The majority of scales that are likely used at a concrete batching plant will have digital indicators. You will need accurate scales to measure out all the separate elements that go into making concrete – aggregate, cement, water and pigments if required. Digital scales are extremely easy to use and offer highly precise readings without some of the issues that are common with antiquated analog scales.
At Sprint Consys, we have all the modern methods of calibration so the weight is not just accurate, it is nearest to perfect so that mixing of each ingredient while batching will give the expected results.
Consider how these five factors can affect your system’s weighing accuracy:
1. Load cell accuracy.
2. Load factors.
3. Environmental forces.
4. Interference with signal transmission.
5. Instrumentation and control.
Load cell accuracy
Selecting a top-quality load cell for your weighing system is the first step in obtaining weighing accuracy. The load cell (also called a load sensor or transducer) is a piece of machined metal that bends with the load’s mechanical force and converts the mechanical force into an electrical signal. The bend doesn’t exceed the metal’s elasticity and is measured by strain gauges bonded at points on the cell. As long as the load is applied to the proper spot on the load cell, the strain gauges provide a proportional electrical signal.
Ensure that the load is applied to each load cell in your weighing system as specified by the manufacturer. An improperly applied load, such as a twisting load, causes the strain gauges in the cell to experience strain and send a signal change proportional to the twisting rather than the load’s weight.
Ensure that only the weight force is transmitted to each load cell. Other forces, including environmental forces such as wind loading, shock loading, vibration, large temperature changes, and pressure differentials, can produce errors in the load cell signal.
A pressure differential can create weighing errors by applying unwanted forces to the weighing system.
Interference with signal transmission
In addition to ensuring that the load cells measure only the desired weight, it’s equally important to ensure that the weight controller measures only the load cell electrical signal. Radio frequency interference (RFI), electromechanical interference (EMI), moisture, and temperature can all interfere with this electrical signal.
Achieving this kind of weighing accuracy means considering many factors, both mechanical and operational, that can affect your weighing system. Choosing quality components especially suited to your application will go a long way toward ensuring that your system provides the accuracy you need.
Sprint Consys is a leader in the design and development of technology for the weighing industry.
Instrumentation and control
Following the advice in the previous four sections will ensure that your load cell signal arrives at the weight controller in the cleanest form possible. But chances are, the signal still won’t be absolutely clean.
As a general rule, select load cells and a weight controller with accuracies 10 times better than your desired system accuracy. And pay close attention to how you install and operate the system to prevent mechanical forces and electrical noise from reducing your weighing accuracy.
You can expect a lot from Sprint Consys. We pride ourselves on bringing our customers the latest technology, superior quality, and the utmost value. Our scales feature many extras that can only be found on competitive scales costing three to five times as much.
Sprint Consys designs and fabricates all of the sub-assemblies that make a scale and we can apply our expertise to nearly any situation requiring weighing.