delabs circuits
Electronic Engineering Schematics
Thermocouple and Pt-100 RTD
The easiest way to measure temperature is with a glass diode
like 1N4148 or a metal Transistor like 2N2222. These have a
small temperature range, probably -5 to +120 is possible, but
non-linear. A copper coil or any metal wire or even a wirewound
resistor can work as temperature sensor but the thermal inertia
makes it sluggish. Design
of a Thermocouple Amplifier
IC semiconductor based sensors like LM335 and AD590 are easy
to work with and pretty accurate. In industrial environment
many types of Thermocouples, Pt-100 RTD and Optical Infra-Red
Temperature measurements are used.
More at the Temperature
Measurement Section.
Temperature is the most important process parameter.
Measured, Displayed and Logged in home, industry and lab.
Semiconductor and IC Sensors, Thermocouples, Metal Wire-wound
Sensors, Pt-100 RTD, Thin Film RTD are used.
Input Levels for Thermocouples and RTD Pt-100. And
the ways it can be used. Thermocouples are selected on the
basis on how they are mounted or fixed, the environment, the
temperature range that is measured and finally the price. you
can afford for a particular application. Sometimes mechanical
wear or chemical environments may eat away the sensors, so a
cost-effective solution has to be evolved.
One customer wanted a special Pt-PtRh very high temperature
sensor for molten aluminum. It was very difficult and costly
to even arrive at a solution. So a non-contact infra-red
sensor may save a lot of time-money and even reduce risk of
injury.
12-Bit,
4-20mA Loop-Powered System
RTD Temperature Sensor
The image below is a collection of the types of RTD Pt-100 Sensor. Some are Small Filim based like the resistors. Some have a thin RTD Wire that measures upto 100E. Platinum is expensive so it has to be very thin, the construction is fragile and delicate process.
Once encapsulated in a metal or ceramic body, it is robust to
chemicals and vibration. Still need to take more care in
comparison to the rugged thermocouples that can manage
high-temperatures and mechanical shocks. RTD is ideal for
precision Low temperature control systems. Weather Monitors
and Fluid Temperature control.
Back to Electronic Tables and
Charts
...
...
...
...
...
delabs Technologies
20th May 2020
...
The documents, software, tools and links are provided to enhance the ability of an electronics student, hobbyist or professional by sharing information. The information, links etc. should be used by the website visitor, at his or her own risk and responsibility. There may be concept, design and link errors in the pages.
Creative Work, ideas and documents of delabs can be used for Product Design and Development by R&D Engineers, Hobbyists, Students and even firms for creating useful products. These cannot be used for reprint, replication or publishing online or offline.