Metrohm 874 USB Oven Sample Processor - Manual (Page 9)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 1 Introduction
874 Oven Sample Processor ￭￭￭￭￭￭￭￭ 1
1 Introduction
1.1 Instrument description
The 874 Oven Sample Processor is used whenever the heating up of a
sample and/or the thermal expulsion of moisture in solid substances or liq-
uids is required. In combination with a coulometric or volumetric KF titra-
tor, the 874 Oven Sample Processor is the ideal analysis system for water
determination in samples that contain disruptive components or from
which moisture can be removed only with difficulty.
One of its decisive advantages is the reduction of sample preparation to a
minimum. Thanks to the use of hermetically sealed sample vessels ("head-
space vials"), the filling of the samples can be accomplished directly on-
site. The PTFE-coated septa guarantee a constant, non-falsified water con-
tent, even after prolonged holding times.
The sample heated in the oven module releases its moisture in the form of
water vapor, which is conveyed into a measuring cell with the aid of a gas
flow. An air pump is installed for the purpose of generating the gas flow.
An inlet valve is available for nitrogen or other inert gases. The determina-
tion of the moisture can be accomplished in the measuring cell either cou-
lometrically or volumetrically according to Karl Fischer.
The operation and control of the 874 Oven Sample Processor is accom-
plished by means of the tiamo
™ PC software. This enables convenient
programming of method runs, ranging from the simple to the complex.
The integration of the 874 Oven Sample Processor together with other
instruments (e. g. with a coulometer) using one user interface, makes not
only simple operation possible, but also the evaluation and storage of the
measurement data from all of the linked instruments in one single data-
base.
1.1.1 Instrument versions
The 874 Oven Sample Processor is available in two versions with different
accessories.
￭ Version 2.874.0010 with accessories for the usage of standard vials
(volume 6 mL)
￭ Version 2.874.0020 without accessories for the usage of standard
vials. Appropriate accessories can be ordered for specific vessel sizes.