M&C TechGroup CSS Series Operator's manual - Manual (Page 17)

17
Gas sampling and gas conditioning technology 4-1.1-ME
The peristaltic pump (8) draws and removes the condensate via the condensation outlet (H) on back
panel.
The liquid alarm sensor (9) which located after the gas cooler protects the gas analysers in the event
of faulty gas drying. In the event of an alarm in the condensate removal, cooling or heating functions,
the 3-way solenoid valve is automatically closed. Also the measuring pump is switched off so that no
wet gases can reach the gas outlets (D) and (E). The alarm is shown on the operation and control
board of the CSS and is available on Sub-D-Plug X2 (A) as a status contact outlet (see 10.2.2 and
10.2.3).
After the sample gas pump (10) is a gas filter (11) for precipitation of the finest particles.
After the filter, the sample gas flows through both flow meters: the flow meters FM1 (12) and FM2 (13),
and the measuring outlets (D) and (E). Both flow meters are individually adjustable by a needle valve.
In order to keep the gas outlet dew point of 5°C, the total flow rate should not exceed the specified
maximum value (see 7.).
The minimum flow rate is determined by the sample gas pump (see 17.1). If the flow rate remains un-
der the minimum value the pump membrane can be premature destroyed by over pressure.
The flow rate is controlled via needle valve on the flow meter FM1 and the optical bi stable flow sen-
sor. The flow sensor can be moved on the flow meter glass and adjusted to an alarm value of your
choice. The flow is below the alarm value, this effects a flow alarm which is shown on the operation
and control board of the CSS and which is also available on Sub-D-Plug X2 (A) as a status contact
(see 10.2).
In the test mode, the 3-way solenoid valve (4) is switched to allow zero or span gas to enter the sys-
tem. The inlets (F) and (G) are then available and the 2-way valves (5) or (6) open respectively.
Additional 3 span gas valves (K, L, N) are possible as option (see page 8). The span gas valves are
preselected by snap switch 1.5 (Fig. 1).
The versions CSS.../C are configured in such a way that the test gases first flow via the sample gas
probe and then via the sample gas inlet (C) to the gas cooler. Therefore, the CSS.../C is equipped with
the additional inlet fittings (I) and (J). The test gas outlet (I) is connected with the test gas inlet of the
sample gas probe.
In Version CSS-2 the gas cooler ECP2000 with two heat exchangers is mounted. Thus it is possible to
operate with a second independent sample gas flow. The sample gas line for the second independent
sample gas flow has to be connected to the inlet (M) and outlet (K) by customer. Condensate removal
happens via the condensate outlet (L). Sample gas pump, condensate pump, gas filter and alarm sen-
sors have to be installed extern by customer.
In case of alarm, the 3-way solenoid valve opens automatically the gas way (4) - (J) and closes the
way (4) - (C). This guarantees that no sample gas or test gas can enter the system.
Zero and span gas both flow through the heat exchanger of the gas cooler. This configuration guaran-
tees the same conditions during measuring and calibration.
The CSS gets its respective voltage via an electrical junction box X1 (B). Here, you can also find the
connections for the option "heated sample line with temperature controller" (specification see 10.1).