Setup And Function; Functional Description - Cgs Instruments Sam-1000_Dp Bedienungsanleitung

5 Setup and function

5.1 Functional description

The cabinet sample module series SAM-1000_DP is used to connect different sample points to analysers.
Because of its modular design, it can be used for various applications in the chemical and petrochemical
industries for gaseous high-purity gases.
Special features:
The SAM-1000_DP especially distinguishes itself through the following features:
• Compact design
• Low dead volume
• Modular design
• High tightness
• Digitisation of the complete product measurement
• Control of external analysers (not Profibus-capable; binary RS232, RS485)
The SAM-1000_DP can be equipped with up to 8 sample streams (S1-S8) to a maximum of 7 analysers
(A1-A7). By default, the inputs and outputs of the measurement gas are fitted with Swagelok fittings on
the back side.
One sample gas valve and one bypass valve are actuated for every sample point. The sample gas valve
route the gas to the analysis system. In automatic mode (DCS operation), ensure that one sample gas
valve is always activated to continuously supply the analysis system with gas. The functionality of the
bypass valve is to purge the sample stream before each measuring procedure of the activated stream.
The mechanical flowmeter displays the current flow of each sample stream and will be adjusted by an
integrated needle valve. The duration and amount of the sample purge procdure is pre-calculated based
on line length, cross section and product type.
Each sample point is equipped with a mechanical flowmeter to continuously purge the sample stream.
The quantity can be regulated by a needle valve.
The sample gas pressure is adjusted mechanically by the back pressure regulator. The adjusting screw is
accessible via the hole in the front plate. The pressure can be adjusted by an Allen Key (size 4). The actual
value is determined by a pressure transducer and can be read on the display. The pressure transmitter is
configured for a threshold value depending on the application. This threshold value activates the pres-
sure alarm in the system. The flow at the back pressure regulator's outlet is displayed on the front side
by a mechanical flowmeter without a needle valve.
The sample module SAM-1000_DP is a Profibus slave. The valves can be controlled in "local" operation by
the SAM-1000_DP or DCS touch screen or in DCS operation via the DP master.
Filter frits protect gas routed components and analysers. These filter contaminants from the sample gas and
thus prevent contamination and damage to the gas routed components and analysers.
Using the compact solenoid valve block minimises dead volume, with or without capillary purge line,
and achieves fast response times of the analytical system. This system is the best solution in gas trace
analysis, for example. Check valves on the continuous bypass avoid influences of ambient air in the ex-
haust gas line during the vacuum mode. Comply with the prescribed differential pressure according to
the manufacturer's instructions!
Product:
SAM-1000_DP Revision 1.2 – Issue July 2016
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