NEN EN 834 : 2013 C1 2015

Committees responsible
National foreword
Foreword
1. Introduction
2. Scope and general terms
3. Functional principle and measuring methods
4. Definitions
4.1 Reference condition
4.2 Reference counting rate
4.3 Temperature sensors
4.4 Measuring range of temperature sensors
4.5 Design flow temperature, design return temperature,
      mean design heating medium temperature
4.6 Upper temperature limit
4.7 Lower temperature limit
4.8 Start temperature
4.9 Displayed reading
4.10 Rated displayed reading
4.11 Counting rate
4.12 Nominal meter characteristic
4.13 Relative display deviation
4.14 Idle counting rate
4.15 Measuring period
4.16 c-value
4.17 Full utilization period
4.18 Rating factors
4.19 Transmission systems
4.20 Manufacturer
5. Requirements for the heat cost allocators
5.1 Requirements concerning temperature stress
5.2 Storage temperature
5.3 Start temperature
5.4 Idle counting rate
5.5 Temperature sensors
5.6 Calculator/central unit
5.7 Auxiliary power supply
5.8 Overflow of the display
5.9 Resolution of the display
5.10 Function check
5.11 Maximum permissible errors
5.12 Ageing
5.13 Electrical, electrostatic and magnetic influences
5.14 Thermal influence on heat cost allocators operating
      on the single sensor principle
5.15 Thermal influence on heat cost allocators with a
      room temperature sensor
5.16 Thermal influence on other parts and components
5.17 Influence on transmission systems
5.18 Sealing
6. Requirements for use and installation
6.1 Temperature limits
6.2 Installation of sensors
6.3 Installation position of the sensors
6.4 Wire and signal cable installation
6.5 Conformity of instruments
7. Requirements for the rating
7.1 Resulting rating factor K
7.2 Rating factor KQ
7.3 Rating factor KC
7.4 c-value
7.5 Rating factor KT
8. Requirements for maintenance and reading
9. Testing
9.1 General
9.2 Test documents
9.3 Test report
9.4 Test protocols
10. Test procedures
10.1 Construction
10.2 Sealing
10.3 Temperature durability
10.4 Maximum permissible errors
10.5 Ageing
10.6 External influences
10.7 c-values, test procedure
10.8 c-values, test range
10.9 Rating factor KQ
10.10 Rating factor KC
11. Marking
Annex A (informative) Information and recommendations
A.1 Heating systems
A.2 Recommended field of application
A.3 Heat emission not controllable by the consumer
A.4 Additional corrections
Annex B (informative) Bibliography