Flow sensor

Caliber(mm)

Common flow rate (Qp)

Minimum flow rate (Qi)

Maximum flow rate (Qs)

DN15

1.5 m3/h

0.03 m3/h

3.0m3/h

DN20

2.5 m3/h

0.05 m3/h

5.0m3/h

DN25

3.5 m3/h

0.07 m3/h

7.0m3/h

Minimum display of flow rate: 0.01m3(working status)   0.00001m3(testing status)

Minimum display of heat power: 1kWh(working status)   0.001kWh(testing status)

Temperature sensor

Minimum temperature difference

1°C or 3°C

Maximum temperature difference

90°C

Minimum display temperature

0.1°C

Static working current

< 15μA

Battery service life

> 10 years

Digit number of LCD screen

8 number

Maximum accumulated working time

4.2x109 hours (Only final 8 number can be displayed when accumulated working time is more than 99999999 hours)

Maximum accumulated flow rate

4.2x109 m3 (Only final 8 number can be displayed when accumulated flow rate is more than 999999.99 m3)

Accuracy

Grade Ⅱ or Grade Ⅲ

Pressure resisting

1.6MPa

Loss of pressure

≤0.025MPa

Limiting level for alarm

1000kWh

Minimum unit for purchasing heat power

1kWh

The maximum communication distance between controller and heat meter

Open area: 100m; 50m for two walls