Feb 16, 2021 10:30:00 AM

Thermocouple measurement with Beckhoff components: precise and fast

Temperatures need to be measured in almost every application. The commonest types of sensor for this are resistance sensors (RTD) and thermocouples (TC). Thermocouples can be used for the measurement of extremely high temperatures – well beyond the range of measurement with RTDs – and are also particularly sturdy, durable sensors.

In this webinar we show you how thermocouples work and which Beckhoff components can be used to record them. Our speaker Martin Podrouschek, Product Manager for Fieldbus Systems, guides you through the entire spectrum of requirements – from simple industrial applications to fast temperature changes, which you can nevertheless measure very accurately.

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EL3311 | EtherCAT Terminal, 1-channel analog input, temperature, thermocouple, 16 bit

EL3311 | EtherCAT Terminal, 1-channel analog input, temperature, thermocouple, 16 bit

The EL3311 analog input terminal allows thermocouples to be connected directly. The EtherCAT Terminal's circuit can operate thermocouple sensors using the 2-wire technique. Linearization over the full temperature range is realized with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3311 can also be used for mV measurement.

EL3312 | EtherCAT Terminal, 2-channel analog input, temperature, thermocouple, 16 bit

EL3312 | EtherCAT Terminal, 2-channel analog input, temperature, thermocouple, 16 bit

The EL3312 analog input terminal allows thermocouples to be connected directly. The EtherCAT Terminal's circuit can operate thermocouple sensors using the 2-wire technique. Linearization over the full temperature range is realized with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3312 can also be used for mV measurement.

EL3314 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 16 bit

EL3314 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 16 bit

The EL3314 analog input terminal allows four thermocouples to be connected directly. The EtherCAT Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3314 can also be used for mV measurement.

EL3314-0002 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, electrically isolated

EL3314-0002 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, electrically isolated

The EL3314-0002 analog input terminal allows the direct 2-wire connection of four thermocouples. The channels are electrically isolated from one another and from the E-bus, thus preventing interference and damage due to cross-currents. Various types of thermocouple are supported; the voltage is calculated in temperature directly in the terminal. The terminal can also be used for mV measurements. A broken wire is signaled by the error LEDs and on the fieldbus. Cold junction compensation takes place by means of precise internal temperature measurement at the connecting terminals, but operation with an external cold junction is also possible.

EL3314-0010 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision

EL3314-0010 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision

The EL3314-0010 analog input terminal allows four thermocouples to be connected directly. The EtherCAT Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal high-precision temperature measurement at the terminal. The EL3314-0010 can also be used for mV measurement.

EL3314-0030 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, externally calibrated

EL3314-0030 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, externally calibrated

The EL3314-0030 analog input terminal allows four thermocouples to be connected directly. The circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. Compensation for the cold junction is made through internal high-precision temperature measurement at the terminal. The EL3314-0030 can also be used for mV measurements.

EL3314-0090 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 16 bit, TwinSAFE SC

EL3314-0090 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 16 bit, TwinSAFE SC

The EL3314-0090 analog input terminal allows four thermocouples to be connected directly. The EtherCAT Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3314-0090 can also be used for mV measurement.

EL3318 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 16 bit

EL3318 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 16 bit

The EL3318 analog input terminal allows eight thermocouples to be connected directly and is thus particularly suitable for space-saving use in control cabinets. The EtherCAT Terminal circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. Compensation for the cold junction is made through an internal temperature measurement at the terminal. The EL3318 can also be used for mV measurement.

ELM3344-0000 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps

ELM3344-0000 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps

The 4- and 8-channel EtherCAT Terminals from the ELM334x economy series are designed for temperature measurement with thermocouples. All common thermocouple types are covered and, with a sampling rate of 1 ksps per channel, fast processes are also easy to record. The resolution is adjustable to 0.001°C. The channel properties can be adjusted individually for each channel via CoE. An exceptionally high measuring accuracy is achieved through the precise measurement of the internal cold junction.

ELM3348-0000 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps

ELM3348-0000 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps

The 4- and 8-channel EtherCAT Terminals from the ELM334x economy series are designed for temperature measurement with thermocouples. All common thermocouple types are covered and, with a sampling rate of 1 ksps per channel, fast processes are also easy to record. The resolution is adjustable to 0.001°C. The channel properties can be adjusted individually for each channel via CoE. An exceptionally high measuring accuracy is achieved through the precise measurement of the internal cold junction.

ELM3344-0003 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps, Mini-TC universal

ELM3344-0003 | EtherCAT Terminal, 4-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps, Mini-TC universal

The 4- and 8-channel EtherCAT Terminals from the ELM334x economy series are designed for temperature measurement with thermocouples. All common thermocouple types are covered and, with a sampling rate of 1 ksps per channel, fast processes are also easy to record. The resolution is adjustable to 0.001°C. The channel properties can be adjusted individually for each channel via CoE. An exceptionally high measuring accuracy is achieved through the precise measurement of the internal cold junction.

ELM3348-0003 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps, Mini-TC universal

ELM3348-0003 | EtherCAT Terminal, 8-channel analog input, temperature, thermocouple, 24 bit, high-precision, 1 ksps, Mini-TC universal

The 4- and 8-channel EtherCAT Terminals from the ELM334x economy series are designed for temperature measurement with thermocouples. All common thermocouple types are covered and, with a sampling rate of 1 ksps per channel, fast processes are also easy to record. The resolution is adjustable to 0.001°C. The channel properties can be adjusted individually for each channel via CoE. An exceptionally high measuring accuracy is achieved through the precise measurement of the internal cold junction.

ELM3702-0000 | EtherCAT Terminal, 2-channel analog input, multi-function, 24 bit, 10 ksps

ELM3702-0000 | EtherCAT Terminal, 2-channel analog input, multi-function, 24 bit, 10 ksps

The EtherCAT Terminals from the ELM series were developed in order to enable the high-quality measurement of common electrical signals in the industrial environment. Flexibly usable measurement modules are especially useful in laboratory and testing technology environments. Therefore the ELM370x multi-function modules feature an input circuit that can be set to over 30 different types of electrical connection via EtherCAT: from voltages of ±60 V to ±20 mV, thus supporting thermocouples and IEPE, a current of ±20 mA, a resistance measurement of 5 kΩ and thus also temperature RTDs (Pt100, etc.), measuring bridges and potentiometers, and all of this with a 2- to 6-wire connection, depending on the type. Thus, most electrical measuring tasks can be solved with just a single module. There is a choice of different connection types: The ELM3704-0001 with its high-quality LEMO connectors is mainly designed for laboratory use, where sensor configurations are changed on a daily basis, but a stable and reliable plug connection is nevertheless required. The 6-pin version with push-in (ELM3704-0000/ELM3702-0000) on the other hand is ideal for industrial use where a plug is unplugged less frequently for maintenance purposes and fast wiring is much more important.

ELM3704-0000 | EtherCAT Terminal, 4-channel analog input, multi-function, 24 bit, 10 ksps

ELM3704-0000 | EtherCAT Terminal, 4-channel analog input, multi-function, 24 bit, 10 ksps

The EtherCAT Terminals from the ELM series were developed in order to enable the high-quality measurement of common electrical signals in the industrial environment. Flexibly usable measurement modules are especially useful in laboratory and testing technology environments. Therefore the ELM370x multi-function modules feature an input circuit that can be set to over 30 different types of electrical connection via EtherCAT: from voltages of ±60 V to ±20 mV, thus supporting thermocouples and IEPE, a current of ±20 mA, a resistance measurement of 5 kΩ and thus also temperature RTDs (Pt100, etc.), measuring bridges and potentiometers, and all of this with a 2- to 6-wire connection, depending on the type. Thus, most electrical measuring tasks can be solved with just a single module. There is a choice of different connection types: The ELM3704-0001 with its high-quality LEMO connectors is mainly designed for laboratory use, where sensor configurations are changed on a daily basis, but a stable and reliable plug connection is nevertheless required. The 6-pin version with push-in (ELM3704-0000/ELM3702-0000) on the other hand is ideal for industrial use where a plug is unplugged less frequently for maintenance purposes and fast wiring is much more important.

ELM3704-0001 | EtherCAT Terminal, 4-channel analog input, multi-function, 24 bit, 10 ksps, LEMO

ELM3704-0001 | EtherCAT Terminal, 4-channel analog input, multi-function, 24 bit, 10 ksps, LEMO

The EtherCAT Terminals from the ELM series were developed in order to enable the high-quality measurement of common electrical signals in the industrial environment. Flexibly usable measurement modules are especially useful in laboratory and testing technology environments. Therefore the ELM370x multi-function modules feature an input circuit that can be set to over 30 different types of electrical connection via EtherCAT: from voltages of ±60 V to ±20 mV, thus supporting thermocouples and IEPE, a current of ±20 mA, a resistance measurement of 5 kΩ and thus also temperature RTDs (Pt100, etc.), measuring bridges and potentiometers, and all of this with a 2- to 6-wire connection, depending on the type. Thus, most electrical measuring tasks can be solved with just a single module. There is a choice of different connection types: The ELM3704-0001 with its high-quality LEMO connectors is mainly designed for laboratory use, where sensor configurations are changed on a daily basis, but a stable and reliable plug connection is nevertheless required. The 6-pin version with push-in (ELM3704-0000/ELM3702-0000) on the other hand is ideal for industrial use where a plug is unplugged less frequently for maintenance purposes and fast wiring is much more important.

EJ3318 | EtherCAT plug-in module, 8-channel analog input, temperature, thermocouple, 16 bit

EJ3318 | EtherCAT plug-in module, 8-channel analog input, temperature, thermocouple, 16 bit

The EJ3318 EtherCAT plug-in module allows the direct connection of eight thermocouples and is therefore particularly well suited to compact applications on the signal distribution board. The module's circuit can operate thermocouple sensors using the 2-wire technique. A microprocessor handles linearization across the whole temperature range, which is freely selectable. The error LEDs indicate a broken wire. The compensation for the cold junction is done by two RTDs (Pt1000), which can be placed anywhere on the signal distribution board. The EJ3318 can also be used for mV measurements.

EP3314-0002 | EtherCAT Box, 4-channel analog input, temperature, thermocouple, 16 bit, M12

EP3314-0002 | EtherCAT Box, 4-channel analog input, temperature, thermocouple, 16 bit, M12

The EP3314-0002 EtherCAT Box with analog inputs permits four thermocouples to be directly connected. The module’s circuit can operate thermocouple sensors using the 2-wire technique. Linearization over the full temperature range is realized with the aid of a microprocessor. The temperature range can be selected freely. The error LEDs indicate a broken wire. Compensation for the cold junction is made through a temperature measurement in the connecting plugs. This means that standard extension leads can be connected. The EP3314-0002 can also be used for mV measurement.

Measurement and testing technology

Measurement and testing technology

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