Monicon - S500L - Gas Monitor - Brochure

Features· Microprocessor based· 4-20mA Analogue Output· Voltage free relay contacts · RS485 digital interface· Alphanumeric dot-matrix display· “One Person” calibration· Small size· Certified ATEX II 2 G Ex d IIC T6· Low power consumption· Standalone operationThe Monicon S500L is a high quality, self contained, Intelligent gas sensor that offers a host of sophisticated features to provide fast, reliable warnings against explosive concentrations of combustible gases. The S500L will operate as a standalone instrument or in conjunction with a control-ler or a computer. The S500L is housed in an attractive, compact diameter enclosure and may be configured or calibrated by one person, without declassifying the hazard-ous area. The gas concentration is indicat-ed on a 4-character alphanumeric display which also indicates instrument status. The S500L is fully user programmable and no physical adjustments are necessary dur-ing calibration as the on-board computer assists the calibration procedure. All user variables are stored in non-volatile memory (EEPROM) and retained indefinitely even during total power failure.Typical Applications for the S500L· Oil refineries· Chemical processing· Offshore platforms· Gas processing· Oil and gas storage depots· Gas pipelines· Tank farms· Laboratories· Petrochemical industryS500L Intelligent Gas MonitorThe S500L uses the proven Monicon CGS500 thermocatalytic sensor combined with advanced, surface-mount microproces-sor and firmware technology. Combustible gas oxidising on the surface of a thermo-catalytic element causes an imbalance in a Whetstone bridge circuit. This imbalance is amplified to give a voltage proportional to the gas concentration. This voltage is then processed by the CPU. A watchdog circuit monitors the system operation and resets the CPU if a failure is detected.The S500L is calibrated or user-pro-grammed by activating the magnetic switches with a magnet. The operator is then guided through a variety of options by a user-friendly menu. The CPU constantly verifies system operation. In the unlikely event of a fault, the operator is alerted with a helpful diagnostic display.Supply voltage Nominal 24Vdc (operates from 20Vdc to 35Vdc)Power consumption 2W nominal, 2.3W maximumCircuit protection Electronic current limiter, 1.5A auto-resetTransient Protection PCB mounted, 3 Joule, Metal Oxide VaristorAnalogue output 4-20mA current source referenced to 0VAnalogue output load 500 Ohms maximumOperating temperature -20°C to +60°CStorage temperature -40°C to +66°CHumidity range 5%RH to 95%RH (Non-condensing)Preconditioning Requirements Operational: 30 seconds, Specification: 60 minutesFull-Scale range 0 - 100% LEL (Lower Explosive Limit)Response time (T90) Typically <15 secondsDrift, S.T.P. continuous duty in air <7% over three months (complies with EN50057)Linearity ±5%Repeatability ±2%Resolution 1%Sensor life Typically 5-7 yearsWeight 1.8Kg (including sensor)RS485 operating mode Slave mode, half duplex, polledMax. units on RS485 loop 100RS485 comm parameters 1200-N-8-1RS485 error checking 1 byte checksumUnit interrogation time 40mSRelay contacts SPST, NO, 125V @ 0A5 (30V DC @ 1A) each for A1 & A2Option setting Digital setting (all options fitted as standard and user selectable)Alarm setting Digital setting (fully adjustable between 10% and 90% of full scale)Alarm types Energised/de-energised. Enrichment/deficiency. User selectableATEX certification II 2 G Ex d IIC T6 Tamb -20°C to +60°C (Certificate number Baseefa08ATEX0056)Recommended calibration flow rate 300mL per minuteMounting holes 2 holes, diam 7mm, spaced 127mmUser variable storage Non-volatile RAM (EEPROM)Electromagnetic Conformance (EMC) Complies with EN50081 and EN50082Cable gland entries 2 entries, each M20 x 1.5Terminations PCB mounted terminal blocks to accept 1.5mm2 cableEnclosure material Aluminium pressure die-casting, chromated with blue epoxy finish.Literature supplied 30-page detailed instruction manual with wiring diagramS500L SpecificationsMonicon Technology LtdBallybrit Industrial EstateMonivea RoadGalwayIrelandTel: +353 91 752884Fax: +353 91 752886e-mail: sales@monicon.comweb-site: www.monicon.comS500L-240109-1