Series_LD_Vibrating_fork_level_Switch
6Pages

Level switches Series LD Vibrating fork level switch for liquids and solids            Robust and compact Suitable for liquids (model LD61) and solids (model LD60) No moving parts, low maintenance Corrosion resistant materials Not affected by temperature or pressure changes Suitable for liquids with viscosity up to 10000 cSt Liquid density higher than 0.6 kg/l Solids: depending on application Detection length: up to 2 m Switching time: 1 s approx. Connections: - Threaded connections G1 or 1” NPT - Flanged connections EN 1092-1 DN40 PN25 Other flange standards on request - Sanitary connections according to ISO 2852, SMS 1145, DIN 11851, TRI-CLAMP® Materials: request EN 1.4404 (AISI 316L). HALAR® coating on Level detection, with LED status indication

Working principle The LD series level switches are based on the variation of the natural resonant frequency of a vibrating fork when it comes into contact with a liquid or a solid. This variation is detected by the internal electronics and is used to determine the state of the output. Receiver Connector / Housing  Open and pressurized tanks, tanks with agitation  Open channel and empty / full pipe detection liquids level detection solids level detection liquids or solids level detection, with relay output liquids or solids level detection, with NAMUR Ex output  Chemical dosing tanks...

Level switches Series LD Dimensions LD60 / LD61 - BSP / NPT threaded connections Weight: 0.32 kg (standard length) Fully hygienic design available Fully hygienic design available Minimum distance to bottom All dimensions in mm Minimum distance to bottom Other sanitary couplings available on request. Fully hygienic design available for all the models with sanitary couplings.

- 2 wires: 24 ... 250 VAC. Max. load 350 mA - 3 wires: 12 ... 55 VDC. Max. load 350 mA Min. load: 6 mA  Outputs: PNP transistor for DC power supply; tiristor for AC power supply  Power supply: - 8 ... 14 VDC - Consumption: from 0.7 mA to 2.3 mA, depending on the status “ON/OFF”  Status indication by means of LED  Status indication by means of bicolour LED  Housing: IP65 DIN 43650-A connector, PG9 cable gland  Housing: IP65 DIN 43650-A connector, PG9 cable gland  Fluid temperature:  Ambient temperature:  ATEX certificate Ex ia IIC T4 (T6 on request) Model LD60R ... LD61R ...

Level switches Series LD Mounting The optimal mounting position depends on the liquid viscosity. Both top of the tank (fig. 3a) and side (fig. 3b) mounting are optimal. In both positions the liquid can flow easily through the fork allowing correct detection of the liquid level. Connection size In case of a small connection (smaller than DN50) the fork must be completely outside the neck of the coupling (fig. 4a) in order to make sure that particles inside the neck will not affect the level switch performance. In cases with big connection sizes (bigger than DN50), the fork can be mounted...

Control of level in tanks and tanks with agitation Accessories The LD series can be supplied with a sliding system to adjust the height of the different maximum or minimum detection points that may be required in different processes in closed tanks. The stuffing box supplied is fitted with a PTFE gland. Example The level differential C between maximum and minimum = 100 mm. In this case length LI (300 mm) is the minimum level. The length LS is the maximum level (200 mm). In tanks with agitators, the LD61ML detector must be protected against the force of the rotating liquid in their whole...