Temperature measurement using sensors and signal conditioning
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Temperature Measurement using sensors and signal conditioning. Michael Mansell Ken Dudeck (Faculty Sponsor). Topics of Discussion. Types of temperature sensors The CK101 LCD Temperature Meter Our circuit design. Types of temperature sensors. RTD (Resistance Temperature Detector)

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Temperature measurement using sensors and signal conditioning

Temperature Measurement using sensors and signal conditioning

Michael Mansell

Ken Dudeck (Faculty Sponsor)


Topics of discussion
Topics of Discussion conditioning

  • Types of temperature sensors

  • The CK101 LCD Temperature Meter

  • Our circuit design


Types of temperature sensors
Types of temperature sensors conditioning

  • RTD (Resistance Temperature Detector)

  • Thermistor

  • Thermocouple


Rtd the basics
RTD, the basics conditioning

  • How it works:

    • Utilizes the fact that resistance of a metal changes with temperature.

  • Make up:

    • Traditionally made up of platinum, nickel, iron or copper wound around an insulator.

  • Temperature range:

    • From about -196°C to 482°C.

Thin Film RTD


Rtd advantages and disadvantages

Advantages: conditioning

Stable

Very accurate

Change in resistance is linear

Disadvantages:

Expensive

Current source required

Small change in resistance

Self heating

Less rugged than thermocouples.

RTD Advantages and Disadvantages


Thermistor the basics of
Thermistor, the basics of conditioning

  • How it works:

    • Like the RTD a thermistor uses the fact that resistance of a metal changes with temperature.

  • Make up:

    • Generally made up of semiconductor materials

  • Temperature Range:

    • About -45°C - 150°C

Thermistor


Thermistor advantages and disadvantages

Advantages: conditioning

Very sensitive (has the largest output change from input temperature)

Quick response

More accurate than RTD and Thermocouples

Disadvantages:

Output is a non-linear function

Limited temperature range.

Require a current source

Self heating

Fragile

Thermistor Advantages and Disadvantages


Thermocouple some more basics
Thermocouple, some more basics conditioning

  • How it works:

    • Made up of two different metals joined at one end to produce a small voltage at a given temperature.

  • Make up:

    • Made of up two different metals. Ex: A type J is made up of Iron and Constantan.

  • Temperature Range

    • Type J: 0°C to 750°C

A few Thermocouples


Thermocouple advantages and disadvantages

Advantages: conditioning

Self Powered (does not require a current or voltage source)

Rugged

Inexpensive

Simple

Disadvantages:

Extremely Low Voltage output (mV)

Not very stable

Needs a reference point

Thermocouple Advantages and Disadvantages


Lets experiment
Lets Experiment! conditioning

  • In lab a RTD, thermistor, and thermocouple were placed in a beaker of 750mL of water and readings were taken from 19°C to 80°C.

  • The next two slides show the results.


The data some of it
The Data (some of it) conditioning



First test subject the kit ck101
First test subject (The Kit CK101) conditioning

  • Basically the same idea as our circuit design, but easier?

  • How it works

  • Why it did not work

CK101 LCD Temperature Sensor


How it works and what went wrong
How it works and what went wrong conditioning

  • Uses transistors instead of the other discussed sensor types.

  • Uses the ICL 7106 chip

  • Problems:

    • Possible Bad chip

    • Capacitors not soldered in properly.

    • Cold solder joins leading to bad connections


Our design

Our design conditioning

It works!


Picture
Picture conditioning


Another picture
Another Picture conditioning


Circuit diagram
Circuit Diagram conditioning



My sources
My Sources conditioning

  • Omega.com (Info on RTDs and Thermistors) http://www.omega.com/

  • United Electric Controls (Thermocouple, RTD, and Thermistor info) http://www.ueonline.com/

  • Intersil (ICL 7106 Chip reference) http://www.intersil.com/