542 Programmable Gas Analyser Capable of measuring almost any combination of gases; hydrogen, helium, oxygen, carbon dioxide, methane, carbon monoxide, argon, nitrogen and many others. Applications Gas Mixing Welding Gases Heat Treatment Atmospheres Hydrogen/Helium Purity Food Packaging Gases Features & Benefits Programmable for different gases Diagnostics Built-in linearisation Insensitive to sample flow Fast response Computer communications Excellent stability Autoranging electronics Built-in alarms and analogue outputs Built-in auto-calibration The 542 is a versatile, programmable gas Calibration settings, for each combination analyser, based on the principles of of gases used, are stored in an internal thermal conductivity, capable of measuring memory and are recalled automatically almost any combination of gases. The every time a particular gas mix is required. instrument is especially suitable for This enables quick and easy switching measurements of mixtures containing between gas combinations. hydrogen or helium. Sophisticated microprocessor electronics With the use of sensitive floating circuits, enable the fastest possible response time, the thermal conductivity analyser can excellent stability and flexibility. Sample detect gases down to parts per million pressure and flow are internally controlled levels and up to full concentration. The allowing connection to a wide range of analyser is pre-programmed for a wide pressurised samples. Automatic calibration range of sample and reference gases, is included as standard, when the easily selectable from the simple front instrument can be set to perform a zero panel menu. and span calibration at timed intervals. Principle of Operation All gases conduct heat at a specific rate, When the measured gas concentration known as the thermal conductivity of the changes, the sample detector will detect a gas. Matched pairs of heated filaments are change in the thermal conductivity and will installed in a large thermal mass detection cause an imbalance in the Wheatstone block, one set in the stable reference gas Bridge, resulting in a signal output and the other in the measured sample gas. proportional to the change in gas concentration. The signal is processed by Each of these detectors form part of a state of the art digital electronics and the Wheatstone Bridge powered by a constant results shown on a high resolution digital current source. LED display. Technical Specifications Ranges Dependent on selected gas mix. Adjustable, auto-ranging. Typical: 0-1000ppm (H2 in N2) 98-100% (O2 in Ar) Resolution 0.5% or better Accuracy ± 2% of scale* Response Time 90% of reading in 20 seconds Calibration Range 0-100% of selected measure gas. Automatic timed calibration as standard. Auto zero. Measuring Cell Type Thermal conductivity/katherometer, ultra stable Alarms Two adjustable alarms with volt-free, change-over contacts Fully configurable over complete range. Contact rating 10A at 240V ac/30V dc Analogue Outputs 0-10V, 4-20mA (both isolated). Max loop resistance 500 Ohms Serial Interface Allows connection to a computer Operating Conditions Sample Inlet Pressure 1.0 to 7.0 Barg Sample Flow Rate Internally controlled (max 250ml/min) Sample temperature -10 to 40°C Ambient Temperature -5 to 50°C Sample Connections 1/8" OD compression fittings (others on request) Unsuitable gases Corrosive gases (contact factory for alternatives) Power Requirements Power Supply 230/115V ± 10%, 50/60Hz at 40VA Display Type 4 digit high visibility LED and 12 digit alphanumeric Cabinetry and Mounting Enclosure Sheet steel Installation Bench or panel mounting (3U - 19" rack) Dimensions 535W x 165H x 300D (mm) panel cutout 445W x 132.5D (mm) Weight 12kg Ingress Protection IP40 Options Sample Gas Pump Externally mounted IP55 Enclosure Sealed Reference Gas Dependent on application and range (contact Systech for options) Corrosive Gases Contact Systech Illinois for information on alternative options. *Note: The 542 can be used to measure over 400 gas combinations. Some gas combinations can be measured in ppm but others can only be measured in percent levels therefore please contact the sales department for typical values. The accuracy of the instrument will be ± 2% of scale of the stated typical value. Systech Instruments Ltd (UK) Illinois Instruments, Inc (USA) Illinois Instruments (Thailand) Systech Illinois (China) 17 Thame Park Business Centre, 2401 Hiller Ridge Road 6th fl Nopnarong Bldg No7 Room 519, No.3 FuCheng Building Wenman Road, Johnsburg, Illinois 60051 Ladprao23, Jatujak, Bangkok 10900 No. 900 Quyang Rd, Hongkou district, Thame, Oxfordshire OX9 3XA USA 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 Email: sales.uk@systechillinois.com Email: sales.usa@systechillinois.com Email: m.pitak@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. 03/2012