3 Types of Load Cells You Should Know

Load cells have different uses in the industry and on an oil rig. Accordingly, they're available in different designs to match the requirements of the job. 

Here's a closer look at load cells and some of their most commonly used types:

What is a Load Cell?

A load cell is a transducer. It's used to convert force into an electric output so that it can be accurately measured. Load cells can be categorized as different types depending on their weight detection mechanism or the output signal that they produce.

Different Types of Load Cells

The most popular types of load cells are:

·         Hydraulic load cells

·         Pneumatic load cells

·         Strain-gauge load cells

Each type is discussed below:

1. Hydraulic Load Cells

A standard piston and cylinder arrangement is used in a hydraulic load cell filled with oil. Since the piston is located inside an elastic diaphragm, the cell uses mechanical features to make sure that the diaphragm isn't subjected to too much strain.

Upon applying the load, the piston moves inside the diaphragm and causes the oil pressure to increase. This pressure is measured by a hydraulic pressure gauge and displayed on the dial where it can be easily read.

Since a hydraulic load cell lacks any electrical components, it's robust enough to be used in outdoor applications without adversely impacting its accuracy.

2. Pneumatic Load Cells

Pneumatic load cells are often preferred for their ability to keep their balancing pressure in check without human intervention. They use multiple dampeners, resulting in greater accuracy compared to other types of cells even when weighing small quantities.

Pneumatic load cells operate on air pressure. Load application causes the air pressure inside the cell to change, and this change is registered on a pressure gauge attached to the cell.

Besides their accuracy, a major benefit of pneumatic load cells is that they're impervious to changes in the temperatures. They're also explosion-proof, and their lack of fluids makes them ideal for usage in environments where cleanliness is a priority.

3. Strain-Gauge Load Cells

A strain-gauge load cell is by far the most widely used load cell in industrial settings, thanks to its high accuracy and cost-effective design.

Strain-gauge load cells use materials such as stainless steel or aluminum in their construction. The cell primarily consists of a grid that becomes slightly deformed during load application. This deformity creates a change in the electrical resistance of the attached gauges, which can then be measured as a voltage.

About Contact Instruments

Contact Instruments provides weight indicator systems, standpipe pressure gauges, load cells and pressure sensors, and drilling rig instrumentation to clients in Canada, United States, and elsewhere. The company's full product range can be seen on their website. Contact them for more information and sales inquiries.