HBLT Software Version 1.62
Contents
1. 2 ASCII code 63 decimal status query During most test states this command causes the tester to echo back a message formatted like XXX Y Y Y lt cr gt where XXX is the current pressure reading in applicable test units and Y YY the peak pressure reading again in test units Example 20 200 lt cr gt and 1130 1200 lt cr gt This command is ignored when in streaming mode See description of command character D below for details on streaming C ASCII code 67 decimal Streaming mode CANCEL This is a software function that has no on screen button equivalent See description of command character D below for details on streaming D ASCII code 68 decimal Streaming mode ENABLE This is a software function that has no on screen button equivalent Streaming mode causes a continuous flow of data HBLT User s Manual page 26 to be sent by the HBLT during test operation one data packet every 10 milliseconds See the description of the colon response code for details on the data packets G ASCII code 71 decimal GO button Tester will behave as if the on screen GO button had been pressed The GO button in question is the button that appears on screen after initial power up of the HBLT K ASCII code 75 decimal OK button Tester will behave as if the on screen OK button had been pressed If a test is in progress or the OK button is not currently being displayed this command is ignored l lower case ASCII code 108 decimal2. YYY the peak pressure in test units and ZZZ is the time elapsed since the pressure started ramping up in the current cycle Example DB360 500 4 2 lt cr gt Burst at 360 units peak 500 4 2 seconds The HBLT emits this message when a leak occurs However during streaming data mode the message is displayed after the test completes DK ASCII codes 68 and 75 decimal respectively test completed no errors This response code is followed immediately by XXX YYY cr where XXX is the peak pressure in test units and YYY is the time elapsed since the pressure started ramping up in the current cycle Example DK1130 8 1 lt cr gt Leak at 1130 units 8 1 seconds The HBLT emits this message when a leak occurs DL ASCII codes 68 and 76 decimal respectively test aborted leak condition This response code is followed immediately by XXX cr where XXX is the peak pressure in test units Example DL29 lt cr gt However during streaming data mode the message is displayed after the test completes F ASCII code 70 decimal waiting for start button This character is transmitted after a test is prepared and ready to run and also after 8 PSI of back pressure is detected during the Fill pre testing process The latter only occurs when the Fill speed setting is enabled H ASCII code 72 decimal Machine sign on At power up the system will send a message like HBLT 1800 PSI ver 1 40 lt lf gt lt cr gt indicating the appro
3. Lot number string Tester will behave as if a string were typed in response to the lot number request Type up to 14 characters followed by a carriage return or linefeed This command must follow the r command o lower case ASCH code 111 decimal Operator string id Tester will behave as if a string were typed in response to the operator id request Type up to 14 characters followed by a carriage return or linefeed This command must follow the r command R ASCII code 82 decimal START button Tester will behave as if the on screen START button had been pressed If a test is already in progress or there is no START button currently being displayed this command is ignored r lower case ASCII code 114 decimal execute process command The lower case r must be immediately followed by the exact spaces punctuation and case sensitive test name and then a carriage return ASCII code 13 decimal If this test name matches one of the tests in the HBLT memory it will be loaded and ready The system should typically respond with an F waiting to start A response of followed by the test name happens when no match is found A non response within one or two seconds would indicate that the HBLT was busy running a test or in another mode purge or engineering menus for example and cannot accept run commands The test name need not be terminated with a carriage return if its length is exactly ten characters long NOTE Most tests contain no l
4. Part of this function may include burping clicking noises as the inlet valve switches on and off in an attempt to equalize pressure between the HBLT cylinder and the product being tested Compliant products in particular can cause this kind of activity When the outlet pressure has been equalized the HBLT will put up a wait message while its cylinder refills with water it will then be ready to go showing a START button Pressing START will either begin the test or start the Fi function depending on the test s Fill speed setting In the event the test has a Fill speed specified the words Press to fill will appear beside the START button Pressing START will then pump water slowly into the product being tested until 8 PSI of back pressure exists and then the Cylinder will refill itself This refilling may again cause burping as mentioned above especially with compliant products The words Press to fill will be erased and the words Press START to begin will appear at the bottom of the screen Pressing START will then commence testing Tests run to completion unless a fault burst or leak is detected During the test the screen displays what state the machine is in what cycle it is on and the current and target pressures The only other way to interrupt a test is to either press the on screen STOP button or to open the safety door assuming that a safety door switch is enabled After the test is stopped you may resume the
5. and down arrows next to these words New settings will appear at the top of the screen as you adjust Touch the OK button to save the new information or ESC to exit without changing the current settings Print the manual This Engineering Menu function will print an abbreviated version of the Owner s Manual Make sure that a printer is connected turned on on line and has paper loaded You have the option of stopping the printout while in process by pressing the NO button that appears in the message box Purging Purging is the first of the choices appearing on the Main Menu The object of purging is to remove air bubbles from the fluid path inside the machine The HBLT should be purged prior to each use Water will exit from this outlet when purging so it is advisable to set it up so that it may drain into a suitable container Select Purge the tester from the Main Menu There are two purge modes available The first purge mode is continuous purge This purge mode is useful when filling the HBLT for the first time and for filling test fixtures The second purge mode is single cycle purge This purge mode uses a syringe and a graphic display to purge trapped bubbles from the system Check that the water reservoir connected to the HBLT is installed properly and contains clean distilled water Touch the OK button If you select continuous purge the HBLT displays a text screen that shows exhaust or intake status There is a STOP
6. button to exit continuous purging If you select single cycle purge a graphic display guides you through the purging process Use the syringe and follow the instructions on the HBLT display The use of the syringe is the best method for removing trapped bubbles from the system Be sure and pull a hard vacuum when directed by the display Touch the DONE button when you are finished purging the machine Do not allow air to be pushed or pulled into the machine HBLT User s Manual page 10 Select Output Format This menu allows the operator to select the items and data rate that the HBLT sends out the serial port during remote operation with streaming mode enabled There are five options for items transmitted 1 Test state followed by a colon The states are E A he Bo oe R Refill state after a burst or leak is resumed U Ramp up u Ramp up paused by operator M Maintain m Maintain paused by operator W Dwell w Dwell paused by operator D Ramp down d Ramp down paused by operator L Last ramp down Last ramp down paused by operator Burst during ramp up 2 Burst during maintain or dwell 3 Leak during dwell 4 Leak dip during dwell 5 Burst during ramp down 6 Burst during last ramp down 7 Burst during bottom maintain B Bottom maintain b Bottom maintain paused by operator 2 Sequence number of data followed by a comma This also corresponds to the time fr
7. that may be selected A yes or NO button is displayed depending upon the current state of that field To change a state touch the corresponding button A confirming message with a YES NO response is displayed Make your choice The volume field is a special case If this field is selected another menu appears so that you may choose volume units of encoder count total encoder count increment volume in milliliters total or volume in milliliters increment Touch the button next to the units desired A YES NO window appears to confirm When you have selected the units you want touch the ESC button to return to previous menu 6 Touch PAGE to view the second page of the Output Format menu Here you may select the data rate or optional column headings 7 Touch the button for Set the data rate and a new screen appears with the values of 100 50 20 10 5 2 or 1 Touch one of the rates to select 8 Touch the Output column heading button to select column headings A YES NO window confirms your choice Only headings for the columns you requested on page one are output Selecting and Running a Test Run a test is the second option shown on the Main Menu This will permit you to recall previously specified test profiles programs and run them Test results will be sent to the printer if attached On screen prompts and buttons make selecting running and viewing results of programs simple Name and Lot Code information are entered by on scre
8. NO APPLICATION PRESENT Please begin downloading new application Downloading requires that a computer usually a PC compatible be attached to the serial port and a special application run on the PC that downloads application data into the HBLT When downloading is invoked via the System Configuration menu the screen indicates that it is waiting for download data to begin This screen also features a STOP button that you may use to abort the downloading before it begins and large numerals counting down minutes and seconds The minutes and seconds indicate how much time remains before the download request is automatically canceled usually starting from five minutes Once downloading begins the screen will show a Download ID and Received ID These both should read BLT for standard software versions Below this information will be a Record Addr short for record address This displays hexadecimal numbers that count up as the application data comes into the system At the bottom of the screen will be status messages The normal status should read Receiving data Download Status Messages The following is a list of status messages and their meanings that may appear on the bottom of the downloading screen All messages are informational the downloader automatically makes whatever corrections and retries if it can After a number of consecutive errors occur the process will abort and the screen will indicate the problem and or prompt t
9. P R E S S U R E This is a custom pressurization profile It works like Incremental mode except that each successive Target Pressure is defined individually Up to 100 successive Target Pressures can be defined for a given test These custom target pressures need bear no relationship to each other one target may be greater than less than or equal to any of its neighboring targets HBLT User s Manual page 19 Editing Buttons When creating or editing test information most data entry screens feature a number of editing buttons along the bottom row These are editing buttons ESC The ESC escape button appears on screens enabling you to abort the process of entering or selecting information It is also used to close menus or submenus and return to a previous level of selection BACK The BACK button is used to step backwards in a multi step procedure such as entering or editing test information Pressing the BACK button permits you to step backwards and change a setting you just entered and the setting previous to that one and so on Arrow Buttons When entering numeric values a right pointing arrow button appears When entering alphanumeric information a left pointing arrow button appears These are backspace keys used to erase the last digit or character just entered SPACE The SPACE button inserts a blank space when typing in alphanumeric information 1 e test name product ID operator name and so f
10. PSI per second Theoretically this should take 1 10 of a second In practice the motor has to begin decelerating almost as soon as it starts accelerating To manage this the HBLT program applies rules to bound the actual rates used internally to achievable values This is generally invisible to a user It is important to realize that what the HBLT does is attempt to accelerate to the operating ramp rate and then decelerate to zero speed at the target pressure As a result the time to achieve a given pressure will not be the pressure change divided by the ramp rate It will always be a longer time The smaller the pressure jump the greater the exaggeration will be HBLT User s Manual page 32 Appendix D Option jumpers The main circuit board containing the HBLT electronics and logic are six option jumpers that define what model pressure and features apply to the specific model HBLT you have There are no jumpers here intended for customer use they are all factory use only and should not be changed or removed HBLT User s Manual page 33 Appendix E Downloading Downloading is the process of programming the HBLT with a new application or software that permits operation running and defining tests and so forth Usually downloading is invoked by requesting it via the System Configuration menu In the event that the reprogrammable memory circuits inside the HBLT lose their information a message will be displayed similar to
11. ae noelia 13 Test Definition and Manr inicia 15 Definition Of Terms tinelli d deb eps 15 Pressurization Modes or Types of Tests sesseeeeeeeee 18 Lincar RAMP mE 18 O O ah tsosa 19 Pati i 19 A A deti bu m 20 HBLT User s Manual page 2 Editing Bu Osa usse iii 21 ES Comeran e a Oe a icu fu 21 BACK desees uu Leu 21 JATOW BUMONS iecit d A AA edi de i cede nda 21 SPACE chio ON 21 O O 21 KS So due tuns M a 21 EMPAT 21 Fast Ramp Pressure 22 Defining a New Te Sb doe odora ae tlt qu eed a ged e c 22 Editing an BxisUBP de N 23 Deleting Test c pen e rra eite du cuu ee cu pue 23 A dotes cause Mite m e Ec usd 23 A edes td sed a Matar 24 Exporttis Dest feo accede taped E E E edens caes 24 Changing the passWOEG as sige sy abb ha diete a 24 Preventive Maintenance scott rd 25 TROUGHS CHOON n nic ti odo ice disset ted aiden fate fo emen 25 Water Piller eio ce to a e dt 25 Fault CODGIEBODS ione A E EAE AA AA ae 26 DCHA os 26 Motor Stalled it niet eieade R Oana AEE 26 MV SEES SANS rs ce Fo eqq EEE e si idt meos 26 Appendix A Serial Remote Control eee eene eene 27 SECUACES 27 Remote Control Features a 27 Response COM Sa edocet me eus t eens a 29 Appendix B Model Pe aa 31 Appendix C Special note about ramp rates oooooonococcnncccnoncnononcnonnnnonnncncnonencnnnnnos 33 Appendix D Option JUMPerS en onde deed na e A 34 Appendix
12. automatically adjusts for hard to pressurize conditions such as compliant products In the event that the HBLT cannot effect pressure increases after 5 seconds of effort it will assume that its motor has stopped working and will display a Motor stalled message In order to clear this error turn off the HBLT and after a moment turn it back on again Check to make sure that the product undergoing testing is properly attached to the outlet and that water flow is closed off HBLT User s Manual page 24 Overpressure If the pressure exceeds a safe limit an over pressure error will be displayed This typically cannot happen under normal test circumstances unless some outside force is applying extreme pressure back into the ABLT Another possible cause is incorrect calibration which would allow the machine to attempt what it reads is a permissible pressure that is actually out of range HBLT User s Manual page 25 Appendix A Serial Remote Control Serial Remote Control is an option found on the second page of the Configuration Menu Enable remote control and Select Remote Output When set to YES this option will permit remote operation of the tester as if an operator were pressing buttons on its touch screen The baud rate at which remote operations commence is whatever rate is set in the Configuration Menu page 6 Set the baud rate Note that the commands below are not those used by the Pressure Commander software Pressure Com
13. for which an item under test will be pressurized at the Target Pressure Dwell Time begins when the Target Pressure is first attained Dwell Time includes within it the Maintain Time Fast Ramp A pressurization method that can be applied to any test type intended to maximize pressurization stress at the cost of target pressure achievement accuracy The hydraulic pressurizing system runs at maximum possible speed throughout most of the upward pressurization cycle Fill Speed The rate at which water is pumped into a product before a test begins Each test contains its own fill speed specified in terms of cubic centimeters per second Select from 4 00 to 01 cc sec in 01 cc sec increments When this is enabled for a particular test e g reads some value other than NO FILL water is pumped through the outlet at this rate until a back pressure of 8 PSIis achieved then the test waits to begin its programmed pressure cycle s Firm Product A part made from plastic or other material which will expand very slightly under pressure before failure Examples certain balloon catheters junctions fittings HBLT Hydraulic Burst and Leak Tester Initial Pressure This is the first and lowest programmed pressure the HBLT will achieve during a test Leak Dip This is the pressure drop in absolute pressure from the end of the maintain portion of the dwell cycle A leak dip will be reported during the Dwell Time of test when the Dwell Time exceeds
14. of test its name and the Pressure Units may be edited Select Edit on the Test Editing Menu Touch the menu button next to the name of the test to be changed Each of the settings beginning with Product ID will be presented just as when entering a new test You may change any of these Simply touch the OK button on screens that do not require changes The new values are automatically be saved after the last screen has been optionally edited If any settings change the HBLT will ask what to do with these changes You may choose to save the changes into the original test updating it save the edited test under a new name or discard the changes Once a test has been edited a button appears on screen to enable the Quick Start function This button appears with the language Run Process MYPROC where MYPROC is the name of the test recently edited Deleting a Test Select Edit test information from the Engineering menu Select Delete on the Test Editing Menu Touch the menu button next to the name of the test to be deleted Review the information about the test selected and touch OK if this is the test intended to delete Touch YES to confirm deletion of the test Printing a Test Ensure that a printer is connected to the HBLT and that it is turned on and paper is loaded Select Edit test information from the Engineering menu Select Print on the Test Editing Menu Touch the menu button next to
15. the name of the test to print The test parameters will be immediately printed Importing a Test This feature allows you to send information that defines a given test from one HBLT instrument to another Using a Crescent Design customized serial cable connect two HBLT instruments together via their serial ports located on their back panels HBLT User s Manual page 22 Next go to the HBLT instrument that is to receive test information and select Import from the Test Editing Menu Go to the HBLT instrument that is to send test information and select Export from the Test Editing Menu Follow the instructions under Exporting a Test Data transfer usually takes only one second If you attempt to import a test with the same name as an existing test you will be prompted as to whether to overwrite an existing test If you attempt to import a test and the test memory is already full you will be prompted to delete an existing test or to abandon the import If information is not received within three minutes the Import screen will automatically time out returns to a menu Once a test has been successfully imported a button appears on screen that enables you to Quick Start it This button appears with the language Run Process MYPROC where MYPROC is the name of the test recently received Exporting a Test Select Export a test from the Test Editing Menu Touch the menu button next to the name of the test you d li
16. 61 decimal status report responding to remote query This response code is followed immediately by XXX YYY cr where XXX is the current pressure in test units and YYY the peak pressure in test units ASCII code 58 decimal streaming data report This character is followed by a sequence of digits as many as four representing current pressure including a preceding minus sign if appropriate a comma and another sequence of digits as many as five again with preceding minus if appropriate representing the number of steps the actuator took since the last sampling period then a carriage return The pressure will be in the type of engineering units specified for the test Example data responses would be without quotes 50 5 cr and 5 100 lt cr gt ASCII code 63 decimal remote test name rejected This character is followed by the test name up to 10 characters long and a lt lf gt lt cr gt sequence This is always in response to a remote command r followed by a test name that does not match any in memory Since test names are punctuation case and space sensitive common errors can be having an unintentional space or other character follow the r command or in sending a lower case test name when most all tests contain no lower case ASCII codes 68 and 65 decimal respectively test aborted by operator safety door open RESET via remote control or front panel This response code is followed immediate
17. E Download uoo A ei eque Ua IRAN 35 Download Status Messages 25 Ehe ders tn 35 HBLT User s Manual page 3 Address RA e eee Biv de A E ede eoe EE Ree 35 Character time assess 35 Data C RC Orb ti A A A tue ce pidesiess 35 Download aborted aq ie S a pes 36 Download succeeded oe e Dee oti e ad abes 36 Er sitie database capi idos is ad tes 36 Erasing unused EEPROM usual 36 Last DlOGK A E RT 36 NO APPLICATION PRESEN atan 36 Receiving il o tes 36 Reccivme last block esinaine fe ertt edite ja ea aad te 36 Title TOCOELG A C CMS ee 36 Waiting TOr TeCORG aen a A id 37 Watine TOESEdELS iecore ee eio bari tesc ESS 37 Wulle failed T E ESN 37 Appe dix F Tro blesBooOLng eroe eer dud 38 HBLT User s Manual page 4 Introduction The Crescent Design Hydraulic Burst Leak Tester HBLT system uses distilled water to accurately pressurize a single item according to programmable profiles These programmed profiles are referred to as tests The HBLT features simple yet extensive menus for defining saving and running up to 20 different tests as well as special functions The HBLT has a backlit LCD screen with a touch sensitive front for user input Pressurization is achieved using a hydraulic cylinder Its piston is driven by a motor connected to a linear actuator The system is controlled using Crescent Design Inc proprietary electronics and firmware With optional Pressure Commander software PC compatible computer systems
18. Hydraulic Burst Leak Tester Owner s Manual Software Version 1 62 Released November 1997 Crescent Design Inc 9932 Mesa Rim Road Suite B San Diego CA 92121 Voice 858 452 3240 FAX 858 452 3241 Table of Contents TOUS 5 Machine A oot ee pest Lascaris e doce ag aeo t aaeanoa 6 Turning on the HBLL 5 dre ieu ai e RE pst D e bela t V E VS Rs 7 EAS A uem utet utente ec M cM edt uL M DP PU dink tiu a 7 Engineering Menu ite nine 7 Edit te st informat onsite a eio nt do aoc beUa Secure Red 7 Perform calibrations a1 uiii en olco das 8 SySEIBIDCODPIPHESUOT d c esses sorta ee tute A add oie dua N a PM EUR t eas 8 Set the baud rate a i tenir ot dio tei ade rettet NU eG eae 8 Measurement Deep option nyers chp evt eese CP Ino nihit dun dudes po PN IR RIN 8 Pape eject OpBOT a hdi e eco ERR Ue DERE IA iii il CURRUS 9 A ooo tiedemestanaselva a atta tataulye tia daseataneseeucinaiee tas E 9 Enable safety doi ies 9 Next Partio io ii 9 Enable remote control 2 23 2 1I boo illa 9 Select Remote OMPI su coat teas RUM Module socrus Rp VEU eiua 9 Diagnostic Metu e 9 TouchScreen ESL coi caidos does de 10 Pr ssurization COUNE 2 5 8 Iu EU but uel iei tion 10 Download NEW POST ANI dioe tpa uetus daa tu qe tops vete ad RN 10 Set the date amp tne aiii 10 Print the mama tuu atia daa Saas a o o aea Get o ce 10 gts pa TET 10 Select QUE DUE Format AUD 11 Selecting and Running a Test eee indicate e Pune He rasa ino le Pes
19. Pressure Commander is an integrated editing and testing application that makes the HBLT act as a slave to the PC Pressure Increment This is the amount of additional pressure added to the Target Pressure of the previous cycle to obtain the Target Pressure for the next cycle This is used in Staircase and Incremental modes see the section on Pressurization Modes Pressure Units The HBLT works with three different engineering units Pounds per Square Inch PSI atmospheres ATM and KiloPascals kPa Pressure units are selected when a test is defined and apply to all data displayed or printed by that test including via remote control Once pressure units have been selected they cannot be changed when editing a test Purge The process of emptying air out of fluid pathways There is an option on the Main Menu to perform this function Also see Fill Purge speed The rate at which water is pumped through the outlet during the Purge function This is one of the System Configuration settings in the Engineering Menu Ramp Rate This is the rate at which the HBLT achieves pressure expressed in Pressure Units per second There are two ramp rates specified in a given test These are called Up Rate and Down Rate Ramp Down The part of a cycle in which pressure decreases Also see Up Rate Ramp Up The part of a cycle in which pressure increases Also see Down Rate Ramp Rate Repeat Cycle A test setting that controls how many times a p
20. articular cycle will repeat until the next step Return Pressure This is the programmed pressure that the HBLT will depressurize to at the end of a given cycle This may be set to VACUUM Rigid Product Metal or stiff plastic parts undergoing hydraulic testing Such parts virtually never stretch under pressure only fracture Examples are end caps and valves Rubbery Product Products that easily inflate when pressurized and can conform to enormous increases in hydraulic volume before failure Large volume vinyl and latex products fall into this category Stretchy Product Flexible products that stretch significantly when undergoing pressure Large volume vinyl products bags may fall into this category HBLT User s Manual page 16 Target Pressure This is the programmed pressure that the HBLT will achieve during a given cycle Total Cycles This is the computed total number of pressurization de pressurization cycles performed during a test taking into account Repeat Cycles and how many steps may be required to achieve Maximum Pressure Up Rate The speed at which pressure is applied during a test cycle This is expressed in terms of Pressure Units per second See also Down Rate Ramp Rate Vacuum Any state of negative pressure typically a small number of Pressure Units below zero A severe vacuum many Pressure Units below zero usually cannot be achieved by the HBLT Pressurization Modes or Types of Tests Linear Ramp L
21. can be used to edit store recall print and run complex tests of several hundred steps The HBLT may therefore run as a slave to a PC compatible system or stand alone switching back and forth between these modes Leaks detected by the HBLT are defined in terms of drop in pressure over 1 second or by absolute drop in pressure from the end of maintain Bursts also known as ruptures are essentially dramatic rapid leaks In order to detect these hydraulic faults the HBLT checks for pressure drops every one tenth 0 1 second This manual contains complete instructions for setting up and using the HBLT HBLT User s Manual page 5 Machine setup Perform the following steps before using the HBLT Read through all steps before starting The HBLT is a heavy instrument so keep in mind that wherever it is set up should be a permanent location 1 Remove from carton Carefully remove the HBLT from its packing carton It contains electronic and mechanical components that can break if dropped Set it on a level operating surface where the height of the touch screen display is convenient for an operator The HBLT operates best in an environment where the temperature is between 60 and 80 Fahrenheit Since it operates on distilled water and has sensitive components care must be taken not to expose the unit to temperatures much outside this range 2 Connect power The operating voltage on the HBLT is selectable between two voltage range
22. en keyboard which includes alphanumerics some punctuation backspace and erase clear keys To prepare for testing attach an item product to be tested to the pressure outlet on the front of the HBLT Touch the menu button next to Run a test on the Main Menu The next prompt asks for Operator Name This is optional meant to identify who ran the test on its report if printed Touch the OK button in the lower right hand corner once this information has been entered HBLT User s Manual page 12 The next screen prompts you to enter a Lot code This is optional information that will appear on printed test reports Touch the OK button once entered A menu of currently stored tests will then appear Ten test names fit onto the display up to twenty tests may be defined Undefined tests are listed as undefined Touch the PAGE button to switch between the screens of test names Touch the menu button next to the name of the test to be run A new screen appears showing the information about the test selected Touch the OK button if the information displayed corresponds to the test intended to run Touch the ESC button if you decide not to run this test If OK was pressed the machine will ready itself When this action is complete the test screen will appear saying BURST LEAK TESTER READY at the top In the event that hydraulic pressure exists at the outlet at the onset of the test the system will attempt to depressurize
23. enu contains an option for purging Purging is the process of pumping water through a product and whatever interconnected tubing with the goal of removing any air that may be trapped inside The purge speed option allows you to specify at what rate water will be pumped out the exhaust when purging Some products have a very small passage for fluid and others have relatively large passages Please note that this option adjusts the purge function only Individual tests have a separate and different setting for filling HBLT User s Manual page 8 Enable safety door The HBLT has an optional connection for a safety switch assumedly connected to an enclosure where products are hydraulically tested When this option is enabled set to YES no testing will commence until the safety switch indicates that the safety door of such an enclosure is closed Next page gt gt The Configuration Menu has two screens one with the settings mentioned above and a second screen with the two options mentioned below The Next Page button switches between these Enable remote control When this option is set to YES special characters received on the serial channel obeying whatever baud rate choices are set above will enable Remote Control of HBLT tests as if an operator were pressing on screen buttons The optional Pressure Commander software also requires that this option be set to YES Please refer to Appendix A for an explanation of the remote cont
24. equency count 3 Current Pressure followed by a comma 4 Peak Pressure followed by a comma 5 One of four volume options followed by a comma If this option is selected the operator has a choice of encoder counts from start of test encoder counts since last data item volume in milliliters since beginning of test or volume in milliliters since last data item The last delimiter of the items selected is replaced by a single carriage return The rate of data output is also selectable Choices are 100 50 20 10 5 2 1 samples per second If the CPS characters per second based on characters to be sent and the serial port baud rate is such that overrun is likely to occur a warning window is displayed During streaming operation the burst and leak reporting is suspended until the end of the run This allows simpler data cleanup when data is imported into spread sheet programs HBLT User s Manual page 11 The user has the option of including a headings record This allows headings for charts and tables in spread sheets To get to the screens do the following steps 1 Touch Engineering menu button on main menu 2 Touch System configuration button on engineering menu 3 Touch PAGE button to get second page of system configuration menu 4 Touch Select remote output button on second page of system configuration menu 5 Youare now at the Output Format Menu The first five options are the fields in order of appearance
25. er properly loaded before you attempt any printouts If the printer is not selected reports will be buffered up to a HBLT User s Manual page 6 maximum of 6000 characters An optional page eject can be sent after each report When a printer is switched off or no longer connected buffering is canceled 5 Prepare the machine The HBLT must be calibrated and purged before its first use It is not calibrated prior to shipment Please refer to the instructions about purging and also those for calibrating the sensor Engineering Menu Calibration section later in this manual Pressure calibration is not accurate until the system has been purged of air Turning on the HBLT When the HBLT is turned on it will beep and then prompt you to proceed with calibration Once calibration is performed switching it on will then beep two long three short and show the greeting screen with the Crescent Design logo the software versions kernel and application and maximum pressure for your particular machine Press the on screen GO to proceed to the main menu Main Menu This screen allows the user to go to the purging screen perform a test or access the engineering menu screen The engineering menu allows tests to be created and edited Engineering Menu This screen offers the choices described below as well as the means to jump back up to the main menu Edit test information This takes the user to the screen where tests are created chan
26. ester may interpret as a mild burst It is recommended that the Burst Rate be set to higher values for FAST RAMP tests FAST RAMP pressurization consists of two phases full power pressurization and controlled target acquisition Full power pressurization starts immediately and runs for as long as it can without running risk of going over pressure Then a controlled ramp rate decelerates to goal Defining a New Test Select Edit test information from the Engineering Menu Select New on the Test Editing Menu Select the type of test see definitions above Enter the information requested at the prompts Each type of test uses a different number of settings The HBLT prompts you to enter each of the settings displaying minimum and maximum allowable values each time If you enter a value that is out of range for a test you will be prompted to correct the value If an incorrect value is entered there is no need to quit It is easy to go back and change values by Editing a test see below The test will be saved automatically when all parameters have been entered Once a test has been created a button appears on screen that enables you to Quick Start it This button appears with the language Run Process MYPROC where MYPROC is the name of the test recently created HBLT User s Manual page 21 Editing an Existing Test Select Edit test information from the Engineering menu Note that all test settings except for the Type
27. ged deleted printed imported and exported It is also where the password is changed Perform calibration This choice comes up automatically when the HBLT is first installed and also may be accessed by touching the menu button labeled Perform calibration on the Engineering Menu As the screen prompt instructs open the pressure outlet to the atmosphere Touch the ESC escape button to abandon the calibration or OK to continue When continuing attach a calibrated pressure source to the output port of the HBLT This source should be capable of generating precise pressure near to the top of the HBLT s range Apply pressure and adjust the displayed pressure on the HBLT screen so it matches your calibrated pressure source On screen up and down arrows permit on screen adjustments The small arrows HBLT User s Manual page 7 are for fine adjustments and the large arrows for coarse Press the on screen OK button to complete the calibration or ESC to abandon it When calibration is complete new offset and span values are saved in non volatile memory These values are critical to calculations necessary to convert the pressure readings taken by the HBLT into engineering units PSI atmospheres etc These values will be in force until the next calibration is performed System configuration System configuration consists of setting the criteria for communication with the HBLT Below are the options and what their definitions Mo
28. inear Ramp P R E S S U R E Continuously increasing pressure is applied to a product until it reaches its Target Pressure then stays at that pressure for the Dwell Time or until a burst or leak is detected HBLT User s Manual page 17 Staircase Slaircase In Z0 C OQ ITI ZU U Pressure increases to programmed Target Pressure and remains for the Dwell Time If no burst or leak occurs pressure is then increased by the Pressure Increment amount The test continues until a burst or leak is detected or until Maximum Pressure is achieved Fatigue P R E S S U R E The Fatigue mode repeats a single defined pressurization cycle Pressure increases to a programmed Target Pressure Product will remain at pressure for the specified Dwell Time and then de pressurized to the Return Pressure This repeats for the Repeat Cycles defined for the test HBLT User s Manual page 18 Incremental Incremental In Z0 C O0 Q0 ITI ZU U Pressure increases to programmed Target Pressure and stays there for the specified Dwell Time If no burst or leak occurs the pressure is decreased to the specified Return Pressure level This repeats a specified Repeat Cycle number of times Once the Repeat Cycles complete a new Target Pressure is computed by increasing the previous pressure by the Pressure Increment amount The test continues like this until a burst or leak or the Maximum Pressure is achieved Custom Custom
29. ing when starting a test because of their elastic nature Burst Rate This is the pressure drop rate expressed in Pressure Units per second A burst will be reported during Ramp Up or Dwell Time when pressure drops at a rate that equals or exceeds this Burst Rate Burst Rates must be higher than the Leak Rate specified for the same test There are two burst rates The first up burst rate is active during ramp up and during maintain dwell The second down burst rate is active during ramp down and bottom maintain Compliance The tendency of a product some plastics and rubber mostly to stretch or grow under pressure Compliant products seem to be leaking whereas in reality they are growing to accommodate a larger volume of water Long Maintain Times are recommended HBLT User s Manual page 14 for testing compliant products as well as generous Leak Rate settings Typically compliant products can only be practically tested for burst conditions Cycle A Cycle is a pressurization and corresponding de pressurization of an item under test Cycle Repeat This is the number of times the HBLT will repeat a cycle with its specific programmed Target and Return Pressures before proceeding to the next programmed Target Pressure Down Rate The speed at which pressure is removed during the Ramp Down part of a testing cycle The speed is expressed in terms of Pressure Units per second Dwell Time This is the maximum amount of time in seconds
30. ke to export The data for that test is automatically sent out the serial port in ASCII form The data is formatted to be intelligible by another HBLT instrument and may not be obvious to the operator It is possible to use a terminal program to record exported tests edit and later upload them into HBLT using ASCII data transfer Any unacceptable settings will be brought to your attention as well as related error messages should an imported test have problems Changing the password Tests and other Engineering Menu items may be protected with a password When a password is applied access is restricted To enter or change a password press the Change password button on the Edit Test Information screen off the Engineering Menu If an existing password is in place you must enter the previous password before proceeding If you choose to change the password you must enter it twice the second time for confirmation If the confirming entry matches the initial entry the new password will take effect and further attempts to access certain functions will require passwords When entering the password the HBLT displays asterisks instead of the entered characters This feature helps secure the password To disable the password go to Change Password and enter a blank password by pressing Clear then OK Confirm this and the password will be deleted Preventive Maintenance Except for the touch screen display no special external cleaning
31. ly by XXX cr where XXX is the peak pressure in test units Example DA 1200 lt cr gt ASCII codes 68 and 66 decimal respectively test aborted up ramp burst condition This response code is followed immediately by XXX YY Y ZZZ lt cr gt where XXX is the burst pressure in test units Y Y Y the peak pressure in test units and ZZZ is the time elapsed since the pressure started ramping up in the current cycle Example DB360 500 4 2 lt cr gt Burst at 360 units peak 500 4 2 seconds The HBLT emits this message when an up ramp or dwell burst occurs However during streaming data mode the message is displayed after the test completes ASCII codes 68 and 67 decimal respectively test aborted down ramp burst condition This response code is followed immediately by XXX Y Y Y ZZZ lt cr gt where XXX is the burst pressure in test units Y YY the peak pressure in test units and ZZZ is the time elapsed since the pressure started ramping up in the current cycle Example DC360 500 4 2 lt cr gt Burst at 360 units peak 500 4 2 seconds The HBLT emits this message when a down ramp or bottom maintain burst occurs However during streaming data mode the message is displayed after the test completes HBLT User s Manual page 28 DD ASCII codes 68 and 68 decimal respectively test aborted leak dip condition This response code is followed immediately by XXX Y Y Y ZZZ lt cr gt where XXX is the burst pressure in test units
32. mander interacts with the HBLT using a more complex proprietary control language that is not documented here Selecting a test The tester s Main Menu offers an option for Run a test An operator must use the touch screen to choose this option enter their Operator ID and Lot Code information and then select the test to run After selecting a test the screen shows test information and the operator must also press OK to confirm the test selection See also the remote command TD code r for a remote control method of selecting tests Remote Control Features The main test screen which shows BURST LEAK TESTER READY at the top may be controlled either by an operator or by characters coming in the serial channel The following describe characters and their function NOTE In the descriptions below lt cr gt stands for an ASCII carriage return code 13 decimal If stands for an ASCII linefeed code 10 decimal Examples in quotes use the quotes to delimit the message the quote characters themselves are not part of any message ESC ASCII code 27 decimal Return to main menu Once the main menu is displayed no further serial input is accepted until an operator selects another test as described above If a test is already in progress or there is no ESC button currently being displayed this command is ignored A ASCII code 42 decimal HBLT RESET command This is a software function that has no on screen button equivalent
33. o begin downloading again Address err The application data was received with an improper programming address The system will automatically progress to another status message if correct data does not come in within a certain amount of time Character timeout A generous amount of time has elapsed since any data was received If this message lingers it may suggest a poor connection between the HBLT and the PC compatible performing the transfer After successive failures to communicate the system will progress to show an abort message Data CRC err The application data was received with improper formatting or checksum The system will automatically progress to another status message if correct data does not come in within a certain amount of time HBLT User s Manual page 34 Download aborted The download process had too many problems in receiving data including the lack of data Several attempts have been made to recover and retry without success Usually an OK button appears on screen After pressing OK the download will start over from the beginning Download succeeded The application has been received initialized and is about to be launched The application s main greeting screen should appear almost instantly Erasing database The application has been received and the end of data message was correct The application is being invoked with the express purpose of erasing any process database information left ove
34. of the HBLT instrument is necessary HBLT User s Manual page 23 Touch Screen It is important that only a soft damp cloth be used to clean the touch screen on the HBLT Nothing sharp or potentially abrasive should be used Do not use paper towels to clean the screen as they can be abrasive to the touch screen surface Water Filter The water filter should be replaced every 3 months Follow these steps to change out the water filter 1 Remove the power cord from the back of the HBLT Remove the 8 screws that hold the cover on Carefully remove the cover of the instrument A WON Locate the water filter It is held down by clamps in the center of the hydraulic subassembly Release the hose clamps Remove the hose from the filter and replace the filter with a new one Replace the hose clamps Replace the cover Oe LON On Attach the power cord 10 Turn on the instrument and purge it thoroughly Fault conditions An internal fan in the HBLT runs when needed to keep certain components cool You may hear the fan cycling on and off while a test is running This is normal Overtemperature Temperature sensors inside the HBLT allow the computer to alert you in the case of over temperature conditions An error message will appear on the display if either the servo motor or electronics gets too hot In order to clear an over temperature error you must turn off the HBLT and turn it back on again Motor Stalled The HBLT
35. orth CLEAR The CLEAR button erases all alphanumeric information entered on a given screen or sets a numeric entry to zero OK The OK button acts as an enter key accepting the presently displayed setting Compliance Setting When defining a test a prompt appears asking for product compliance offering choices from 1 Rigid Product to 5 Rubbery Product Controlled pressurization requires special tuning in order to achieve goals accurately The means by which pressure is achieved when a product stretches under pressure differs from when a product does not stretch Valves usually are tested best at a Compliance Setting of 1 Rigid Catheters at 2 Firm Tubing at 3 Pliant bags at 4 Stretchy and latex at 5 Rubbery Certain products may be manufactured to be less compliant than their component materials may suggest Irradiated plastics usually increase in rigidity decrease in compliance for example Highly compliant products those best fit for settings 4 and 5 consume large volumes of water before showing any pressure at the sensor When Fill speed is enabled for a test it will attempt to pressurize a product to approximately eight PSI before starting the actual test Some very compliant products can burst at less than eight PSI as the sensor sees it since the HBLT User s Manual page 20 actual weight of water inflating the product can apply much more than eight PSI to its sides seams etc Highly complian
36. ower case characters Example rMY TEST cr The r command resets the operator id string and lot number string to null Use the I and o commands to set the lot number and operator id respectively after you issue the r command S ASCII code 83 decimal STOP button Tester will behave as if the on screen STOP button had been pressed If a test is not in progress or the STOP button is not currently being displayed this command is ignored X ASCII code 88 decimal export currently loaded process When the HBLT is idle in between tests including immediately after a test has terminated with or without error the description of the process presently being run will be sent via the serial channel exactly as if it had been EXPORTed via the Engineering Menu Note that decimal points are omitted tests set for atmospheres show numbers that actually represent atmospheres times ten e g a target pressure of 100 is actually 10 0 atmospheres PSI and kPa units are represented straight forwardly HBLT User s Manual page 27 ASCII code 90 decimal resume a test stopped by S command burst or leak If a burst or leak stopped the test the cylinder is refilled If stopped in a pressurized state the HBLT is re pressurized Response codes The tester will send various codes indicating test status by itself when a test is in progress or just stopping The following are the codes and their meanings DA DB DC ASCII code
37. priate PSI configuration and application version number M ASCII code 77 decimal maintain cycle ending This character is transmitted after any applicable pressure maintenance during a test If a test s Maintain pressure time setting is zero this character is transmitted each time the hydraulic pressure reaches its next goal If a test has a non zero Maintain pressure time then this character is sent after the Maintain Time expires However the HBLT does not emit this character when streaming mode is active HBLT User s Manual page 29 Appendix B Model Parameters 1000 PSI Model Parameters PSI Atm kPa Ramp Rate minimum per second 10 7 69 Ramp Rate maximum per second 500 35 0 3500 Initial Pressure minimum 5 3 30 Initial Pressure maximum 1000 68 0 6800 Target Pressure minimum 10 6 60 Target Pressure maximum 1000 68 0 6800 Return Pressure minimum VACI VAC VAC Return Pressure maximum 1000 68 0 6800 Increment Pressure minimum step 1 1 10 Increment Pressure maximum step 1000 68 0 6800 Maximum Test Pressure minimum 5 3 30 Maximum Test Pressure maximum 1000 68 0 6800 Leak Rate minimum per second 5 3 35 Leak Rate maximum per second 50 3 5 350 Up Burst Rate minimum per second 20 1 5 150 Up Burst Rate maximum per second 1000 68 1 6895 Down Burst Rate minimum per second 20 1 5 150 Down Bu
38. r from the previous version This is done because process data structure differs from version to version The system will automatically progress to another status message Erasing unused EEPROM The download process received all application data without error Unused memory locations are being erased for safety The system should progress beyond this step in a matter of seconds Last block err The end of data message was formatted improperly The system will automatically progress to another status message almost instantly NO APPLICATION PRESENT This message indicates that the application memory contains no data or whatever data it once contained lost integrity You must begin running the download program on a PC compatible before the HBLT can function Receiving data Application data is presently being received and programmed When things are functioning smoothly the new application will be ready to run in a matter of minutes Receiving last block The application data has been completely received and the end of data message is being checked for validity The system will automatically progress to another status message almost instantly Title record err The initial data was received but does not correspond with the expected values Typically the screen will show Download BLT and next to Received ID will be something other than BLT What appears next to Received ID may be useful information for diagnosing problems if thi
39. rol functions how they work and when they apply Select Remote Output This option allows the operator to choose the Select Output Format menu This menu allows the user to alter the output format and data rate used during remote operation streaming mode Diagnostic Menu This menu allows you to perform diagnostics on the HBLT and analyze its performance Touch Screen Test This screen allows you to test all the buttons on the HBLT s touch sensitive front panel The screen is filled with buttons which when pressed change to OK Press each button to determine if the button is operable Press the ESC button to return to the Diagnostic Menu In the event the ESC button is inoperable turn off the HBLT and contact Crescent Design for assistance Pressurization Count In order to give Crescent Design s technicians an indication of the HBLT s level of usage a counter is incremented every time the HBLT is pressurized The pressurization count screen displays this counter HBLT User s Manual page 9 Download new program This function permits the re programming of the HBLT by running the Crescent Design downloading program on your PC This program will be supplied to you with any software updates See Appendix E for more on downloading Set the date amp time This Engineering Menu displays the current time and date at the top of the screen Buttons allow you to adjust the MINute HOUR DATE MONth and YEAR by touching the up
40. rst Rate maximum per second 1000 68 1 6895 Leak Dip minimum 3 u 207 Leak Dip maximum 1000 68 1 6895 HBLT User s Manual page 30 1800 PSI Model Parameters PSI Atm kPa Ramp Rate minimum per second 20 1 5 150 Ramp Rate maximum per second 1000 70 0 7000 Initial Pressure minimum 10 5 50 Initial Pressure maximum 1800 120 0 9999 Target Pressure minimum 10 5 50 Target Pressure maximum 1800 120 0 9999 Return Pressure minimum VAC VAC VAC Return Pressure maximum 1800 120 0 9999 Increment Pressure minimum step 1 l 10 Increment Pressure maximum step 1800 120 0 9999 Maximum Test Pressure minimum 10 5 50 Maximum Test Pressure maximum 1800 120 0 9999 Leak Rate minimum per second 10 5 50 Leak Rate maximum per second 100 7 0 700 Up Burst Rate minimum per second 40 3 0 300 Up Burst Rate maximum per second 1800 127 4 9999 Down Burst Rate minimum per second 40 3 0 300 Down Burst Rate maximum per second 1800 127 4 9999 Leak Dip minimum 3 v 207 Leak Dip maximum 1800 127 4 9999 HBLT User s Manual page 31 Appendix C Special note about ramp rates Under certain conditions the HBLT may not be able to make a pressure jump at the requested ramp rate This typically occurs when small jumps are requested particularly at low pressures An example would be going from zero to 25 PSI at 250
41. ry The motor driver is too hot The circuits that power the motor that generates hydraulic pressure have overheated Continued operation would risk damage Let the system cool for five minutes with the power off If the problem re appears contact Crescent Design Can t configure machine Option switches or internal setup is incorrect Contact Crescent Design for assistance in solving this problem HBLT User s Manual page 37 Ver mismatch x xx y yy The Kernel version y yy is incompatible with the Application version x xx Contact Crescent Design for assistance in solving this problem Transducer not installed The pressure transducer is disconnected or malfunctioning Contact Crescent Design for assistance in solving this problem Unknown press config xxx The pressure limit xxx in PSI is unknown to the software This can also be caused by improper option settings or setup Contact Crescent Design for assistance in solving this problem Error code xxx An internal software error xxx was detected Contact Crescent Design for assistance in solving this problem HBLT User s Manual page 38
42. s It is shipped with the proper voltage setting for the intended destination If necessary use the power selector on the back of the instrument to switch between the 105 130 Volts A C and 210 260 Volts A C settings This selector is located just under the power cord receptacle To change it remove the power cord and pry out the selector then replace it in the desired orientation Connect the HBLT to a suitable electrical outlet with the power cord provided The HBLT consumes a maximum of 400 Watts and operates on any A C frequency between 47 to 63 Hz 3 Connect fluid A quick disconnect fitting with a built in shutoff valve is shipped with the HBLT Connect this fitting with a hose to a clean water reservoir Fill the reservoir with clean distilled water Connect the fitting to its mating half on the front of the HBLT IMPORTANT Do not connect the HBLT to any kind of pressurized water source Use a clean distilled water source only 4 Connect the printer The HBLT uses a printer for recording the tests that have been defined and for printing out the results of each test as it is performed see the corresponding sections of this manual for more explanation of these printouts The printer must use a standard parallel interface Attach a parallel printer cable to the DB 25 connector on the back of the HBLT Connect the other 36 pin Centronics connector to the printer Make sure that the printer is turned on on line and has pap
43. s occurs frequently The system will automatically progress to another status message if the correct initial data does not come in within a certain amount of time HBLT User s Manual page 35 Waiting for record Application data is received in bursts of information known as records A certain minimum amount of time has elapsed without a subsequent record coming in The system will automatically progress to another status message if another record does not come in within a certain amount of time Waiting for start This indicates that the initial data has yet to come in Typically the screen will show Download ID BLT and Received ID shows a blank The system will automatically progress to another status message if the initial data does not come in within a certain amount of time Write failed The memory circuits inside the HBLT did not program and verify properly The system will automatically progress to another status message if subsequent retries fail HBLT User s Manual page 36 Appendix F Troubleshooting If the HBLT will not operate when the power switch is turned on the most likely fault is the line cord pulling out of the wall plug or the IEC receptacle on the back of the machine If the machine still won t work check the fuse To gain access to it remove the line cord from the back of the machine and pry out the fuse carrier below it There are two fuses a two amp fuse for use in 230 volt locations and a four amp fuse for
44. st options have on screen buttons that read YES or NO All buttons or their prompts show their current settings for respective options To change an option touch its related button and then choose the new setting from the screen prompt Set the baud rate The baud rate is the serial data transfer rate into and out from the ABLT The Import and Export features under Edit Test Information use serial data transfer as well as the Remote control Pressure Commander and Download New Program functions When using Remote control be sure and select a baud rate high enough to accommodate the CPS characters per second that are output during streaming mode See Appendix A for details From the Configuration Menu touch the on screen menu button next to the words Set the baud rate Eight rates are shown in bits per second Touch the menu button next to the rate required or touch the ESC button to change the current baud rate Measurement beep option This option selects whether or not a beep is generated when the Maintain Pressure Time ends see below It is useful to cue operators on when to take a measurement after pressure has been applied to a product for a certain amount of time Page eject option If you want a page eject command to be sent after printed reports select this It is handy for cut sheet printers like lasers and inkjets Ejects apply to test summaries as well as process program printouts Purge speed The Main M
45. t products may need special test considerations e g testing a product encased in a rugged constrictive enclosure that prevents it from consuming more than a fixed volume of water Of course once inside a constrictive enclosure the product will not experience the same stresses that it would see in normal use Fast Ramp Pressurization Each of the five test types Linear Ramp Staircase Fatigue Incremental Custom ask for an Up Rate Most non destructive tests use a controlled pressurization rate that is entered on this screen in terms of engineering units per second PSI sec kPa sec or Atm sec The Up Rate screen features a FAST button which when pressed changes the requested Up Rate to FAST RAMP Any test created with a FAST RAMP Up Rate will pressurize as fast as possible within the limitations of the unit The effective rate in this case can be as fast as 1000 PSI per second more in some cases depending on model FAST RAMP is intended for destructive testing Target pressures are not achieved accurately during FAST RAMP testing FAST RAMP pressurization is very much like trying to move a car between two points using a stop go switch as opposed to an accelerator and brake A side effect of FAST RAMP pressurization is pressure backlash If a product is brought to a target pressure and does not fail the rapid stopping of the pressurization process causes a kind of hiccup in the pressure curve which the t
46. test by touching the Resume button end the test by touching the OK button or cancel testing and return to the main menu by touching the ESC button Resuming refills the cylinder re pressurizes the system depending on the state the test was stopped in and then continues with the test The results of each test are sent to the printer port at the end of each test The printout includes Test name specified test name Test Type Product specified product name Operator operator name lot lot name or number Start at date time End at date time Result If no burst or leak occurs No failure HBLT User s Manual page 13 If a burst or leak occurs time elapsed burst cycle number burst pressure and maximum pressure attained In order for results to be printed a printer must be connected turned on on line and ready before the test ends This is optional The HBLT will run through tests with or without a printer connected Test Definition and Management Definition of Terms Maintain pressure time Dwell time Pressure increment P H E o o U H E Initial target pressure Return pressure Ramp rate TIME Burping The process opening and closing the HBLT water inlet in order to equalize pressure between the hydraulic cylinder and a product being tested Burping causes the HBLT to make clicking sounds and can repeat several times before pressure equalizes Compliant products in particular cause a lot of burp
47. the Maintain Time Leak Dips during this period are defined as an absolute pressure drop See also Burst Rate and Leak Rate Leak Rate This is the pressure drop rate for leak detection expressed in Pressure Units per second A leak will be reported during the Dwell Time of a test when the Dwell Time exceeds the Maintain Time Leaks during this period are defined as pressure drops at a rate that equals or exceeds the Leak Rate See also Burst Rate Maintain Time This is a period of time seconds during the Dwell Time when the HBLT actively maintains the Target Pressure in the product under test This means that any pressure drops that occur due to compliance or small leaks will be compensated for by further pressurization Maintain Time begins concurrently with Dwell Time Bursts may be detected during the Maintain Time but leaks are not Maintain Time may be set anywhere HBLT User s Manual page 15 from Zero which cancels any pressure maintenance to the total amount of Dwell Time which cancels leak detection Maximum Pressure The highest pressure achieved via two or more cycles in a test such as the Staircase or Incremental modes Pliant Product Flexible tubing or other plastic products that will stretch or grow under pressure before failure Example vinyl tubing Pressure Commander Optional PC compatible DOS software that allows you to edit store recall print and run complex HBLT tests that may take several hundred steps
48. use with 115 volts Both are 5 x 20 millimeter SLO BLO types Do not use an ordinary fast acting fuse as the start up surge will blow it within a few power cycles WARNING When replacing the fuse carrier observe the markings to be certain you are installing it for the correct line voltage Below are shown a list of messages displayed by the HBLT under conditions in which operation is interrupted These messages are displayed on a special screen indicating ERROR ERROR ERROR at the top and bottom In some circumstances mentioned below you must take steps to correct the fault condition turn the ABLT off and then on again If you have successfully corrected the error condition you will be allowed to proceed Message Explanation Pressure limit exceeded The hydraulic pressure exceeded operational limits Remove pressure from the system manually by venting the outlet Excessive pressure can damage the pressure transducer One cause of this problem is miscalibration If it reoccurs soon after a calibration contact Crescent Design for assistance The motor is overheating The motor that generates hydraulic pressure has overheated Turn off the machine and contact Crescent Design for assistance Motor stalled Five seconds elapsed without any pressure change Check for proper attachment of product to be tested to the outlet and that water flow is cut off Switch off the HBLT and after a few moments switch on again and ret
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