Basic Overview of ET200 SP HA

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The high-performance I/O system SIMATIC ET 200SP HA – perfectly matched to the requirements of the process industry and with clear advantages wherever ruggedness and maximum availability are important in the process and manufacturing industry. Benefits Availability: Redundancy at the PROFINET interface (S2 or R1) Hot swapping during runtime station expansion possible during runtime Easy to Use: Compact modules with permanent wiring. One terminal block for all 24 V standard signals Tool-free connection system with push-in-terminals Compact Design Compact with up to 56 i/o modules per station High concentration of up to 32 channels on a module that is only 22.5 mm wide System-integrated power bus Seamless integration in SIMATIC PCS new PROFINET IO communication standard Functions Main functions Compact I/O modules Up to 32 channels on a module that is 22.5 mm wide Up to 56 modules per station Perfectly suited for applications in the field Installation up to hazardous zone 2 Extended temp
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Difference Between Thermocouple and RTD

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What is the Difference between thermocouple and RTD?

The most notable difference between a thermocouple and an RTD (Resistance Temperature Detector) is the principle of operation.

  •  A thermocouple operates on the principle that two dissimilar metals joined together will produce a voltage related to a temperature difference. An RTD operates on the principle that electrical resistance of certain metals changes in a predictable way depending on the rise or fall in temperature.
  • Advantages of the thermocouple include a wide temperature measuring range (depending on the thermocouple type the range can be as much as from -300°F to 2300°F), fast response time (under a second in some cases), low initial cost, and durability. Overall, thermocouples are able to withstand rugged applications.  
  • Advantages for RTDs include stable output over a long period of time, ease of recalibration, and accurate readings over narrow temperature spans. Disadvantages, when compared to the thermocouples, are: smaller overall temperature range (-330°F to 930°F), higher initial cost and they are more fragile in rugged, industrial environments.

  • Thermocouples are inexpensive, rugged, and have a fast response time but are less accurate and the least stable and sensitive.  Thermocouples also read only relative temperature difference between the tip and the leads while RTD's and Thermistors read absolute temperature. RTD's are the best choice for repeatability, and are the most stable and accurate.  However they have a slow response time and because they require a current source they do have a low amount of self heating.  Thermistors have a fast output and are relatively inexpensive but are fragile and have a limited range.  They also require a current source and do experience more self heating than an RTD and are nonlinear.



Criteria

Thermocouple

RTD

Thermistor

Temp Range

-267°C to 2316°C

-240°C to 649°C

-100°C to 500°C

Accuracy

Good

Best

Good

Linearity

Better

Best

Good

Sensitivity

Good

Better

Best

Cost

Best

Good

Better  



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