What Is a Digital Indicator?
A digital indicator is an instrument used for displaying measurements, such as those seen in speedometers or fuel gauges in vehicles. Unlike analog indicators, which rely on mechanical amplification to display measurements, digital indicators use encoders or scales to directly read displacements. They provide the ability to set maximum and minimum values within the tip’s push-in range and resolution, requiring a display unit to convert displacement into digital readings.
Uses of Digital Indicators
Digital indicators serve similar functions to analog indicators but offer the added advantage of external numerical value outputs. This feature allows for readings to be captured by PCs or other devices, eliminating the need for direct visual inspection of the display, which is particularly beneficial when the indicator is positioned out of view.
Principle of Digital Indicators
Digital indicators consist of three main components: a spindle for linear movement, an encoder for displacement reading, and a display for numerical output. Their design omits the mechanical parts necessary for analog indicators, like racks, pinions, and gears, simplifying the structure. However, electronic components like encoders and circuit boards may be more susceptible to environmental factors such as electrical noise or oil mist, potentially affecting accuracy and functionality.
How to Select a Digital Indicator
- Purpose and Needs: Clearly define the application and what data or measurements need to be tracked and displayed.
- Interface and User Friendliness: Choose an indicator with an intuitive interface, ensuring data is easily accessible and interpretable by end users.
- Measurement Range: Consider the required measurement accuracy and range, which varies by application. Note that higher accuracy and a broader range typically increase cost.
- Durability and Maintenance: Evaluate the indicator’s longevity and maintenance ease, considering the impact of accuracy over time and the availability of repair services.
- Cost and Budget: Balance the purchase cost against operational expenses, including maintenance. Align your selection with both budget and performance needs.