Monitoring system

1. A monitoring system ( 2 ) for monitoring the number and/or concentration of particles ( 12 , 22 ) in a fluid ( 10 ), the monitoring system ( 2 ) comprising:

a micro processer ( 6 ) configured to execute programmed instructions in order to identify and classify particles ( 12 );

a storage member ( 8 );

an optical sensor member ( 40 ) comprising a 2-D optical sensor ( 4 ) and a light source ( 36 ), the optical sensor member ( 40 ) being configured to record a plurality of images of at least a part of the fluid ( 10 ) during a recording by varying the relative position of a focal plane of the optical sensor member ( 40 ) with respect to the fluid, and the monitoring system ( 2 ) being configured to generate an alarm if a predefined criterion is met;

a flow cell ( 42 ) having an inlet valve ( 44 ′), an outlet valve ( 44 ), and a sample zone ( 38 ), the inlet and outlet valves ( 44 ′, 44 ) being configured to be closed so that a fluid inlet ( 54 ) and a fluid outlet ( 56 ) of the flow cell are closed during optical exposure of the 2-D optical sensor ( 4 ); and

a control system configured to control (i) the inlet and outlet valves ( 44 ′, 44 ) to replace the fluid ( 10 ) in the flow cell ( 42 ), and (ii) a pump that is configured to replace the fluid ( 10 ) in the flow cell ( 42 ) so that new images can be recorded,

wherein the monitoring system ( 2 ) is configured to determine the number and/or concentration of particles ( 12 ) in the fluid ( 10 ) on the basis of the optical response of single particles ( 12 ) in the sample zone ( 38 ) in the fluid ( 10 ),

wherein the fluid ( 10 ) in the sample zone ( 38 ) is kept stationary relative to the optical sensor member ( 40 ) during each recording of a plurality of images,

wherein the monitoring system ( 2 ) maintains a constant volume of the fluid in the sample zone ( 38 ), and

wherein, between each recording of a plurality of images, the optical sensor member ( 40 ) is moved in an x and/or y and/or z direction.

2. The monitoring system ( 2 ) according to claim 1 , wherein the optical sensor member ( 40 ) comprises at least one lens system ( 34 ).

3. The monitoring system ( 2 ) according to claim 1 , wherein the monitoring system ( 2 ) is configured to determine the number of micro organisms in the fluid ( 10 ) on the basis of the optical response of the micro organisms.

4. The monitoring system ( 2 ) according to claim 1 , wherein the micro processes ( 6 ) is configured to determine the number and/or concentration of particles ( 12 ) and/or micro organisms and generate an alarm if:

a) the number and/or concentration of particles ( 12 ) and/or micro organisms exceeds a first preset value ( 28 ),

b) the rate of increase in the number and/or concentration of particles ( 12 ) and/or micro organisms exceeds a second preset value ( 32 ),

c) the change in morphology of the particles ( 12 ) and/or micro organisms meets a first preset criterion, and/or

d) the change in size of the particles ( 12 ) and/or micro organisms meets a second preset criterion.

5. The monitoring system ( 2 ) according to claim 4 , wherein the monitoring system ( 2 ) comprises at least a first optical sensor member ( 40 ) and a second optical sensor.

6. The monitoring system ( 2 ) according to claim 5 , wherein the monitoring system ( 2 ) is configured to calculate the difference between parameters determined on the basis of measurements based on images recorded by the at least the first optical sensor member ( 40 ) and the second optical sensor member, respectively.

7. The monitoring system ( 2 ) according to claim 6 , wherein the monitoring system ( 2 ) comprises at least two sensor units and the at least two sensor units are configured to communicate with a central control device ( 16 ).

8. The monitoring system ( 2 ) according to claim 7 , wherein the monitoring system ( 2 ) is configured to generate an alarm if at least one preset criterion based on information from the at least two sensor members is met.

9. The monitoring system ( 2 ) according to claim 2 , wherein the optical sensor member ( 40 ), the micro processer ( 6 ), the storage member ( 8 ) and the lens system ( 34 , 36 ) are built together in one sensor unit ( 16 ).

10. The monitoring system ( 2 ) according to claim 1 , wherein the optical sensor member ( 40 ) is configured to be displaced along a longitudinal axis (X) of a flow cell ( 42 ).

11. A method for analysis using a monitoring system according to claim 1 , the method comprising analyzing particles in a liquid sample.

12. A monitoring system ( 2 ) for monitoring the number and/or concentration of particles ( 12 , 22 ) in a fluid ( 10 ), the monitoring system ( 2 ) comprising:

a micro processer ( 6 ) configured to execute programmed instructions in order to identify and classify particles ( 12 );

a storage member ( 8 );

an optical sensor member ( 40 ) comprising a 2-D optical sensor ( 4 ) and a light source ( 36 ), the optical sensor member ( 40 ) being configured to record a plurality of images of at least a part of the fluid ( 10 ) during a recording by varying the relative position of a focal plane of the optical sensor member ( 40 ) with respect to the fluid, and the monitoring system ( 2 ) being configured to generate an alarm if a predefined criterion is met; and

a flow cell ( 42 ) having an axis,

wherein the monitoring system ( 2 ) is configured to determine the number and/or concentration of particles ( 12 ) in the fluid ( 10 ) on the basis of the optical response of single particles ( 12 ) in a sample zone ( 38 ) in the fluid ( 10 ),

wherein the fluid ( 10 ) in the sample zone ( 38 ) is kept stationary relative to the optical sensor member ( 40 ) during each recording of a plurality of images, and

wherein, between each recording of a plurality of images, the optical sensor member ( 40 ) is moved in an x and/or y and/or z direction.

13. A monitoring system ( 2 ) for monitoring the concentration of particles ( 12 , 22 ) in a fluid ( 10 ), the monitoring system ( 2 ) comprising:

a micro processer ( 6 ) configured to execute programmed instructions in order to identify and classify particles ( 12 );

a storage member ( 8 );

an optical sensor member ( 40 ) comprising a 2-D optical sensor ( 4 ) and a light source ( 36 ), the optical sensor member ( 40 ) being configured to record at least one image of at least a part of the fluid ( 10 ); and

a flow cell ( 42 ) having an inlet valve ( 44 ′), an outlet valve ( 44 ), and a sample zone ( 38 ), the inlet and outlet valves ( 44 ′, 44 ) being configured to be closed so that a fluid inlet ( 54 ) and a fluid outlet ( 56 ) of the flow cell are closed during optical exposure of the 2-D optical sensor ( 4 ),

wherein the monitoring system ( 2 ) is configured to determine the concentration of particles ( 12 ) in the fluid ( 10 ) on the basis of the optical response of single particles ( 12 ) in the sample zone ( 38 ) in the fluid ( 10 ),

wherein the fluid ( 10 ) in the sample zone ( 38 ) is kept stationary relative to the optical sensor member ( 40 ) during the recording of the at least one image, and

wherein the monitoring system ( 2 ) maintains a constant volume of the fluid in the sample zone ( 38 ).