| 摘要 |
In a device for determining the concentration of impurities in a current of water, a current of liquid is branched off respectively before and after the conduit block for the process via conduits (8, 9) and delivered, in each case, into a cuvette (16, 17), a light source (18) being assigned in each case to the cuvettes (16, 17), the bundles of rays (31, 32) of which source penetrate the cuvettes (16, 17) and are conducted in each case by a beam-splitter (33) to a first detector (19) as well as to a second detector (29), the electrical signals from the detectors (19, 29) being compared with each other by an electrical circuit (41 to 44, 34, 35) and being processed into a recognition signal. In order to make possible a bubble-free sample stream, magnetically actuable valves (22, 23) are connected in the return conduits (20, 21), which are connected to the cuvettes (16, 17), the signals to open and close the valves (22, 23) being generated by a frequency generator (13). <IMAGE>
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