IEC 60982:1989

FOREWORD
PREFACE
Clause
1 Scope
2 Object
3 Definitions
  3.1 Definitions relating to the measuring method
      3.1.1 Level measuring systems utilizing ionizing
             radiation
      3.1.2 Transmission level measuring system
      3.1.3 Backscattering level measuring system
  3.2 Definitions relating to the apparatus
      3.2.1 Source assembly
      3.2.2 Detector assembly
      3.2.3 Measuring head
      3.2.4 Processing unit
      3.2.5 Movement device
      3.2.6 Air gap
      3.2.7 Total measuring path (transmission systems)
      3.2.8 Attenuation path (transmission systems)
  3.3 Definitions relating to specific apparatus properties
      3.3.1 Input quantity
      3.3.2 Limit values of the input quantity
      3.3.3 Contrast
      3.3.4 Resolution
      3.3.5 Switching difference
      3.3.6 Switching point
      3.3.7 Time behaviour
      3.3.8 Instability
      3.3.9 Statistical reliability
      3.3.10 Linearity
      3.3.11 Deviation due to movement
4 Test methods
  4.1 Testing system performance
      4.1.1 Type testing of the processing unit in the
             laboratory by electronic simulation or calculation
      4.1.2 Type testing of the measuring system by simulation
             of the medium to be measured by using absorbers
      4.1.3 On-site tests
  4.2 Errors due to application-related quantities

Applies to all systems which utilize ionizing radiation for continuous measurement or detection of the level of materials in vessels. The process material may be a liquid or a solid in the form of grains or powder. The systems covered by this standard are generally built for industrial applications covering a very broad range of industries, applications and specifications. Supersedes IEC 60346 (1971).