Disadvantages of Resistance Temperature Detectors
Resistance Temperature Detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions...
Home » Temperature Measurement » Page 2
Category : Temperature Measurement
Temperature Measurement
Important Factors for Thermocouple Selection
It would be difficult to chart a career course in the industrial process control field without being exposed to thermocouples. They are the ubiquitous basic temperature measuring tools with which...
What is Thermowell and How-to choose Thermowell Probe Length ?
The American Society for Testing and Materials (ASTM) has defined the term Thermowell as ” a closed end re-entrant tube designed for insertion of temperature sensing element, and provided with...
Why RTD installed after the Orifice Plate ?
Why RTD installed after the Orifice Plate ? The location of the RTD (thermowell), positioned downstream of the orifice plate so the turbulence it generates will not create additional turbulence...
Functions of Temperature Detectors
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,...
Bridge Circuit Construction
Figure 1 shows a basic bridge circuit which consists of three known resistances, R1, R2, and R3 (variable), an unknown variable resistor RX (RTD), a source of voltage, and a...
Thermocouple Construction
A thermocouple is constructed of two dissimilar metal wires joined at one end. When one end of each wire is connected to a measuring instrument, the thermocouple becomes a sensitive...
Resistance Temperature Detectors (RTD) Construction
The RTD incorporates pure metals or certain alloys that increase in resistance as temperature increases and, conversely, decrease in resistance as temperature decreases. RTDs act somewhat like an electrical transducer,...
Bimetallic Thermometer
A bimetallic strip is made up of metal A and B, having different thermal expansion co-efficient. It is bonded together. These thermometers use the following two principles: 1. All metals...
Helix Bimetallic Thermometer Principle
This article is a continuation of my previous post on Bimetallic Thermometer Principle of Helix Bimetallic Thermometer: When a bimetallic helix fixed at one end and free at the other...