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Safe Wireless communication for infrared gas detectors using the ISA100 standard

Safe Wireless communication for infrared gas detectors using the ISA100 standard. Niels Aakvaag, GasSecure March 22, 2012. Agenda. Introduction Principle of detection What are the requirements for safe wireless communication ? Why ISA100?

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Safe Wireless communication for infrared gas detectors using the ISA100 standard

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  1. Safe Wireless communication for infrared gas detectors using the ISA100 standard Niels Aakvaag, GasSecure March 22, 2012

  2. Agenda • Introduction • Principleofdetection • Whataretherequirements for safe wirelesscommunication? • Why ISA100? • Whataretheissues and how have wesolvedthem • Installations present and future

  3. GasSecure develops the first wireless, infrared hydrocarbon gas detector • Features: • High reliability – SIL2 incl. SafeWirelessTM communication • Continuous monitoring with two years battery life • Fast response (5 s) • No recalibration Control room Gateway GS01 GS01 GS0x GS01 GS01 GS01

  4. Wireless gas detectors will increase safety by higher coverage and installation flexibility, and...

  5. … reduce system costs with 60% to 80% 60-80% 70% 15% 5% 20% 80% 10%

  6. Challenge From 5 W to 0,005 Wpower consumption • A new detection method • Optical sensor completely redesigned • Smart use of wireless standard MEMS optical filters

  7. A new proprietary detection method using ultrasonic pre-warning The optical sensor is only awake when the air composition is changing and for self testing Ultrasonic sensor N Y gas > 2500 ppm N HC gas > 5000 ppm Opticalsensor Y Alarm

  8. Optical design

  9. Wireless instrument classes (Modified ISA Table) Source: Simon Carlsen, Statoil

  10. Communicationrequirements from end-users • SIL2 • Multihop support • Max 2 second latency from node to controller • Based on a standard • 2.4GHz

  11. Choiceof standard: WiHARTvs ISA100 • Other major differences: • In ISA 100, the end devices can request contracts with the gateway in order to obtain a certain Quality of Service. • ISA has definedfive hopping sequences, HART onlyone. • ISA supports fragmented packets, in HART this needs to be done by application • WiHART to be supported by GasSecure ifsufficientdemand

  12. Safe message characteristics • IEC61508 dictatesfourmechanisms for safe communication • ProfiSAFEsupports all

  13. SafeWirelessTM: SIL2-rate safe wirelesscommunication • Initiated from controller • Max 2 seconds latency from gas detection to packet at controller • Max two hops • Safe communication over grey channel • Message: • Gas concentration • Temperature • Battery status • Diagnostic Safe request 1 Safe response 1 Safe request 2 Safe response 2 Safe request 3 Safe response 3

  14. Challenge and solution • Combinecontradicoryrequirements: Lowenergyconsumption rapid response • Solution: Asymmetricalbandwidthallocation We reserve more bandwidthuplink, butonlyuse it wheneverit'srequired.

  15. Modes ofoperation Controller Gateway GS01 Controller Gateway GS01 request (x) request (x) Gas response (x) 18 s 20 s response (x) request (x+1) response (x+1) request (x+1) response (x+1) request (x+2) response (x+2) request (x+2) PROFIsafemessage ISA100 message

  16. Processsafety time • 60 seconds, defined by IEC60079-29-1 • With safe messageevery 20 seconds threeattempts • If no safe messagewithinprocesssafety time: • Detectorset to safe state • Marked as unavailable to control system • Operator interventionrequired to resume

  17. RSSI Currentinstallation • Kårstø gas processing plant • Seven detectors PER

  18. Futureinstallations • Gullfaks C. • Rig operated by Statoil. • 20 detectors • Schedule: August 2012 • Tor. • Rig operated by Conoco-Phillips. • 20 detectors • Schedule: October 2012

  19. Summary Detector • Dual detectionprinciple (US and IR) gives fast response and lowpowerconsumption Wireless communication • SafeWirelessTMwithasymmetricbandwidthallocation • ProfiSAFE Wiredcommunication • ProfiNET • Integration done with ABB • Close cooperationwith: • Statoil, Conoco-Phillips, NIVIS, ABB, Yokogawa, and others

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