scope:

This Standard is applicable to pneumatic and electric industrial-process instruments using measured values that are continuous signals in accordance with current international standards. The other input value (i.e. the set point value) may be either a mechanical (position, force, etc.) or a standard signal. It should be noted that while the tests specified herein cover instruments having such measured values, they can be applied in principle to instruments having other continuous measuredvalues. These instruments may be used as controllers or as switches for alarm and other similar purposes. The following wordings and letter symbols are in accordance with the use as controllers and can be easily adopted for switches. Instruments with feedback are not covered by this standard.