HITECH INSTRUMENTS technical datasheet A member of the MTL Instruments Group GIR5000 series - landfill & biogas analysers Multiparameter analysers for biogas applications • CH4, CO2, H2S and O2 • ATEX Zone 2 certified • Continuous monitoring • Robust, weatherproof design • Field service friendly Applications • Landfill gas monitoring • Digester gas analysis • Flare stack monitoring • CDM verification • Fuel gas analysis • CHP engine protection and efficiency The GIR5000 series analysers are ideal for biogas applications. These gases are usually a mixture of methane (CH4) and carbon dioxide (CO2) together with oxygen (O2) and hydrogen sulphide (H2S) which have implications for efficiency and safety. Two or three gas versions are available in a variety of configurations and all are ATEX certified. Methane and carbon dioxide are both greenhouse gases (GHG). Methane is an important fuel gas for CHP engines, if not used as fuel then it is flared off to produce the less harmful carbon dioxide. Hitech use NDIR sensors to measure methane and carbon dioxide. These are sensors specially designed to withstand the damp, corrosive atmosphere often found in these applications. Oxygen is an important process indicator in both landfill and digester gas. In landfill gas, a low reading might indicate the presence of an underground landfill fire, whilst a high reading may indicate over extraction from the site. In digester gas, a high reading may indicate a decrease in microbial activity due to poisoning. For this application Hitech use a special electrochemical cell designed for use in the presence of acidic gases, e.g. carbon dioxide. Hydrogen sulphide is present in landfill and digester gas in varying amounts depending on the substrate composition. Hydrogen sulphide can be extremely corrosive to generator sets and continuous measurement can prevent costly damage. Hitech have developed a unique system which allows for continuous measurement of H2S. At 2000ppm H2S, good sensor lifetime can still be achieved. Sample conditioning is important in the variable conditions encountered in this application. Hitech provide internal filters, an 500-0017 Rev3 031010 www.hitech-inst.co.uk [email protected] internal pump and low-flow alarm as standard. An external coalescing filter is highly recommended and cooling options can also be offered to remove water. The enclosure itself contains a small heater to ensure that water vapour does not condense in the analyser. Hitech are ready to recommend complete systems on receipt of full gas stream specifications. Attention to application specific detail is a feature of the GIR5000 from the robust, weatherproof case down to the correct internal filter elements. The instrument has a modular design so that if one sensor is requiring maintenance, the others will still work well. All sensor modules are replaceable in the field for minimum downtime. These are hazardous area applications by their very nature. All GIR5000 versions are ATEX certified for use in Zone 2 hazardous areas according to the industry Code of Practice ESA ICOP 2nd Edition, a decision endorsed by the Health & Safety Executive in the UK.

Carbon Dioxide: Hydrogen Sulphide Consult Hitech for other gases and ranges, or installations at high altitude. Sample flow Sample temperature range Sample pressure Sample connections Inlet and outlet: bulkhead compression Analogue Outputs Maximum output load Oxygen/hydrogen sulphide: 200 ohms Methane/carbon dioxide: 400 ohms Alarm Outputs 2 x High alarm for each gas 1 x Fault alarm for low sample flow rate 1 x Fault alarm for IR sensors (Volt free contacts for all alarms) Ambient operating temperature range Enclosure details Wall mount, ventilated, GRP enclosure Protection: IP54 (with door closed)...