How do I start the 15 minute countdown on the Alcomonitor CC that the DOT protocol requires after a positive screening test?

When an operator starts a Screening test on the Alcomonitor CC the instrument will automatically start a 15 minute countdown if the screening test result is 0.020 or greater.  There is no way for the operator to manually put the instrument into the 15 minute countdown mode.

Note that a Screening test results less than 0.020 – for example, 0.019, 0.010, and 0.009 – will not trigger the 15 minute countdown because the DOT protocol classifies these as negative results.