EC91 Intrinsically Safe Oxygen Analyser Intrinsically Safe ATEX, unsurpassed certified oxygen analyser for all hazardous areas Optional Remote Cell Applications Monitoring inert blanketing gas in oil and petrochemical applications Inert gases and Hydrogen Gas purity Glove boxes Oxygen deficiency monitoring Metallurgy Gas line monitoring Features & Benefits Unsurpassed safety protection Maintenance-free 5 year life sampling cell Air calibration facility Certified for Zone 0 This instrument has a 36 month warranty which covers any faulty workmanship and normal component failure relating to electronic circuit cards Approved by BASEEFA and CENELEC to ATEX II 1G EEX ia IIC T4 standards Intrinsically Safe Oxygen Analysis Principle of Operation Systech Illinois have over 25 years of expertise in manufacturing gas analysers for the The self-powered sensor has no moving The sensor consists of an anode, process industry and have an installed base of over a thousand instruments during this time. parts and is integral to the sample chamber. electrolyte, and air cathode, together with a The EC91 Process Oxygen Transmitter will detect levels of oxygen as low as 1ppm, up to This solves the problem of output changes diffusion limiting capillary. The rate of higher percent levels and can be used on most industrial gases and atmospheres. There is due to a flow rate change, making the diffusion is dependent upon the volume no need for routine maintenance of the fuel cell and the instrument can be easily calibrated, instrument extremely sensitive and quick to concentration of oxygen in the atmosphere using ambient air or standard calibration samples. respond to changes in oxygen or gas stream. At the cathode, oxygen is concentration. reduced to hydroxyl ions, which in turn The enclosure is manufactured from Standard and custom designed sample oxidises the metal anode. The following moulded glass fibre reinforced polyester, a systems are available on request. Sample overall reaction takes place: material with high impact resistance. It will gas may be piped directly to the instrument not be harmed by oils, common acids and or remote cell assembly (also certified alkalis, making it suitable for harsh intrinsically safe). Sample pumps and 2Pb + O2 + 2H2O → 2Pb(OH)2 environments. It is protected to IP66/Nema aspirators are also available. 4X. The EC91 transmits a 4-20mA signal which corresponds to the range of the All the electronic circuits are intrinsically The sensor has a guaranteed operational analyser. Up to six ranges can be specified. safe and have been certified to ATEX. The life of six months. When monitoring low A safe area digital indicator and alarm is EC91 is approved for EEx ia IIC T4. Optional EC91 Remote Mounted Sensor oxygen concentrations, or if the instrument available as an option. (All Stainless Steel) is not in use, the expected lifetime is considerably longer. The sensor module is inexpensive and easy to replace. Installation Safety Protection HAZARDOUS AREA SAFE AREA Gas analysis instrumentation for use in Note: Use shunt diode safety hazardous areas is commonly flame proof, barriers or isolating barrier. explosion proof or intrinsically safe. Flame proof or explosion proof instrumentation is designed to contain any event, in order to protect the close environment. This instrumentation is Systech EC91 expensive and work permits are required in order to maintain the equipment and in some 3 1 24VDC 4 2 0V cases to calibrate it. By contrast, intrinsically safe equipment is 2 wire absolutely safe, by design. There is no risk Display 3 1 4-20mA (Exi) of an event, since there is not enough 4 optional 2 Measuring circuit energy stored or available in the circuits to cause an event. Work permits are not required. Oxygen analysers in hazardous area applications demand the best protection. The sample pressure should be above 0.1 Standard or specially designed sample Intrinsically safe instruments certified to ‘ib’ Optional EC91 Barrier and Bar. If not, a pump or aspirator should systems can also be supplied by Systech cannot be installed in Zone 0 areas, as the Power Supply Box be fitted. Connection through the Illinois. Electrical installation must be made measurement gas must enter the analyser. analyser is via a 1/8” tube fitting and a via appropriate safety barriers mounted in ATEX certified ‘ia’ analysers, such as the flow regulator should be used on the the safe area. A control room indicator and EC91 can only be used in Zone 0 areas to inlet. If required, dust filters or coalescing alarms can also be specified as an option. provide adequate safety protection. filters are available. Technical Specifications Ranges 6 selectable 0-20, 0-200, 0-2000 (ppm) 0-2%, 0-20%, 0-30% Other ranges available on request Resolution 0.05% of scale Accuracy >10ppm ±2% of reading at 20°C ±5% of reading over temperature range <10ppm ±2% of reading + 0.4ppm at 20°C ±5% of reading + 0.4ppm + 0.15ppm/°C over temperature range Response Time 90% of reading within 20 seconds Calibration Range Ambient (20.9%) or certified gas Measuring Cell Type Electrochemical fuel cell Operating Conditions Sample inlet pressure 0.1 to 1 Barg, up to 17 Barg with optional sample system Sample flow rate 30ml/min to 5 ltr/min Sample temperature 0 to 40°C Ambient temperature 0 to 40°C, RH 0-99% non condensing Sample connections 1/8" OD compression fitting Unsuitable gases Corrosives, acid gases and solvents Power Requirements Power supply 24Vdc via approved barrier mounted in the safe area Power consumption 10W Display Type Digital LCD Analogue outputs Current: 4-20mA Maximum loop resistance 400 Ohms Cabinetry and Mounting Enclosure Reinforced polyester Installation Wall mounted Dimensions 200W x 200H x 175D (mm) Weight 3kg Ingress protection IP66, Nema 4X Approvals ATEX II 1G EEX ia IIC T4 Options Remote probe holder, Control room display, Aspirators, Sample systems, Alarm outputs. Local display Analogue in place of standard digital display Sample pump For pressure below 0.1 Barg Remote probes 1" NPT or BSP Systech Illinois have 30 years experience of providing analysis solutions for a wide range of industries. From our manufacturing plants in the UK and U.S we produce gas analysers for industrial process industries, headspace analysers for monitoring gas flushing of food products, and our range of permeation analysers. Systech Instruments Ltd (UK) Illinois Instruments, Inc (U.S) Illinois Instruments (Thailand) Systech Illinois (China) 17 Thame Park Business Centre, 2401 Hiller Ridge Road 6th fl Nopnarong Bldg No7 Room 1105 Forte Building Wenman Road, Johnsburg, Illinois 60051 Ladprao23, Jatujak, Bangkok 10900 No. 910 Quyang Rd, Hongkou district, Thame, Oxfordshire OX9 3XA U.S.A Thailand Shanghai, China 200434 Tel: +44 (0)1844 216838 Tel: +1 815 344 6212 Tel: +66 (0)2938 0798 Tel: +86 21 65533022 Fax: +44 (0)1844 217220 Fax: +1 815 344 6332 Fax: +66 (0)2938 1058 Fax: +86 21 65539651 E-mail: sales.uk@systechillinois.com E-mail: sales.usa@systechillinois.com E-mail: sales.ap@systechillinois.com Email: info@systechillinois.cn www.systechillinois.com www.systechillinois.com www.systechillinois.com www.systechillinois.cn Systech Illinois reserve the right to change specifications without notice. 08/2013