FLK Gas Sampling System - MPIP - Free

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Siemens SQ253 Valve Combination 1.3 Field of application The valve combination is used for the automatic cleaning of FLK Gas Sampling Probes which are mainly used for measuring gas sampling up to approx. 1800 °C with a high dust content. Due to the high dust concentration in the process gas, dust deposits in the sampling probe and in the heated filter are unavoidable. Therefore, automatic, cyclical cleaning has been implemented for the probe and the filter. The mechanical parts required for this are accommodated in the valve combination. If a compressed air motor is being used for the "emergency withdrawal" of the probe, the control valves needed for the motor are also in the valve combination. Note: See also the general operating manual for the FLK Probe. 1.4 Construction The valve combination is designed as a compact unit (see Figure 2). All the parts required for flushing, the valve unit for the control of the compressed air motor (Item 4, optional), and the drive motor for the four-way ball valve (Item 10) are accommodated so that they are protected from dust, splashing water and from mechanical damage. A compressed air filter with automatic condensate drain is connected in front of the filter in the compressed air line. Maintenance-free ball tap (Items 2) are provided for shutting off the compressed air during maintenance work. The compressed air filter and the ball tap are fitted on the outside so that easy operation and cleaning are possible. The buttons for starting and stopping the flushing are located on the front panel. With this construction the valve combination should only be opened in case of a fault or for maintenance work. A condensate vessel is fitted on the side before the four-way ball valve for retaining the condensate arising after the electrically heated filter. Note: If a heated line is being used for passing the measuring gas between the probe and the analysis cabinet, the condensate vessel (Item 9), four-way ball valve (Item 10) and low-pressure pressure switch are located in the analysis cabinet so that the heated line can be cleaned when flushing. Copyright ® SIEMENS Page 60 04/04
Siemens SQ253 Valve Combination Fig. 2 Valve combination Legends: 1 Coupling for compressed air connection 2 Manual shut-off ball valve 3 Pneumatic valve for compressed air motor 4 Electrically operated valve for compressed air motor 5 Solenoid valves for probe flushing 6 Solenoid valves for filter flushing 7 Compressed air connection for probe flushing 8 Compressed air connection for filter flushing 9 Condensate precollector 10 Electrically driven four-way ball valve 11 Connection terminals for all electrical connections for the trunk cable to the controller 12 measuring gas input from probe 13 Teflon hose 14 Measuring gas output to analyzer Copyright ® SIEMENS Page 61 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.
Page 10 and 11: SQ250 FLK Gas Sampling System 2. In
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Page 14 and 15: SQ250 FLK Gas Sampling System 2.7 C
Page 16 and 17: SQ250 FLK Gas Sampling System 2.10
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Page 22 and 23: SQ250 FLK Gas Sampling System 4. Ma
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Page 26 and 27: • When the pump has switched off,
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Page 30 and 31: Copyright ® SIEMENS Page 30 04/04
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Page 72 and 73: SQ253 Valve Combination 4.6 Low-pre
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