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6.10 Liquid Detection Board
6.10.1 Introduction
The liquid detection board detects whether there is liquid in the tubes by monitoring the index of refraction.
Figure 6-16 Liquid detection board
6.10.2 Components
The most important components of the board are the photocouplers. You can use a piece of paper to
block the photocoupler and check whether the board is working properly.
6.10.3 Liquid detection board problem
When there is reagent, the TP1 on the board should output voltage (about 4.0 V); when there is no
reagent, TP4 should output voltage (lower than 2.0 V). When there is an problem, check whether the
test point are in accordance with reagent status.
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