2i Calibration Procedure for Service Providers Contents
Contents
1. ID tube may be used in place of the umbilical This tube and adapter fitting are provided with every 2i ensemble 12 Ensure that the flow meter is set to volumetric mode and the standard temperature is set to 20 C Note The use of mass flow will create an offset in the calibration if used and result in incorrect flow values 13 Select DOWN STREAM on the 2i base unit to sample through the downstream port 14 Allow the system to stabilize for 10 seconds 15 Check that the displayed flow on the 2i base unit is approximately 28 3 ALPM 16 Turn off the pump control using the PU C 0 command 17 Wait 10 seconds 18 Read the current pressure offset value using the PO R command 19 The flow values displayed by the 2i and calibrated flow meter should be within 596 of each other If the difference between the readings is greater than 5 flow meter calibration is necessary Incrementally change the pressure offset value using the PO W command until the display on the 2i and the calibrated flow meter match within 5 The 7 sign here represents the newly selected pressure offset value Offset values can only be integers and cannot be negative 20 Take a measurement from the flow meter and the 2i display Enter the new values in the appropriate columns under AS LEFT 21 Turn the pump control back on using PU C 1 22 Wait 10 seconds 23 Verify that the calibrated flow meter and 2i display show the same flow rate2. Division of Hamilton Associates Inc o te om 10 11 12 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Connect the output of the generator to the downstream port of the 2i base unit Start the generator and press the downstream button Read the DAC value using the LD P R command Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage on the 2i screen reads between 1 960 and 2 040V Do this using the LD P W command Note 7 symbol represents an integer between 0 and 1023 If the voltage cannot be held between 1 960 and 2 040V using the DAC integers the LC command must be used to fine tune the calibration continue to step 9 Otherwise continue to step 10 Check that the Leakage voltage is between 1 920 and 2 080V If the voltage is outside of these bounds the LSC must be rebuilt or replaced If the voltage is inside these bounds use the LV 10 command to get the average reading over ten measurements Enter this number using the LC P 100 where is the number obtained from the LV 10 command Type IF 100 Wait 20 seconds Read the Leakage value and enter it into the 2i OUTPUT column and AS LEFT row of the calibration certificate LSC Alignment amp Leak Test 1 Using the VC command place the unit in CLEAR sample mode 2 Using the LV 10 command verify that the LSC voltage i
3. e i E E E E EE HN 7 C libtatins HIGH MO E E ARAE EEE E EET ET E ner 7 Calibrating DOP iat ee gnc a eats isa a i lead ebe i e teased aiea iaeei 8 Calibrating User Defined Reagent sseseessesreeseesessreeresresstsererresstssrsstensttstestissetstesenstesetteestesesetesresseser 9 WW LADY T o AET A E E E E E E T 10 Doc Owner Senior Mechanical Engineer ATI Page 1 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL Lg Re A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax410 363 9695 http www atitest com Purpose The purpose of this document is to guide technical personnel through a typical annual calibration for the 2i photometer Equipment The following equipment will be required 1 A PC with a terminal program Realterm recommended and two functional USB ports Realterm is freeware designed for use on the Windows operating system Software download and documentation is available on the internet at the following address http sourceforge net projects realterm source directory Certificate of Calibration USB Security Dongle ATI PN 9300254 USB cable Type A male to Type B male Calibrated Bios 220 Flow meter or equivalent Calibrated Thermometer Calibrated Barometer 2i scanning probe umbilical cable ATI PN 0800217 9 Fully functional 2i scanning probe ATI PN 0200469 10 PAO DOP calibrated aerosol generator 11 Calibrated referenc
4. flow offset obtained in step 7 Enter the value determined in step 8 into the instrument using the FO W command The symbol represents the new value Check that the flow shown on the screen is within 0 5 ALPM of flow noted in step 3 If not repeat steps 3 through 9 Turn pump control back on with command PU C 1 Alternate pressing the downstream clear and upstream buttons to ensure there is no pump surge during valve change Note The flow value may have a slightly higher than normal reading in the first few seconds after a valve change Allow the flow reading to stabilize before taking measurement Calibrating PAO 1 Make sure the instrument is in calibration mode and the terminal program is communicating with the base unit Note All commands used in this calibration are further explained in the table beginning on page 27 of document 1800228 Set the reagent to PAO on the base unit using the RF 0 command Set the internal reference to 2 0V using the IF 100 command Set the output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Doc Owner Senior Mechanical Engineer ATI Page 6 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A
5. 5 Setting the Flow Offset Using a flow offset compensates for the sample valve manifold flow resistance and keeps the pump from surging when the valve state is changed from upstream to clear or downstream to clear 1 Connect the 12 foot scanning probe umbilical and scanning probe to downstream adapter Note The 12 foot 4 ID tube may be used here also Doc Owner Senior Mechanical Engineer ATI Page 5 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 10 11 12 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Allow flow to stabilize to approximately 28 3 ALPM for 10 seconds with the downstream port selected Turn off the pump control with the PU C 0 command Take note of the flow value shown on the 2i base screen Press clear button Let the flow stabilize for 10 seconds with the clear valve selected Note the new flow value on the 2i base screen If the displayed flow value is greater than the flow value displayed in step 3 the reference filter needs to be replaced Take the difference between the 2i flow value in downstream Step 3 and the 2i flow value in clear Step 5 This number will be used in setting the flow offset Use the FO R command to read the flow offset stored in memory Determine the difference between the values obtained in steps 6 amp 7 Add this value to the
6. RF 4 on page 8 C Rearranged steps during DOP PAO and HIGH 3 May 2013 calibration to make collecting AS FOUND information more efficient D Added reference photometer to the calibration 13 May 2013 equipment list Changed on board photometer to reference photometer E Corrected sequence for obtaining AS FOUND result 3 July 2013 for HIGH reagent selection F Corrected Flow Meter Check and Calibration amp Setting 30 January 2014 Flow Offset procedures G Added battery replacement to Wrap Up section as 28 April 2014 part of annual service H Added LSC Alignment amp Leak Test section to 25 July 2014 procedure Re ordered reagent calibration sequence J Added Ondina amp Finevestan to reagent calibration 9 December 2014 Doc Owner Senior Mechanical Engineer ATI Page 13 of 14 1800229 Rev J 9 December 2014 BITT AIR TECHNIQUES INTERNATIONAL m A A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Doc Owner Senior Mechanical Engineer ATI Page 14 of 14 1800229 Rev J 9 December 2014
7. RF 9 command Set the internal reference to 0 33V using the IF 100 command 4 Setthe output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Connect the output of the generator to the downstream port of the 2i base unit Start the generator and press the downstream button Read the DAC value using the LD H R command Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage ood reads 0 33 V 0 03V using the LD H W command Note symbol represents an integer between 0 and 1023 If the voltage cannot be held between 0 030 and 0 036V using the DAC integers the LC command must be used to fine tune the calibration continue to step 9 Otherwise continue to step 10 9 Ifthe voltage is inside these bounds use the LV 10 command to get the average reading over ten measurements Enter this number using the LC H 100 where is the number obtained from the LV 10 command 10 Type IF 100 11 Wait 20 seconds 12 Read the Leakage value and enter it into the 2i OUTPUT column and AS LEFT row of the calibration certificate Calibrating DOP 1 Make sure the instrument is in calibration mode and the terminal program is communicat
8. amilton Associates Inc 10 Wrap up O OY d o Ie 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com the LV 10 command to get the average reading over ten measurements Enter this number using the LC F 100 where is the number obtained from the LV 10 command Type IF 100 Remove the existing lithium battery and install a new one PN 6000140 CR2032 located on rear PCBA Set the date using DW YEAR MONTH DAY HOUR MINUTE SECOND command Set the calibration to reset to 365 days using RC command Set the reagent back to PAO RF 0 Reset machine and record AS LEFT stray light value in the calibration certificate Verify the Leakage value and sample flow displayed is the same in both Upstream amp Downstream sample modes Sign the calibration certificate Fill in and apply calibration sticker to back of base unit Attach tamper evident sticker to one screw on the top cover Doc Owner Senior Mechanical Engineer ATI Page 12 of 14 1800229 Rev J 9 December 2014 TES AIR TECHNIQUES INTERNATIONAL A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com REVISIONHISTORY Revision Description Date A Initial Release 7 Aug 2012 B Changed User Reagent to reagent 4 Changed RF 10 1 Feb 2013 command to
9. ation continue to step 9 Otherwise continue to step 10 Check that the Leakage voltage is between 1 920 and 2 080V If the voltage is outside of these bounds the LSC must be rebuilt or replaced If the voltage is inside these bounds use the LV 10 command to get the average reading over ten measurements Enter this number using the LC D 100 where is the number obtained from the LV 10 command Type IF 100 Wait 20 seconds Read the Leakage value and enter it into the 2i OUTPUT column and AS LEFT row of the calibration certificate Calibrating User Defined Reagent The user defined reagent may be used when a customer requires a reagent not listed in the 2i software This reagent does not have to be calibrated for the unit to operate it is only required when a specific reagent is requested The ATI calibration certificate does not have a section for the USER reagent 5 Make sure the instrument is in calibration mode and the terminal program is communicating with the base unit Note All commands used in this calibration are further explained in the table on page 27 of document 1800228 Set the reagent to USER on the base unit This can be done with the RF 4 command Set the internal reference to 2 0V using the IF 100 command Set the output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage
10. e photometer Ee ME OR SOS E Documentation The latest revision of the following documentation is used for reference during the annual calibration 1 1800228 2i Service Manual Procedurei Mechanical Integrity 1 Check that top and bottom panels are secured tightly Doc Owner Senior Mechanical Engineer ATI Page 2 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Recording As Found Conditions Recording Initial Stray Light 1 2 3 Turn on the base unit and wait for initialization to complete Note the stray light value that is displayed on the screen as the zero is established Record this value on calibration certificate in the stray light section under AS FOUND Recording Ambient Conditions 1 Read the ambient temperature and barometric pressure using calibrated gauges Record the measurements under the Environmental Conditions section of the Certificate of Calibration Recording Flow 1 2 3 Connect a calibrated flow meter to the downstream sample port using 12 feet of 77 ID tubing Select DOWN STREAM on the 2i base unit to sample through the downstream port Read the displayed flow on the calibrated flow meter and enter the value into the AS FOUND row in the MEASUREMENT column of the Volumetric Flow sectio
11. ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com 2i Calibration Procedure for Service Providers Contents PUNE OS oH Q 2 Bdupment a a R a E E E E E dee mere eee reenter 2 Documentatlo Nsei m 2 PHO GRITS PR 2 Me hanical Inte PEIDY uoo dosi coorta eutacaeaseceesbaveadacs eus tite p Ux Eu ent Ducis astu Gabun EERE SEEE EK aaie 2 Recorduige As Pound Conditions cuiii renari ecko e ioo ul sU MM nnn tea ba ete 3 Recording Initial Stray LiQht ccccccessssscececececeesesseaeeeceeeseseeeseseseeeessseseseeeeeeeecseseuseseseeeeseesesaeseeeeeeseneseseaaees 3 Recording Ambient Conditions oco etre reges Fo irte rb Fade Loci bae pa Ong eis d pA RON se deu Duas CU ku IDEM T M MEE 3 Recordine Flows estoit n E A N ET 3 Recording Aerosol Measurements ccecsssccecececesesseaecececeesseesesaeaeeeeesssesesaaaeeeceeeseeesaeaeseeeeeeussesasaeaeeeseesseseaaees 3 Comim ni ations Set p susisiek ia as a a ra M qu 4 Entering Calibration Mode sioria iaa ETa ET E aia 4 Plow Met t Check and L aliBESELBDE usu diii Iii diee risna ia celui oc ates 4 Setting the Flow Offset P 5 Calibrating PAO nce ca cela ceca arerioari EEE isa a EE 6 LSC Alignment amp Leak Lo
12. further explained in the table on page 27 of document 1800228 Set the reagent to USER on the base unit This can be done with the RF 11 command Set the internal reference to 2 0V using the IF 100 command Set the output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Connect the output of the generator to the downstream port of the 2i base unit Start the generator and press the downstream button Read the DAC value using the LD F R command Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage on the 2i screen reads between 1 960 and 2 040V Do this using the LD F W command Note symbol represents an integer between 0 and 1023 If the voltage cannot be held between 1 960 and 2 040V using the DAC integers the LC command must be used to fine tune the calibration continue to step 9 Otherwise continue to step 10 Check that the Leakage voltage is between 1 920 and 2 080V If the voltage is outside of these bounds the LSC must be rebuilt or replaced If the voltage is inside these bounds use Doc Owner Senior Mechanical Engineer ATI Page 11 of 14 1800229 Rev J 9 December 2014 BITIT AIR TECHNIQUES INTERNATIONAL LG A A Division of H
13. ing with the base unit Note All commands used in this calibration are further explained in the table on page 27 of document 1800228 2 Set the reagent to DOP on the base unit This can be done with the RF 1 command Set the internal reference to 2 0V using the IF 100 command Set the output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the Doc Owner Senior Mechanical Engineer ATI Page 8 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc ONO A 10 11 12 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Connect the output of the generator to the downstream port of the 2i base unit Start the generator and press the downstream button Read the DAC value using the LD D R command Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage on the 2i screen reads between 1 960 and 2 040V Do this using the LD D W command Note 7 symbol represents an integer between 0 and 1023 If the voltage cannot be held between 1 960 and 2 040V using the DAC integers the LC command must be used to fine tune the calibr
14. it into the 2i OUTPUT column and AS LEFT row of the calibration certificate Calibrating Ondina Reagent The Ondina reagent may be used in territories where Ondina is a common oil used for filter certification This reagent does not have to be calibrated for the unit to operate it is only required when a specific reagent is requested The ATI calibration certificate does not have a section for the Ondina reagent o NO T Make sure the instrument is in calibration mode and the terminal program is communicating with the base unit Note All commands used in this calibration are further explained in the table on page 27 of document 1800228 Set the reagent to Ondina on the base unit This can be done with the RF 10 command Set the internal reference to 2 0V using the IF 100 command Set the output concentration of the calibrated aerosol generator to 100 ug L using the reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Connect the output of the generator to the downstream port of the 2i base unit Start the generator and press the downstream button Read the DAC value using the LD O R command Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage on the 2i screen reads between 1 960 and 2 040V Do this using
15. l 410 363 9696 Fax 410 363 9695 http www atitest com Connect the calibrated aerosol generator to the upstream sample port of the 2i base unit Change the 2i reagent setting to HIGH Select Set 100 to Upstream Concentration from the Home menu Record the displayed value in the AS FOUND row in the 2i OUTPUT column Communications Setup ls 2 Insert the security dongle into USB port of PC Connect the USB cable from the 2i to the PC Entering Calibration Mode 1 2 3 4 Start the Calibration executable file 2iCalMode exe Note the serial comm port number shown on the screen Check that the main screen of the 2i base unit displays the calibration screen Start the terminal application from the PC and enter the setup information including the serial comm port number displayed in the previous step Refer to 1800228 pg 25 26 for more detail Flow Meter Check and Calibration The flow meter assembly should be checked and calibrated to ensure that the displayed value in the main sampling screen matches the actual flow at the end of the scanning probe jJ novo With the base unit running read the temperature of the internal flow meter through the thermistor using the T command Note When typing commands always use CAPITAL letters and use the SEND ASCII button to send commands to the 2i Check the temperature value returned against the ambient temperature recorded earlier Ensure the temperatures are
16. n Read the flow from the 2i LCD display and enter the value into the AS FOUND row in the 2i OUTPUT column of the Volumetric Flow section Recording Aerosol Measurements 1 Ox Qi Se IM Set the output concentration of the calibrated aerosol generator to 100 ug L of DOP using the calibrated reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the AS FOUND row in the GENERATOR column in the DOP section Connect the output of the aerosol cart to the downstream sample port of the 2i base unit Make sure the reagent setting of the 2i is set to DOP and the internal reference is set to 100 ug L Select DOWN STREAM on the 2i base unit to sample through the downstream port Record the displayed value in the AS FOUND row in the 2i OUTPUT column Repeat these steps for PAO Set the output concentration of the calibrated aerosol generator to 100 ug L of PAO using the calibrated reference photometer Read the calibrated aerosol generator concentration displayed as Leakage on the reference photometer Record this value in the AS FOUND row in the GENERATOR column in the High Concentration section Doc Owner Senior Mechanical Engineer ATI Page 3 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 10 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Te
17. on the reference photometer Record this value in the GENERATOR column and AS LEFT row of the calibration certificate Connect the output of the generator to the downstream port of the 2i base unit Doc Owner Senior Mechanical Engineer ATI Page 9 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Start the generator and press the downstream button Read the DAC value using the LD U R command 8 Adjust the DAC value higher or lower than the value read in step 7 until the Leakage voltage 10 11 12 on the 2i screen reads between 1 960 and 2 040V Do this using the LD U W command Note 7 symbol represents an integer between 0 and 1023 If the voltage cannot be held between 1 960 and 2 040V using the DAC integers the LC command must be used to fine tune the calibration continue to step 9 Otherwise continue to step 10 Check that the Leakage voltage is between 1 920 and 2 080V If the voltage is outside of these bounds the LSC must be rebuilt or replaced If the voltage is inside these bounds use the LV 10 command to get the average reading over ten measurements Enter this number using the LC U 100 where is the number obtained from the LV 10 command Type IF 100 Wait 20 seconds Read the Leakage value and enter
18. s between 0 000050 and 0 000500 If the returned value falls between 0 000050 and 0 000500 continue to next step If the returned value is greater than 0 000500 adjust the LED position until the value falls between 0 000050 and 0 000500 and return to Calibrating PAO section 3 Reset the machine and set the reagent to PAO 4 Setthe displayed decimals to 4 places 5 Make sure the internal reference is set to 100 ug L 6 Press the CLEAR button re zero if necessary 7 While directing aerosol from the calibration source at ALL internal sample components and connections watch the penetration display and make sure it does not exceed 0 000396 If no values greater than 0 0003 are displayed proceed to the next section If ANY values greater than 0 0003 are displayed isolate and repair the leak and repeat beginning at Setting the Flow Offset Calibrating HIGH Doc Owner Senior Mechanical Engineer ATI Page 7 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL m A Division of Hamilton Associates Inc ER 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com 1 Make sure the instrument is in calibration mode and the terminal program is communicating with the base unit Note All commands used in this calibration are further explained in the table on page 27 of document 1800228 2 Setthe reagent to HIGH on the base unit This can be done with the
19. the LD O W command Doc Owner Senior Mechanical Engineer ATI Page 10 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com Note symbol represents an integer between 0 and 1023 If the voltage cannot be held between 1 960 and 2 040V using the DAC integers the LC command must be used to fine tune the calibration continue to step 9 Otherwise continue to step 10 Check that the Leakage voltage is between 1 920 and 2 080V If the voltage is outside of these bounds the LSC must be rebuilt or replaced If the voltage is inside these bounds use the LV 10 command to get the average reading over ten measurements Enter this number using the LC O 100 where is the number obtained from the LV 10 command 10 Type IF 100 Calibrating Finevestan Reagent The Finevestan reagent may be used in territories where Finevestan is a common oil used for filter certification This reagent does not have to be calibrated for the unit to operate it is only required when a specific reagent is requested The ATI calibration certificate does not have a section for the Finevestan reagent o NDMA Make sure the instrument is in calibration mode and the terminal program is communicating with the base unit Note _All commands used in this calibration are
20. within 5 C If the base unit s temperature reading is outside these limits the thermistor PN 0600526 must be replaced it can not be adjusted Turn off the pump control using the PU C 0 command This will prevent the pump from surging later in the calibration process Turn off the pump using the PU S 0 command Wait 10 seconds Read the system pressure at the flow meter using the P command Check this pressure reading against the ambient barometric pressure recorded earlier Ensure the pressures are within 14 kPa 2 psi If the base unit s pressure reading is outside these limits the main PCBA should be replaced or reworked it can not be adjusted Doc Owner Senior Mechanical Engineer ATI Page 4 of 14 1800229 Rev J 9 December 2014 ea A AIR TECHNIQUES INTERNATIONAL LG Re A Division of Hamilton Associates Inc iS 11403 Cronridge Drive Owings Mills MD 21117 2247 USA Tel 410 363 9696 Fax 410 363 9695 http www atitest com 8 Turn pump on using the PU S 1 command The pump should return to operation without surging Actions taken in Step 3 keep the pump stable when it is turned back on 9 Turn the pump control back on with the PU C 1 command 10 Connect the 12 ft umbilical cable between the 2i base unit downstream port and the probe 11 Remove the isokinetic nozzle if installed from the scanning probe and connect a calibrated external flow meter to the end of the probe sampling tube Note A12 foot long 74
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