Abstract: The present invention relates to a flow measurement system for controlling a gas fireplace (1) comprising a flow passage (11) in fluid communication with the gas fireplace by use of a differential pressure pressostat (13). A first gauge connector (14) is in the flow passage and connected to a first pressure sensor in the differential pressure pressostat for measuring a total pressure in a fluid flowing in the flow passage. A second gauge connector (15) is arranged near the first gauge connector and connected to a second pressure sensor in the differential pressure pressostat for measuring a static pressure in the fluid flowing in the flow passage. Based on these measures a dynamic pressure, and there from the flow velocity, in the fluid flowing in the flow passage is determined and used to switch off the gas fireplace, when the flow becomes below a set threshold value.

Abstract: The present invention relates to a flow measurement system arranged for controlling a gas fireplace (1). It comprises a flow passage (11) in fluid communication with the gas fireplace to be controlled by use of a differential pressure pressostat (13). A first gauge connector (14) is arranged in the flow passage and connected to a first pressure sensor in the differential pressure pressostat for measuring a total pressure in a fluid flowing in the flow passage. A second gauge connector (15) is arranged near the first gauge connector and connected to a second pressure sensor in the differential pressure pressostat for measuring a static pressure in the fluid flowing in the flow passage. Based on these measures a dynamic pressure, and there from the flow velocity, in the fluid flowing in the flow passage is determined. This parameter is used to switch off the gas fireplace, when the flow becomes below a set threshold value.