![]() ![]() An optional pin on the sensing weight prevents the weight from slipping down or tilting at the steep angles of repose, e.g. All materials from a density of 300 g/l can be measured. Measuring ranges of up to 30 m are possible. ![]() The instruments are available for supply voltages of 230 or 115 V AC as well as 24 V DC. Automatic tape cleaning is included for the latter preventing foreign bodies from penetrating into the instrument. ![]() They offer an alternative with rope, which is particularly suitable for dry products, and an alternative with measuring tape for sticky products. So as to avoid a contamination of the electronic equipment, the technical and mechanical ranges are strictly separated from each other in the apparatus ( Fig. An additional weather protection cover is a protection against climatic influences, such as rainwater, formation of condensate, excessive heating due to insolation and extreme cold in winter. Temperatures between – 40 and + 80 ☌ are no problem. The plumb bob is accommodated in an aluminium casing of the protective system IP66 to cope with the harsh conditions on the silo roof. Furthermore, the plumb bob equipment is very rugged and is distinguished by its high operational reliability and exactness. Changing moistures of the bulk solids as well as adherent material are not a problem for the measurement method either. The plumb bob technique is particularly suitable for these applications because dust inside the silo neither influences the results of measurement nor the conductivity of bulk solids. Alternatively the measured values can also be transmitted to a PC equipped with a corresponding interface card. With this technology the measurement can be started comfortably from the bottom or from the office and exact values will be obtained. Thus, the measured value is verified and, at the same time, the sensing weight is returned to its starting position. When reeling up again, the revolutions are also counted. Based on the reeled-off rope or tape length, the level of the container can be calculated. The rope tension indicates if the sensing weight is still freely moving in the air or if it already contacts the material filled in. When lowering the sensing weight into the container, the tape or the rope are reeled off until the sensing weight hits on the material to be monitored. The instruments are mounted on the roof of the silo. Essentially the measuring instrument consists of an electromechanically driven reel, a rope or a tape and a sensing weight at the end. they use a lowered weight fixed on a rope. The devices of the plumb bob technology basically apply a similar measuring method, i.e. The development work was focussed on the production of a measuring instrument with all the necessary and practical functionalities for these applications at a favourable price. 1) in particular for the building materials as well as the feed and grain industries. For this reason, the UWT GmbH have developed the plumb bob system Nivobob 4000 ( Fig. Apart from this, regular bustling around in such a height – usually these silos have a height of up to 30 m – is rather risky. Depending on how often the level has to be measured, such time-consuming methods quickly become no longer viable. ![]()
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