Resistance thermometers are an innovative type of temperature sensor that track thermal energy as a function of electrical resistance. To do this, a pure metal element is required. This element is usually copper (Cu) or platinum (Pt), with a proportional and precise relationship between electrical resistance and temperature.
Resistance thermometers operate similarly to a typical thermocouple. They obtain thermal energy from a process environment and relate the signal to a transmitter. This information can be seen in the field with a head-mount display, or it can be retrieved downstream using other interfaces.
The main difference is that resistance thermometers make use of the repeatable resistance against temperature relationship of the metal elements to measure differences in temperature. Copper and platinum show strong linearity regarding this relative alteration in resistance. As a result, resistance thermometers can be utilized to measure temperature changes across a wide range with very high precision.
Multi-resistance thermometers work on the same principle. However, they use multiple wiring materials. Stainless steel or nylon sheaths contain several metallic elements made from varying materials to different lengths. These elements stretch along the entirety of the sheath that is made to alleviate possibly destructive environmental and mechanical factors that harbor the potential to cause dimensional changes to the wiring.
One of the chief applications of multi-resistance thermometers is their use in averaging the temperatures of processes and containers over time. Each element can be adjusted for high, low, and mid-point temperatures to ensure accuracy across wide temperature ranges. The technology has become vital in custody transfer metering systems and tank monitoring when fluidic hydrocarbons are being stored. However, there is a wide array of applications for multi-resistance thermometers additional to this.
MRT Products from TT Electronics
TT Electronics enjoys unparalleled knowledge in the process monitoring field and advanced electronics for industrial use. Our DS2101 series of multi-resistance thermometers are perfect for true temperature averaging in challenging application areas. The hard-wearing, sag-free housing is appropriate for harsh and corrosive environments and is ATEX directive and EN50014 standards certified. Copper and platinum elements inside the highly stable sheath have an electrical resistance of 100 ohms at either 0°C or 25°C (77°F).
The DS2101 is compatible with several industry-standard level gauges, guaranteeing ideal integration with each system and enhanced process monitoring from the point of installation onwards.
This information has been sourced, reviewed and adapted from materials provided by TT Electronics plc.
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