Hach DR2400 - Page 292

Formaldehyde
Formaldehyde
Page 2 of 6
Formaldehyde_PP_Other_MBT_Eng_Ody.fm
5. Immediately touch
the timer icon.
A 17-minute reaction
period will begin. Proceed
with step 6 immediately
after the timer starts.
Complete steps 6–11
during the reaction
period, at the times
specified.
6. Immediately after the
reaction period starts,
shake the cylinder (the
blank) vigorously for
20 seconds. Do not wait
for the timer to beep.
7. Add the contents of
one MBTH Powder
Pillow to the prepared
sample when the timer
displays
15:00.
8. Stopper the cylinder
and shake vigorously for
20 seconds.
9. Add 2.5 mL of
Developing Solution for
Low Range
Formaldehyde to the
blank when the timer
shows
12:00. Stopper and
invert to mix.
10. Add 2.5 mL of
Developing Solution
for Low Range
Formaldehyde to the
prepared sample when
the timer shows
10:00.
Stopper and invert to
mix.
11. Just before the timer
shows
2:00, pour the
blank into the sample
cell. Pour the solution
slowly to avoid bubble
formation on the cell
walls. If bubbles form,
swirl to dislodge them.
12. Immediately wipe the
blank and place it into the
cell holder.
10 mL
10 mL