Merck RQflex 10 Instruction Manual page 20

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Important
Interrupting the measurement procedure (menu guidance)
When?
1 . To repeat a measurement e.g. when the strip was inserted incorrectly
or too late.
2 . For serial measurements.
How?
Once the first measurement has been completed, a further measurement
can be carried out simply by pressing the START button. In the case of
procedure D the START button has to be pressed twice in brief succession.
In all these cases the instrument makes the measurements immediately.
The result is displayed and stored automatically.
Remarks regarding serial measurements
If you wish to measure e.g. several nitrate samples, it is advisable to follow
the procedure below. For repeat serial measurement the countdown function
is not available and an additional stopwatch is needed.
1 . Run the standard measurement (Procedure A) once.
2 . Immerse separate Reflectoquant® strips into your sample at 15-second
intervals. Shake off any excess liquid and allow each strip to react outside
the instrument.
3 . After completion of the reaction time (60 seconds) insert each strip into
the instrument. Press the START button to perform the measurement
(i.e. a strip is inserted and measured every 15 seconds).
Warning
The reaction times of the strips must be monitored precisely. Differences
from the default value may cause (false-low) errors in the result due
to changes in strip colour with time.
To save batteries the instrument switches off after 2 minutes if no key is
pressed within this time period.