NE 89 has been revisedfrom 2019-06-11
The document differs from NE 89 edition 2009-01-27 beside editorial adjustments as follows:
- Separation in German and English versions
- Change of wording
- Modification of members and responsibilities
- Modification of target definition, abolition of industry definition
- Revision of relevant standards
- Specification of behavior in case of an error
- Addition in regard to the diagnostic function requirements
- Cancellation of requirements in the chapter maintenance
Abstract NE 89 ‘Temperature Transmitter with Digital Signal Processing’
This NAMUR Recommendation applies to electrical temperature transmitters with digital signal processing.
Digital signal processing in temperature transmitters offers several possibilities, but challenges as well. The aim of this NAMUR Recommendation is to draw attention to certain problems and to describe the requirements of the process industry.
Electrical temperature transmitters register and check the plausibility of the electric measurement signal delivered by a temperature sensor and convert it into a standardized output signal. In addition, they supply information in standardized form describing the quality of the measurement signal.
In digital transmitters the analog signal coming from a sensor is converted into a digital signal by an analog/digital converter and then processed in a programmed microprocessor. At the output the signal is either converted by a digital/analog converter into a standardized analog output signal or emitted in digital form via a standardized field bus protocol.