Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Pressure to Current (P/I) Converter Principle
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Control Valves > Pressure to Current (P/I) Converter Principle

Pressure to Current (P/I) Converter Principle

Last updated: August 26, 2019 3:07 pm
Editorial Staff
Control Valves
5 Comments
Share
2 Min Read
SHARE

We can construct a pressure to current converter using a Flapper- Nozzle arrangement , Bellows and a Linear Variable Differential Transformer (LVDT) circuit.

Input pressure is given to Flapper-Nozzle arrangement and the output current will come through the LVDT.

Also Read : What is Flapper/Nozzle ?

Flapper Nozzle arrangement: It is type of pressure controlling device. It controls the input pressure by the moving the Flapper away or towards the nozzle, if we need high pressure, then nozzle will be closed by the Flapper and if we need less pressure, then nozzle will be opened by moving flapper away.

Bellows:- Bellows are one type of pressure measuring devices. They are the elements which will expand as per the applied pressure. Based on the displacement we can measure the pressure.

Linear Variable Differential Transformer (LVDT): It works on the principle of Mutual Inductance. In the LVDT three coils will be present. Primary coil is connected to a power source and secondary coils are connected in series opposition method.

At initial position, the voltage induced will be zero. If the core displaces, then due to inductance, voltage will be induced into the coils, resulting in the current.

Pressure to Current Converter

Pressure to Current Converter

First Input pressure is supplied to the Flapper- Nozzle arrangement.  Then it will supplied through a pipe and that pressure is given as input to the bellows. These bellows are connected to the Core of LVDT.

When pressure is applied to bellows, they will expand thus core displaces and the voltage is induced on the secondary coils of LVDT.

As voltage is induced, current will flow through the coil. That current is proportional to the input pressure applied. Thus Pressure is converted into equivalent current.

When compared with standard values we can covert 3-15 P.S.I of pressure can be converted to 4-20 mA of current

Articles You May Like :

Pressure Regulator Flapper-Nozzle

Transformer Theory of Operation

Pneumatic Sensing Elements

Electronic Pressure Sensors

C-Bourdon Tube Pressure Gauge

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Interactive Control Valve Parts Quiz: Drag & Drop Challenge
SIS Emergency Block Valves (EBV)
Bellows Seal Valve Working Principle
What is Mixing or Diverting Valve ?
Motor Operated Valve Problems and Troubleshooting
Rotork Motor Operated Valve Basic Configuration
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
5 Comments
  • Pravin Maheshkar says:
    April 29, 2017 at 7:07 am

    nice illustration through clear picture…

    Reply
  • Manikandan says:
    July 7, 2017 at 4:09 am

    This explanation shows your experience…

    Reply
  • Sai kiran says:
    February 9, 2019 at 10:28 am

    What happens if there is no flapper and pivot…

    Reply
  • Raed says:
    July 4, 2019 at 7:15 pm

    Many thanks

    Reply
  • Shahan Ahmed says:
    August 26, 2019 at 4:06 pm

    It’s a helpful site

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Rotary Stem Valves
Speed of Actuators
What is Poppet Valve? When we Use a Poppet Valve?
What is an Air Valve? Purpose, Types, Advantages, Disadvantages
Locked Open (LO) and Locked Closed (LC) Valves
Four Way Solenoid Valve Working Principle
How to Install a Control Valve?
Safety Relief Valve Quiz: Test Your Knowledge

Keep Learning

Control valve positioner calculation

Calculate Control Valve Stem Position

Solenoid Valve Design

Solenoid Valve Selection Criteria

Tilting Disk Check Valve Principle

What is Tilting Disk Check Valve ?

Shaft and Coupling Bore Tapers Repair Caused Frequent Shutdowns

Shaft and Coupling Bore Tapers Repair Caused Frequent Shutdowns

ON OFF Valve Parts

ON OFF Valve Preventive Maintenance and Testing Procedure

Basics of Butterfly Valves

noise-abatement trim

Control Valve Noise Problems

Common Valve Abbreviations

Common Valve Abbreviations in US Engineering Drawings

Learn More

Time Response Analysis

Steady-state Errors & Error Constants

Hysteresis - 2

Hysteresis

different flow measurement technologies

Different Flow Measurement Technologies

Synchronous Motor Principle

Synchronous Motors

Radiation Pyrometer Working Principle

Radiation Pyrometer Working Principle

Installation & Commissioning Tips for Wireless HART Devices

Installation & Commissioning Tips for HART Devices

Sensors and Transducers Objective Questions

Top 1000 Instrumentation Engineering Objective Questions

Custom CNC Machining Complete Guide

Custom CNC Machining – A Complete Guide You Cannot Miss

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?