Tuesday, November 24, 2015


InstaConvert Update Released - Tool for Converting Instrumentation standard signals and Process Variables (Instrumentation Unit Converter)

  • Tuesday, November 24, 2015
  • dpubmirror

  • Unit Conversion tool built by automationforum.in made for Instrumentation and Automation Engineers releases started rolling out updates.

    The latest updates includes a calibration tool too.

    Updates - 0.1.0

    • Removed Ads - Courtesy for automationforum.in users who sends feedback.
    • History - Option to save and view conversions done.
    • Calibration - x - y range to percentage
    • New UserInterface
    • Search for units

    Send your feedback : forumautomation [at] gmail.com

     Get it on Google Play
    instaconvert unit conversion tool for calibration %'s
    Calibration range to 25%, 50%, 75%
    Calibration Search for units Instacovert
    Search for Units
    instaconvert unit conversion log
    Conversion History
    InstaConvert - Settings

    Saturday, November 7, 2015


    Free PID Loop Simulation - Office Excel

  • Saturday, November 7, 2015
  • denizen robo

  • PID Loop tuning is one of the important activity carried out by instrumentation or process engineers  during plant startup and day to day instrumentation maintenance activities.

    Several PID loop tuning spread sheets are available in the internet.We are discussing about some of the best PID loop tuning spreadsheet.

    PID Loop Tuning Spreadsheet by Engineers-Excel .com 

    PID Simulator Spreadsheet Free

    This spreadsheet simulates a control loop consist of a first order process with deadtime and a PID controller.

    How to use tune PID controller with the help of PID simulator spreadsheet?

    Step 1: Do a step test in manual mode and collect test data.

    Step 2: Identify process model parameter

    Step 3: Tune offline

    Step 4: Implement in controller and fine tune if required .

    You can find more documentation and spreadsheet for download from following link : Download link

    Free PID simulator by Carnegie Mellon University

    This PID simulator spreadsheet is absolutely free . You can download it from Automationforum

    Related topics :
    Instaconvert - Instrumentation signal converter 
    Unit Conversion
    PID Tuning rules
    PID Tuning


    Sunday, November 1, 2015


    InstaConvert - Android Application to Convert Instrumentation standard signals and Process Variables (Instrumentation Unit Converter)

  • Sunday, November 1, 2015
  • denizen robo

  • InstaConvert is an android application to convert Instrumentation Standard Signals and Process variables.InstaConvert is absolutely free. You can download it from Google Play Store.


    Following parameters can be converted with InstaConvert

    Instrumentation Standard Signals

    4-20 ma to Percentage
    3-15 psi to Percentage
    0-20 ma to Percentage
    0-25 ma to Percentage

    Process Variables (Unit Converter)


    Other Parameters

    Fuel Consumption
    Digital Storage
    Electric Current

    More updates are coming soon .Waiting for you feed back.

    InstaConvert unit converter is designed for Instrumentation and electrical engineers.

    Download it from Google Play store : InstaConvert

    Instrumentation Unit Converter - Instrumentation Standard signals and Process Variable


    Keywords - Unit Converter ,Instrumentation Signal Converter , Process Variable Unit Converter .


    Sunday, September 20, 2015


    Pressure Measurement - Bourdon Gauge -Working Principle Advantages and Disadvantaged

  • Sunday, September 20, 2015
  • denizen robo

  • Working Principle Of Bourdon Gauge 

    If a tube having oval cross section is subjected to pressure its cross section tends to change from oval to circular.

    working principle of Bourdon Gauges

    Construction of a Bordon Gauge 

    Bourdon tube gauges consist of a circular tube.

    One end of the tube is fixed while the other end is free to undergo elastic deformation under the effect of pressure.

    Fixed end is open and pressure which is to be measured is applied at the fixed end.

    Free end is closed and undergoes deformation under the effect of pressure.

    Due to applied pressure the circular tube tends to uncoil and become straight along the dotted line.

    Bourdon Gauge Construction

    Working of Bourdon Gauge 

    As the pressure is applied at the fixed end free end undergoes deformation.

    The free end is attached with sector which further meshes with the pinion on which pointer is mounted.

    Deformation of the pointer is transferred to pointer via this mechanism.

    As a result point undergoes deflection and shows the pressure reading on calibrated dial.

    Advantages of Bourdon Gauges 

    2.Simple Design
    3.Good accuracy except at low pressure.
    4.High-pressure range.
    5.It can be easily used with electrical devices like LVDT.

    Disadvantages of Bourdon Gauges.

    1.Susceptible to shock and vibration
    2.Gauges are subjected to hysteresis

    Related Topics
    Basics of Pressure Measurement 
    Pressure Measurement - Manometer 
    Classify Pressure Measuring Instruments 


    Sunday, September 13, 2015


    Differential Pressure flow measurement - How it works ? Advantages and Disadvantages of DP flow measurement

  • Sunday, September 13, 2015
  • denizen robo

  • Working Principle of Differential Pressure Flow Measurement 

    Flow measurements are essential to  run a plant efficiently and safely.There are no real flow measurement technologies available including differential pressure flow also known as DP flow which utilizes a variety of measurement instruments.

    DP flow is measured with the combination a primary element and a secondary elements.

    The primary element is placed in the pipe to create a differential pressure and connecting
    the secondary element to the process.

    The secondary element or transmitter takes measurements from the primary element and converts them into useful quantitative values and transmits those values to a control system.

    There are many types of  primary elements including traditional orifice plate cone venturi nozzle wedge
    Primary elements differential pressure flow measurement

    How to select a differential pressure flow measurement Primary element?

    Primary element selection is dependent on process conditions.All these different primary 
    elements have one thing in common, they constrict the flow in a pipe causing a pressure 
    drop from one side to the other. the difference in pressures is the differential pressure. 
    The square root DP is proportional to the flow rate.

    Working Principle - Differential pressure Flow Measurement

    Traditionally transmitters were connected to the process with external impulse piping.
    Modern DP Flow Transmitters -The impulse piping is built into the primary element this allows the transmitter to be directly mounted to the process line.Advantages of this type of flow transmitters are Easy installation and reduce maintenance cost

    Advantages of Modern Differential Pressure Flow Transmitters.

    1.Simple technology with no moving part.
    2.Compact sensor
    3.Configurable for bi-directional flow
    4.Usable over a very wide range of sizes 
    5.Relatively inexpensive

    Disadvantages of DP flow measurement.

    1.Limited accuracy and turndown range
    2.Causes a pressure drop and reduces pipe's free passage
    3.Orifice often a wear-prone point
    4.Depends on good pressure sensor practice
    5.Changes in liquid characteristics can affect readings.

    Related Topics:


    Sunday, August 23, 2015


    Variable Area Flow Meter - Application - Working Principle - Advantages

  • Sunday, August 23, 2015
  • denizen robo
  • Variable Area Flow Meters 

    Variable area flow meters are used to measure the volume flows of liquid and gases.

    Application of Variable Area Flow Meter - Volume flow measurements of Liquids and Gases

    Components -  Vertical Conical Measuring Tube
                              Mobile Float

     It consist of vertical conical measuring tube which widens upwards and a specially formed float which can move up and down freely in the measuring tube.

    Working Principle - 

    Variable area flow meter working principle

    The reference of position of the float to the measuring tube creates a variable ring orifice.The higher the position of the float the larger the ring orifice and therefore the cross sectional area through which the medium come pass through the float.This is the origin of the English designation of the device.

    When there is no flow, gravity keeps the float at the bottom end of the measuring tube.
    As soon as the medium flows through the tube from bottom to top the float rises again until the acting forces are in balance.

    Three main forces act on the movable float.
    1. Graviatation force (W = Weight) - Operates downwards as a reset force.
    2. Buoyancy force (B)
    3. Flow force (D=Drag)

    Weight = Drag + Bouyancy

    W and B = Constant

    The position of the float is a flow indicator.
    The physical operating mode shows that the position of the float is a flow indicator.
    With glass cones flow rate can be read on a scale on the measuring chip itself.

    With the metal cones the float is not visible so they have a magnetic transfer onto the pointer.For this purpose a magnet is built into the float.Through a magnetic coupling installed on the point of axis the linear movement of the float float is converted into the rotary movement of the pointer which displays the flow on a scale.No auxiliary power supply is required.

    Advantages of Variable area flow meter

    Advantages of Variable area flow meter - Purely mechanical.No auxiliary power is requires.

    Related posts - 
    Flow transmitter calibration 
    Type of Valves


    Sunday, August 2, 2015


    hat are the different types of DC Motors and how to select DC motors for your application?

  • Sunday, August 2, 2015
  • denizen robo
  • The most common DC motors types are

    1.The basic brushed DC motors
    2.Brushless motor
    3.Permanent Magnet motor

    Brushed DC motor

    In a brushed DC motor, the magnet acts as the stator.The armature is integrated onto the rotor and a commutator switches the current flow.Commutator function is to transfer current from fixpoint to the rotating shaft.Brush DC motors generate torque straight from the DC power supply to the motor by using internal commutation.

    Advantages of Brushed DC motors - Low initial cost  
                                                                Simple control of motor speed

    Disadvantages of Brushed DC motors - At certain period during a DC motor rotation commutator must reverse the current causing reduced motor life due to arching in friction.


    Brushless DC motor

    A brushless DC motor is essentially a DC motor without mechanical commutation of the brushed DC motor.Brushless DC motors are powered by Direct current and have electronic commutation system. The Permanent magnet is housed in the rotor and the coils are placed in the stator.
    Advantages of Brushless DC Motor - Resistant to mechanical wear and tear 

    How to select DC motor for your application?

    For selecting motors for your application, you have to have a full understanding of the application parameters including power,speed,torque,physical size,efficiency,lifetime expectations.

    Key criteria for selecting a DC motor includes first finding out what voltage is readily available for the application and what physical size the motor needs to be.Torque and speed have an effect in motor frame size.High torque motors are often larger in size than their low torque counterparts.

    Related articles: