1 Scope
2 Normative reference
3 Definitions
4 Procedure for specification
  4.1 Additional statements on sensor units and
      analyzers
  4.2 Additional statements on electronic units
  4.3 Statements on sensors
      4.3.1 General
      4.3.2 Reference electrodes
      4.3.3 pH sensor
      4.3.4 Temperature compensator
      4.3.5 Auxiliary devices for sensor unit
5 Recommended standard values and ranges of influence
  quantities affecting the performance of electronic
  units
6 Verification of values
  6.1 General aspects
  6.2 Test procedures for electronic units
      6.2.1 pH scaling
      6.2.2 Isopotential pH, pH[i]
      6.2.3 Temperature compensation
  6.3 Test procedures for sensor units
      6.3.1 Zero point pH
      6.3.2 Percentage theoretical slope
      6.3.3 Isopotential pH, pH[i]
  6.4 Test procedures for analyzers
      6.4.1 Intrinsic uncertainty
      6.4.2 Linearity uncertainty
      6.4.3 Repeatability
      6.4.4 Output fluctuation
      6.4.5 Warm-up time
      6.4.6 Drift
      6.4.7 Response times
      6.4.8 Sample temperature
      6.4.9 Primary influence quantities
Annex A (informative)
Annex B (informative) Reference buffer solutions; pH
        as a function of temperature
Annex C (normative) Alternative procedures for
        measuring response times: delay (T[10]), rise
        (fall) (T[r], T[f]) and 90 % (T[90]) times
Annex ZA (normative) Normative references to
         international publications with their
         corresponding European publications
Bibliography