A milk meter for measuring a flow rate of a milk flow, provided with an inlet to which, in use, the milk flow is supplied, an outlet where the milk flow leaves the milk meter, in use, and a liquid flow path extending from the inlet to the outlet, wherein in the liquid flow path a valve system is included which can selectively take up a first or second valve position where in the first valve position at least a first part (5.1) of the liquid path is open and a second part (5.2) of the liquid path is closed and in the second valve position at least the first part of the liquid path is closed and the second part of the liquid path is open, wherein the milk meter is furthermore provided with at least one sensor device for generating a sensor signal indicative of a flow rate of a liquid flow through the first part of the liquid path when the valve is in the first valve position, and a processing unit, wherein the processing unit is operatively connected with the at least one sensor device for receiving the sensor signal, characterized in that the processing unit is configured for carrying out the steps of: establishing of a performance of a rinsing operation on the milk meter whereby the milk meter is rinsed with a rinsing liquid different from the milk flow while the valve system is controlled to be in the second valve position so that the rinsing liquid should flow through the second part of the liquid path and not through the first part of the liquid path; and depending on the establishing of the rinsing operation and depending on the sensor signal, generating of a condition signal indicative of the establishing of a liquid flow through the first part of the liquid path during the performance of the rinsing operation. wherein in the liquid flow path a valve system is included which can selectively take up a first or second valve position where in the first valve position at least a first part (5.1) of the liquid path is open and a second part (5.2) of the liquid path is closed and in the second valve position at least the first part of the liquid path is closed and the second part of the liquid path is open, wherein the milk meter is furthermore provided with at least one sensor device for generating a sensor signal indicative of a flow rate of a liquid flow through the first part of the liquid path when the valve is in the first valve position, and a processing unit, wherein the processing unit is operatively connected with the at least one sensor device for receiving the sensor signal, characterized in that the processing unit is configured for carrying out the steps of: establishing of a performance of a rinsing operation on the milk meter whereby the milk meter is rinsed with a rinsing liquid different from the milk flow while the valve system is controlled to be in the second valve position so that the rinsing liquid should flow through the second part of the liquid path and not through the first part of the liquid path; and depending on the establishing of the rinsing operation and depending on the sensor signal, generating of a condition signal indicative of the establishing of a liquid flow through the first part of the liquid path during the performance of the rinsing operation. establishing of a performance of a rinsing operation on the milk meter whereby the milk meter is rinsed with a rinsing liquid different from the milk flow while the valve system is controlled to be in the second valve position so that the rinsing liquid should flow through the second part of the liquid path and not through the first part of the liquid path; and depending on the establishing of the rinsing operation and depending on the sensor signal, generating of a condition signal indicative of the establishing of a liquid flow through the first part of the liquid path during the performance of the rinsing operation.