ITRON Axonic, Руководство пользователя, Страница: 3 / 76

3
Temperature Sensor
Temperature Sensor
Calculator
Flow Sensor
Supply
Return
3 - MOUNTING THE FLOW METER
3.1 - Operating conditions, materials and dimensions
The operating parameters of the heating or cooling circuit must not exceed, Maximal pressure (PMA), Operating tempera-
ture indicated on type plate.
• Max permanent operating temperature: version for heat 130°C/150°C (permanent/accidental); version for cooling 50°C
• PMA at extreme temperatures:
- PN16 120°C < Maximal pressure: 15.2 bar < 130°C
- PN25 120°C < Maximal pressure: 23.8 bar < 130°C
Minimum pressure to ovoid internal cavitation:
• DN65-100
- For fluid temperature < 90°C: minimum pressure = 1 bar
- For fluid temperature ≥ 90°C: minimum pressure = (minimum pressure to keep water at liquid state) + 1 bar
• DN150
- For fluid temperature < 90°C: minimum pressure = 2bar
- For fluid temperature ≥ 90°C: minimum pressure = (minimum pressure to keep water at liquid state) + 1,5 bar
Raw materials in contact with water:
• O-Ring: EPDM (channel) & FKM
• Bodies: Bronze (PN16 and 25), stainless steel (PN40).
• Transducer support: brass plated (PN16 and 25), Stainless steel (PN40)
• Measurment Channel, Stabilizer: Thermoplastic
• Membrane: stainless steel
Pressure loss: at qp/50°C (bar):
• DN65
< 0.10 bar
• DN80 < 0.17 bar
• DN100 < 0.13 bar
• DN150 < 0.15 bar
2.4 - Application
The flow meter Axonic is a sub-assembly for a thermal energy measurement systems that consists of flow meter, calculator
(e.g. Itron CF51, CF55, CF800) and a pair of temperature sensors. Calculator input specifications and flow meter output
specification must be compliant in order to ensure correct energy measurement, this concerns in particular flow meter
pulse-weight (L/pulse) and flow meter position (return or supply pipe).