dpstar is one of the largest manufacturer and supplier of Temperature/ Thermocouple probes.
No matter the application dpstar has a probe for you: penetration probes,air probes,surface probes,air probes and probes for oil and gas use.
Temperature probes are devices used to measure temperature using contact-style sensing methods and it can be classified by their sensor technology or probe configuration.
There are three main types of temperature sensors used in probes.
Thermocouple temperature probes are devices that generate a temperature-dependent voltage. The wires are joined at one end to form a measuring junction within a casing. To measure temperature, the probe is inserted into the fluid or medium and a voltage is generated. In one-junction designs, the voltage is measured directly by the incorporated measuring device to interpret the corresponding temperature. In two-junction designs, the other end of the wires is terminated within a reference probe at a known temperature, and the voltage difference between the two junctions is measured to determine the temperature of the measured system. Thermocouples are generally simple, rugged and cover a wide temperature range.
Resistive temperature detectors (RTD’s) are types of thermal resistors – wire windings that exhibit changes in resistance with changes in temperature. The hotter they become, the higher the value of their electrical resistance. Platinum is the most commonly used material because it is nearly linear over a wide range of temperatures, is very accurate, and has a fast response time. RTDs can also be made of less expensive metals like copper or nickel, but these materials have restricted ranges and problems with oxidation. RTD elements are usually long, spring-like wires surrounded by an insulator and enclosed in a sheath of metal. When platinum is used, they are very linear and accurate, but are typically more expensive than other temperature detection methods.
Thermistor temperature probes are another type of thermal resistor. They tend to exhibit a nonlinear relationship between resistance and temperature – large changes in resistance are proportional to small changes in temperature. There are two types of thermistors: negative temperature coefficient (NTC), where the resistance drops with a rise in temperature; and positive temperature coefficient (PTC), where the resistance increases as the temperature rises.
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