NEN EN 1434-2 : 2015

Foreword
1 Scope
2 Normative references
3 Temperature sensors
    3.1 General
    3.2 Mechanical design
          3.2.1 Materials of temperature probe sheath
                  and pocket
          3.2.2 Dimensions of direct mounted short
                  probes (Type DS)
          3.2.3 Dimensions of direct mounted long
                  probes (Type DL)
          3.2.4 Dimensions of direct mounted long
                  probes (Type PL)
          3.2.5 Dimensions of temperature pocket
          3.2.6 Design of short probes with respect to
                  installation
          3.2.7 Design of long probes with respect to
                  installation
    3.3 Platinum temperature sensor
          3.3.1 Specialized definitions for 2-wire
                  temperature probes
          3.3.2 Resistance characteristics
          3.3.3 Signal leads
          3.3.4 Temperature sensors for the 2-wire
                  method
          3.3.5 Temperature sensors for the 4-wire
                  method
          3.3.6 Thermal response time
    3.4 Other temperature sensors
4 Flow sensors
    4.1 Maximum admissible working pressure, MAP
    4.2 Sizes and dimensions
    4.3 Test signal output
    4.4 Adjusting device
5 Calculators
    5.1 Mechanical dimensions for calculators for
          domestic use
    5.2 Terminals - specification and identification
          5.2.1 Terminals for signal leads
          5.2.2 Terminals for connection to the mains
                  supply
    5.3 Batteries
    5.4 Dynamic behaviour
    5.5 Test signal output
    5.6 24 hours interruption in supply voltage
6 Complete meter
7 Interfaces between sub-assemblies
    7.1 Definitions for pulse device interfaces
          7.1.1 Electrical connection
          7.1.2 Classification of pulse output devices
          7.1.3 Timing and electrical parameters for pulse
                  output devices (other than test signals)
          7.1.4 Classification of pulse input devices
          7.1.5 Timing and electrical parameter for pulse input
                  devices
          7.1.6 Compatibility
8 Marking and security seals
    8.1 Marking
          8.1.1 Temperature sensor pairs
          8.1.2 Flow sensor
          8.1.3 Calculator
          8.1.4 Complete meter
    8.2 Sites for marking
    8.3 Security seals
Annexes
A (informative) - Examples of temperature sensors
B (normative) - Input and output test signals
C (informative) - Low voltage power supply for heat meters
                    and their sub-assemblies
Figures
Tables

Defines the constructional requirements for heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid.