Thermocouple measurement
Notice | |
Thermocouple basics The following sections assume that the reader is familiar with the contents of the chapter on "Fundamentals of thermocouple technology". |
Application to ELM334x
The terminal supports voltage measurement and conversion of various thermocouple types, see following list.
For voltage measurement, the specified electrical measuring range specified for the respective TC type is used.
Isolated (i.e. none earthed) thermocouple elements have to be used. If earthed thermocouple elements are used, it is to be expected that disturbances by the unclear earth potential will affect the measurement.
TC measuring range
In temperature mode, only the legacy range is available, the extended range is not available.
The temperature display in [°C/digit] (e.g. 0.1°/digit or 0.01°/digit) is independent from the electrical measurement. It is “just” a display setting and results from the PDO setting, see chapter "Comissioning".
TC types supported by the ELM334x:
- A-1 0...2500°C
- A-2 0...1800°C
- A-3 0...1800°C
- Au/Pt 0...1000°C
- B 200...1820°C
- C 0...2320°C
- D 0...2490°C
- E -270...1000°C
- G 1000...2300°C
- J -210...1200°C
- K -270...1372°C
- L -50...900°C
- N -270...1300°C
- P (PLII) 0...1395°C
- Pt/Pd 0...1500°C
- R -50...1768°C
- S -50...1768°C
- T -270...400°C
- U -50...600°C
The specification data for each type are listed below.