Daya Bay RPC Gas System User`s Manual
Contents
1. nm 16 65 400 9 Tole s T 85440 imi teh 5 2 C4H10 SF6 C2H2 4 ARGON 55 5 4 6mm ADAPTER Panel 19 W x 18 304 Stainless Steel Fig 7 Block diagram of the gas mixing panel 3 A TES From gas cylinders CE c P i Fi i um J TA F y x r i Fi E E i Fo X yf Pi i P T foe ce C Ir TS LN E mal E i fi T AT d Pall 1 um i 8 1 r i ij 7 LN lt r Qmm tld LI CEY CL z E d E me Fs 1 i iid Y EI LU m E LL Lu a T Reserved for venting mixing panel Fig 8 Schematic of the gas mixing panel The gas mixing panel has incorporated the BaBar RPC LST gas system experience and Daya RPC system s requirement This mixing panel can mix 4 gases including small amount of SFe which is in 0 5 of total flow rate level To mitigate the possible down time due to malfunction of the gas flow controllers the major part of the system is constructed with the Modular Platform Components MPC and surface mounted on a substrate All components can be replaced from top that makes replacement easier and faster There are two additional o2. 28 FEF Fig 30 Digital bubbler photogate PC board schematics The hardware of the16 channel digital bubbler with the oil catcher is shown in figure 31 Fig 31 16 channel digital bubbler with oil catcher The schematic of the microcontroller readout test board and its picture are shown in figure 32 B C Figure 33 is a photo of this system 29 XIN XOUT Dec DVeg Aec HSTNMI Pe Pa Pa Ps Pe re F NUS m um a um 4 XT2IN Tone no no T pamm mm Ind 16 Reg 16 Bit MEB Bit f1 7 gt iba 25 TMS Hardware ipli DMA Watchdog pear Gone Timer TDI TCLK MEY 5 3 Channels TDO TDI 15 1e Bit Timer B7 2 Timer A3 Comparator WSARTo 1 Fis 300 Reg Breewreut i BSL Interface Fig 32 B Digital bubbler readout board schematic HEADER 12 30 Bubbler Readout Boord July 2008 Through flat cables connect to bubbler photogate with 7 USB to RS232 converters Fig 33 Digital bubbler readout crate and its host PC with USB extender 100 ft long CAT SE cable 31 The cable interconnection of the digital bubbler system is shown in figure 34
3. digital bubbler photog ate boards Digital bubbler readout crate T Port USE Hub LIS B extender LIS B extender up to 100 t CATSEcable LISBto RS523Z canwerter cable Fig 34 Interconnection of the digital bubbler system The host PC will be in electronics room the digital bubbler hardware and readout crate will be located on the RPC module supporting platform the distance between two locations 1s around 20m Use of the USB extender and one 100 ft CATSE cable should be long enough to link them together 2 3 3 TI microcontroller readout software 24 software development tool for the TI microcontroller readout board is AR Embedded Workbench The version 3 30A 15 a free distributed version Please don t upgrade to newer free distributed version that won t work properly for the bubbler readout program Click File Edit View Project Tools Window al ED 4e 48 By Workspace 2 x JL NAH 4 Fig 34 IAR Embedded Workbench window Click File on the top menu bar then OpenlWorkspace the bubbler software workspace is in the following directory C Bubbler16ch TI Readout bubbler16ch v2 eww The opened workspace is shown in Fig 35 The program is written in C 33 F AR Embedded Workbench View Project Took Window v Do amp 6 Daya Day yas system digital bubbler readout Based ou EMP1 Rocket Lab program toss B 6chv3 De th
4. gt 5 3 a H GAS PRESSURE CRATE TO HV INTERLOCK CONTROL FLOW LOW INTERLOCK Fig 12 Logic block diagram of four gas control crates 2 2 2 1 Gas flowmeter crate The gas flowmeter crate is used to display the gas flow rate from four mass flow controllers and three flow meters which are for the water vapor control branches total dry branch and water vapor added branch Simpson model H335 controller unit is used for the flow rate display and safety control A normal flow rate band is defined for each of seven flow meters through the Simpson controller if the flow rate is out of this preset band the build in relay of the Simpson controller will be acting accordingly Figure 13 shows the schematic of this crate See Appendix 2 Flowmeter E pdf for large scale schematics 13 AS FLOWMETER CRATE Fig 13 Gas flow meter crate Flow rate display meters P din Pd Flow rate signal N 4 flow rate 7 Yes Flow interlock from flow meters signal to pressure a P d Flow rate signal to slow control Flow interlock bypass 5 push to actuate Fig 14 Logic diagram of the flowmeter crate 14 This crate displays the gas flow rate measured by the flow controllers meters controls a relay contact that closes on normal flow rate and opens on bad flow rate Send this signal to gas pressure crate which will control the solenoi
5. Data copy in Flash starts here Sdefine FLASH COUNT 057000 counter for the iteration 8 SED 67 The ves hinne al ove sehe un a Wed rubra bubblerTeckiev3 i 4 Resdy in 19 Coll Fig 35 Workspace of TI microcontroller readout software bubbler16ch v2 eww 2 3 4 Digital bubbler GUI To open the digital bubbler GUI go to directory C DayaBay Bubbler GUI as shown in figure 36 click setup exe it will bring up the bubbler GUI window as shown in figure 37 please be advised the Date Modified of setup exe might be different from what we show here You also can simply click Daya Bay RPC Gas Bubbler icon popup the same window Daya Bay Bubbler GUI File Edit View Favorites Tools Help Back 2 Search 25 Folders Address C Daya Bay Bubbler GUI Size Date Modified File and Folder Tasks ication Fi File Folder 2117 2010 9 12 Princeton 2008 application Application Manifest 211712010 9 12 AM Other Places setup exe 456 KB Application 211712010 9 12 AM ge Local Disk C Documents Shared Documents E Computer My Network Places Details Description Setup File Version 9 0 21022 8 Date Created 1 25 2010 3 28 PM Size 455 Computer Fig 36 Directory of the digital bubbler GUI program 34 Bay Princeton 2009 Program Dept of Physics Princeton University File Chart Help Program Day
6. Draft V 1 1 Daya Bay RPC Gas System User s Manual C Lu K McDonald W Sands S Chidzik M Peloso Princeton University 5 2 2010 Table of Contents Introduction Daya Bay RPC gas system 2 Gas cylinders 2 2 Gas mixing and fire detector safety monitoring system 2 2 Gas mixing panel 2 2 2 Gas flowmeter crate 2 2 3 Gas pressure crate 2 2 4 Gas system power supply crate 2 3 Gas distribution system 2 3 1 Flow resistor and inlet overpressure protection bubbler 2 3 2 Digital bubbler 2 3 3 Digital bubbler program 2 3 4 Access the data with database program MySQL v5 0 Interface to the datector control system Troubleshooting 5 Appendixes 1 SystemLogic E pdf SystemLogic E dwg 2 Flowmeter_E pdf Flowmeter_E dwg 3 Pressure_E pdf Pressure_E dwg 4 Powersupply E pdf Powersupply_E dwg 5 UL compliance Marking of Gas_PanelsV2 xls 6 msp430f1611 pdf gt WW References 1 Introduction baseline RPC gas mixture is Ar R134A Isobutane SF6 65 5 30 4 0 5 1 which has been approved by Daya Bay safety officer as a non flammable gas The RPC gas system will be similar to that used in the BELLE 2 and BABAR 3 experiments in which gas mixing system distributes the gas mixture to the individual RPCs through simple flow resistors with the output flow from each flow branch being separately monitored by a low cost digital bubbler 4 Mixing of the chamber gases is performed with mass flow
7. should be off The water branches are used for adding water vapor into the gas mixture There are three Simpson meters to display the flow rate for branch 1 2 and the total Branch 1 gas mixture will be bubbling through water then combine with the dry gas mixture from branch 2 The metering valves on branch 1 and 2 can adjust the flow ratio between them thus adjust the water vapor content in the mixture Figure 15 shows the picture of the front and rear panels of the flowmeter crate Fig 15 Gas flowmeter crate A Front B Rear C Internal front D Internal rear 15 2 2 2 2 Gas pressure crate The gas pressure crate is used for displaying the gas pressure at the upper stream of the flow controller for each gas The gas pressure sensor 1s Swagelok S model transducer that uses psi Gauge reference PTI S NG50 35AQ it means the ambient pressure will read as 0 psi When any gas shows lower than preset pressure limit this crate will generate warning signal shut off the solenoid valve that will in turn shut off all gas inlet ports on the gas mixing panel Figure 16 shows the schematics of this crate The pressure can be adjusted by four gas regulators on the gas mixing panel All gas pressures are maintained around 20 psi don t let the gas pressure goes higher than 23 psi since at higher pressure isobutane might be liquefied at lower temperature Go to web site http e data jp vpcal2 e to calculate the vapor pressure f
8. status 24 gt solenoid valve G power out from MKS gas flow meters Flowmeters analog output to flowmeter crate 15V 15V DC powers Fig 20 Logic diagram of the gas system power supply crate Power supply crate provides DC power 15V to three MKS flow meters It also provides 24V DC power to the solenoid valve It takes status information from flow crate pressure crate then controls RPC interlock and solenoid power output In case of abnormal state occurring such as low flow rate low pressure warning it will actuate the RPC HV interlock shut off solenoid valve There are four lights on the front panel 15V 15V 24V solenoid Valves open In normal case all of them should be on Figure 21 shows the front and rear panels of the power supply crate B A i E 4 i i z in S ae PIS a Fig 21 Gas power supply crate A Front B Rear C Internal front D Internal rear 2 2 24 Gas status crate Fig 22 shows the gas status crate The front panel of the gas status crate is divided into two regions the right region displays RPC gas system status and the left region is fire safety system status 19 Gas system status region shows 1 Actual weights of isobutane R134A and SF6 gas cylinders and their weight low warning LEDs Any of these three gas cylinders hits its preset low weight limit this warning red LED will light up to warn yo
9. turned the solenoid valve off Buzzer activated Bypass button has been pushed After 5 it will turns off automatically unintentionally Histograms show COM port lost connection 1 Check COM port communication Start all zero Control PanellS ystemlHardwarelDevice Manage click Ports COM amp LPT to see if all required COM ports are there and in right Order Unplug the USB cable then plug in sometime it may solve the problem 2 Sometime the electric interference such as plug a new device into the same power strip may disturb the COM port communication The above method may also solve the problem No data file saved possible minor software bug may Restart the Bubbler GUI may solve In the relevant be the cause a single bad data this problem Will fix the software bug subdirectory blocked the following data file operation but the database records are OK Solenoid Valve Check with detector control Open LED not system to make sure they are not on no any other activating the emergency shut off warning light state and the wall mounted fire on but there is emergency push button is not on no gas flow in all 4 channels 5 Appendixes 1 SystemLogic_E pdf SystemLogic_E dwg 2 Flowmeter_H2 pdf Flowmeter H2 dwg 3 Pressure_H2 pdf Pressure_H2 dwg 4 Powersupply_H3_1 pdf Powersupply H3 l dwg 5 status 4 pdf status 4 dwg 6 UL compliance All parts used in the gas system are checked for the
10. will bring up a MySQL Query Browser window as shown in figure 41 MySQL Query Browser 1 2 12 is Mysl Query Browser Connect to MySQL Server Instance Stored Connector Server Host 3305 Username Password Default Schema Fig 41 MySQL Query Browser window In this window the name of Server Host should be replaced by the host PC s IP address such as 128 112 84 90 which 1s the IP address of the host PC on Princeton network and type in the password Click OK a Query Browser window will pop up as shown in figure 42 38 MySQL Query Browser Connection root localhost 3306 dayabay File Edit View Query Script Tools Window MySQL Enterprise Help Execute iQ hResulset1 Schemata 9 dayabay gt m dyb_gas_dybfarbubbler b m dyb gas dybfargas b m dyb_gas_dybnearbubbler 22 dyb gas dybneargas b gt dyb gas lanearbubbler b m dyb gas laneargas gt information schema b mysql b newtest Syntax B Data Definition Statements Data Manipulation Statements ic MySQL Utility Statements B MySQL Transactional and Locking B Database Administration Statements gt gt Replication Statements 22 SQL Syntax for Prepared Statements Fig 42 MySQL Query Browser intial window On the right pane of this window under database dayabay there 6 tables dyb gas dybfarbubbler Move mouse to any table s name click and hold then move the point t
11. 0 sccm Flow Ch 4 Argon Ar 0 2000 sccm N Flow The gas flow controllers have been calibrated by soap bubbler The calibrated Scaling Control Fact SCF for four channels is summarized in Table 1 Channel Gas Full Gauge Gas Calculated Setthe rear Calibrate range for factor Correction Scaling Scaling d at flow sccm Factor Control Control rate Factor Pot sccm SCF r 6 Table 1 Gas flow controller s parameters Obtained from http www teledyne hi com Manual Flow 11 1 052007 20Nall 20Mass 20Flowmeter pdtf The Gas Correction Factor listed in the table is calculated for 0 C temperature for other temperature it should be corrected as follows G C F T4 G C F 0 C x 273 T41 273 Scaling Control Factor SCF are shown on the 247D rear panel potentiometers The SCF is the product of the Gauge Factor for the MFC in use and the Gas Correction Factor for the gas in use SCALING CONTROL FACTOR GAUGE FACTOR x GAS CORRECTION FACTOR The calculated SCF in the table assumes T 21 5 C In this table the calculated SCFs and the set SCFs have some discrepancy The set SCF means adjusting the rear Scaling Control Pot full range 16 1000 to this value the displayed flow rate will be same as calibrated flow rate There are certain level of discrepancy between the set value and the calculated value Be aware when we make the comparison we only care about three numbers in the set value no
12. 1 106 111 56 Tl al 61 BB channel ol 11 16 21 26 31 38 41 46 B 1 4 w o flow resistors in front of each board ZH sur qqna 66 91 96 101 106 111 Tl al Ju channel 6 1l 16 Zl 1 24 One panel branch of gas distribution digital bubbler system 1 sketched in Fig 26 A its Fig 25 The gas bubbling rate distribution for 112 channels Top plot with the flow resistors photo is in Fig 26 B bottom plot w o the flow resistors To exhaust 16 branches gas mixture from mixing system Over pressure protection bubbler gas bubbler al 16 branches D Fig 26 A One panel branch of gas distribution digital bubbler system Lane 1 Marana Fig 26 B Gas distribution bottom and digital bubbler top panels 2 3 1 Flow resistor and inlet overpressure protection bubbler We have calculated the pressure drop AP for the RPC gas flow path The RPC itself won t bring in noticeable pressure drop due to large cross section The major pressure drop is coming from 25 the long tubing CERN web site provides a calculator to calculate such pressure drop http detector gas systems web cern ch detector gas systems Tools deltaP htm Figure 27 shows the verification of this calculator with some real test done by Bob Messner of BaBar Since the pressure drop 15 proportional to d a small variation of t
13. 371 Flow rate SLM BEEN Y 08834x 0 2127 15 2 2 5 Bubbling rate Hz Fig 45 Gas flow rate vs bubbling rate 2 3 6 The developing tool of the GUI Microsoft Visual Studio 2008 The GUI 15 written in C with the software development tool Microsoft Visual Studio Click Start on Windows then click the icon pc on the left pane this icon also available on the desktop Visual Studio 2008 window will pop up as shown in figure 46 41 Start Page Microsoft Visual Studio File Edit Profiler Tools Test Window Help Start Page Object Browser sat Microsoft Visual Studio 2008 Recent Projects Get News from Microsoft Daya Bay Princeton 2008 Download the latest information for developers to the Start Page Click here to enable an RSS feed that provides regularly updated articles about new technologies product tips and tricks and upcoming events This live Feed also includes information about service packs community technology previews and Beta releases of Microsoft products and technologies To view the Microsoft Privacy Policy go to Tools Options Environment Help Online and then click Read the privacy statement Open Project Create Project Getting Started What s new in Visual C Create Your First Application How Do I Learn Visual C3 Download Additional Content MSDN Forums Visual C Developer Center Extend Visual Studio Visual Studio Headlines 2 Error List E Code Defi
14. 5 0 69 0 68 0 68 0 44 0 52 0 gt 13 newtest 2010 02 23 14 29 26 0 64 0 55 071 0 64 0 68 0 58 0 54 0 2010 02 23 14 35 27 0 64 0 53 0 7 0 66 0 61 0 6 0 2010 02 23 14 41 27 0 62 05 0 69 0 63 0 71 0 58 0 2010 02 23 14 47 28 0 62 0 57 0 69 0 64 1 0 61 0 2010 02 23 14 53 28 0 64 0 54 07 0 65 0 66 0 59 0 2010 02 23 14 58 28 07 0 65 0 2010 02 23 15 05 29 0 65 04 2010 02 23 15 11 29 07 1 23 0 2010 02 23 15 17 30 0 54 D 2010 02 23 15 23 30 0 63 0 2010 02 23 15 29 30 0 65 0 2010 02 23 15 35 31 0 67 0 2010 02 23 15 41 31 0 65 0 2010 02 23 15 47 32 0 66 0 2010 02 23 15 53 32 0 72 f 0 ic Data Definition Statements 2010 02 23 15 58 32 0 64 0 Data Manipulation Statements 2010 02 23 16 05 33 0 66 0 5 B MySQL Utility Statements 2010 02 23 16 11 33 0 66 MySQL Transactional and Locking 2010 02 23 16 17 34 0 63 0 Database Administration Statements 2010 02 23 16 23 34 0 67 0 Replication Statements 2010 02 23 16 29 35 0 68 0 SQL Syntax for Prepared Statements 2010 02 23 16 35 35 0 66 0 6 A 760 rows Fetched in 0 15825 0 02015 Last Search Syntax 1 1 Fig 43 MySQL query results window The database table consists of 113 columns Date_Time the data created Date and Time DBOICI DBO7C16 total 112 columns each column records the bubbling rate for the corresponding channel Cli
15. B flash memory The build in 12 bit ADC can sequentially sample 8 channels of the input at one moment with the sampling rate set by a 32768 Hz 2 9 watch crystal oscillator When the ADC finishes the sampling for the first 8 channels it will generate a switch signal that subsequently will be sent to two MAX4674 multiplexer chips each of which can handle 4 channels Thus the next 8 channels will be sampled by the ADC The system will be running for a few seconds that is long enough to collect several cycles of the bubbles All the data 15 stored in the RAM memory of the microcontroller At the end of the data taking cycle the program will set all 8 bits up to 1 for a specific register UITXBUF that is the serial port interface on the microcontroller A host PC is supervising the microcontroller readout board through RS232 port It checks U1TXBUF routinely if all 8 bits are up it will readout the data from RAM and store the data in the PC then starts over the whole process again A USB extender pair 15 used to connect the USB port on PC to a USB hub with 7 USB slots The CATSE cable used to connect the pair of USB extender can be as long as 1008 Each USB slot through a USB to RS232 convertor cable 1s connected to a digital bubbler readout board For the far hall we need 11 16 channel bubblers and for the near hall we need 7 16 channel bubblers Therefore at near hall we only need one such hub and at far hall we need two hubs to handle all digital bubblers
16. D70 Souriau SM20ML1D70 Souriau SC20ML1D70 Tyco 1 5747299 4 Molex 09 50 3031 Molex 09 50 3061 Molex 26 60 4060 Molex 08 52 0113 Molex 22 23 2061 Molex 10 11 2083 Molex 10 11 2063 Molex 10 11 2043 220V 220V 220V 220V lt 5V lt 5V 220V 220V 12V 24V 24V 24V 24V 220V 220V 220V 220V 220V 220V 220V 220V 220V 15V 24V 24V 24V 24V 24V 24V 24V 24V 24V 24V 24V 24V 24V 15V 220V 15V 15V 15V 220V 15V 24V 220V UR is a UL symbol for components UL UR CSA CE UL UR CSA CE UL UR CSA CE UL UR UL UR CSA UL CSA UL UR CSA UL UL UR CSA UL UR CSA UL UR CSA UL UR CSA ULCSA ULCSA ULCSA UL UR ULCE ULCSA UL UL UL UL UL UL UL UL UL UL UL CSA UL UL UL UL UL UL UL Power Crate Power Crate Pressure Crate Interlock Crate Pwr amp Press Pwr amp Press Pwr amp Press All All Power Crate Pwr amp Press Pwr amp Press Pressure Crate Pressure Crate Pressure Crate Interlock Crate Interlock Crate Interlock Crate Interlock Crate Interlock Crate All Interlock Crate Press amp Interlock Press amp Interlock Interlock Crate Interlock Crate Interlock Crate Power Crate Power Crate Pressure Crate Interlock Crate Inter amp Pwr Inter amp Pwr Inter amp Pwr Inter amp Pwr Pressure Crate Pressure Crate Pressure Crate Pressure Crate Pressure Crate All All All All All All All Power Crate
17. IXINING SYSTEM PRIMARY SUPPLY BACKUP INLET i SUPPLY INLET Vs Fig 4 Manual gas switchover panel used for isobutane isobutane gas switchover panel is installed in the gas cabinet shown in figure 5 To Gas mixing panel me Fe Fig 5 Isobutane gas switchover panel mounted inside of the gas cabinet The solenoid valve controls the isobutane gas outlet In emergency case the gas control system will shutoff the power of this valve therefore no isobutane gas will flow into the gas mixing panel Operation procedure of this panel 15 as follows The primary gas supply cylinder is weighted by an explosion proof digital scale when its weight drops to a preset limit the status crate of gas control system will show a warning light at the same time the detector control system will issue a warning sign on shifter s monitoring screen to remind the shift taker to replace the depleted isobutane cylinder Follow the steps below to replace the cylinder 1 Check the weight of the backup isobutane cylinder make sure this cylinder has enough isobutane left over If its net weight is less than 516 replace this cylinder first then replace the primary cylinder otherwise direct proceed to step 2 2 To replace the depleted isobutane cylinder first shutoff Vpl and Vp2 valves then open Vs and Vs2 valves Now the backup cylinder is temporally supplying isobutane to the gas mixing panel 3 Close t
18. M STATUS CRAT D Se ES DESCRIPTION 48 Appendix 2 Flowmeter_H2 pdf Double click on the plot will show the original pdf n ha nu 5 2 49 Appendix 3 Pressure_H2 pdf Double click on the plot will show the original pdf file fut Sij AJ U o 70 m o o c A m gt m Appendix 4 Powersupply_H3_1 pdf Double click on the plot will show the original pdf GAS FLOWWME TIER CIA E RICH a 52351 20 02 bags 9 n P in REV ZONE DESCRIPTION jORW CHK DATE 7 PROECTON Appendix 5 status_H1_4 pdf Double click on the plot will show the original pdf file WORTILATION BDXIHCLIC DLFFENCH Pee d a 118 md EPEE ee ee ey ee LONE a E JN DUM i i i i E SSS N NOTES 1 TO SLOW CONTRI EACH PAIR WILL BE OPEN AT A ARM STATE e HEX CUNMEL TOS SENJ SLOHMALS IU SLOW CONT SUL 22 Appendix 6 UL marking of gas system control crates components QTY DISTRIBUTOR DISTRIB it MFG PN VOLTAGE MARKINGs Data Sheet or Web Page PART Discription AS
19. Power Crate Power Crate Power Crate Power Crate Power Crate Pwr amp Press Power Crate Pwr amp Press A similar device 247C has past BNL safety te 53 Appemdix 8 SOLO XT150 digital scale manual SOLO XT CHLOR SCALE 150 150 Cylinder Platform Scale with Solo XT Indicator INSTALLATION amp OPERATION TTI LISHE ive Ceni Ca is D AA E PET FORCE FLOW BET TAME CY Ree i WHH Read XT150 manual pdf for the details 54
20. RE 5 RPC GAS SYSTEM STATUS 4 STATUS p EMERGENCY aon re be SHUTOEF b TT ISOBUTANE SCALE C Iu PRESSURE FLOW RATE LN LOW y G GAS HUMIDITY MIHA CHITO LFY mt LJ 831 2835 R134A SCALE SFE SCALE E a Fig 22 Gas status crate A Front Rear Internal front D Internal rear E Internal left F Internal right 21 5 N EX MANES NISC X LN ACK AACA EN Se EE He SRR ET r AA T SN eM IN T CCIN RAIN RET es SAA ET EU HERES CTT A c AIR VELOCIT Y IN FEET PER MINUTE GAGE READING WITH PITOT TUBE VELOCITY PRESSURE IN INCHES OF WATER Fig 23 Air velocity vs gauge reading with Pitot tube The gas mixture flowing out of the mixing system needs to be distributed to every RPC in an experimental hall The design goal of the gas distribution system can be summarized as follows e Uniformly distribute the gas mixture to every RPC in the system Divide the RPC gas flow in one experimental hall into several panel branches of which each will be further split to 16 sub branches In case of one sub branch having leaky RPC the rest of the system should not be affected Atthe end of e
21. SEMBLY 12V converter 15V 15V converter 24V Power Supply Piezo Transducer LED Lenses LED Cable Assembly LEDs Fuse Holder Fuse Relay khau 17d11 12 Relay Socket 14Pin RELAY RETAINING CLIP Relay khau 17d13 24 Relay krpa 11dn 24 Relay Socket 8Pin Relay krpa 14ag 240 240V Relay Socket 11Pin Relay Hold Down Clip Panel Indicator Red Panel Indicator Green Power Socket PushBotton Switch Simpson H335 Terminal Block 8 Timer 0 15 min Pot 5M Ohms 2W Knob Dial PCB for DB15 Conn Chassis 17 x 5 25 x 14 Chassis 17 x 7 x 14 Chassis 17 x 10 5 x 14 Conn Circular 19 Conn Circular 19 Wall Mount Conn Circular 19 Cable Clamp Size 16 Cable Clamp Size 12 Conn Circular 8 Conn Circular 8 Wall Mount Conn Circular 8 Wall Mount Conn Circular 8 Cable Clamp Size 10 Conn Circular 4 Wall Mount Conn Circular 4 Crimp Pin AWG26 24 pkg25 Crimp Socket AWG26 24 pkg25 Crimp Pin AWG22 20 pkg25 Crimp Socket AWG22 20 pkg25 Conn DB15 Conn Housing 3Pin Conn Housing 6Pin Conn Header 6Pin Crimp Term AWG20 18 pkg100 Pin Header 6Pin Conn Housing 8Pin Conn Housing 6Pin Conn Housing 4Pin MKS 247D 4 channel readout box PPP RP RP RP e WINN WNN PRP RP NN PU UG NPN PRP RP PIP NP RP RP RP RP PN Newark Newark Newark Allied Newark Newark Newark Newark Newark Avnet Newark Newark Newark Newark Newark Newark Newark Allied Allied Newark Allied Newark Newark Newark Allied Ne
22. Stts crt J3 Ventillation status switch alarm C normal 4 otis crt J Ventillation status DC current 4 20mA 4 Stts crt J3 Emergency shutoff out switch click set reset 10 Stts crt J4 Flow rate status switch alarm C normal 1 Stts crt J4 Pressure status switch alarm C normal 2 Stts crt J4 HV interlock switch alarm C normal 7 Stts ert J6 R134A weight DC current 4 20mA 5 JO Isobutane weight DC current 4 20mA 5 otbs crt JO SF6 weight DC current 4 20mA 5 Stts crt J9 Humidity fresh DC level 0 5V 6 Stts crt J9 Humidity return DC level 0 5V 6 Weather information Tong Guan U Temperature storage 8 Tong Guan U Humidity storage 8 Tong Guan U Atm pres storage 8 Tong Guan U Temperature mi x 8 Tong Guan U Humidity mix 8 Tong Guan U Atm pres mix 8 Digital bubbler LAN bubble rate Database Database 9 GC430 LAN Gas mixing ratio Database Database 4 Warning The table shown above might be only part of its original excel file to get the excel file Table 2 Signals sent to Detector Control System please move the mouse at any place inside the table and double click the original excel file will show up You can move to any cell to look at the content in that cell The slope column lists various physical parameters such as weight air flow velocity of isobutane Lower Exposure Limit LEL relative humidity etc and their calibration curves S
23. a MFC The rear panel provides four connectors via cables they are connected to four mass flow controllers The following test results are obtained with Daya Bay gas mixture Since isobutane is a flammable gas its ratio in a gas mixture needs to be strictly controlled below its flammable limit Unless you are experts and authorized to do the system adjustment you are not supposed to touch ANY of the dials knobs and switches on both front and rear panels Otherwise you might change the mixing ratio and make a flammable gas mixture without your notice Please take it seriously The only thing you are supposed to do if you are on shift is choosing each channel by rotating the channel select knob and read the digital meter Compare these numbers with the preset value and the displayed numbers on Gas Flowmeter Crate all three sets of numbers should be very close The Simpson controllers on Gas Flowmeter Crate have been adjusted at the total flow rate of 2000sccm If you are running the system at different flow rate these readings might be somewhat different from 247D and could be a few percent of deviation This 1 due to the fact that Simpson Controller is only making linear extrapolation for running at different full ranges but 247D will have more sophisticated correction The operation of MKS 247D 15 set in the ratio mode the channel 1 Isobutane is the master channel the other three channels are slaves On the front panel the Set Poin
24. a_Bay_Princeton_2009 Status Port Serial Number i The default directory is To change these go to File Options Retrieve Data Default Download Directory C Chanqe Directory Download Data Minutes Stop The Timer 20 1 Fig 37 Bubbler GUI window Click File on the top menu bar will bring up a drop down menu with five choices Open open the executable TI microcontroller acquisition program and wait for uploading to its flash memory Close close the Bubbler program the Bubbler Program window will disappear immediately Check communication test the RS232 connection between microcontroller and the host PC in this version the COM ports we used are starting from COM21 up in case of bad communication you may want to check the host PC Ports setting which can be accessed through Start Control Panel System Hardware Device Manager Ports COM amp LPT Click on sign on the left of Ports it will expand the Ports to show all Com Ports where you can check if COM Port names from 21 up in sequential order Option select the number of boards to be used in the run Set Check Serial Number Set each COM Port with a unique name and upload the executable TI txt file to the readout board connected to this Port In the following we ll go through the process step by step 1 Click Open select file C bubbler16ch TI Readout Debug Exe bubbler16ch txt and click it
25. ach sub branch should implement a monitoring device to check the gas tightness for this sub branch The Daya Bay near hall gas distribution digital bubbler system consists of seven panel branches A sketch diagram of this system is shown in figure 24 22 n FAURE gsip jey Ejusunradxa 2 2 a 3 g m B 5 9 o 3 0 8 5 50 uU J saz E 3 o m gt 2 o 2 gt or 3 Fig 24 Daya Bay near hall RPC gas distribution system part We split the gas flow into 7 panel branches with a gas distribution manifold that is shown in the insert of Fig 24 Because it 1s hard to control all downstream gas flow resistors having same flow resistance it has been revealed that some distribution panels are having higher flow resistance than others so the overall flow rate for 7 panel branches won t be the same It can be seen in Fig 25 bottom plot The solution 1 adding an additional flow resistor to each branch of the gas manifold These flow resistors are made of 5cm long 0 5mm ID 5 5 tubes With these flow resistors the 22 uniformity of the bubbling rate distribution among all 112 channels is much better see the top plot of Fig 25 lt CO wo cw odo amp xm 89119919 66 91 96 10
26. ain 5 Click Run button it will run the uploaded program on the readout boards you have selected the LEDs in front of these boards will flash for a few seconds On right pane of the window 21 is working 127 is working displays the progress as shown in figure 39 Daya Bay Princeton 2009 Program Dept of Physics Princeton University File Chart Help Program Daya Bay Princeton 2009 Status Port Serial Number Oe The default directory is CN To change these go to File Options Retrieve Data Default Download Directory Download Data Minutes Stop The Timer 20 3 Fig 39 GUI finishes the data taking 36 6 Wait for a few more seconds to let the microcontroller finish the data taking then click Download Data button If the data taking process has not finished while you move the mouse point over Download Data button it won t change shade of the box and has no effect if you click The data in RAM memory of the microcontroller will be transferred to host PC meanwhile the progress bar on top of Status pane will show the transferring status Upon finishing the data transfer a 12 column plots will popup Each plot shows 16 vertical bars each of which represents the bubbling rate for its corresponding sub branch Click on each histogram a larger histogram will popup which 15 clear enough to read the bubbling rate Click X sign on the upper right corner of the large plot will close this wi
27. chover panel is equipped For the argon gas an automatic gas switchover panel is used it is shown in figure 2 For the other three gases the manual switchover panel 15 employed shown in figure 3 2 1 1 1 Automatic switchover panel Fig 2 Argon cylinder automatic switchover panel a Front b Rear Side Operation procedure of this panel 15 as follows The illustration of various parts of this switchover panel is sketched in figure 3 SYSTEM PRESSURE LINE REGULATOR ET TC SYSTEM c ee CET IL oR MS SUPPLY 7 PRESSURE Q a ae SUPPLY 2 PRESSURE 29 ad E gt f Nod P 5 X SELECTCR in Lt REGULATOR bL SUPPLY E Fig 3 Illustration of various parts of argon automatic switchover panel Once installed and before pressurizing ensure that 1 The line regulator is in the shut or closed position by turning the hand knob counter clockwise until it stops 2 The selector regulator knob is fully turned to the inlet port of the bottle that you wish to use first After connect the argon gas manifolds to each side of the panel and all argon gas cylinders are hooked up to the manifolds use the ResTek Leak Detector careful check and fix any leakage immediately Purge the connecting pipe every time the gas cylinder has been replaced and the air has entered the pipe Each side the panel provided a VENT valve which is shown in figure 2 c Open the i
28. ck File and highlight Export Results click it on the drop down menu you can select various file format For example if you want to export the data to Excel format click the fourth line If you already checked the Query Options Open results in associated application after export Click Tool menu then Options it will direct open an Excel file with the data set you have selected A sample Excel strip plot is shown in figure 44 we can see the bubbling rate distribution among 112 channels measured by the digital bubbler is reasonably uniform The flow rate vs bubbling rate from 500sccm to 3 5slm range 15 shown in figure 45 Below 2 SLM the linearity 15 quite good thereafter the flow rate becomes lower than linear extrapolated value it could be the gas volume for each bubble might not be same under different flow rate Below 2 SLM the linear fitting is F R SLM 0 883 x 0 213 above 2 SLM the fitting becomes quadruple SLM 0 713 x 2 75 x 4 44 where x is the bubbling rate in Hz unit 40 Flow rate 3 5 SLM 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 82 85 88 91 94 97 100103106109112 channel Fig 44 Bubbling rate distribution of 112 channels y 0 7134 275 44
29. controllers The electronic bubbler system monitors the chamber gas flow by counting gas bubbles in a small oil bubbler as they pass a photogate The output gas bubbling rate will be sent to a centralized MySQL database Any other authorized networked PC can obtain all data through this MySQL database Four gases will be input from four auto manual switchover panels to minimize interruptions of the gas flow during chamber operation The gas mixing ratio is also tested once every two hours by a local GC Varian GC430 The test results are stored into the same MySQL database On the local gas control PC the bubbling rate and gas mixing ratio are displayed and updated An extensive detector safety and fire safety system with status monitors and interlocks is implemented via four gas control crates gas flowmeter crate gas pressure crate gas system power supply crate and the gas system status crate 1 Daya Bay RPC gas system The gas system building blocks are shown in figure 1 In the following sections we ll describe each block in details gas cylinders gas distribution crates RPC chambers gas mixing panel and control crates gas tubing cable DCS system Fig 1 Daya Bay RPC gas system building blocks 2 1 Gas cylinders 2 1 1 Gas cylinder switchover panel Four gases are used for Daya Bay RPC gas mixture To eliminate the down time when the depleted gas cylinder is replaced for each gas line a gas swit
30. d valve The abnormal flow rate pressure signal will shut off the solenoid valve which in turn will close all gas inlets to the mixing panel In reality the gas flow rate pressure fluctuation due to power supply glitch and or atmospheric pressure sudden change 15 quite often during certain season To eliminate this type of interfere there 15 a BYPASS TIMER push button push this button can bypass the status check logic for 5 minutes meanwhile a buzzer will be actuated to remind you that the bypass 16 acting keep the solenoid valves open for such time period Usually within this period the environmental fluctuation would calm down and return to normal therefore the gas system will continually operate w o interrupt When you see all flow rates and pressures show normal value the Simpsons show no warning signs on the right side bar you should push the RESET START button and the Flow Interlock OK green light should be back on There is a RESET START button on the front panel When the entire gas system is just powered up push and hold this button down until all seven flow rates displayed on the Simpson meters reach normal value no warning sign on any of the meters then release the button By doing this the system will lock itself in a normal operation mode until the next abnormal state occurs After you push this button the green light labeled as Flow Interlock OK should be on Also the water branches green light should be on red light
31. displays of LEL measured by HAD 1 and 2 gas cabinet air ventilation velocity HAD sensor 1 is installed at lower section inside of the gas cabinet HAD sensor 2 1s mounted outside of the gas cabinet They have been calibrated to of isobutane LEL When the measured level reaches 10 LEL the warning LED will turn on If the level reaches 25 LEL the solenoid valve that controls the opening of all four pneumatic valves in front of each gas inlet will shut off thus all gas inlet ports on the gas mixing panel will shut off The gas cabinet air ventilation is monitored by a Pitot tube which 16 installed inside of 6 diameter ventilation pipe This 6 long ventilation pipe 1s hooked up to the exhausting port on the top of the gas cabinet At the end of this pipe a 6 diameter explosion proof fan is used to suck the air out of the gas cabinet By measuring the air flow velocity in the ventilation pipe we ll be able to tell if the air flow rate meets the Uniform Fire Code requirement 150 200 linear ft min of air through the window opening The window opening is 13 x 17 7 8 x area of 6 diameter pipe therefore the minimum air flow velocity needs to be 1100 ft min The manufacture provided curves of air velocity vs gauge reading with Pitot tube are shown in Fig 23 We set the ventilation warning limit at 0 075 water which 1s corresponding to 1100 ft min air flow velocity gt http www dwyer inst com PDE files 160 IOM pdf 20 FI
32. e origine Rocket Leb code wes written by Vassilios Papethanakos D bubblel6ch V2 c Department of Physics Princeton University This new program is created on Feb 5 2008 C Lu E hubbiel6ch v Use sequence of channels instead of single channel method to run the 3 28 2008 C Lu bubble Geh V2 r So far maximum 9 Channels can be readout by this mode couldn t make 16 Channels work in this 1 in430 h sequence of chamels xoda Therefore readout 16 channrls has to be completed 2 steps channele step B h Tata code has been tested with res bubblers 3 31 2008 C Lu I E msp430x1Gx h Total data points are 250 only record the time mark at beginging of each record line WeIt 100 used between H stdlib h two data points 9 9 2008 C Lu L B sysrnach Removed the date tranafer frog RAM to flash memory 12 1 2008 Lu e f bubbleri amp ch 2 bubbitI ich r include cintrinsicsa h gt 8 4304 143 Pinclude lt msp4J0x 16x Ip gt m Ink 430F1611 xcl Finclude lt stdlib t gt L 5 multiplier xcl define _ FLASH Sdefine v 2 1 START type definitions for convinience with microcontrollers typrdef unsigned char BYTE 8 bita 9 typedef unsiqned short WUET 16 bits typedef unsigned long LONCWORD 32 bats for dividing WORD into two typedef union WORD BYTE BORD 5121 WORD BYTE define FLASH DATA 0 5000
33. he isobutane cylinder valve Disconnect the flexible hose from the cylinder remove the depleted cylinder from the scale hook up a new cylinder Open the cylinder valve check the leakage to make sure there is any detectable leakage with leak detector on any relevant connector work 4 Open Vent valve for few seconds to purge the air in the gas pipe then shutoff Vent 5 Close 51 and Vs2 open Vpl and Vp2 Now the primary isobutane cylinder is back to The operation for other two gas switchover panels R134A and SF6 is the same 2 1 2 Digital scale Two types of digital scale are used in this system An explosion proof scale Force Flow SOLO XT 200MAR 1 is used for isobutane cylinder and two regular digital scales Scaletron Model 2310 are used for and SF6 2 1 2 1 Explosion proof digital scale This scale is installed inside of the gas cabinet A pneumatic load cell 1s mounted underneath of the platform through a 12 ft long PVC covered copper pipe the cell 1s connected to a SOLO XT indicator which is mounted on the gas status crate The warning limit for the net weight is set at 516 Please don t touch any button on the SOLO XT indicator or you ll alter the setting which may cause the scale malfunction There are two cell ALKALINE batteries located behind the keypad display To replace the depleted batteries unscrew bezel ring and allow keypad display to fall forward Remove old batterie
34. he tube s ID can make big difference to the pressure drop as illustrated in Fig 26 For the same 1 4 OD tubing the Polyflo tubing has smaller ID its pressure drop is almost twice as higher than Teflon tubing Delta P per 100 af Tubing finches of water Pressure Drop For Tubing 0 5 14 palyflo is 174 OD tubing Delta per 100 af Teflon sisi Er Delta P per 100 of Palyflaw CERN calculator per 100 finches H20 3 es 2 1 4 teflon has a larger ID thant 4 0 29 Inch H20 05 ME NEM NM MM 3 3 DA Dean CU 0 15 inch H20 H 10 20 40 50 BO 0 046 inches H20 Flow rccimin for true 1 4 inch ID tubing Fig 27 Verification of CERN pressure drop calculator This tool can calculate up to three gas components We use it to calculate a gas mixture 66 30 4 Ar R134A Isobutane that is very similar to Daya Bay RPC gas mixture For 2 volume changes day the flow rate in each sub branch 4 RPCs will be 5 6 sccm The calculated pressure 6 Bob Messner private communication 26 drop through 30m long 4mm ID 1 47 OD Polyflo tubing 30m long tubing is about the round trip of the gas flow path AP 0 29cm WC The digital bubbler s oil height is set at 0 5cm Total pressure drop through the system is 0 8cm WC After the flow resistor an inlet bubbler 15 implemented in parallel t
35. ir UL compliance detailed information is summarized in Marking of Gas PanelsV2 xls All parts are UL compliant 7 msp430f1611 pdf 5 430 15 MSP430x16x MSP430x161x Mixed Signal Microcontroller http focus ti com lit ds symlink msp430f1611 pdf 8 SOLO XT Chlor scale 150 installation amp operation manual XT 150 manual pdf 9 Scaletron Model 2310 electronic scale manual 2310 operating instructions pdf See also here http www scaletronscales com pdt 23 1 0 operating instructions pdf References 1 C Lu and K McDonald DayaBay RPC Gas Safety System Design June 19 2008 DocDB 2691 2 A Abashian et al Nucl Instr Meth A449 112 2000 3 S Foulkes et al Gas system upgrade for the BaBar IFR detector at SLAC Nucl Instr Meth A 538 801 2005 4 M Ahart et al Flow Control and Measurement for RPC Gases Belle Note 135 Aug 26 1996 http wwwphy princeton edu marlow rpc gas flow ps 5 A Paoloni et al Gas mixture studies for streamer operation of Resistive Plate Chambers at low rate NIM A583 2007 264 6 Daniel Marlow Glass Resistive Plate Chamber in the Belle Experiment Seminar at Rice University July 9 1999 http wwwphy princeton edu marlow talks rice rice pdf 7 MSP430x 15x MSP430x16x MSP430x161x Mixed Signal Microcontroller Texas Instruments 47 Appendix 1 SystemLogic_E pdf Double click on the plot will show the original pdf um SYSTE
36. low control system can use these curves to calculate the physical parameters from the output analog signals DC voltage or current They should match the display on the controllers of various gas control crates For your convenience we reproduce these calibration parameters as follows Isobutane flow rate 20 sccm V SF6 flow rate 2 sccm V 44 Argon flow rate 2 slm V R134A flow rate 200 sccm V Branch wet and dry and total flow rate 2 slm V Gas pressure P 20 psi V Hazardous gas sensor of isobutane LEL 20 LEL V Ventilation air flow velocity V m min 0 0666 I mA 3 0867 I 53 24 1 434 05 I 1064 5 R134A SF6 weight scales W kg 3 102 I mA 12 465 Isobutane scale W kG 4 119 I mA 16 59 Humidity sensors 20 Ventilation Open alarm Close normal contact Q 0Q Gas flow rate pressure HAD sensor Open alarm Close normal contacts Q 25Q 45 4 Troubleshooting This section is evolving with the running experience your feedback is most welcome All gas flow meters 1 The solenoid valve doesn t open 1 Check if all four gases have show zero flow all pneumatic valves are closed pressures higher than low limits rates 2 Nitrogen gas cylinder does not have 2 Change N2 cylinder enough gas pressure lt 4 atm 3 Any gas channel has lower than 3 Check 247D to see if there is any preset lower flow limit thus shut off switch unintentionally being
37. ncy control The following is a list of items to be sent to the DCS e Gas flow rate for all four components the total flow rate and dry wet branches flow rate for the gas mixture pressure All of these signals are summarized in the table 2 Gas bubbling rate for every sub branches to locate the leaking RPC module Gas mixture humidity Gas pressure before the mass flow controller Cylinder weight for Isobutane R134A and SFe Ventilation air flow rate monitoring HAD sensors monitoring Stand alone weather station device in the gas room will monitor the room temperature air 43 Source Crate Connector Name Signal Type Signal Range Slow Control Flowmeter crate Flow crt 10 Flow rate Isobutane DC level 0 10V 1 Flow crt 10 Flowr rate Argon DC level 0 10V 1 Flow crt J2 Flow rate R1344A DC level 0 10V 1 Flow crt J2 Flow rate SF6 DC level 0 10V 1 Flow crt J2 Total flow rate DC level 10V a Flow ert J2 Branch 81 flow rate DC level 10V 3 Flow crt J2 Branch 2 flow rate DC level 0 10V 3 Pressure crate Prs crt 16 Pressure Isobutane DC level 0 10V 2 Prs crt 16 Pressure Argon DC level 0 10V 2 Prs crt 16 Pressure R134A DC level 0 10V 2 Prs crt 16 Pressure SF6 DC level 0 10V 2 Gas status crate Stts crt 18 HAD sensor status switch alarm C normal 4 Stts ert Jr HAD 1 analog out DC current 5V 4 ert 18 HAD 2 analog out DC current 0 5V 4
38. ndow An example is shown in figure 39 Form3 BE Daya Princeton 2009 hanna Fig 40 Flowrate plots for all 112 channels In figure 37 there are several other buttons The Minutes window is used for setting the time interval between each data taking After click the Download Data button the program will automatically repeat the data download data taking cycle according to this Minutes setting To stop the timer click Stop The Timer button it will halt the program and change the label to Start The Timer Click the button again will resume the program 2 3 5 Access the data with database program MySQL v5 0 37 The bubbling frequency data are collected a database called dayabay table name 15 dyb_gas_dybnearbubbler dyb_gas_dybfarbubbler or dyb_gas_lanearbubbler according to the location of the gas system The raw data files which can be used to plot the pulse curve for each channel are stored in subdirectory C yyyy mmddyyyy hh_mm_ss Each day has a subdirectory such as C 2010 04212010 and each run has next level of subdirectory such as 20 46 43 Files with _p attached are ascii data files which can be directly read by Excel From any networked computer you can access this database if MySQL v5 0 and MySQL GUI Tools software are installed These software can be downloaded from web for free To run the database query click on MySQL Query Browser icon displayed on the left pane after click Windows Taskbar Start button It
39. nition Window 7 1 Bookmarks E Find Results 1 det Find Symbol Results E Solution Explorer Explorer Class View Ready Fig 46 Visual Studio 2008 window On the left side Recent Projects pane there is one existing project name Daya Bay Princeton 2009 move mouse over it on the bottom of the Visual Studio window it will show the solution file s name with its directory tree C Desktop Visual Studio 07312009 Projects Daya Bay Princeton 2008 Daya Bay Princeton 2009 sIn click it it will open the entire solution project as shown in figure 47 42 29 Daya Bay Princeton 2008 Microsoft Visual Studio File Edit Refactor Project Build Debug Profiler Data Tools Test Gl P422 Tyne Dj XR gg 2008 3 3 4159 GU ParseData cs Constants cs InsertData cs Window Help Debug Any CPU GraphBubbler designer cs Bubbler cs Settings Designer cs download FileSystemHandler cs Rg Daya Bay Princeton 2009 Bubbler v DownLoadData 15 using System using System Collections Generic using System Ling using System Text using System IO Ports using System IO using System Windows Forms OLS at CRM Solution Explorer Daya Bay Princeton 1 X k3 in e amp od Solution Daya Bay Princeton 2008 1 projec E Solution Items 1 z se Daya Bay Princeton 2009 H References 42 Service References app config AssemblyInfo cs c B
40. nlet isolation valve on both supply sides then slowly open the vent valve let argon gas flowing through the pipe for a few seconds thus the leftover air will be carried away from the pipe Close the vent valve afterwards Repeat this procedure for other side of the panel Now the manifold is fully pressurized and ready to supply the downstream system The outlet pressure will be shown on the line regulator and controlled by its knob rotating the knob clockwise to increase the pressure When the supply side pressure drops to 100 psig the selector regulator is then internally switched to the other side of the gas supply The respective inlet pressure gauges show two sides gas pressures therefore the operator will know which side is depleted and can replace the bottles To change the depleted bottles Shut off the main isolation valve on the depleted side Turn the selector knob so that it is now pointing towards the full bottles side Shut off the valves on all bottles of depleted side Replace the depleted bottles Open the main isolation valve on the just replaced bottle s side Purge this side supply line Now this side is fully prepared to be used in next round of switchover 2 112 Manual switchover panel Two types of manual switchover panel are used one with the solenoid valve at the outlet shown in figure 4 is used for Isobutane gas the other one w o solenoid valve is used for both R134a and SF6 TO GAS M
41. o the empty window on the top several buttons will show up on the bottom of the window One of the buttons is SELECT move the point to there then release the mouse a command line SELECT FROM gas dybnearbubbler d automatically created in this empty window click the Execute button on the right the database window will fill up with the recorded data for the selected table as shown in figure 43 39 MySQL Query Browser Connection root localhost 3306 dayabay File Edit View Query Script Tools Window MySQL Enterprise Help Q9 SELECT FROH dy bg as d ybnearbubbler d 1 2 Vx Refresh Execute 7 Resultset 1 Schemata Date Time BDOICI BDOIC2 BDOIC3 BDOICA BDOICS BDOICE BDOIC BDOICB A 2010 02 23 13 27 32 0 0 0 0 0 0 0 A dayabay 2010 02 23 13 35 23 0 66 0 54 0 66 0 65 0 69 0 59 0 54 gt I db ges cybferbubbler 2010 02 23 13 41 23 0 62 0 54 0 69 0 66 0 74 0 59 0 51 0 VB iocos diss 2010 02 23 13 47 23 0 58 0 57 07 0 66 0 66 0 6 0 52 04 gt dyb gas dybnearbubbler 2010 02 23 13 53 24 0 62 0 63 07 0 67 0 67 0 59 0 54 0 gt 3 dyb gas dybneargas 2010 02 23 13 59 24 0 61 0 44 0 68 0 62 0 72 0 59 0 52 D gt dyb gas lanearbubbler 2010 02 23 14 05 25 0 64 0 59 0 67 0 61 0 68 0 57 0 53 04 gt 2 dyb gas laneargas 2010 02 23 14 11 25 0 63 0 55 0 63 0 66 0 65 0 58 0 52 0 3 information schema 2010 02 23 14 17 25 0 61 0 56 0 71 0 64 0 64 0 58 05 0 3 2010 02 23 14 23 26 0 68 0 5
42. o RPC it 1s used as the inlet overpressure protection for the RPC We set the overpressure protection bubbler at 3cm WC We use Upchurch Scientific U 101 S S tube as the flow resistor which 1s 0 01 bore diameter and 5cm long The pressure drop with normal flow rate would be 29 cm WC that 1s more than 100 times of the pressure drop for 30m long 1 4 Polyflo tubing it means the flow resistance for the entire gas flow path 1s dominated by the flow resistor Figure 28 shows an inlet protection bubbler crate Each crate consists of 16 channels For each channel a straw tube is dipped into an oil well with a depth of 3cm The inlet gas pressure will be manifested as the gas column in the straw tube above the oil level 1ndicated as h in the insert The maximum inlet pressure will be limited at 3cm oil If the gas pressure overpasses this limit the gas mixture will escape through this protection channel thus the RPC chambers won t suffer the overpressure Gas column above the oil level its height indicates the inlet gas pressure 011 well nil leuel nil leuel in strau Fig 28 Gas inlet overpressure protection bubblers 2 3 2 Digital bubbler For a gas detector system the oil bubblers are always used at the outlets of the chambers to isolate the gas chamber from air Besides this basic function the digital gas bubbler can provide a quick on line diagnosis of gas flow according to BaBar and Belle it turns out to be a very useful s
43. or Isobutane At 20 C the vapor pressure of isobutane is 2267 55mmHg if the ambient pressure is 760mmHg the pressure sensor should read as 29 psi At 15 C the vapor pressure should read as 22 88 psi If we set the pressure at 23 psi when the room temperature drops to 15 C Isobutane vapor will start to be liquefied Only the lower limit for the pressure display control Simpsons is set the upper limits are set at much higher value under no circumstance such over pressure warning will occur If the pressure is below the lower limit it means the gas cylinder will be completely depleted in short time you should check the cylinder immediately In normal case this scenario shouldn t happen because we have set the automatic switchover pressure at much higher value for argon and weight limit at 216 for other three gases Before hitting these four preset limits the gas pressure should be stable ii m e gm 4 1 RPC GAS PRESSURE CRATE Fig 16 Gas pressure crate See the catalog page of the pressure sensor http www swagelok com downloads webcatalogs EN MS 02 225 pdf See Appendix 3 Pressure E pdf for details 16 The logic diagram of this crate is shown in figure 17 Pressure display contro meters Flowrate status OK Y N flow rate status Signal from pressure sensors pressure OK pressura status flow rate and pressure status Pressure signal to slow control press
44. s and replace with new ALKALINE batteries Carefully reinstall keypad display Screw bezel ring down until finger tight to insure proper sealing The PVC coated copper pipe is filled with fluid which is used to transmit the pressure from load cell to the sensor in the indicator Please don t disassemble the fittings on this pipe otherwise the fluid in the tube will be leaking out the scale will loose its accuracy Detailed operation manual can be found in the Appendix 7 2 1 2 2 Regular digital scale The other two digital scales are Scaletron model 2310 electronic single cylinder scale they are used for R134A SF6 The procedure for replacing the depleted cylinder is similar to the previous scale we won t repeat here Detailed information about this scale can be found in the Appendix 8 2 2 Gas mixing and control system After the cylinder switchover panels four gases are connected to the inlets on the gas mixing panel via 6mm Swagelok fittings This system consists of gas mixing panel and four crates flowmeter crate pressure crate power supply crate and gas status crate 2 2 1 Gas mixing system 2 2 1 1 Gas mixing panel The picture of the gas mixing panel 15 shown in figure 6 and the block diagram 15 shown in figure 7 Figure 8 shows the schematic of the mixing panel 9 N KCPIEFSMA2P 10000 PT S NG50 5AQ O 2 5 2 3 gt LV 4MW 8 B 3 SLV 4MW 4
45. t Source Switch 1s set at Ratio position for channel 2 3 4 and at Flow position for channel 1 If you need to change the total flow rate and maintain the mixing ratio unchanged you only need to change the flow rate of the first channel by adjusting its potentiometer Set point on front panel of 247D A Varian 430 GC system has been used to verify the mixing ratio Test results show that from 100sccm to 1000sccm of the total flow rate the mixing ratio holds reasonably well as shown in figure 10 A We also tested the gas mixture in different total flow rate for a 2m x 1m IHEP RPC the plateau curves are very similar see figure 10 B That means the gas mixing ratios in the mixtures are pretty much similar 100 10 Mixing fractioln 0 200 400 600 800 1000 1200 Total flow rate sccm Fig 10 A Gas mixing fraction in different total flow rates OPERA gas mixture 11 120 100 80 60 40 e 0 2005 a 9 5005 14A aff 25 1000sccm 6000 6400 6500 HV V Fig 10 B Efficiency plateau of a 2m x 1m RPC chamber in different total flow rate OPERA gas mixture 2 2 1 2 Water bubbler Based on BaBar RPC running experience we decide to add 4000ppm water vapor into the gas mixture The original gas mixture 1s split into two branches one branch of the gas will be bubbling through water The water vapor saturated gas mixture 15 then mixed
46. t their absolute value For example we now set the rear pot of argon channel at 035 we also can set it at 350 the front LED will give you one more digit display accuracy but limited by the maximum number 2000 can be displayed if we do need the flow rate greater than 2000sccm we have to reduce the rear pot to 035 as we do here Power ON OFF Switch Flow Indicator Flow Control Digital Panel Meter LED Switch Zero Control 1 Set Point Source Switch Read Set Point Switch Set Point Control 247 eemks 4 Channel Readout 2 3 4 o on p 241 aa Flow h Set PL Flow AE Flow Flow cS JE 426 de BE Qe GING Off Read Read Ext Read Ext Displa Channel Decimal Point SEMIS aminas Selector Switches Line Voltage Selector AC Line Cord Interface Connector J5 MFC Connectors N J4 ae Interface Connector J6 Channels 1 4 Fig 9 MKS 247D four channel readout box Top front panel Bottom rear panel 10 Detailed information on using this box be found from MKS 247D Four Channel Readout Instruction Manual Here we just give a brief description of this control box MKS 247D is designed as power supply readout and set point source for four analog mass flow controllers The 247D unit consists of a power supply four signal conditioning channels four set point circuits and a digital panel meter DPM to display the flow rate of any single channel of
47. to highlight then click Open 2 Type 21 into the small window under Port BDO1 must be capital BD into the small window under Serial Number click Upload TI txt File button 1t will upload the txt file to the microcontroller s flash memory When finish the window should look like figure 37 The TI txt file will remain in the flash memory until you upload a different TI txt file to change it If you have 7 boards you need to repeat this procedure for other 6 boards 33 Ed Daya Bay Princeton 2009 Program Dept of Physics Princeton University File Chart Help Program Daya_Bay_Princeton_2009 Status serial Number p BDO1 Upload TI txt File Com is working PragramC sbubble1B5ch TI HedaurDiebug E xe bubbler Bch v2 bat Pragram starting at 16364 240 bytes Programm starting at 1 5524 240 bytes Program starting at 16964 240 bytes Program starting at 17104 240 bytes Program starting at 17344 240 bytes Program starting at 1 504 240 bytes Retrieve Data Program starting at 1 7824 102 bytes Program starting at 65534 2 bytes 1544 bytes programmed BOOT Default Download Directory cena Download Data Minutes Stop The Timer 10 Fig 38 The TI microcontroller data acquisition program has been uploaded to board 71 3 Click x on the upper right corner of the window to close it 4 Open the bubbler GUI again as mentioned at the beginning of 2 3 3 the window shown in figure 37 will appear ag
48. u it is the time for replacing the depleted gas cylinder Two adjustable black knobs are used to zeroing R134A and SF6 scales Place an empty gas cylinder on scale then adjust the knob until displaying 0 0 on the weight window By doing this the measured weight on the scale will be the net weight of the content left in the cylinder The low weight limit has been set at lkg If the net weight reaches 1kg the respective weight low LED will turn on The isobutane scale is different because of its flammable nature A Force Flow XT200MAR 1GC digital cylinder scale 1s used The cabinet platform with hydraulic load cell is installed inside of the gas cabinet Since there is no electrical element is used for the load cell it 1s safe in the hazardous environment The SOLO XT digital indicator is mounted in the Gas Status Crate which 1s located outside of the gas cabinet through a 6 ft long tubing filled with pneumatic fluid the indicator 1s connected to the load cell Although a quick connector is used at the indicator side we can easily disconnect the tubing from the indicator but don t leave it disconnected for more than 5 minutes 2 Relative humidity of the fresh gas mixture flowing into the RPC module and the return gas mixture flowing out the RPC module Two gas sub branches are monitored By rotating the Gas Humidity switch the of relative humidity for channel 1 or channel 2 will be displayed on the Simpson controllers Fire safety system region
49. ubbler cs D c 95 namespace Daya_Bay Princeton 2009 10i 115 public class Bubbler 12 13 14 15 16 17 18 22i 23 24 25 57 ei u S Find Results 1 gt 4 private byte blkin new byte Constants MaxDataBytes private byte blkout new byte Constants MaxDataBytes private byte serialNumberbBlkin new byte 32 Receive buffer string BoardName ParseData p GraphBubbler GraphBubblerData MainForm localMainForm FileSystemHandler localFS new FileSystemHandler public MicrocontrollerCommunication localMicrocontrollerCommunication SerialPort Port InsertData locallnsertData new InsertData Dictionary lt int SerialPort gt AllPorts new Dictionary lt int SerialPort gt public Bubbler MainForm ParentForm localMainForm ParentForm ir Error List xd Code Definition Window Bookmarks Find Results 1 Find Symbol Results Constants cs FileSystemHandler cs lt 5 Form4 cs c Gases cs GraphBubbler cs GraphGasMixture cs InsertData cs EE MainForm cs 4 MainForm designer cs M lt Ez Solution Explorer Class View Properties Ready Ln 152 Col 21 Fig 47 Solution Daya Bay Princeton 2008 opened in Visual Studio 3 Interface to the Detector Control System DCS Daya Bay RPC gas system will send signals to the detector control system for on line monitor and emerge
50. ure to power crate control flow rate solenald valves Fig 17 Logic diagram of the gas pressure crate The gas pressure display and control is also accomplished by Simpson H335 controllers In case of either flow rate or gas pressure is out of normal range this crate will send signal to power supply crate to shut off the solenoid valve and consequently shut off all four gases This crate sends the analog signals of gas pressure to slow control system for on line display The front and rear panels for the pressure crate is shown in figure 18 Fig 18 Gas pressure crate A Front B Rear C Internal front D Internal rear 17 2 2 2 3 Gas system power supply crate The power supply crate provides the DC power to all flow meters solenoid valves Figure 19 shows its schematics irim STST CETTE TER CFTE EF Plu Doe TROLS Let Tai MLE EE 24 Ms PLO EF fie B Lo TAE EZ TOES METH IS PL SETTE GAS POWER SUPPLY CRATE Fig 19 Gas system power supply crate The logic diagram of this crate is shown in figure 20 t See Appendix 4 Power E pdf for details 18 RPC HV interlock from fire safety fire safety flow flow rate gas SS rate pressure OK pressure
51. utlet ports on the lower left corner in figure 8 One port is connected to a GC system to check the gas mixing ratio once every two hours The other port is reserved for venting the gas mixing system in certain circumstance Please be advised that when you are doing the venting additional gas tubing must be provided between this port and the room ventilation pipe All four gas inlets are controlled by pneumatic valves labeled as pav 70 in figure 8 which are actuated by pressurized air or nitrogen cylinder at 100 1 via a solenoid valve The later is controlled by the power supply crate that will be mentioned later With this arrangement all gas components will be turn on off at the same time the mixing ratio won t be changing after the system interruption The pressure sensors pt 60 in figure 8 will send the output signal to the gas pressure crate where the signals are compared to the preset normal pressure operating range and displayed on the Simpson controllers Mass flow controllers send the measured signal to the flowmeter crate where the flow rates are checked if they are within the preset normal ranges The mass flow controllers are MKS products Four mass flow controllers are controlled by MKS 247D see figure 9 Full flow ranges of the gas flow controllers and flowmeters are as follows Ch 1 Tetrafluoroethane C2H2F4 0 5000 sccm Flow Ch 2 Sulfur Hexafluoride SF 0 100 sccm Flow Ch 3 Isobutane 0 50
52. wark PCBExpress Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark Newark MKS 72K1628 72K0352 72K1614 854 0047 26K6372 88K1063 67 0275 26K8480 16M9048 27E166 57F3402 16M9052 21F1087 57F3431 21F1098 57F3432 57F3400 679 9768 679 9771 94F083 814 1069 60M3124 28F717 86K9982 753 1248 95F7003 16F5736 16F5728 16F5744 16F5825 16F5823 16F5734 16F5726 16F5718 16F5742 16F5822 16F5725 16F5733 93K6211 88K2682 93K6208 88K2677 42K6543 38 8766 38 8769 13 2876 35 3725 27 1933 13 2635 35 6565 13 2636 Lambda ZWS5 12 Lambda SCD601515 Lambda ZWS10 24 Mallory SC250PR VCC CMS442CTP PK10 VCC CNX440X024112 PK10 Littelfuse H3453LS7 Littelfuse 313xxxP Tyco KHAU 17D11 12 Tyco 27E166 Tyco 200217 Tyco KHAU 17D13 24 Tyco KRPA 11DN 24 Tyco 27E122 Tyco KRPA 14AG 240 Tyco 27E123 Tyco 20C176 CML 1031D1 CML 1033D5 Switchcraft EAC309 IDEC AB6M M1P G Simpson H335 4 13 2 2 0 Cinch 8 141 ARTISAN CONTROLS 438US Honeywell 53C35MEG EHC EH712F2S 29 sq Proline 10 006 Proline 10 010ca Proline 10 018ca Souriau UTG616 19PN Souriau UTGO16 19S Souriau UTG616 19SN Souriau UTG16AC Souriau UTG12AC Souriau UTG612 8PN Souriau UTGO12 8S Souriau UTGO12 8P Souriau UTG612 8SN Souriau UTG10AC Souriau UTGO10 4S Souriau UTG610 4PN Souriau SM24ML1D70 Souriau SC24ML1
53. with the dry gas mixture in the other branch By adjusting the flow rate in two branches we can easily obtain the water content in the gas Figure 11 shows a picture of this system water vapor added gas mix gas mix dry branch gas mlx wet branch bubbler reservlor Fig 11 Water bubbler The left tank 1s the water bubbler gas mixture 1s flowing through a sintered metallic bubbler head and entering the water getting saturated water vapor in it then flowing out the tank The right tank is used as a water reservoir There is a tube connecting two tanks through a valve Keep the water level in the reservoir always higher then the level in the water bubbler Anytime if we need to add water into the bubbler we only need to open the valve and let the water flow from reservoir to bubbler 12 2 2 2 Gas control system The gas control system includes four crates they are Gas flowmeter crate Gas pressure crate Power crate and Gas system status crate The logic diagram is shown in figure 12 _ SYSTEM STATUS CRATE I cro p a a 4 3 he i 5 AIR VENTILATION e POWER SUPPLY CRATE gt m a x 2 INTERLOCK lise no f un TO SOLENOID VALVE m ee FROM GAS CONTROL PRESSURE HAD SENSORS gt PRESSURE PANEL AIR FLOW PRESSURE OK 4 5 gt D
54. ystem We use a similar digital bubbler design as Belle RPC used 6 In this system the bubblers are instrumented with photogates Its working principle is illustrated figure 29 Without gas bubble the light reaches the photogate through oil without interruption When bubble passes it will reflect partial light and the light intensity at that moment would be reduced thus generates a pulse signal to the photogate PC board 27 s Channel fe To digital bubbler i Sane readout board I a a a an em cm cm m m 3000 mw A TEE TET RAN LR rr fal i i A 500 signal 0 02 0 4 06 0 8 1 1 2 1 4 time sec Figure 29 Digital gas bubbler A Mechanical structure of the bubbler for illustration purpose only not the same as used in our gas system B Working principle of the photogate C The digital bubbler output signal recorded by microcontroller it shows 8 A schematic of the digital bubbler photogate PC board 15 shown in figure 30 This is a 16 channel board that provides input signal to the microcontroller readout board Each of the microcontroller board can handle 16 channels TI MSP430F1611 7 microcontroller is used on the board figure 31 A shows the functional block diagram of MSP430x161x chip It has 10KB RAM and 48K
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