Mettler Toledo LJ16 Spécifications télécharger pdf (Page 47)

Chapter 5: General Installation Guidelines

Tank and Vessel Design

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5-5

air is vented, pressure will build up inside the tank. The increased pressure will

produce a weighing error until a pressure balance can be restored. A similar

condition occurs when a material is discharged rapidly from a tank, creating a

partial vacuum inside the tank. To prevent pressure imbalances, make sure that

the tank is adequately vented. That will allow you to weigh the contents accurately

as soon as the tank is filled or emptied, instead of having to wait for a pressure

balance to be restored. Vents should be vertical and provided with clean-out

doors and fume stops or dust collectors.

Provisions for Test Weights

If you are going to use test weights to calibrate a tank scale, you will need some

way to hang the test weights from the tank. In most cases, this can be done with

some type of mounting lugs spaced evenly around the tank. Figure 5-7 shows a

mounting lug with a test weight hanging from it. Use a hoist for raising/lowering

the weight.

Figure 5-7: Mounting Lugs for Test Weight

Mounting Lug

Test Weight

Hoist/Jack

Chain or

Nylon Strap

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Mettler Toledo LJ16 Spécifications Page 47