pressure changes • Suitable for liquids with viscosity up to 10,000 cSt. • Detection of solids (powders) only LD60 • Corrosion resistant materials • Maintenance free • Integral electronics • Selection of normally open or normally closed • LED status indication (bicolor) • Functions test with external magnet Thread: BSP/NPT Flange: DIN/ANSI Sanitary: Clamp, Naue, DIN 11851 Wide range of sensor lenghts

The Series LD60/LD61 is a level switch using the vibrating fork technique. An electronically controlled piezo-electric sys- tem vibrates the fork at its natural frequency. The change of frecuency in the presence of a liquid, or of the amplitude in the presence of a solid, is detected and controls the change in the state of the output switch. Technical Data • Enclosure: Policarbonate •Connections: 1" Thread GAS/NPT • Temperature Limits: • Working pressure manufacturing according to PED 97/23/CE (Lloyd's Register Certificate Ns 031) • Pressure Limits: Thread (BSP/NPT) 16 bar • Power Supply: •...

The optimum mounting position depends on the liquid viscosity and the detection position. optimal, as also is in Pos. 1a for side moun- In both positions the liquid can flow easily trought the fork allowing correct detection of Pos. 2 Shows that with couplings with a small diameter (less than DN 50) the fork must be completely outside the neck of teh coupling. La Pos. 2a allows the fork to be mounted insi- de the neck of the coupling, but only when the diameter is greater than DN 50 and the liquid viscosity allows is to flow out fast. Viscous liquids Pos. 3 & 3a requie a minimum distance...

Hight temperatures in the tank may require thermal insulation. The LD61 can be supplied with required extra lenght. The standard extra lengh is 150 mm (fig. 1) The mounting position of the level detector should not coincide with the point at which liquid falls in the If during the filling of the tank strong waves are produced, the level detector must be protected. When controlling levels in moving tanks, a guide pipe should be mounted, with a PTFE pushing at the lower end to avoid vibrations that could effect the level

The LD61 can be supplied with a sliding system to adjust the height of the different maximum or minimum detection points that may be requiered in different processes in closed tanks. The stuffing box supplied is fitted with a PTFE gland. The level differential C between maximum and minimum = In this ense lenght LI (300 mm) is the minimum level. The lenght LS is the maximum level (200 mm). In tanks with agitators, the LD61 ML detector must be protec- ted against the force of the rotating liquid in their whole Dosing tanks Malema Sensors email: lndustrialSaies@malenna.com