The DAF E-ITN 30.4 heat cost allocator device is designed to distribute the heat costs of buildings with a central heating system among the apartment owners according to the consumption. The heat cost allocator devices, mounted on each radiator, record the consumption value of the radiator ve allows the allocation of the heat costs of the apartments according to their consumption values.
The heat cost allocator measures the surface temperature of each radiator with a heat sensor which is in contact with the surface and manipulation protected. And measures with the heat sensor on the front side the room temperature and calculates consumption value based on the difference between these two values.
The real consumption value is calculated by using this measurement value and the thermal and the thermal power coefficient of the radiator and the contact coefficient between the cost allocator and the radiator*.
* Detailed information can be found in the TS EN 834 standard.
Technical Specifications |
|
Record start |
When the radiator heat sensor reads ≥23˚C and when the difference between the radiator and room temperature is ≤5K |
Calendar function |
Recorded monthly measurements up to the past 11 months and the measurements of the year before |
Power supply |
3.6 V Lithium battery |
Battery lifetime |
10 years + 1 year reserve |
Display |
5 digit LCD display + 2 special characters |
Protection against manipulation |
|
Minimal environment design-radiator temperature (tmin) |
35˚C |
Maximal environment design-radiator temperature (tmaks) |
90˚C |
Protection class |
IP42 |
Data recorder |
EEPROM microprocessor |
Function control |
Automatic, able to be activated and controlled externally |
Monting location |
At 75% of the radiator height and centre of the radiator width (50%) |
European standard |
DIN EN 834 |
Reading |
|
Material |
|
Dimensions |
100x37x33 mm |
Transmission capacity |
<5 mW |
Transmitter frequency |
868 MHz |
Transmission time |
<8 ms |
Transmission frequency |
30-36 sec. during the first 3 days of each month, 240-246 sec. during the remaing days of the months. |