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: RTD Standards
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 > Standards > RTD Standards

RTD Standards

Last updated: January 13, 2019 9:49 am
Editorial Staff
Standards Temperature Measurement
1 Comment
Share
2 Min Read
SHARE

RTD Standards

A resistance temperature detector or platinum resistance thermometer works on the principle that the electrical resistance of a metal changes in a significant and repeatable way when temperature changes. This resistance is inversely proportional to cross sectional area and proportional to length.

Platinum is the most widely used metal for resistance temperature detection due to the following characteristics:

  1. chemical inertness
  2. a temperature coefficient of resistance that is large enough to give readily measurable resistance changes with temperature
  3. an almost strain free fabrication metal (in that resistance doesn’t drastically change with strain)
  4. an almost linear relation between resistance and temperature

Each resistance versus temperature relation for an RTD is qualified by a term known as “alpha”. “Alpha” is the slope of the resistance between 0°C and 100°C. This is also referred to as the temperature coefficient of resistance, with the most common being 0.00385 Ω/Ω/°C.

Other types of RTD’s manufactured include copper, nickel and nickel alloys.

The amount of resistance of an individual RTD bulb (100Ω, 200Ω, etc.) is determined by the amount of metal between the terminal points and by the configuration of the element.

When ordering an RTD, the alpha and resistance value at 0°C (i.e.: Ro) must be specified to match the measuring instrumentation used with the RTD.

The RTD standard must also be specified. There are several RTD standards set by various organizations. These specifications are not identical and read out instrumentation must be adjusted for the specific standard of the RTD used with that equipment.

Differences in the alpha values of these standards can cause errors in measurement of an RTD if one standard is connected to the instrumentation of another standard.

The following chart indicates some common RTD standards.

RTD Standards

RTD Element Types 

RTD ELEMENT TYPES

Reference : gilsoneng.com

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

Thermocouple Temperature Range Questions and Answers
Basic Temperature Sensors MCQ Questions Answers
Why Thermocouple Reference Junction Compensation Required ?
What is a Four-wire RTD ?
Resistance Temperature Detectors Working Principle
Skin Type Thermocouple
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
1 Comment
  • Jatin Katrodiya says:
    January 24, 2020 at 1:51 pm

    In general when we are at the field and does not have RTD table (i.e. Resistance vs temperature).

    The general rule of thumb to know the temperature (in deg C) is 2.5 times the (actual resistance – 100) ohm.

    E.g. 125 ohm is measured by RTD, then the temperature would be

    ===> 125-100 = 25
    ====> double the 25 => a) 50
    ====> half the 25 =>b) 12.5

    Result is a)+b) ==>50+12.5 = ~ 62.5 Deg C would be the actual temperature.

    To be very precise it would be 2.59 times the (actual resistance – 100) ohm.

    Reply

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

Thermocouple Questions and Answers
RTD Calculator : Calculate Temperature from Resistance
Hazardous Area Classification Questions
Ingress Protection Rating
Temperature Controller Problem
How 3 Wire RTD Lead Wire Resistance Eliminated?
IP Ratings and Equivalent NEMA Ratings
Calibration of Pyrometers using Black Body

Keep Learning

Thermocouple Law of Intermediate Metals

Thermocouples Law of Intermediate Metals

RTD

Why 4 wire RTD Measurement Accuracy is better than 2 and 3 wire RTD?

How to Test a Thermocouple with a Multimeter

Testing a Thermocouple With a Multimeter

Thermowell Wake Frequency Calculation

Thermowell Wake Frequency Calculation

Temperature Gauges and Elements Specifications

Temperature Gauges and Elements : Detailed Specifications

Thermocouple Testing

Thermocouple Cold Junction Compensation

Thermocouple Software compensation

Thermocouple Software compensation

Disadvantages of Resistance Temperature Detectors (RTD)

Disadvantages of Resistance Temperature Detectors

Learn More

Auto Cane Feed Control System using DCS

Auto Cane Feed Control System using DCS – Sugar Factory

Difference Between LED and LDR

Difference Between LED and LDR

Quality Control Inspector Questions

Quality Control Inspector Interview Questions and Answers

pressure switches relay circuit

Determine the functions of Pressure Switches ?

Single Phase Motor Manual Controller

Motor Controllers

Resistance Temperature Detectors Errors

Resistance Temperature Detectors (RTD) Sources of Error

Moving Magnet type Velocity Transducer

Moving Magnet Type Velocity Transducer

% of Reading vs. % of Full Scale Accuracy

% of Reading vs. % of Full Scale Accuracy

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?