CST CST Environmental Factors & Scale Performance

Question 1

How does a significant temperature change typically affect a load cell's output reading?

Accepted Answer

It causes a shift in both zero and span due to thermal expansion and changes in strain gauge sensitivity

Answer

It has no measurable effect on calibrated digital load cells

Answer

It only affects the scale indicator display, not the load cell signal

Answer

It only increases the load cell's rated capacity

Question 2

What is the purpose of a temperature compensation circuit built into a load cell?

Accepted Answer

To minimize the effect of temperature changes on the load cell's output signal accuracy

Answer

To actively heat the load cell in cold weather conditions

Answer

To prevent condensation from forming on the load cell housing

Answer

To regulate the operating temperature of the scale indicator

Question 3

What is the typical operating temperature range specified for most commercial industrial scale load cells?

Accepted Answer

-10°C to +40°C

Answer

-50°C to +100°C

Answer

0°C to +20°C only

Answer

-100°C to +200°C

Question 4

How should a scale be handled after being moved from a cold storage area to a warm room before calibration?

Accepted Answer

Allow the scale to fully acclimate to the ambient temperature before calibrating

Answer

Calibrate immediately while the load cell is still cold for best accuracy

Answer

Increase the span setting by a fixed percentage to compensate for temperature

Answer

Replace the load cell since thermal shock may have damaged it

Question 5

What effect does direct sunlight have on an outdoor truck scale platform during summer operation?

Accepted Answer

Uneven thermal expansion of the steel platform stresses load cells and shifts zero readings

Answer

No measurable effect since steel is a good thermal conductor

Answer

It improves accuracy by drying any moisture from the platform surface

Answer

It increases the platform's effective capacity rating

Question 6

What is 'thermal zero drift' as specified in a load cell datasheet?

Accepted Answer

The gradual shift in the zero output reading per degree of temperature change

Answer

A calibration technique for correcting zero at elevated temperatures

Answer

A type of mechanical failure mode caused by overheating

Answer

An error code displayed when the load cell overheats