Installation and operating manual
EN
10
METPOINT
®
SF13
2.3.2. Product description
The METPOINT
®
FLM thermal flow meter measures the volume flow, which forms the basis for intelligent energy management.
It can be used to identify potential savings, overloads and weak points in a system to improve its efficiency. By measuring the
actual flow to the various production units, operators are in a position to make decisions based on facts. The METPOINT
®
FLM
also indicates whether there are any leaks in their system. The METPOINT
®
FLM thus provides all the information operators need
to correctly dimension and configure their system and system components for improved efficiency. The device is equipped with a
Modbus RTU(RS485) interface, a 4 ... 20 mA current output, a galvanically isolated pulse output and an optional MBus interface.
2.3.3. Operating principle
Two temperature sensors are installed in series in the direction of flow. The first temperature sensor measures the current process
temperature, while the second sensor is electrically heated to a temperature that is exactly 40 K above the temperature measured
by the first sensor. As the volume flow increases, the sensors would normally cool, but the electric heater of the second sensor
prevents such a temperature drop.
The electric energy required to maintain the temperature difference is directly proportional to the volume flow. This energy
consumption of the heater is converted into the relevant flow measurements. Taking into account the inside diameter of the pipe,
the METPOINT
®
FLM determines the exact mass flow.
