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: Functions of Temperature Detectors
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 > Temperature Measurement > Functions of Temperature Detectors

Functions of Temperature Detectors

Last updated: May 23, 2018 9:47 am
Editorial Staff
Temperature Measurement
No Comments
Share
3 Min Read
SHARE

Functions of Temperature Detectors

Although the temperatures that are monitored vary slightly depending on the details of facility design, temperature detectors are used to provide three basic functions: indication, alarm, and control. The temperatures monitored may normally be displayed in a central location, such as a control room, and may have audible and visual alarms associated with them when specified preset limits are exceeded. These temperatures may have control functions associated with them so that equipment is started or stopped to support a given temperature condition or so that a protective action occurs.

Detector Problems

In the event that key temperature sensing instruments become inoperative, there are several alternate methods that may be used. Some applications utilize installed spare temperature detectors or dual-element RTDs. The dual-element RTD has two sensing elements of which only one is normally connected. If the operating element becomes faulty, the second element may be used to provide temperature indication. If an installed spare is not utilized, a contact pyrometer (portable thermocouple) may be used to obtain temperature readings on those pieces of equipment or systems that are accessible.

If the malfunction is in the circuitry and the detector itself is still functional, it may be possible to obtain temperatures by connecting an external bridge circuit to the detector. Resistance readings may then be taken and a corresponding temperature obtained from the detector calibration curves.

Environmental Concerns

Ambient temperature variations will affect the accuracy and reliability of temperature detection instrumentation. Variations in ambient temperature can directly affect the resistance of components in a bridge circuit and the resistance of the reference junction for a thermocouple. In addition, ambient temperature variations can affect the calibration of electric/electronic equipment. The effects of temperature variations are reduced by the design of the circuitry and by maintaining the temperature detection instrumentation in the proper environment.

The presence of humidity will also affect most electrical equipment, especially electronic equipment. High humidity causes moisture to collect on the equipment. This moisture can cause short circuits, grounds, and corrosion, which, in turn, may damage components. The effects due to humidity are controlled by maintaining the equipment in the proper environment.

Detector Uses Summary

1.Temperature detectors are used for:

  • Indication
  • Alarm functions
  • Control functions

2.If a temperature detector became inoperative:

  • A spare detector may be used (if installed)
  • A contact pyrometer can be used

3.Environmental concerns:

  • Ambient temperature
  • Humidity
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

Thermocouples Burnout detection
What is a Thermocouple ?
Filled-bulb Temperature Sensors
RTD Calculator : Calculate Resistance from Temperature
Different Types of Thermometers
Temperature Sensor calibration procedure
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

Pyrometers Handbook
What is RTD Sensitivity ?
How to Install Thermowell on an Elbow?
Why RTD installed after the Orifice Plate ?
Free Download Thermocouple Calculator
Calibration of Temperature Sensor with Indicator
Pneumatic Temperature Transmitter with Sensor Principle
How to Convert 2 wire RTD into 3 or 4 wire RTD?

Keep Learning

thermal imaging instrument

Thermal Imaging Temperature Measurement

Three Wire RTD Wheatstone bridge Circuit

RTD Wheatstone Bridge Circuits

Temperature Switch Working

Basics of Temperature Switch

Temperature Transmitter Formula

Calculate Temperature Transmitter Output

Radiation Pyrometer Working Principle

Radiation Pyrometer Working Principle

Formula of 2 Wire RTD, 3 Wire RTD & 4 Wire RTD

Formula of 2 Wire RTD, 3 Wire RTD & 4 Wire RTD

Multiple Position Calibration of Temperature Chamber (Mapping)

Multiple Position Calibration of Temperature Chamber

Temperature Transmitter with Thermocouple

Thermocouple Extension and Compensating Cables

Learn More

Leading Power Factor

Power Factor

Electrical Machines Questions and Answers

Salient Pole Machines Quiz

AC Generator Operation

AC Generator Theory

Miniature Circuit Breakers Questions and Answers

Miniature Circuit Breakers Questions and Answers

Fan Motor Frequent Journal Bearing Failures

Fan Motor Frequent Journal Bearing Failures Posed Plant Outages

Design Process Control & Safety Systems

Design View of Supplying Process Control and Safety Systems

liquid flow control system

Practical Process Control System Questions & Answers – 7

Installation of a Control Valve

How to Install a Control Valve?

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?