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Types of Indicators

5/2/2012 6:19:26 PM | by Anonymous


Indicator is an instrument that indicates the condition of an engine, furnace, industrial machine or any substance. Some of its everyday uses are examining the acidity of the soil to ensure that healthy growth of plants, testing home swimming pools as they need to be approximately neutral and knowing how much gas is in the tank of a car. These monitoring can be done by the use of a dial or digital indicators.


Dial indicators, also known as a test gauge, are the first precision measuring tool used in the machine shop industry to test alignment and rotation measurement of machine parts. It is composed of a spindle, gear and a dial with pointer on it. Reading the measurement on a dial indicator involves three processes: interpreting the pointer’s position, recording the data and entering it into the computer. Since three steps are involved, this type of indicator is more vulnerable to errors. It also does not feed exact measurement right away since one has to wait for the pointer to stop moving. The advantages of using dial indicator are they last long and never need batteries. It is getting hard to find people who can repair this device so proper care is needed to avoid its breakage.


Digital indicators display processes through numbers and letters. There are digital indicators that have the ability to record and transfer the data electronically to a computer. This process avoids mistakes in recording measurement results and makes encoding of information faster which is normally time consuming when done by human. A digital indicator serves as a unit converter. It has a button that once pressed can switch measurements between metric and inch units.


Indicators exist to serve its main purpose and that is to make sure that mechanical equipment are constantly working at its optimum performance and will pass the specified quality control tests.

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