Hach DR2400, Manual

Page: 34 / 66

Hach Programs—Simplified Analysis
Hach Programs—Simplified Analysis
Page 34
5940018HachPrograms.fm
3.5 Hach Program Options
3.5.1 Running a Reagent Blank
Use an actual reading to set the reagent blank, or enter a value manually.
3.5.1.1 Using an Actual Reading
3.5.1.2 Entering a Value Manually
1. Touch
Options
, then
Reagent Blank
.
2. If Reagent Blank is set to off, turn it on.
3. Touch the button on the left that contains the last concentration read.
4. Enter a reagent blank value and touch
OK
.
5. Touch
Adjust
to enable the reagent blank. The
Reagent Blank
icon will appear.
Note: When the reagent blank option is in use, the Reagent Blank icon will appear on the
reading screen.
Note: The adjustment must be within the limits specified for the program.
In some Hach Programs, the Reagent Blank option allows a reading
or entry of a specific value that should be subtracted from
subsequent measurements. Using a reagent blank shifts the entire
calibration curve along the y-axis, without altering the shape or
slope of the curve. The effect is equivalent to adding a y-intercept
value to the calibration line. In other words:
Concentration = Concentration Factor x Abs – Reagent Blank
1. Follow the entire Hach procedure (as described in the DR/2400
Procedures Manual ) substituting deionized water in place of
the sample.
2. After reading the concentration, touch
Options
, then
Reagent Blank
.
3. If Reagent Blank is set to off, turn it on.
4. The concentration will appear in the box on the left of the screen.
5. Touch
Adjust
to enable the reagent blank.