© Siemens AG 2015 Analytical Application Sets Analysis of biogas Set BGA ■ Overview ■ Application The efficiency of biogenic production processes and optimum operation of the plant largely depends on continuous monitoring of the biogas composition. The basic version of the Set BGA analyzes CH4 and CO2 using the proven ULTRAMAT 23 IR analyzer. The concentrations of O2 and H2S are optionally measured using electrochemical sensors and also converted into output signals of 4 to 20 mA. In this manner, the Set BGA contributes to operational safety and explosion protection in addition to process optimization. The modular design of the system takes into account the physical conditions of the gas with regard to temperature and moisture in that various gas preparation components for heating or drying the sample gas can be configured as required. The Set BGA (biogas analyzer) is a standardized system for stationary, continuous operation for the analysis of landfill gas, sewage gas or biogas. ■ Benefits 4 Standardized complete system The standardized complete system has a modular configuration and can thus be used at various measuring locations for different measuring tasks. • Simple and fast to configure • Field-tested and matched Set in rugged industrial design • Extremely high long-term stability • The Set BGA is based on the proven ULTRAMAT 23 Field-proven, reliable technologies • Autocalibration function with ambient air reduces the maintenance requirements • Detonation protection in accordance with EN 12874 • Modular system design based on long-term tested components • LEL sensor for cabinet monitoring (optional) Simple operation • Intuitive menu guidance • Configuration on large displays with plain text • Two freely-configurable limits per measured component 4/38 Siemens AP 01 · 2015 The gas mixture can be explosive at critical concentration ratios between methane and oxygen. Even if such critical gas compositions occur extremely rarely, the danger of ignition must nevertheless be avoided. For this reason, the Set BGA is designed with a high safety standard and even the basic version is equipped with flow monitoring and detonation protection in accordance with EN 12874 in the sample gas path. To increase safety even further, a gas sensor for monitoring the ambient air can be connected as an option. It is also possible to monitoring up to four measuring points using an optional sample switching cabinet. In this case the sample flows are sucked in continuously using a powerful pump in order to achieve fast measuring times. © Siemens AG 2015 Analytical Application Sets Analysis of biogas Set BGA ■ Design ■ Technical specifications The Set BGA consists of the following components: • ULTRAMAT 23 analyzer with four measured components max. • Analyzer cabinet with modularly configurable gas preparation components • Cabinet for measuring point switchover (option) • Heated line (option) The ULTRAMAT 23 is selectable with two IR components (CO2 and CH4). Furthermore, the configuration can be equipped with an electrochemical oxygen sensor and/or an electrochemical hydrogen sulfide sensor. The corresponding measuring ranges are listed in the table below. Technical data of Set BGA Installation Ambient temperature 5 … 38 °C, with cabinet heating ± 0 °C Site Indoor/outdoor installation (configurable) Gas inlet conditions Sample gas pressure • With pump, depressurized suction mode, selectable with internal or external pump • Provision must be made for a pressure reduction for pressures greater than 1 200 mbar absolute Pump performance Adjustable to 60 … 80 Nl/h Sample gas temperature Max. 45 °C, with moisture saturation Measured component Smallest measuring range Largest measuring range CO2 0 … 20 % 0 … 100 % Supply 1 200 … 240 V AC, 47 … 63 Hz CH4 0 … 20 % 0 … 100 % Supply 2 100 … 120 V AC, 47 … 63 Hz O2 0…5% 0 … 25 % Power consumption Approx. 180 VA (without cooler and sample preparation) H2S (high) H2S (low) 0 … 5 000 ppm 0 … 5 ppm 0 … 50 ppm The ULTRAMAT 23 calibrates the IR components and the electromechanical oxygen sensor automatically with ambient air. Calibration with calibration gas is recommended once a year or after oxygen sensor replacement. In order to comply with the technical specification data, the hydrogen sulfide sensor must be calibrated every three months. An appropriate calibration gas is therefore required. It is supplied to the analyzer through a manually switchable ball valve. Power supply Connection systems Teflon hose With PVDF screwed glands Connection systems Metric (6 mm) or imperial (1/4") selectable Dimensions Set BGA measuring system (W x H x D) 600 x 781 x 600 mm Sample preparation (W x H x D) 600 x 600 x 220 mm 4 Weight Set BGA measuring system Approx. 50 kg Sample preparation Approx. 22 kg System design System housing 3-part sheet-steel housing with window Degree of protection IP54 Cabinet conditioning Fan Cooling system Peltier cyclone cooler (optional) Sample preparation Max. six sample streams can be controlled using Logo module with fast loop pump in separate housing Analog outputs Per component 0/2/4 … 20 mA; NAMUR, floating, max. load 750 Ω Measured components / measuring ranges Set BGA measuring system CH4 0 … 100 vol% to 0 … 20 vol% (NDIR) CO2 0 … 100 vol% to 0 … 20 vol% (NDIR) O2 0 … 25 vol% to 0 … 5 vol% (electrochemical or paramagnetic optionally selectable) H2S 0 … 5 000 ppm (electrochemical); optional 0 … 5 ppm to 0 … 50 ppm (electrochemical); optional Safety assemblies Assembly 1 Detonation protection F501 Assembly 2 Flow measurement with limit monitoring at the output Assembly 3 LEL monitoring (optional) Comment • The system concept of the Set BGA is based on the preconfigured ULTRAMAT 23 solutions (7MB2335-…, 7MB2337-…) • The technical performance data concerning the measuring response correspond to the catalog data of the ULTRAMAT 23. The preconfigured version does not contain any ULTRAMAT 23 add-ons or retrofitting sets. 2-stream sample preparation Siemens AP 01 · 2015 4/39 © Siemens AG 2015 Analytical Application Sets Analysis of biogas Set BGA ■ Selection and ordering data Set BGA basic configuration, including flame arrestor Article No. 7MB1955- 7 7 7 7 7 - 7 7 7 7 Cannot be combined Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Gas connections, external 6 mm 0 ¼ inch 1 Sample conditioning Without gas cooling A Passive cooling (supplied separately) B Peltier cooler, integrated in Set BGA enclosure C Enclosure design Not heated A Electrically heated B Pump design Without pump 0 Internal pump in analyzer 1 External pump, fitted in Set BGA enclosure 2 Power supply 4 AC 120 V, 60 Hz 0 AC 230 V, 50 Hz 1 AC 110 V, 50 Hz 2 AC 220 V, 60 Hz 3 Infrared measured components Version with one measured component Highly selective ULTRAMAT 23 single-beam infrared gas analyzer for measuring methane; mounted in 19-inch rack unit for installation in wall cabinet Specification: • ·Measured component CH4 - Smallest measuring range: 0 ... 20 % - Largest measuring range: 0 … 100 % 0 Version for two measured components Highly selective ULTRAMAT 23 single-beam infrared gas analyzer for measuring carbon dioxide and methane; mounted in 19-inch rack unit for installation in wall cabinet Specification: • 1. Measured component CO2 - Smallest measuring range: 0 ... 20 % - Largest measuring range: 0 … 100 % • 2. Measured component CH4 - Smallest measuring range: 0 ... 20 % - Largest measuring range: 0 … 100 % 1 Version with one measured component Highly selective ULTRAMAT 23 single-beam infrared gas analyzer for measuring carbon dioxide; mounted in 19-inch rack unit for installation in wall cabinet. Specification: • Measured component CO2 - Smallest measuring range: 0 ... 0.5 % - Largest measuring range: 0 … 2.5 % 2 Oxygen measurement Gas analyzer without oxygen sensor A Electrochemical oxygen sensor; sensitive to CO2 Specification: • Smallest measuring range: 0 ... 5 % • Largest measuring range: 0 ... 25 % • Repeatability: approx. 0.05 % O2 B Paramagnetic oxygen measuring cell; no sensor wear Specification: • Smallest measuring range: 0 ... 2 % • Largest measuring range: 0 ... 100 % • Repeatability: < 1 % of smallest measuring range C 4/40 Siemens AP 01 · 2015 C © Siemens AG 2015 Analytical Application Sets Analysis of biogas Set BGA Set BGA basic configuration, including flame arrestor 7MB1955- 7 7 7 7 7 - 7 7 7 7 Cannot be combined H2S measurement Without H2S sensor A With H2S sensor, 0 … 5 000 ppm B B With H2S sensor, 0 … 5 ppm to 0 … 50 ppm D D Documentation German, 1 set (paper and CD) 0 English, 1 set (paper and CD) 1 French, 1 set (paper and CD) 2 Further versions (add-ons) Add "-Z" to Article No. and specify Order code Heated sample gas line, self-regulating, Ex-proof Length: 5 m, supplied separately A01 Length: 10 m, supplied separately A02 Length: 15 m, supplied separately A03 Length: 20 m, supplied separately A04 Length: 25 m, supplied separately A05 Length: 30 m, supplied separately A06 Length: 35 m, supplied separately A07 Communication PROFIBUS PA interface A12 PROFIBUS DP interface A13 4 Fast loop design and sample switching 2-stream sample switching with Logo and external pump B02 3-stream sample switching with Logo and external pump B03 4-stream sample switching with Logo and external pump B04 5-stream sample switching with Logo and external pump B05 6-stream sample switching with Logo and external pump B06 Gas sensor for leak monitoring of the Set BGA system Alarm monitoring: 20 % LEL methane C01 Siemens AP 01 · 2015 4/41