Hach DR/700 - Page 583

61-27
Method 8110
FORMALDEHYDE (0 to 500 µg/L)
For water
MBTH Method*
1. Install module
61.01
in a DR/700.
Note: Samples must be
analyzed immediately
and cannot be stored for
later analysis.
2. Press: I/O
The display will show
610 nm
and module number
61.01
3. After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
61.04.1
*Adapted from Matthews. T.G.; Howell, T.C., Journal of the Air Pollution Control
Association, 1981, 31 (11), 1181-1184