Attention: Check the load cell packaging for damage, which may have been caused by transportation. About visible damages immediately inform the Supplier.
Incorrect transportation can lead to material losses. Be careful when unloading the packaged items during delivery and transporting them within the facility, act carefully and follow the instructions given in the form of symbols on the packaging and in this manual.
Transportation
- As high-precision measuring instruments, load cells require careful handling during transportation, storage, and installation. Load as a result of a hit during transportation (for example, falling on a hard surface) can lead to a defect in the device, as a result of which might be errors for the next measurements;
- The equipment must be transported in its original packaging;
- The packaged equipment can be moved with all types of transport at temperatures from –30 °С to +50 °С protected from direct exposure to precipitation and mechanical damage;
- When the packaged equipment has been moved from the environment where the temperature is 0°С and lower to a warm placement, it’s needed
to keep it in the packaging in the same placement for at least 2 hours for the reason to avoid condensation and as the result, an equipment failure after switching it on. - Don’t remove the packaging until the installation. Save the packaging (for example, for packing in case it changes installation place or maintenance).
Package and storage
- The equipment must be stored in its original packaging, in a dry room in the absence of acidic, alkaline, or other active impurities in the air. Storage outdoors or under a canopy is not allowed;
- The equipment is intended for storage in the environment with air temperatures from +5 to +40°С;
- Humidity: 35…85% RH (non-condensing)
- During storage, avoid exposure to factors such as mechanical vibrations, and mechanical shocks (shocks due to a sharp installation).
Recommendations regarding the operation of load cells
For the trouble-free operation of the sensors, several basic principles must be observed:
- Load cells mustn’t be loaded above the set value. The load limit, after which the manufacturer does not guarantee the functionality of the sensor, is usually 150-200% of the rated load – you can see the value of this parameter in the technical specification of the load cell;
- Load cells mustn’t be affected by increased voltage (lightning strikes, electric arc during welding, voltage penetration into the sensor housing, etc.);
- Load cells mustn’t come into contact with water outside the relevant protection (IPxx, you can see the value of this parameter in the technical specification of the load cell);
- Load cells (except the high-temperature sensors) can be used in the temperature range from -10 to 40 °C. Outside this range, the manufacturer doesn’t guarantee proper operation;
- Cable of the analog load cell is part of the measurement device. Changing the cable length leads to a change in active resistance in the transducer input or indicator. A significant change in the cable length of one or one more load cells of the weighing system causes the readings to scatter around the corners (the difference between the weighing results caused by the change in the position of the load);
- Cable of the load cell must be protected from mechanical effects, in a case when the cable is damaged, the input (or output) branch may be short-circuited or water will penetrate into the sensor due to a cable break;
- It’s possible a negative effect on the load cell and its accuracy if it’s near a very powerful source of electromagnetic or other electrical interference;
- Load cells are not recommended to be subjected to strong mechanical vibrations, impacts from the side, from below, and sudden strong dynamic impacts. It is recommended by additional methods (for example, using built-in units with a built-in load limiter) to ensure the safety of equipment from mechanical destruction of the sensor and related events (rupture of cable elements of crane scales, overturning of silos, etc.)
If these instructions for the safe operation, transportation, and storage of load cells are not followed, KELI SENSING is not responsible for the destruction of the sensors, premature failure, and other damage.