1 / 9

CEDAR PMT Array DCS

CEDAR PMT Array DCS. (Tim). Summary. Summary of DCS monitored parameters based on original scheme Major part of heat dissipation in electronics / PMTs at each light guide Recent developments (removal of pre-amps and provision of local NINO boards needs some consideration

nerice
Download Presentation

CEDAR PMT Array DCS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CEDAR PMT Array DCS (Tim)

  2. Summary • Summary of DCS monitored parameters based on original scheme • Major part of heat dissipation in electronics / PMTs at each light guide • Recent developments (removal of pre-amps and provision of local NINO boards needs some consideration • Currently just a ‘monitoring’ system • Any control (eg. chiller) set manually or by dedicated systems (eg. Huber chiller control s/w) CEDAR DCS

  3. DCS & DSS • Assumptions • Some software / hardware system exists to log range of parameters of different types. • Monitored data can be displayed via on-screen panels. • Monitored data logged at intervals to storage • Alarm events • Can have different levels of severity • Pass through into data stream • Require operator to RESET • There exists a separate Detector Safety System • Prevents failures causing BIG PROBLEMS! CEDAR DCS

  4. CEDAR PMT ARRAY DCS CEDAR DCS

  5. Evolution • Removal of pre-amps from light-guide arrays does not eliminate all heat sources (PMTs & custom PMT bases) • Still need (would like) temperature sensor at each light guide position (need to think about location) • Local NINO boards • Assume these are mounted within the PMT array enclosure but separated from the Light-guides (eg. on the sides). • Assume • Power ~ 30 mW/PMT channel = 8W per side • Two boards • One 4-wire T sensor per board • 4 extra 4 wire T sensors CEDAR DCS

  6. Inventory of Monitored Parameters CEDAR DCS

  7. Alarms • Critical – cause immediate power down of all LV & HV systems & automatic call to expert • Chiller Flow LOW • Chiller Outlet Pressure LOW or HIGH • Chiller Outlet Temp LOW or HIGH • PMT Encl. N2 Flow LOW (x2) • Warning - • Any (PMT Encl. Temp – CEDAR Temp) LOW or HIGH • Any (PMT Light Guide Temp – CEDAR Temp) LOW or HIGH • CEDAR gas pressure LOW or HIGH CEDAR DCS

  8. DSS • May be more relevant for operation with H2 – but should think about it now • Should be a stand-alone system separate from DCS but should also send signal to DCS • A DSS alarm should result in an (automated) action which makes the system safe (primary concern is human safety) • DSS Inputs • H2 concentration within PMT array enclosures (2) • Enclosure door HV interlock (2) • ? CEDAR DCS

  9. Remarks • Preliminary set of monitoring points defined • Need to review to make sure it’s the right list • No local DCS expertise • Need advice on DCS signal input modularity and types • Need software support to configure DCS databases & develop display panels, messages, alarm screens, etc.. • Would need DCS system operational locally during assembly of PMT arrays to check out individual sensor performance and to estimate suitable monitoring point measurement frequencies. CEDAR DCS

More Related