System design
22 Edition 01/2016 multi EA 4000
The combustion tube for the C/S detection consists of a special high temperature ceramic
(HTC). This is particularly robust, corrosion-resistant and low in wear. Thanks to the HTC
technology samples can be digested without catalysts at temperatures of up to 1500 °C. For
particularly difficult matrices the combustion temperature can be increased to 1800 °C with
special additives (utilization of the exothermal effect).
A quartz tube is used as combustion tube for the Cl detection. This features special chemical
inertia against HCl and prevents too low results and memory effects during analysis.
The combustion system is equipped with a temperature controller monitoring the heating of
the furnace, keeping the temperature at the target value and preventing overheating.
Fig. 1 Horizontal furnace of the basic device multi EA 4000
4.2.2 Pneumatic and hose system
Hose system
The connection between the individual components and to the analysis modules is made via
a hose system. The design of the hose system in the respective module configurations can
be found in the hose diagrams in section "Recommissioning after transport or storage" p.
122 ff.
Controlling the gas flows
The gas flow for carrier gas and combustion gas is controlled via manually adjustable flow
meters at the front of the basic device.
An integrated intake pump ensures the stable flow of the measuring gas through the detec-
tor. The necessary intake flow is set with the "pump" valve at the flow meter.
The pump and the gas flows are added automatically once the multiWin program has been
started and the actual temperature of the combustion furnace differs less than 50 K from the
target temperature. If the temperature differs more than 50 K from the target temperature,
the pump and gas flows are automatically switched off.
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