Hach DR2400, Manual

Page: 18 / 66

Getting Started
Getting Started
Page 18
5940018Getting Started.fm
Figure 8 Main Menu–Standard Software
1.8 Using the DR/Check™ Absorbance Standards
Hach’s DR/Check Absorbance standards are used in instrument performance
verification on both the DR/2400 and DR/800 Series instruments. The set
consists of three standards plus a blank. Each of the standards is certified to give
a known absorbance value at a particular wavelength. The standards can be
used to verify that the instrument is performing in a consistent manner on a
routine basis.
1.8.1 How to Use the Standards
Note: Be sure to follow the cell alignment steps found on the product box.
The DR/Check Standards are used to verify instrument performance by
measuring a specific absorbance at each of the following wavelengths:
•
420
•
520
•
560
•
610
1. From the Main Menu screen, touch
Single Wavelength.
2. From the Single Wavelength screen, touch
λ.
3. Key in 420 nm.
4. Insert the blank into the instrument so that it is properly aligned with the light
source. Touch
Zero
.
Note: For best results, wipe all the cells with a clean tissue and silicone oil before use
5. Place Standard #1 in the instrument so that it is properly aligned. Read the
absorbance.
6. Record the initial instrument reading in the blank table provided with the
standards. The initial value should be within the tolerance limits of the
certified absorbance specified on the Certificate of Analysis for the DR/Check
Standards.
Note: If values are not within specified tolerance limits, contact Hach Technical Support. See
Repair Service on page 63 for contact information.
7. Repeat steps 2 through 6 for the other two standards, using the correct
wavelength in step 3 .
Note: To continuously monitor instrument performance, repeat all steps and compare readings to
the recorded values.