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
  • Request
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: Simulate Different Values for Pressure Instrument Under Test
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
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Practical Questions > Simulate Different Values for Pressure Instrument Under Test

Simulate Different Values for Pressure Instrument Under Test

Last updated: June 3, 2020 12:10 pm
Editorial Staff
Practical Questions
No Comments
Share
2 Min Read
SHARE

One challenge technicians face when calibrating low-pressure instruments is how to generate very low air pressures to simulate different low-pressure conditions for the pressure instrument under test. Measuring low pressures is no problem at all: very simple manometers (or gauges) will do the job quite nicely.

Most mechanical air compressors, however, generate pressures far exceeding the range of most manometers. Though it is possible to purchase precision pressure regulators for reducing such large pressures down to a level measurable by a manometer, these devices are expensive.

Also Read: Pressure Gauge Testing

A simple way to “divide” the pressure output of a standard pressure regulator from a few PSI to a few inches of water is to use a pair of small valves (preferably needle valves allowing for precise adjustment) to throttle the flow of compressed air and vent the regulator’s output to atmosphere, then tap between those valves to obtain a reduced pressure:

calibrating low-pressure instrument

 

Draw an equivalent schematic diagram showing an electrical model for this pneumatic system, and then explain how it works:

electrical model for this pneumatic system

Share your explanation for the above equivalent circuit.

Questions for You:

1. Explain what you could do with one or both of the two needle valves to increase the amount of pressure sent to the instrument under test.

2. Explain why placing a valve in “series” with the regulator’s output will not adjust pressure to the instrument under test or the manometer.

needle valve for precise adjustment

 

Share your answers with us through below comments section.

Read Next:

  • What is Needle Valve
  • Series-Parallel Resistor Circuit
  • Questions on Control Valves
  • Instrument Air Manifold
  • Air Pressure Inside the Tank

Credits: Tony Kuphaldt

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

Determine Calibration Range of Pneumatic Pressure Transmitter
Programmable Logic Controller (PLC) Questions and Answers – 14
Programmable Logic Controller (PLC) Questions and Answers – 16
How Measurement Span of Pressure Gauge Could be Changed?
Flow Transmitter Readings mismatch with DCS
DP transmitter Elevated 10 Feet above the Vessel
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

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

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Paint Mixing System
Instrument Lab Exercise – Ranging and Manometer Usage
PLC Switch Actuation Status
How to Connect Proximity Switch (Source Type) to Make LED ON ?
Programmable Logic Controller (PLC) Questions and Answers – 13
Practical Process Control System Questions & Answers – 9
Determine the Temperature of 3 Wire RTD
Differential Capacitance Pressure Sensor Circuit

Keep Learning

A Question on Steam Drum Water Level Measurement

A Question on Steam Drum Water Level Measurement

Overhead Product Pressure Control Loop

Overhead Product Pressure Control Loop

Explain What these Spool Valve Represent

Explain What these Spool Valve Symbols Represent?

PLC Motor Control Circuit

Motor Trip Logic using PLC Programming

Two Differential Pressure Transmitters

Pressure Level Transmitter Problems

Stripping tower unit

Process Control High Level Alarm Fault Analysis

Differential Pressure Transmitter with 5 Way Manifold Valve

Differential Pressure Transmitter with 5 Way Manifold Valve

LRV and URV of PT for Extreme Limits of Empty and Full

LRV and URV of PT for Extreme Limits of Empty and Full

Learn More

Fixed Type Motor control center (MCC)

Motor Control Center (MCC) Signal Interface Termination (SIT)

Microprocessors Objective Questions

Microprocessors Objective Questions – Set 5

Instrumentation Commissioning

Commissioning Documents for Instrumentation Engineers

Mitsubishi PLC Programming Tutorials

Vibration Probe Field Setting Procedure

How to do calibration checks of vibration Probe, extension cable and vibration monitor

Instrumentation Engineering Root Cause Analysis

Instrumentation Engineering Problems Solved – Root Cause Analysis

COCO Simulator

COCO Simulator: Free Process Simulation Software

Difference between TCP-IP Model and OSI Model

Difference between TCP/IP Model and OSI Model

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

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?