Figure 3
The sensor box used for the photometric assessment was a double case box with the actual photometric chamber (white asterisk) placed inside the outer box to exclude influences from ambient light. Injectors were connected via the Luer-lock fitting at the in-flow socket (IN-LF). Inside the photometric chamber a light dependent resistor (LDR) and a power light emitting diode (LED) were placed vis-à-vis around the transparent probe line with apertures fitted to the cell to additionally exclude interference with scatter light. Fluid that passed through the sensor box was drained (OUT) immediately to a reservoir (not shown). The analog/digital converter (A/D) transmitting all data to the PC workstation was placed outside, on top of the outer box.
