Mettler Toledo LJ16 Spezifikationen PDF herunterladen (Seite 41)

METTLER TOLEDO Weigh Module Systems Handbook

(12/99)4-10

NIST Handbook 44 legal-for-trade tolerances. The service/storage range is the

temperature range in which the load cell will operate without physical damage.

METTLER TOLEDO Load Cells

Compensated Range -10°C to +40°C (+14°F to +104°F)

Service/Storage Range -50°C to +85°C (-58°F to +185°F)

Table 4-3: Load Cell Temperature Specifications

In applications with high temperatures inside the tank, you can reduce thermal

conduction by placing insulation between the tank and the weigh modules. Use

insulating material with a compressive strength above 15,000 psi and thermal

conductivity ratings below 2.0 BTU-in/ft

/hr. The material must be able to withstand the

exposure temperature for prolonged periods without breaking down or deforming. Two

recommended FDA-approved materials are listed below:

Acetron® GP Acetal (Acetron is a registered trademark of DSM)

• Continuous Service Temperature: 180°F

• Heat Deflection Temperature at 264 psi: 220°F

• Thermal Conductivity: 1.6 BTU inches/hour/foot

/°F

• Coefficient of Thermal Linear Expansion: 5.4 × 10

-5

• Compressive Strength: 15,000 psi

Ultem 1000 Polyetherimide (PEI)

• Continuous Service Temperature: 340°F

• Heat Deflection Temperature at 264 psi: 392°F

• Thermal Conductivity: 0.9 BTU inches/hour/foot

/°F

• Coefficient of Thermal Linear Expansion: 3.1 × 10

-5

• Compressive Strength: 22,000 psi

Moisture and Corrosion

Moisture or corrosive material on a weigh module can affect the life of the load cells.

Debris, such as leaves and dirt, accumulated in and around weigh modules can also

cause problems. There are several steps you can take to minimize the potential for

moisture and corrosion problems:

• Provide adequate drainage away from the weigh modules.

• Keep weigh modules clear of snow that will melt and introduce moisture into the

system.

• Do not use tanks with flat tops that catch and retain water, snow, leaves, or other

debris that will add uncompensated weight to the system.

• Hose down the tanks regularly to clean accumulated debris.

• Keep cables clean and in good condition. Broken cables or worn cable sheathing

can allow water to enter and cause corrosion.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 197 198

Kommentare zu diesen Handbüchern

Keine Kommentare

Mettler Toledo LJ16 Spezifikationen Seite 41

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Elektrische Wäschetrockner Mettler Toledo LJ16