Mechanical heat meters are welcome to purchase, with low prices and good quality

The main control parameters selected for mechanical heat meters are: nominal diameter DN, common flow rate, maximum flow rate, minimum flow rate, rated pressure, maximum pressure loss, temperature range, temperature difference range, etc

The main control parameters selected for mechanical heat meters are: nominal diameter DN, common flow rate, maximum flow rate, minimum flow rate, rated pressure, maximum pressure loss, temperature range, temperature difference range, etc.

2. Mechanical flow sensors measure the flow rate of the heat medium by measuring the rotational speed of the impeller. Classified by size, it can be divided into two categories: small caliber (≤ 40mm) and large caliber (≥ 50mm). According to the internal structure classification, small-diameter flow sensors are divided into single beam and multi beam types, among which the single beam type has a shorter impeller life due to uneven water flow impact. Large caliber is divided into two types: horizontal spiral wing type and vertical spiral wing type. The former can be installed horizontally or vertically, while the latter can only be installed horizontally.

According to whether the counter of the flow sensor is in contact with hot water, it can be divided into two types: dry and wet. The impeller speed of dry sensors is usually transmitted to the counter through magnetic coupling. Wet sensors are transmitted through mechanical connections, where the entire counter is immersed in water (such as a cold water meter).

4. The initial investment for mechanical heat meters is relatively low. To prevent the rotating parts of the flow sensor from being blocked, the flow sensor of the heat meter has certain requirements for water quality.

5. The specification selection of flow sensors should not be simply based on the diameter of the pipeline connection, but should be selected according to the commonly used flow rate of the heat meter and the flow range under the working conditions of the heat meter.

The minimum flow rate of the heat meter should be less than the minimum flow rate of the measured load; The maximum flow rate of the heat meter should be greater than the maximum flow rate of the measured load; The commonly used flow rate of a heat meter should be close to the rated flow rate being measured; The rated pressure of the heat meter should match the measured system pressure.

7. Select a heat meter with the corresponding accuracy level and quality according to the application function requirements of the heat meter (such as household meter, building meter, heat source meter, etc.).

8. The accuracy of the heat meter used for heat cost settlement should be higher than level 3, and it should have the remote transmission function of heat metering data and the storage performance of daily heat supply for more than 180 days.

When using a split type heat meter, the distance between the integrator and the flow sensor should not exceed 10m.

2. Installation of flow sensors

1) The flow sensor for the heat meter can be installed on both the heating supply and return pipes. Installing on the return pipe can extend its service life.

2) The flow sensor for a heat meter should be installed on a pipeline with a diameter equal to its nominal diameter, and a straight pipe section of a specified length should be set at the front and rear ends respectively (provided by the product sample, generally there should be a straight pipe section of 6-12 times the nominal diameter in front of the meter).

3) When installing flow sensors, consideration should be given to leaving space for easy reading and maintenance.

4) When installing a flow sensor, attention should be paid to the direction of water flow and isolation valves should be installed before and after the flow sensor.

5) The flow sensor should be installed on a horizontal pipe with the meter head facing vertically upwards; A filter should be installed at the front end of the flow sensor.

3. Installation of temperature sensor

1) The temperature sensor must be installed outside the straight pipe section specified by the flow sensor; The water temperature at the pipeline where the temperature sensor is installed must be uniform. When installing a temperature sensor on the same pipe as the flow sensor (supply pipe or return pipe), it is best to install it at the rear end (downstream) of the flow sensor;

2) The temperature sensor should not be installed at a higher position in the pipeline (which may not be filled with liquid), and should be kept at a certain distance d from the nearest possible diversion point (to avoid uneven water temperature). The size of the d value should be provided by the manufacturer.

3) The depth of insertion of the temperature sensor into the pipeline should be determined based on the principle that the thermal sensing element is located at the center and slightly below the pipeline.

4) It is advisable to install another sheath near the sheath of the temperature sensor for inserting the standard thermometer used for detection.

4. Installation of integrator

1) The ambient temperature at the location of the integrator cannot exceed the temperature range indicated by the manufacturer.

2) The connecting wires, cables, and connection methods between the integrator and various components shall be in accordance with the manufacturer's specifications.

3) If the integrator requires an external power supply, it must comply with the requirements of the electrical parameters and wiring diagram provided by the manufacturer