5 sample blank, Standard operations 5.5.5 sample blank – Hach-Lange DR 5000 User Manual User Manual

Page 55

Standard Operations

5.5.5 Sample blank

Turbidity and color in the sample matrix can falsify the results of a
photometric analysis. The interference factors come from the
sample or are created by reactions with the reagents.

The influence of turbidity and/or color can be eliminated or reduced
by taking a sample blank reading.

In the barcode mode, a special cuvette/vial (LCW 919) containing
the sample blank is placed in cell compartment #1 after the sample
reading has been taken and is automatically measured. The
sample reading is then corrected by adding or subtracting the blank
value. The final result is displayed, with the message "After blank
value corr.".

Abs % Trans

To switch to % transmittance or absorbance readings

Send Data icon /
Send Data

To send data to a printer, computer or USB memory stick (Type A)

Timer icon

This functions as a stopwatch. It helps to ensure that the steps of an analysis are correctly timed
(e.g. reaction times, wait times, etc., can be exactly specified). When the specified time has
elapsed, an acoustic signal is emitted. The use of the timer has no influence on the measurement
program.

Dilution Factor Off/On

A corrective dilution factor can be entered in order to take account of certain properties.
The number entered at the dilution factor prompt will be multiplied by the result to compensate for
the adjustment. For example, if the sample has been diluted by a factor of 2, enter 2. The default
setting of the dilution factor is turned off.
Note: When a dilution is in effect, the dilution icon will appear on the display.
Note: If undiluted samples are used, set the dilution factor off.

Chemical Form

Some of the stored tests/methods allow to select the chemical form and the measuring range.

Edit

To modify an existing program

Save as User Program

To store the selected parameters as a User Program, see

section 6.1 on page 65

Recall Data

Call up saved measurement data, wavelength scans or time courses, see

section 5.3 on

page 35

Instrument Setup