FLK Gas Sampling System - MPIP - Free

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SQ253 Valve Combination 1.5 Mode of operation In conjunction with an PLC programmable logic controller, the compressed air valve combination carries out the appropriate cleaning program for the flushing of the gas sampling system. Dry compressed air, free of dust and oil, is required at 6...8 bar. The consumption depends on the duration of cleaning and on the compressed air pressure. The compressed air for the cleaning is passed via the filter (Figure 2) with automatic condensate separator. For safety reasons manual shut-off ball tap are provided in the filter feed for shutting off the compressed air during maintenance work, etc. The low-pressure in the measuring gas line between the measuring gas input on the probe, the four-way ball valve and the measuring gas pump in the analysis cabinet is measured with the pressure switch. This low pressure is a measure of the contamination in the probe, dust removal filter and following measuring-gas line to the measuring gas pump. With a blockage in these areas the measuring gas pump produces a negative pressure and if this exceeds the set limit, flushing is started irrespective of the set flushing interval period. The condensate occurring in front of the valve combination is collected in an enclosed glass vessel. The motor-driven four-way ball valve releases the measuring gas path when the probe is inserted and when no faults are present in operation. If a measuring cycle is started, the four-way ball valve moves to the "Closed" position. The measuring gas line is therefore closed, so that no compressed air can enter the analysis cabinet. Now the solenoid valves for the filter flushing (Figure 2, Item 6) are controlled cyclically. The compressed air is blown into the probe through the inner side of the filter in a pulsating manner. Shortly before the termination of the filter flushing, the solenoid valves for the probe flushing (Figure 2, Item 5) are also switched. This cleans the filter pipe from the outer side and also the probe. After termination of the filter / probe flushing, the compressed air valves are closed and the four-way ball valve turns further into the position "Blow out condensate". Then the solenoid valves are controlled once again so that the condensate is blown out of the condensate vessel. Pressure compensation with respect to atmospheric pressure then takes place in the "Test" position. Note: See the operating manuals for the PLC controller, <strong>FLK</strong> probe and electrically heated filter for further details on flushing. When using the withdrawal device with a compressed air motor, the following valves are also accommodated for the emergency withdrawal of the probe. 1. Solenoid valve which opens in the unenergized state and therefore switches on the compressed air motor. 2. Pneumatically operated valve which switches off the compressed air motor via a pneumatic limit switch when the probe withdraws. For all the electrical connections to the withdrawal device (drive motor, limit switch) and to the electrically heated filter (heater and thermostat) coded connectors are provided on the bottom. These enable quick mounting and rapid replacement of defective parts. The terminal strip in the valve combination is provided for the connection of the flexible, heat resistant trunk cable to the control cabinet. Copyright ® SIEMENS Page 62 04/04
SQ253 Valve Combination 1.6 Technical data Electrical supply Voltage: 110 – 230VAC + 24VDC Compressed air supply Supply pressure 6 ... 8 bar, Dry, free of dust and oil Permissible ambient temperature: 0 ... 60°Cel. Dimensions: 630 mm x 380 mm x 210 mm Type of protection: IP 54 to DIN 40050 Weight: 25kg Pressure switch : Display range Two way contact Contact rating -300 ... -700 mbar max.: 250V AC, 1,5A / 24DC, 2A 4-way valve: 24 VDC Actuating time for 90° approx. 20sec Compressed air filter: Max operating pressure 25 bar Max. temperature 90 °C Filter element sintered metal Pore size 30 µm Draining automatic Solenoid valves: Max operating pressure 0...16 bar Max. temperature 80 °C Copyright ® SIEMENS Page 63 04/04
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FLK Gas Sampling System Operating M
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SQ250 FLK Gas Sampling System 1. In
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SQ250 FLK Gas Sampling System 1.5 M
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SQ250 FLK Gas Sampling System Fig.
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Page 76 and 77: SQ254 Heat Exchanger Note: We would
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Page 82 and 83: SQ254 Heat Exchanger 3.3 Adjustment
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