Standard Operations

 

Table 5 Barcode program options (continued)

Options

Description

 

 

Save as User Program

To store the selected parameters as a User Program, see section 6.1 on page 61.

 

 

Recall Data

Call up saved measurement data or time courses, see section 5.3 on page 37.

 

 

Instrument Setup

Basic data of the instrument, see section 5.2 on page 27.

 

 

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 (TNT919) 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.".

Some barcode tests do not require a sample blank value to be determined, as turbidity and color are dealt with during the test procedure. Other barcode tests use the reagent test vials to determine the sample blank. Please refer to the Hach procedure for method-specific instructions.

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Hach DR 2800 user manual Sample blank, Options Description Save as User Program