Technical Bulletin, Communicating with Instromet Q.Sonic Ultrasonic
Contents
1. Page 9 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Table 6 32 bit IEEE Floating Points Previous Hour s Average Data Table 7 32 bit IEEE Floating Points Previous Day s Average Data Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 Number of samples taken 17537 17637 17737 17837 Number of samples taken 17568 17668 17768 17868 Path 1 valid sample 17538 17638 17738 17838 Path 1 valid sample 17569 17669 17769 17869 Path 2 valid sample 17539 17639 17739 17839 Path 2 valid sample 17570 17670 17770 17870 Path 3 valid sample 17540 17640 17740 17840 Path 3 valid sample 17571 17671 17771 17871 Path 4 valid sample 17541 17641 17741 17841 Path 4 valid sample 17572 17672 17772 17872 Path 5 valid sample 17542 17642 17742 17842 Path 5 valid sample 17573 17673 17773 17873 Path 1a AGC level 17543 17643 17743 17843 Path 1a AGC level 17574 17674 17774 17874 Path 1b AGC level 17544 17644 17744 17844 Path 1b AGC level 17575 17675 17775 17875 Path 2a AGC level 17545 17645 17745 17845 Path 2a AGC level 17576 17676 17776 17876 Path 2b AGC level 17546 17646 17746 17846 Pat2. 3486 Path 1b AGC ratio 3164 3264 3364 3464 Path 4b AGC level 3187 3287 3387 3487 Path 2a AGC ratio 3165 3265 3365 3465 Path 5a AGC level 3188 3288 3388 3488 Path 2b AGC ratio 3166 3266 3366 3466 Path 5b AGC level 3189 3289 3389 3489 Path 3a AGC ratio 3167 3267 3367 3467 Path 1a AGC limit 3190 3290 3390 3490 Path 3b AGC ratio 3168 3268 3368 3468 Path 1b AGC limit 3191 3291 3391 3491 Path 4a AGC ratio 3169 3269 3369 3469 Path 2a AGC limit 3192 3292 3392 3492 Path 4b AGC ratio 3170 3270 3370 3470 Path 2b AGC limit 3193 3293 3393 3493 Path 5a AGC ratio 3171 3271 3371 3471 Path 3a AGC limit 3194 3294 3394 3494 Path 5b AGC ratio 3172 3272 3372 3472 Path 3b AGC limit 3195 3295 3395 3495 Number of paths 3173 3273 3373 3473 Path 4a AGC limit 3196 3296 3396 3496 Number of samples taken 3174 3274 3374 3474 Path 4b AGC limit 3197 3297 3397 3497 Path 1 valid sample 3175 3275 3375 3475 Path 5a AGC limit 3198 3298 3398 3498 Path 2 valid sample 3176 3276 3376 3476 Path 5b AGC limit 3199 3299 3399 3499 Path 3 valid sample 3177 3277 3377 3477 Path 4 valid sample 3178 3278 3378 3478 Notes AGC Automatic Gain Path 5 valid sample 3179 3279 3379 3479 Control Integer with t
3. 9 Compliant Q 3 5 Meter s a SPU Universal data message used by Series lll and Series IV meters af UPRLA e Q Sonic 2 3 4 5 Q QL Meter Stand alone SPU e Q Sonic 2 3 4 5 QL Meter SPU RU II III The customer is responsible for ensuring their Q Sonic meter is configured to use the proper data type NOTE The Q Sonic 4 must be configured for Code 37 to communicate with the OMNI Flow Computer If set to Code 35 or 36 communications will fail Flow Computer Configuration The flow configuration settings that are specific to the Q Sonic flow meter are entered in the miscellaneous configuration meter run menu and the meter run setup menu You must enter the miscellaneous configuration meter run settings first and then proceed to the meter run setup entries These configuration settings can be entered either via the OMNI Flow Computer s front panel keypad or using OMNICOM configuration PC software Chapter 2 Flow Computer Configuration in Volume 3 of the OMNI User Manual and the Technical Bulletin TB 960701 52 0000 0001 Overview of OMNICOM Configuration PC Software Miscellaneous Configuration Meter Run Settings The following miscellaneous configuration meter run settings correspond to the Q Sonic ultrasonic gas flow meter e Select Flow meter Device Type Enter 4 for each meter run that you want to select the Instromet Q Sonic flow meter as the device type e Select SV Module Port The OMNI Fl
4. 09 April 2009 DCR 090102 C 12 November 2009 DCR 090311 D 04 April 2012 DCR 120012 52 0004 0001 Rev D Y Omni Page 14 of 14
5. 1 2 2 3 3 V G P T a n S 1Gas Vel 2Gas Vel 3Gas Vel Sw AgcLlevel w AgcLevel AgcLlevel W W SONI C 1234 e I OI OI OI OI OI O UT O HI HOT A A OF 01 U1 UT eE O WO OT UT e DDN O ON FF WY UW UW UW WY OW OI I FDO OD MY Fe Fw ew O ON UI O MDM MDM MD N YW PY WW PO LW TO WO WOr O O e mom rn x e UY U9 U9 AN A e U HM UT U WO UI UO O U1 OY AI O71 O OA OT U U O NS eE O WW OO LO OO O Uw oO oO NON NRYNYNYO ee oe 52 0004 0001 Rev D Omni Page 12 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Meter Run Data To view the meter run data on the flow computer LCD display press Meter n Display on the OMNI front panel keypad where n equals the meter run number 1 to 4 you want to display when in the Display Mode The following data will display METER 1 Q SONIC Performance 100 00 VOSm s 3520137 Gas Vel 2 135 Flow m3 hr 1 625 Systematic swirl 1 Perform 100 00 2 Perform 100 00 3 Perform 100 0 la Ratio 25 1b Ratio 2a Ratio 2b Ratio 3a Ratio 3b Ratio 52 0004 0001 Rev D U Omni Page 13 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters DOCUMENT REVISION HISTORY DOCUMENT INITIAL RELEASE DATE ccsccccecesseeeeeeeeneeeeenenseees 02 June 2003 REVISION DATE PURPOSE CHANGE REQUEST A 02 June 2003 Maintained on the Web Initial release B
6. 3014 13027 13040 Flow Direction 0 Fwd 3155 3255 3355 3455 1 Rev Table 9 Flow Computer Configuration Data Meter Run Setup Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 Tube diameter 7145 7245 7345 7445 Minimum AGC ratio 1 10 17514 17614 17714 17814 Tube coefficient 7146 7246 7346 7446 Minimum sample ratio 17515 17615 17715 17815 Tube reference 7147 7247 7347 7447 Max VOS deviation 17516 17616 17716 17816 temperature Maximum flow deviation 17513 17613 17713 17813 17517 17617 17717 17817 Gas velocity low cutoff 52 0004 0001 Rev D Y Omni Page 11 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Flow Computer User Displays SV Module Serial Communications Port You can view live data received via RS 485 communications on the flow computer front panel LCD display only if a SV port is used to input the RS 485 interface from the Q Sonic flow meter To view this data press Setup n Display on the OMNI front panel keypad where n equals the SV port number 1 to 4 you want to display when in the Display Mode The following data will display SV PORT 1 Q Transaction V Status C R Status of Paths of Samples 1 Val Sample 2 Val Sample 3 Val Sample a b a b a b a b a b a b 1 1 2 2 3 3 1
7. 91 17691 17791 17891 Path 5a AGC limit 17561 17661 17761 17861 Path 5a AGC limit 17592 17692 17792 17892 Path 5b AGC limit 17562 17662 17762 17862 Path 5b AGC limit 17593 17693 17793 17893 Path 1 gas velocity 17563 17663 17763 17863 Path 1 gas velocity 17594 17694 17794 17894 Path 2 gas velocity 17564 17664 17764 17864 Path 2 gas velocity 17595 17695 17795 17895 Path 3 gas velocity 17565 17665 17765 17865 Path 3 gas velocity 17596 17696 17796 17896 Path 4 gas velocity 17566 17666 17766 17866 Path 4 gas velocity 17597 17697 17797 17897 Path 5 gas velocity 17567 17667 17767 17867 Path 5 gas velocity 17598 17698 17798 17898 Notes AGC Automatic Gain Control 52 0004 0001 Rev D Y Omni Page 10 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Table 8 Flow Computer Configuration Data Miscellaneous Meter Run Configuration Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 3108 3208 3308 3408 Primary Measurement 3157 3257 3357 3457 Flow meter device type Source 0 Serial 1 Pulses SV module port 3153 3253 3353 3453 Flow pulse freq I O point 13001 1
8. Flow Delta Rate amp Temp Comp Area Alarm Y Calculate Actual A A Flow Based on Pulse Input Signal v End Figure 1 Flow Computer Logic Flow Diagram for the Q Sonic Ultrasonic Gas Flow Meter 52 0004 0001 Rev D Y Omni Page 4 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Wiring Installation NOTES Serial Data Communications The serial interface between these devices is 2 wire RS485 mode utilizing a proprietary protocol at a fixed baudrate of 4800 All versions of the meters must be set for 4800 baud to communicate properly with the flow computer Setting Up and Wiring to OMNI Combo Modules In order to communicate with Q Sonic ultrasonic flow meters the OMNI flow computer must be equipped with at least one 1 SV combo module Model 68 6203 For instructions on jumper settings and other process I O combination module setup information refer to Volume 1 Chapter 2 of the OMNI User Manual The typical wiring required for connecting a Q Sonic flow meter to the OMNI Flow Computer Figure 2 A 2 wire RS 485 interface can be wired to either port terminals 1 and 2 for port 1 or 3 and 4 for port 2 of the flow computer terminal block that corresponds to the SV combo module You can install up to two 2 SV modules in the OMNI Flow Computer which will give you four 4 available SV RS 485 ports Although not required it is recommen
9. Last Updated 04 April 2012 TB 990101D Technical Bulletin Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters OMNI FLOW COMPUTERS INC ps 1 e 12620 West Airport Boulevard Suite 100 US Omni Sugar Land Texas 77478 United States of America Phone 281 240 6161 Fax 281 240 6162 www omniflow com 52 0004 0001 Rev D TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters NOTE User Manual Reference This Technical Bulletin complements the information contained in the User Manual Volume 3 Revision 23 27 Configuration and Advanced Operation Table of Contents E100 8 SNe eee RES rE EE eee re eet A eee ee ery 3 PDSWAGE me n eatoni Tinara EA ATE E E na main EEE a a a TE 3 Q Sonic Flow Meter Theory of Operation cccccccccsescsesesssesssssseresesesssessseseseeesesstenstsenenseess 3 OMNI Flow Computer OG ic yac lt cigoc Aes anuas vt casuedsde tte sags ctecank daqek cia sadthauas vacesaceagudstsdatansecta cevseieaatag 3 Wiring nstallati m i es Setectc cee a a acute a O dade E ERES 5 Flow Meter GonfiguratiOn sree epen ipanaa aae a e Eea eeu eaa ESANA ANERER E AEEA 6 Flow Computer Configuration xcalcchctiteerety vant eco dteoeducrardet enti aeh rosa ioecemne adtecadenee 6 Miscellaneous Configuration Meter Run Settings cccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenaeeeeeees 6 Meter Run Setup Entries ssicitoniscieeneseteasasctetetasletiieticod tated Sedaeeg halen iene es 7 Flow Comput
10. ded that the flow meter frequency pulse signals also be wired to the flow computer s input channel 3 forward direction and input channel 4 reverse direction of an A combo module Input channel 3 corresponds to terminals 5 and 6 and input channel 4 to terminals 7 and 8 of the back panel terminal block respective to the combo module The actual terminal block numbers depend upon which backplane connector or slot the module is plugged The E combo module can also be used in this configuration with slight variations in wiring connections Volume Chapter 2 12 OMNI Back Panel Q Sonic Ultrasonic A Combo Module Gas Flowmeter Terminal Block 24 Volts Figure 2 Example of Wiring Q Sonic Flowmeter to OMNI Flow Computer s RS 485 Port 1 of an SV Module D Omni Page 5 of 14 52 0004 0001 Rev D w TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Flow Meter Configuration The OMNI Flow Computer supports the data types for the specified Q Sonic flow meters Table 1 Table 1 Data Types for Q Sonic Flow Meters eee J Neme escrpion o O Standard Q Sonic style data message used by Q_DATA e Q Sonic 3 5 Q Meter Stand alone SPU e Q Sonic 3 5 QL Meter SPU RU II II Extended Q Sonic style data message Reserved for use in SupervisorMode a dedicated mode of operation by G XDATA e Q Sonic 3 5 Q Meter Stand alone SPU e Q Sonic 3 5 QL Meter SPU RU IIII AGA
11. er Database Addresses and Index NUMDESS ccccccecesssecceeeeeeeeeseessstsnaeees 8 Flow Computer User Displays ucs 255 6 conic ajeec sy aeccncechcseet teyenat dl cnhmecdceadtacatte oevageabidea camel daghae 12 SV Module Serial Communications Port cccccccceeesecceeeeeeeceeeeeenaeeeeseseaeeeseeeneneeteeneaaaees 12 Meter R n DAT sisson ses tiie ere Seea eae KBs edd cee sidecases a eS 13 Figures Figure 1 Flow Computer Logic Flow Diagram for the Q Sonic Ultrasonic Gas Flow Meter 4 Figure 2 Example of Wiring Q Sonic Flowmeter to OMNI Flow Computer s RS 485 Port 1 of BUOY MOGUIC EEE E ache E E E cement cloed ud lad ety sdeesuniaaleab tase tues caleas 5 52 0004 0001 Rev D w A Omni Page 2 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Scope This Technical Bulletin applies to firmware revisions 23 74 and 27 74 of OMNI 6000 OMNI 3000 Flow Computers for gas flow metering systems Abstract The Q Sonic ultrasonic flow meter determines the linear gas velocity through the meter tube by using multiple acoustic pulse reflection paths The Q Sonic analyzes these paths employing the Absolute Digital Time Travel ADTT measurement method The OMNI Flow Computer totalizes either the flow meter pulse input signal or the profile corrected gas velocity data received from the Q Sonic to calculate the actual flow rate of gas The OMNI compensates temperature expansion e
12. er downstream with the flow than upstream against the flow The gas flow velocity is determined from this upstream downstream travel time differential of the ultrasonic pulses within the multiple reflection paths When there is no gas flow in the pipeline the upstream and downstream travel times are the same i e the time differential is zero 0 The Q Sonic flow meter employs three 3 or five 5 transducer pairs with a minimum of one axial path and two swirl paths This configuration allows for unique combinations of reflection paths to best take into account the different effects of gas flow profile variations including swirl in the pipeline The gas velocity can be determined for bi directional forward or reverse fluid flow OMNI Flow Computer Logic The OMNI Flow Computer can determine the actual flow rate from data either received serially from the Q Sonic flow meter or from a live pulse frequency signal input if one has been connected and assigned Totalization will be based on the flow pulse frequency input when the flow transmitted by the Q Sonic is in the correct direction forward reverse and the pulse frequency is within limits This live signal will also be used in the event of a communications failure between the Q Sonic and the OMNI However in order for the OMNI to use the pulse frequency signal it must be wired to the Q Sonic and an I O point assigned in the flow computer configuration The flow computer will te
13. ffects on the flow meter tube by equaling the flow to the profile corrected gas velocity multiplied by the temperature compensated tube area If required it can also directly use the non compensated flow rate value transmitted by the ultrasonic meter as the actual flow rate NOTE 1 Communicating With Instromet Q Sonic Ultrasonic Flow Meters The Instromet Q Sonic ultrasonic flow meter measures gas flow with acoustic pulse reflection paths by using the Absolute Digital Time Travel ADTT method This device communicates with OMNI Flow Computers via OMNI s SV process I O combo module using a proprietary protocol with a fixed baudrate of 4800 To use the scaled pulse output of the Instromet flow meter the flow computer must either have one 1 A B or E combo module installed Q Sonic Flow Meter Theory of Operation Instromet s ultrasonic gas flow metering technology incorporates multiple pairs of transducers into a smart digital inferential instrumentation device The device is installed into a gas pipeline system to measure gas flow Each pair of transducers emits ultrasonic acoustic pulses that travel bi directionally in either a single axial or diagonal or double swirl reflection path to and from each transducer in the pair The flow meters apply the Absolute Digital Time Travel ADTT method of ultrasonic pulse analysis which is based on the fact that pulses travel between a transducer pair fast
14. h 2b AGC level 17577 17677 17777 17877 Path 3a AGC level 17547 17647 17747 17847 Path 3a AGC level 17578 17678 17778 17878 Path 3b AGC level 17548 17648 17748 17848 Path 3b AGC level 17579 17679 17779 17879 Path 4a AGC level 17549 17649 17749 17849 Path 4a AGC level 17580 17680 17780 17880 Path 4b AGC level 17550 17650 17750 17850 Path 4b AGC level 17581 17681 17781 17881 Path 5a AGC level 17551 17651 17751 17851 Path 5a AGC level 17582 17682 17782 17882 Path 5b AGC level 17552 17652 17752 17852 Path 5b AGC level 17583 17683 17783 17883 Path 1a AGC limit 17553 17653 17753 17853 Path 1a AGC limit 17584 17684 17784 17884 Path 1b AGC limit 17554 17654 17754 17854 Path 1b AGC limit 17585 17685 17785 17885 Path 2a AGC limit 17555 17655 17755 17855 Path 2a AGC limit 17586 17686 17786 17886 Path 2b AGC limit 17556 17656 17756 17856 Path 2b AGC limit 17587 17687 17787 17887 Path 3a AGC limit 17557 17657 17757 17857 Path 3a AGC limit 17588 17688 17788 17888 Path 3b AGC limit 17558 17658 17758 17858 Path 3b AGC limit 17589 17689 17789 17889 Path 4a AGC limit 17559 17659 17759 17859 Path 4a AGC limit 17590 17690 17790 17890 Path 4b AGC limit 17560 17660 17760 17860 Path 4b AGC limit 175
15. ial communications data will be used as a backup means of flow calculations by the flow computer NOTE This feature became available in the flow computer for the Instromet UFM in 23 74 20 and 27 74 20 firmware o Assign Flow Pulse Frequency I O Point Flow meter pulse signals can only be assigned to Input Channels 3 and 4 of A and E combo modules and input channel 3 of a B combo module Enter the input channel number which will be used to input the ultrasonic flow meter pulse signal NOTE An E Combo module is required for Pulse Fidelity checking Assign the flow computer input channel number that corresponds to the 3rd input channel on the Combo module where the A pulse train from the flow meter will be wired to The flow computer will automatically assume the B pulse train will be wired to the next input channel Meter Run Setup Entries The following meter run setup entries are available for the Q Sonic ultrasonic gas flow meter Tube Diameter Enter the diameter of the ultrasonic flow meter tube in inches firmware 23 or millimeters firmware 27 This diameter is subsequently corrected for expansion due to temperature and used together with the corrected gas velocity through the meter to calculate flow rate Tube Reference Temperature Enter the temperature as degrees Fahrenheit firmware 23 or degrees Celsius firmware 27 at which the ultrasonic meter tube was measured Table 2 Tube Expansion Coefficient The
16. mperature compensate the meter tube area and calculate flow rate based on the profile corrected velocity of the gas transmitted serially by the flow meter Figure 1 If the calculated flow rate is not within reasonable limits the OMNI will directly use the transmitted flow rate as the actual flow rate 52 0004 0001 Rev D Y Omni Page 3 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Start d d N Q Sonic N lt Communications gt No N OK A N Po si Yes Set Q Sonic cear Sonic Communicati Communication Failed Alarm Failed Alarm No Is Transmitted Flow Rate in gt the Correct N Direction N Aes y x La in No y N A N P pre Pulse YO _ Bre Pulse vo Ne Set Pulse Signal lt lt __ Assigned gt lt Assigned Suspect 7 X Ed Alarm ae A A Ne Yes Yes pa vis Pulse and Q Sonic N Set Pulse Signal S Flow Rate 7 Suspect N within Limits Alarm Y amp k y a Yes fi N sthe No _ Flow Based on y _ Gas Velocity Clear Pulse Signal within limits Suspect Alarm x Ly 4 G a Yes v y v Disable A N Totalizing Pulse No Set Flow Delta Alarm Clear Flow Delta lt AS SHEET e Alarm X y y N z y y Set Run as Yes Calculate Actual Flow Calculate Actual Flow Inactive Based on Based on Gas Velocit Vv Transmitted Flow BECAME OCU Clear
17. n 23 or meters per second Revision 27 below which you do not want to totalize Consult with Instromet to determine this value Flow Computer Database Addresses and Index Numbers Tables 3 thru 9 list the Modbus database addresses within the OMNI have been assigned to the Q Sonic ultrasonic metering feature These tables are categorized per data type Table 3 Meter Run Alarm Status Points Real Time Date Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 Loss of Communication 2154 2254 2354 2454 Path 1 sample error alarm 2167 2267 2367 2467 Loss of pulse impulse 2155 2255 2355 2455 Path 2 sample error alarm 2168 2268 2368 2468 Flow rate delta alarm 2156 2256 2356 2456 Path3 sample error alarm 2169 2269 2369 2469 Path 1a AGC ratio alarm 2157 2257 2357 2457 Path 4 sample error alarm 2170 2270 2370 2470 Path 1b AGC ratio alarm 2158 2258 2358 2458 Path5 sample error alarm 2171 2271 2371 2471 Path 2a AGC ratio alarm 2159 2259 2359 2459 Overall sample error alarm 2172 2272 2372 2472 Path 2b AGC ratio alarm 2160 2260 2360 2460 Path 1 gas VOS alarm 2173 2273 2373 2473 Path 3a AGC ratio alarm 2161 2261 2361 2461 Path 2 gas VOS alarm 2174 2274 2374 2474 Path 3b AGC ratio alarm 2162 2262 2362 2462 Path 3 gas VOS alarm 2175 2275 2375 2475 Path 4a AGC
18. ow Computer can accept two 2 SV combo modules With one 1 SV module you have two 2 SV ports available and with two 2 SV modules four 4 ports are available For each ultrasonic meter run enter the SV port number 1 to 4 to which the RS 485 serial interface input from the Q Sonic flow meter is wired to the flow computer e Dual Pulse Y N Enter Y for each meter run that will be providing dual pulse trains for Pulse Fidelity checking e NOTE This feature became available in the flow computer for the Instromet UFM in 23 74 20 and 27 74 20 firmware e Select Flow Direction Q Sonic flow meters allow for bi directional fluid flow measurement You can setup the flow computer to totalize either forward or reverse flow on any meter run with an ultrasonic flow meter 52 0004 0001 Rev D Y Omni Page 6 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Primary Flow This setting instructs the flow computer to use either the pulse input channel or the SV serial communications data as the primary means of calculating flow Options are o 0 Select Serial Data as primary flow This means the SV serial communications data will be the primary and the pulse input channel if assigned will be used as a backup means of flow calculations by the flow computer o 1 Select Pulse Input as primary flow This means the flow pulses received from the flow meter will be the primary and the SV ser
19. ratio alarm 2163 2263 2363 2463 Path 4 gas VOS alarm 2176 2276 2376 2476 Path 4b AGC ratio alarm 2164 2264 2364 2464 Path 5 gas VOS alarm 2177 2277 2377 2477 Path 5a AGC ratio alarm 2165 2265 2365 2465 Notes AGC Automatic Gain Control Path 5b AGC ratio alarm 2166 2266 2366 2466 VOS Velocity of Sound 52 0004 0001 Rev D Y Omni Page 8 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters Table 4 16 Bit Integer Registers Real Time Data Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 Flow Dir O fwd 1 rev 3155 3255 3355 3455 Path 1a AGC level 3180 3280 3380 3480 Path 1 performance 3158 3258 3358 3458 Path 1b AGC level 3181 3281 3381 3481 Path 2 performance 3159 3259 3359 3459 Path 2a AGC level 3182 3282 3382 3482 Path 3 performance 3160 3260 3360 3460 Path 2b AGC level 3183 3283 3383 3483 Path 4 performance 3161 3261 3361 3461 Path 3a AGC level 3184 3284 3384 3484 Path 5 performance 3162 3262 3362 3462 Path 3b AGC level 3185 3285 3385 3485 Path 1a AGC ratio 3163 3263 3363 3463 Path 4a AGC level 3186 3286 3386
20. the AGC ratio for each ultrasonic path in both path directions An alarm will occur if the AGC ration of any path drops below this ratio Nominal entries are 1 5 to 2 52 0004 0001 Rev D Y Omni Page 7 of 14 TB 990101D Communicating with Instromet Q Sonic Ultrasonic Gas Flowmeters o Minimum Percent Sample Ratio This entry checks the ratio of good received data pulses verses total transmitted pulses for each ultrasonic path in both directions A ratio below this setting will cause an alarm Nominal entries are 50 to 70 NOTE Difference Between Gas Velocity and Velocity of Sound The gas velocity through the meter tube is directly proportional to the actual flow rate of the gas in the pipeline The velocity of sound VOS refers to the amount of time it takes a transmitted acoustic pulse to travel through the gas ultrasonic paths The VOS will vary depending upon gas quality and flowing conditions o Velocity of Sound VOS in Gas Deviation Percent In some configurations the flow computer can verify that the average VOS calculated for all paths agrees with the VOS of each individual path This entry is the maximum percent that any one path VOS varies from the average VOS of all the paths o Gas Velocity Low Cutoff Some gas movement can occur even when an ultrasonic meter is blocked in This is caused by convection currents within the meter tube Enter a minimum gas velocity in feet per second Revisio
21. ultrasonic meter tube will expand and contract with temperature The flow computer requires the linear coefficient of thermal expansion for the meter tube material in order to correct the meter tube area Table 2 Tube Reference Temperature US Customary Units Metric Units Mild Carbon Steel Plate 100 to 300 F 6 20 x e 73 3 to 148 9 C 1 12 x e 304 316 Stainless Steel 100 to 300 F 9 25 x e 73 3 to 148 9 C 1 67 x e Q Sonic Maximum Flow Rate Deviation Percent The actual user entered flow used by the flow computer to totalize depends upon the following factors o Ifa pulse signal is available and set as primary source the flow computer will use it for calculations as long as the calculated flow rate is within this flow rate deviation percentage of the flow transmitted serially by the Q Sonic o Ifa pulse signal is not set as primary source or has failed the flow computer will use the corrected linear gas velocity transmitted by the Q Sonic and calculate flow based on the temperature compensated area of the meter tube The flow rate calculated by this method must also be within this flow rate deviation percentage of the flow transmitted serially by the Q Sonic Summarizing the flow computer first tries to use the pulse signal then the transmitted gas velocity value and finally the transmitted flow rate o Minimum Automatic Gain Control AGC Ratio The flow computer calculates
22. wo 2 implied decimal places Table 5 32 bit IEEE Floating Points Real Time Data Database Address Database Address Description for Meter Run Number Description for Meter Run Number 1 2 3 4 1 2 3 4 Max flow deviation 17513 17613 17713 17813 Path 1 velocity of sound 17527 17627 17727 17827 Min AGC ration 1 to 10 17514 17614 17714 17814 Path 2 velocity of sound 17527 17627 17727 17827 Min sample ratio 17515 17615 17715 17815 Path 3 velocity of sound 17527 17627 17727 17827 Max VOS deviation 17516 17616 17716 17816 Path 4 velocity of sound 17530 17630 17730 17830 Gas velocity low cutoff 17517 17617 17717 17817 Path 5 velocity of sound 17531 17631 17731 17831 Avg path performance 17520 17620 17720 17820 Path 1 gas velocity 17532 17632 17732 17832 Velocity of sound VOS 17521 17621 17721 17821 Path 2 gas velocity 17533 17633 17733 17833 Gas velocity 17522 17622 17722 17822 Path 3 gas velocity 17534 17634 17734 17834 Pressure 17523 17623 17723 17823 Path 4 gas velocity 17535 17635 17735 17835 Temperature 17524 17624 17724 17824 Path 5 gas velocity 17536 17636 17736 17836 Gas flow rate 17525 17625 17725 17825 EE Pr N Net flow rate 17526 17626 17726 17826 VOS Velocity of Sound 52 0004 0001 Rev D Y Omni
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