Question

Which cams are used in the earlier modules of auto-analyzers to initiate and control sample aspiration and wash cycles?

(a) Electrical cams

(b) Digital cams

(c) Analog cams

(d) Mechanical cams

I have been asked this question in a national level competition.

Enquiry is from Medical Diagnosis with Chemical Tests in chapter Clinical Laboratory Instruments of Biomedical Instrumentation

Answer 1

Right choice is (d) Mechanical cams

The best I can explain: Mechanical cams were used in the earlier modules of auto-analyzers to initiate and control sample aspiration and wash cycles. Modern systems use electronic timers to do the same function. These timers provide greater flexibility in the control of the sample-to-wash ratios, which in turn allows flexibility in setting up parameters for analyses.