Hanna Instruments HI 98186 - Manual (Page 25)

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If the DO value is less than the minimum start DO value, the meter will
display an error message, and the test cannot be started.
If the minimum start DO condition is met the instrument will display the
instantaneous specific oxygen consumption rate and the amount of time that
has passed from the beginning of the test.
In case that the SOUR value is corrected to 20 °C (68 °F) and the measured
temperature isn’t in the range 10 to 30 °C the temperature value will blink
to alert that the temperature correction isn’t valid.
If the DO reading is less than the minimun end DO value set during SOUR
configuration, a warning icon will be displayed and a beep will be heard
every two seconds. Press Stop to stop the test and the beeper.
To end the SOUR test before the maximum interval set during SOUR
configuration press Stop.
If Stop is pressed before the minimum time for the SOUR test has elapsed the
instrument will display a warning message.
Press Resume to continue the test or Stop to end the test.