What Is an Indicator?
- Indicators are statistics used to measure current conditions as well as to forecast financial or economic trends.
- Economic indicators are statistical metrics used to measure the growth or contraction of the economy as a whole or sectors within the economy.
What is an indicator and what is its purpose?
Indicator (distance amplifying instrument) In various contexts of science, technology, and manufacturing (such as machining, fabricating, and additive manufacturing ), an indicator is any of various instruments used to accurately measure small distances and angles, and amplify them to make them more obvious.
What are some examples of an indicator?
Types of Indicators
- Acid-Base Indicator
- Natural acid-base indicators
- Indicators of oxidation-reduction reactions (redox)
- Adsorption (precipitation) indicators
- Metallochromic or complexometric indicators
- Chemical indicators with luminescence capacity
- Chemical moisture indicators
- Chemical indicators of sterilization
Which indicator to use?
- Trend Following Indicators allow you to determine whether an asset is currently overbought or oversold. ...
- Momentum Indicators, such as the Relative Strength Index (RSI), allow you to determine the direction and strength of a current price trend. ...
- Volume Indicators help traders identify the (strong) relationship between price and volume. ...
What do the different indicators mean?
Indicators are clues, signs or markers that measure one aspect of a program and show how close a program is to its desired path and outcomes. Indicators are realistic and measurable criteria of project progress. They should be defined before the project starts, and allow us to monitor or evaluate whether a project does what it said it would do.
Why are indicators used?
It shows a visible change in terms of color change and turbidity in the titrated solution. Fast reaction and alteration in physical or chemical change of the solution at the equilibrium point are shown by the indicator.
What are two uses of indicators?
found in Gault (2010), who outlines four ways that indicators are used for policy purposes: monitoring, benchmarking, evaluating, and “foresighting.”
What are the 3 types of indicators?
Outcome, process and structure indicators Indicators can be described as three types—outcome, process or structure - as first proposed by Avedis Donabedian (1966).
What are 5 types of indicators?
Type of indicatorsInput indicators. These indicators refer to the resources needed for the implementation of an activity or intervention. ... Process and output indicators. Process indicators refer to indicators to measure whether planned activities took place. ... Outcome indicators. ... Impact indicators.
What are examples of indicators?
Some examples of indicators are Litmus, turmeric, phenolphthalein, etc. Any material that offers a visual evidence of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution, generally by a colour change are called the chemical indicators.
What are common uses of pH indicators?
pH indicators can be used in a variety of ways, including measuring the pH of farm soil, shampoos, fruit juices, and bodies of water. Additionally, pH indicators can be found in nature, so therefore their presence in plants and flowers can indicate the pH of the soil from which they grow.
What indicator is used in the experiment?
A common choice of indicator for such a strong-strong titration is phenolphthalein. Phenolphthalein is colorless in aqueous solution below a pH of 8.2. Above a pH of 8.2, but below 10.0, it changes to a strong pink color.
Where are natural indicators used?
Indicators are helpful in determining the acidic or basic nature of a given substance.When indicators are added to acidic or basic solutions, they change their color accordingly.Natural indicators are those which can be extracted by plants.For example: lichens, turmeric, china rose, and red cabbage.
What is an indicator in science?
Indicator (distance amplifying instrument) In various contexts of science, technology, and manufacturing (such as machining, fabricating, and additive manufacturing ), an indicator is any of various instruments used to accurately measure small distances and angles, and amplify them to make them more obvious.
What are the different types of indicators?
Other types of indicator include mechanical devices with cantilevered pointers and electronic devices with digital displays. Electronic versions employ an optical or capacitive grating to detect microscopic steps in the position of the probe.
What is the range of a dial indicator?
The range and precision of these devices were generally inferior to modern dial type units, with a range of 10/1000 inch to 30/1000 inch, and precision of 1/1000 inch being typical. One common single lever test indicator was the Starrett (No. 64), and those using systems of levers for amplification were made by companies such Starrett (No. 564) and Lufkin (No. 199A), as well as smaller companies like Ideal Tool Co. Devices that could be used as either a lever test indicator or a plunger type were also manufactured by Koch.
How to mount a dial indicator?
Mounting the indicator may be done several ways. Many indicators have a mounting lug with a hole for a bolt as part of the back plate. Alternately, the device can be held by the cylindrical stem that guides the plunger using a collet or special clamp, which is the method generally used by tools designed to integrate an indicator as a primary component, such as thickness gauges and comparators. Common outside diameters for the stem are 3/8 inch and 8 mm, though there are other diameters made. Another option that a few manufacturers include is dovetail mounts compatible with those on dial test indicators.
How does a dial indicator work?
The internal works of a mechanical dial indicator are similar to the precision clockworks of a mechanical wristwatch, employing a rack and pinion gear to read the probe position , instead of a pendulum escapement to read time. The side of the indicator probe shaft is cut with teeth to provide the rack gear. When the probe moves, the rack gear drives a pinion gear to rotate, spinning the indicator "clock" hand. Springs preload the gear mechanism to minimize the backlash error in the reading. Precise quality of the gear forms and bearing freedom determines the repeatable precision of measurement achieved. Since the mechanisms are necessarily delicate, rugged framework construction is required to perform reliably in harsh applications such as machine tool metalworking operations, similar to how wristwatches are ruggedized.
What is a DTI tip?
DTI tips are often threaded for interchange (like drop indicator tips), with small flats to accept a spanner; but the intent regarding user-serviceable tip change is limited only to the tips that originally came with the indicator, because of the above-mentioned importance of the length.
What is a dial test indicator?
Dial test indicators, whose tips swing in an arc rather than plunging linearly, usually have spherical tips. This shape gives point contact, allowing for consistent measurements as the tip moves through its arc (via consistent offset distance from ball surface to center point, regardless of ball contact angle with the measured surface). Several spherical diameters are commercially offered; 1mm, 2mm, and 3mm are the standard sizes.
What is an indicator in chemistry?
Another type of indicator that may be encountered in chemistry and other sciences is a pointer or light on a device or instrument, which may show pressure, volume, temperature, etc. or the condition of a piece of equipment (e.g., power on/off, available memory space). The term "indicator" comes from the Medieval Latin words indicare (to indicate) ...
Where does the word "indicator" come from?
The term "indicator" comes from the Medieval Latin words indicare (to indicate) with the suffix -tor .
What is an indicator in a titration?
An indicator may be used to identify the endpoint of a titration. This may involve the appearance or disappearance of a color. Indicators may indicate the presence or absence of a molecule of interest. For example, lead tests, pregnancy tests, and nitrate tests all employ indicators.
What is fluorescent indicator?
Other types of fluorescent indicators are designed to bond to selected molecules. The fluorescence signals the presence of the target species. A similar technique is used to label molecules with radioisotopes. An indicator may be used to identify the endpoint of a titration.
What is chemical indicator?
Updated July 15, 2019. A chemical indicator is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a color change, precipitate formation, bubble formation, temperature change, or other measurable quality. Another type of indicator that may be encountered in chemistry ...
Can chemical indicators be detectable?
The type of indicator depends on how it's being used. For example, a sample analyzed with spectroscopy may employ an indicator that wouldn't be visible to the naked eye, while a test for calcium in an aquarium would need to produce an obvious color change.
Why do we need test indicators?
Test indicators can make a machine operator’s job a lot easier because they can measure what the human eye cannot see. They are particularly helpful for those working with lathes, jig borers, and milling machines. Test indicators make checking for flatness, roundness, or runoff a snap. They can also help an operator locate part center.
How to use a dial indicator?
The first step in using a dial test indicator is getting it properly calibrated. The goal is to get the hand pointer to point to zero on the face dial. You can spin the indicator’s bezel until you see it at zero. This should always be the starting point for your indicator. Now you are ready to begin measuring. Test indicators perform best when you can adjust the tilting lever arm to be as perpendicular as possible with the machine part surface. When you are satisfied, lock the arm into place. Read the indicator as the machine part moves, which in turn, moves the indicator hand. This step requires knowing what measurements are ideal for a specific machine’s optimal operation.
Why do we need an indicator for titration?
The color changes is not definite that’s why sodium diphenylamine is used. But some titration do not need an indicator because of intense color of constituent.
Why are universal indicators not used for titration?
Universal indicators are not used for titration because they give different color at different pH. Methyl orange or phenolphthalein are mainly used they cause change in color at neutralization which is easier to see the end point of titration. The most important property of an indicator is pH range which is depend upon the strength of an indicator.
Why does titration not need an indicator?
But some titration do not need an indicator because of intense color of constituent. Gas phase Titration. This titration is carried out in gas phase. In this method reactive substances are reacted with an excess of some other type of gas which is called as titrant.
When is a drop of indicator added in a titration?
A drop of indicator is added in the start of the titration , the endpoint has been appeared when color of the solution is changes. Redox indicators are also used which undergo change in color at specific electrode potential [2]. Different indicators are used but depend on the strength of an acid and alkali.
Why is methyl orange not a color indicator?
In this case both acid and base are weak in nature that’s why neither methyl orange nor phenolphthalein indicators works to give color.
What are trading indicators?
In essence, I qualify as an indicator of everything behind the price action that helps you with your decision-making while trading.
What does delta mean in a bid?
A delta represents finalized executions at the bid and the offer.
What is open interest in trading?
The open interest represents the total number of contracts currently opened in the market.
Overview
In various contexts of science, technology, and manufacturing (such as machining, fabricating, and additive manufacturing), an indicator is any of various instruments used to accurately measure small distances and angles, and amplify them to make them more obvious. The name comes from the concept of indicating to the user that which their naked eye cannot discern; suc…
General classification
There are several variables in dial indicators:
• Analog versus digital/electronic readout (most are analog)
• Dial size. Typically referred to be American Gauge Design Specification (AGD):
AGD Diameter range (in) Diameter range (mm) 0 1 > 1-⅜ 25 > 35 1 1-⅜ > 2 35 > 50 2 2 > 2-⅜ 50 …
There are several variables in dial indicators:
• Analog versus digital/electronic readout (most are analog)
• Dial size. Typically referred to be American Gauge Design Specification (AGD):
AGD Diameter range (in) Diameter range (mm) 0 1 > 1-⅜ 25 > 35 1 1-⅜ > 2 35 > 50 2 2 > 2-⅜ 50 …
Principles
Indicators inherently provide relative measure only. But given that suitable references are used (for example, gauge blocks), they often allow a practical equivalent of absolute measure, with periodic recalibration against the references. However, the user must know how to use them properly and understand how in some situations, their measurements will still be relative rather than absolute because of factors such as cosine error (discussed later).
Applications
• In a quality environment to check for consistency and accuracy in the manufacturing process.
• On the workshop floor to initially set up or calibrate a machine, prior to a production run.
• By toolmakers (such as moldmakers) in the process of manufacturing precision tooling.
Probe indicator
Probe indicators typically consist of a graduated dial and needle driven by a clockwork (thus the clock terminology) to record the minor increments, with a smaller embedded clock face and needle to record the number of needle rotations on the main dial. The dial has fine gradations for precise measurement. The spring-loaded probe (or plunger) moves perpendicularly to t…
Dial test indicator
A dial test indicator, also known as a lever arm test indicator or finger indicator, has a smaller measuring range than a standard dial indicator. A test indicator measures the deflection of the arm, the probe does not retract but swings in an arc around its hinge point. The lever may be interchanged for length or ball diameter, and permits measurements to be taken in narrow grooves and smal…
Test indicator
Prior to modern geared dial mechanisms, test indicators using a single lever or systems of levers were common. The range and precision of these devices were generally inferior to modern dial type units, with a range of 10/1000 inch to 30/1000 inch, and precision of 1/1000 inch being typical. One common single lever test indicator was the Starrett (No. 64), and those using systems of levers for amplification were made by companies such Starrett (No. 564) and Lufkin (No. 199…
Digital indicator
With the advent of electronics, the clock face (dial) has been replaced in some indicators with digital displays (usually LCDs) and the clockwork has been replaced by linear encoders. Digital indicators have some advantages over their analog predecessors. Many models of digital indicator can record and transmit the data electronically to a computer, through an interface such as RS-232 or USB. This facilitates statistical process control (SPC), because a computer can recor…