Buchi DuMaster D-480 User Manual download pdf (Page 31)

Operation Manual D-480 ©BÜCH Labortechnik AG

3 - Product description 31

Analytical characteristics

The following table explains the analytical characteristics:

Analytical characteristic

Comments

Analysis method Nitrogen determination from a sample according to Dumas.

Combustion of the samples, transfer to N

, separation of foreign

gases, thermal conductivity detection.

Standards Analysis method according to:

AOAC 99.03, AOAC 993.13, AOAC 968.06, AOAC 992.15,

AOAC 992.23, ASBC, AACC (for fertilizer, meat, meat products,

grain, oilseed, brewery grain, flour, animal feed),

DIN 10 467, milk and milk products,

EN 61010, DIN projected.

Detector Thermal conductivity detector (TCD).

Sample weight/sample volume Up to 1 g organic substance or approx. 1 ml sample volume

(depending on substance).

Dynamic work range 0.1 mg bis 200 mg N abs.

Precision Less than 0.5 % relative standard deviation with test substance

aspartic acid (sample weight: approx. 300 mg).

Detection limit 0.10 mg N abs.

Recovery rate Larger than 99.5 % for test substances.

Duration of analysis Self-optimizing, 4 to 6 minutes, depending on substance and

sample weight (e.g 5,5 min. for 0.4 g hay).

Calibration Linear and non-linear curve adjustment; total work range, if

applicable divided into two segments.

Data storage and data output Storage on hard disk or external storage media.

LIMS transfer possible.

Data output to screen and printer.

Technical specifications

Standardization

The instrument conforms to CE standards in accordance with EC Directives:

 EMC 89/336/EEC

 LVD 73/23/EEC

Control and data processing

The following table contains the technical specifications of the control and data processing system:

Reference value

Technical specifications

Control and evaluation unit PC with operating system Windows XP Professional or a newer

version of Windows Professional

Printer (optional)

Software German or English

Menu-driven

Status display during analysis

Real-time graphics

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Buchi DuMaster D-480 User Manual Page 31

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