ESP Pressure Scanner User's Manual
Contents
1. REL O 850 21 59m a 1 BLACK GND RED 8 a Papa LEADS 150 typ pg 3 81mn N y E KG o 150 typ A 3 81mm 4 200 8 32 UNC x 50 dp 12 7mm Page 31 www PressureSystems com ESP Pressure Scanner Users Manual Conventional ESP 64HD Heater Chamber Pressure Systems Inc 8 32 UNC x 50 dp 127mm 4 places wweg 6p kh 0961 wuwus Z MN 068 g GND X9v18 A8Cc GHAA RED amp BLACK LEADS OQOOOOOOO OOOOOOO QOOOOOOO AN ATS oor ISIS OOOOOOO OOOOOOOO OOOOOOOO 4 200 115 57MM O wu ge dA 09 150 typ 3 81mm www PressureSystems com Page 32 Pressure Systems Inc ESP Pressure Scanner User s Manual DTC Series ESP 32HD Heater Chamber 7 1 700 M 43 18mm 850 21 59m RED 28V a O y U lt p 2 NG Y 3 81mm a 4 550 8 32 UNC x 50 dp 12 7mm 115 57mm 4 places DTC Series ESP 64HD Heater Chamber D 1 700 43 18mm RED 28V BLACK GND 850 21 59mm 150 typ 7 3 81mm 4 1 950 49 53mm 150 Da PS 3 81mm 4 550 8 32 UNC x 50 dp 12 7mm 115 57MM 4 places Page 33 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual nn Appendix C Spare Parts PSI Part Number Description Maintenance Kit Universal maintenance kit for all ESP s2. C Note 4 For operation in a very cold environment 50 C it is important to set the temperature to above freezing 0 C so water condensation does not occur Note 5 Factory default temperature setpoint is 40 C Control Control Control Setpoints in C Setpoints in C Setpoint in Ohms Ohms Ohms 48 85167 az 55 55962 59 42491 49 58264 as 56 32418 60 21115 50 317 ag 52 54127 EN 61 00197 51 05483 EN 53 29005 KJ 61 79748 51 79623 EN 57 09291 KA 62 59774 54 09291 EN 57 86588 78 63 40287 54 79913 60 58 64319 BT 64 21291 Table 5 1 Resistance Temperature Chart Control Setpoints in Ohms 43 8225 44 53217 45 24462 Page 18 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 5 2 Temperature Sense Option The Temperature Sense option is only available on conventional ESP scanners and provides an analog output from a nickel foil RTD Resistive Temperature Detector located on the ESP amplifier PCB printed circuit board to indicate internal scanner temperature The signal is output via pin 15 of the electrical connector This option can be used with common data acquisition systems to perform digital thermal compensation of the sensors Silicon sensors are repeatable with temperature and once characterized can be compensated for thermal errors using algorithmic techniques A fourth order polynomial equation is generated for each sensor at standard temperature points of 25 O 25 50 and
3. C non linearity psi volt C4 non linearity psi volt Ve sensor voltage at P At a minimum a three point pressure calibration is required to generate a non linearity C2 term for each sensor The frequency of calibration is dependent on ambient temperature changes and electrical drift of the sensors with time An automatic calibration system is highly desirable for these scanners allowing calibrations to be made as frequently as practical A five point calibration performed immediately before a set of data is acquired assures the highest accuracy 0 05 FS of conventional scanners The calibration manifold may also be used to execute a simple on line re zero of the sensors This process requires the manifold to be switched to the Calibrate position while exposing the CAL port and the CAL REF port to the same pressure typically atmosphere and acquiring the sensor analog outputs at this condition This allows a new zero term to be established and eliminates both zero drift and thermal zero shift errors Page 11 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Chapter 4 4 0 DTC Series Scanner Description The Digital Temperature Compensation DTC Series of ESP Pressure Scanners incorporates many advanced features to increase the utility of the scanners while providing temperature compensation of the silicon sensors DTC Series scanner capabilities are used by the DTC Initium and the System 84
4. 75 C These equations as well as the corresponding RTD voltages are provided to customers in a calibration report along with the scanner TEMPERATURE IN CELSIUS 195 150 100 50 0 50 100 150 200 250 RESISTANCE IN OF 75 F VALUE 300 200 100 0 100 200 300 400 500 TEMPERATURE IN FAHRENHEIT Figure 5 2 Resistance vs Temperature Curve Page 19 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 5 3 Pneumatic Connections Pneumatic connections to the ESP scanners are made via user specified 0 040 or 0 063 OD bulged stainless steel tubulations installed on the scanner tubing plate Tubulations of 0 040 OD can optionally be installed at a 60 angle to minimize the overall height of the scanner Scanners specified with Purge option must be installed at the standard 90 angle unless the Quick Disconnect option is also specified Flexible tubing is installed over the bulged tubulation and secured using retaining springs Pressure Systems offers nylon tubing retaining springs and tubing pliers to facilitate the installation of the tubing and springs 5 4 Quick Disconnect Option The Quick Disconnect option enables users to easily disconnect the tubing plate from the ESP scanner without compromising manifold integrity by exposing the internal calibration manifold to potential contaminants Separating the tubing plate from the scanner helps reduce setup times by allowing tubing co
5. PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 4 1 DTC Series ESP Scanners Calibration While piezoresistive silicon pressure sensors offer high reliability with ultra miniature size the sensors are sensitive to temperature and must be compensated for thermal effects The uncompensated thermal offset shift may exceed 0 1 FS C and when using constant voltage excitation the uncompensated thermal span shift is about 0 24 FS C With DTC Series scanners repeatable thermal effects are characterized to allow digital correction of offset span and linearity over the scanner s operating temperature range Initially a single sensor was used to measure the scanner s temperature However thermal gradients between it and each pressure sensor limited the achievable performance By using pseudo constant current excitation individual temperature signals can be derived from each pressure sensor The excitation and A D zero reference are also measured to operate in a zero corrected ratiometric mode Pr Cp C a CG t F C4 Ca Ce 00 Where Dr raw pressure ratio l raw lemperature ratio Cp raw pressure measurement C raw temperature measuremeni os raw excitation measurement Cz raw zero reference measuremeni The temperature signal derived from each sensors bridge resistance is also affected by pressure To compute calibration coefficients which can be used at constant temperature thi
6. This is done to loosen the O rings from the calibration manifold Lift the tubing plate straight up Using your index finger shift the calibration manifold back and forth several times to loosen its connection with the carrier O rings Carefully lift the scanner housing with one hand and turn it over allowing the calibration manifold fall into the free hand It is imperative that the calibration manifold does not fall onto a hard surface since scratches on the manifold could result in pneumatic leaks Using the air supply apply about 30 psi 200 kPa to the small holes that can be seen centered on the edge above the calibration manifold pistons This should result in the pistons popping out of their cavity If the pistons stick apply a slightly higher pressure Place your free hand over the scanner to prevent the pistons from popping out of the scanner housing Remove the piston O rings from their slot and remove the old O ring from each piston With clean hands apply a small amount of Krytox grease PSI PN 41 06 KRYX to the palm of one hand and spread it evenly with your index finger Place one new O ring onto your greased palm Work the O ring around until it is evenly greased The O ring should shine when properly greased There should be no white areas of excess grease on the O ring Replace the greased O ring on the piston and repeat for the other piston O ring if necessary An alternate method of applying Krytox grease to O rings
7. consists of 16 piezoresistive sensors and two 2 multiplexers bonded to a hybrid substrate encapsulated in a rectangular housing The silicon pressure sensors have a micro machined diaphragm onto which four 4 piezoresistors have been diffused The piezoresistors are connected in a Wheatstone bridge configuration that generates a voltage output proportional to the pressure input This configuration exhibits low hysteresis and excellent repeatability Each sensor has a nominal full scale output of 75 mV for pressure greater that 10 psid and 20 to 75 mV for pressures less than 10 psid The carrier design see Figure 2 1 incorporates O ring pressure seals for measurement calibration and reference inputs and is mounted to the scanner with two 2 Allen head screws This design allows for easy O ring replacement without the need for special skills or tools See Chapter 6 Repair and Maintenance Carrier O Ring N Silicon Pressure Sensor Mounting NG Screws Carrier Cover plate Electrical Connection Pad Electronic l Multiplexer Figure 2 1 Transducer Carrier Exploded View Page 3 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 2 1 Scanner Description ESP pressure scanners offer many advantages due to the unigue features inherent in their design Attributes such as individual sensor thermal compensation and automatically switched reference pressures greatly enhance performance benef
8. gain proportional with temperature Using these techniques both zero and span shifts with temperature inherent in silicon pressure sensors are dramatically reduced Conventional ESP scanners require a multipoint on line calibration prior to use as described in Section 3 2 Conventional ESP Scanner Calibration to correct for sensor offset span and non linearity when calculating pressure measurements in engineering units Regular on line rezero and or span calibrations throughout a test maximizes scanner accuracy in changing temperature environments and over lengthy test durations An optional temperature sense output as described in Section 5 2 Temperature Sense Option can be added to indicate internal scanner temperature When used with calibration data taken of the scanner at various temperature intervals digital temperature correction can be employed using microcomputer intelligence The temperature sense option is also supported by a number of third party systems Refer to Appendix A for Conventional ESP specification drawings Page 8 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 3 1 Electrical Description Electrical interfacing to conventional ESP Pressure Scanners is relatively simple and straightforward All electrical inputs and outputs are brought out on connector 41 Refer to Table 3 1 and Figure 3 2 for connector J1 pinouts for ESP 16HD and connector pin locations Refer to Table 3 2 and Figur
9. ratio to the corrected temperature ratio In a similar way thermal calibration coefficients are computed using another least squares surface fit of raw pressure and corrected temperature ratio to the applied pressure Once these coefficients are determined during manufacturing they are stored within the scanner s non volatile memory Two additional coefficients can be determined with a single 2 point pneumatic calibration These coefficients provide real time offset and span adjustment P S P Z Where S span adjustment zero adjustment N DTC Series scanners may also be used as conventional scanners Note however they must be calibrated in the same manner as conventional scanners See Section 3 2 Conventional ESP Scanner Calibration Page 16 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual AO Chapter 5 5 0 Purge Option The purge option involves a modification to the scanner s calibration manifold to connect purge pressure inputs to the measurement ports during calibration Anytime the manifold is placed in the calibrate position purge pressure applied to the purge ports will purge the measurement lines of any contamination such as moisture This option enables simultaneous purging and calibration or rezero which is especially useful in flight test applications The purge option is also useful for preventing model surface pressure taps from becoming clogged during the applicat
10. that leads to the sensor An alternate method of applying Krytox grease to O rings is to place a small amount of grease in a small clean plastic bag and spread it around knead it Then place the O rings Note in need of grease in the bag and knead it some more This will effectively lubricate the rings keep them free of contaminants and provide a good storage container all without getting excessive grease on your skin 7 Repeat steps 5 and 6 for each O ring in need of replacement 8 Examine the transducer carrier to verify there are no contaminants on the O ring side Magnification would be helpful Look for defective O rings e g ones that are not round and shiny Replace the carrier by slowly placing the new carrier on the guide pins Ensure that the O ring side is down toward the pneumatic calibration manifold and the connector plate is toward the scanner s electrical connector and amplifier case 9 Replace the Allen head screws on the carrier Tighten evenly making sure that the screws are only finger tight plus Ya turn Do the same for the other carrier that was loosened It is important not to over tighten the screws since the pneumatic seal is made using dynamic O rings 10 Place the scanner with the electrical connector and amplifier case end facing up with the tubing plate facing toward you Replace the amplifier case on the scanner by carefully placing it on the guide pins Note the bottom of the case utilizes
11. the anti static wrist strap The ESD mat and strap will be used again during the assembly process Remove the tubing plate a For 16HD and 32HD scanners use an Allen wrench PSI PN 38 01 08 050 for ESP 16HD or PSI PN 38 01 08 0564 for ESP 32HD to remove the top plate retaining screws b For 64HD scanners use the Allen wrench PSI PN 38 01 08 0564 to loosen the retaining screws for the upper two carriers abutting the tubing plate and remove the top plate retaining screws Place the screws in a Ziploc bag and the slide bar and carrier assembly in a plastic container Use a razor blade to trim the wooden stick of a cotton swab to a point to assist with the removal of the tubing plate o rings Remove all o rings from the tubing plate and place them in a Ziploc bag Clean all surfaces of the tubing plate Use a cotton swab to clean the grease from all surfaces including the o ring pockets Remove the damaged tubulation If there is sufficient free area on the damaged tubulation heat the tubulation with the soldering iron and grasp the tube and twist while pulling firmly If the tubulation breaks the remainder of the tube must be drilled out Use the nose of the pliers to carefully flatten any raised portion of the tubulation Affix the appropriate drill bit see the reference card included in the kit in the pin vice PSI PN 38 01 09 01 Drill the remainder of the broken tubulation and old adhesive from th
12. 00 SDI scanner digitizer interface An onboard EEPROM stores the thermal calibration data for each channel Also stored in the EEPROM is information identifying the range of the scanner the number of channels the model number the serial number the date of manufacturer the date of calibration and the model and serial number of the calibration unit used to calibrate the scanner This data is serially transmitted to a data acquisition system such as the DTC Initium or to the Scanner Digitizer Interface SDI of the System 8400 using the ESP address lines and then transferred to the 8400 System Processor via fiber optic cable Using a proprietary PSI developed method the temperature of each sensor within the scanner is measured and transmitted along with the raw pressure measurements to the data acquisition system Utilizing the calibration data within the EEPROM the data acquisition system compensates for temperature changes to the sensors in real time This reduces thermal errors by a factor of 20 thereby reducing on line calibration requirements by up to 90 In addition only zero and span calibration is required to provide accuracy better than 0 03 FS immediately after calibration The ESP scanners also incorporate a Hall Effect sensor which is used to indicate the position of the calibration manifold This position information can be transferred to the system upon command Another advanced feature is the ability to derange the ESP scann
13. 1 3511 Sealant for tubing to tubulations 2 oz Page 35 www PressureSystems com Headguarters Factory Pressure Systems Inc 34 Research Drive Hampton VA 23666 USA Phone 757 865 1243 Toll Free 800 328 3665 Fax 757 865 8744 E mail sales PressureSystems com
14. GAN Ba AE a a aa Ba A Aa Na 15 Chapter IA Ia 17 50 PUGS PU AA 17 Sa Healer Enamora 16 5 2 Temperature Sense Option cuina ds 19 BS FPneumaticSONNecioAS caia 20 34 lt QUIGK DISGONMEGCE ODTOMN utente dae Da ja aaa AN 20 UA AN AA Kadi a a aa KA AA 21 6 0 Repair and Maintenance ccc ccc aee eee XA 21 6 1 O Ring Replacement ProCedures occccccccocccccnccocncconccncnnconnnnnnonononnnnnnannonnnonanonaninnanenoss 21 6 1 1 Tubing Plate O Ring lt 6 2140610611 21 6 1 2 Transducer Carrier O Ring Replacement ccoocccccnccccccccnccocnnccnncncnnnanocanonanncnanonos 22 61 3 Piston O Ring Replacement ii a gana aka a aa a a akan 24 6 2 Tubulation Replacement Procedure naen eaaa eaaa aaa 25 ADD NTIK A iaa 26 ESP 16HAD Speciicat n DEAWING EA 28 ESP 92HAD Speciicaton Drawing oie abia 29 ESr O4FID Speciiicatlonm DraWiNg sastre trono evil eiii sido calce leo 30 ADON DUBAI 31 ESP ISAD Heater Chambe ia AA Ai 31 Conventional ESP 32HD Heater Chamber coocccccccccccococociconoconcocnconnnocnnnononcnonnnoncnnnrocnnononinanes 31 Conventional ESP 64HD Heater Chamber Aa 32 DTC Series ESP 32HD Heater Chamber asasaran aaa aaa aa a aji Ba ga a ga Da E aa ana aa a aaa TE A GAN 33 DTC Series ESP 64HD Heater Chamber AA 33 AU iras 34 Spare Pais ii 34 Miscellaneous Pa i
15. al Ao Digital Address 12 VDC Supply Voltage A Digital Address NS Vs Sensor Supply Voltage 5 VDC 2 Vs Sensor Supply Voltage RTN Co a 11 va Pressure Voltage Output 6 avpe Supply Voltage __ Table 3 1 ESP 16HD Connector J1 Pinout PIN NUMBERS LOOKING INTO CASE Figure 3 2 ESP 16HD Connector Pin Locations 6 2vDc Supply Voltage a V Sensor Supply Voltage 5 VDC ES Vs Sensor Supply Voltage RTN 14 We Wa Se nse GND Figure 3 3 Conventional ESP 32HD and ESP 64HD Connector Pin Locations Page 10 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 3 2 Conventional ESP Scanner Calibration The accuracy of the ESP scanner is maintained through periodic on line calibrations A calibration consists of pneumatically switching the scanner calibration manifold into the calibrate position and then applying multiple calibration pressures while monitoring the electrical response of each sensor within the scanner The calibration data for each of the sensors may be reduced into offset sensitivity and non linearity coefficients that are used to calculate unknown pressures The following fourth order polynomial resulting from a five point calibration is used to calculate pressure during data acguisition Py Co Cy Vx Co v C3 v Cy Vv Where Py pressure to be measured Co offset psi Cy sensitivity psi volt Co non linearity psi volt
16. arious configurations without changing to scanners of another pressure range A second multiplexed analog line outputs temperature sense excitation sense and calibration manifold position signals as well as being used to output memory data The six 6 digital address lines select one of the scanner s pressure sensors to be present on the voltage output line Vo Address lines Ay and As also support a two wire serial bus to access the EEPROM select gain or select the second multiplexed analog output gt je O Va Pressure Output gt Vt Temperature Output 15 Vp Manifold Position Vs Excitation Sense 1 H Two Wire Bus za 908 Valve Position Sensor Memory Data Pressure Sensors es A CC Eo a A CTIS a AN Ca Go AAA il D Ag Reference 6 HEFTE WID gy 9 N A Lew Me GND Figure 4 1 Electrical Diagram for DTC Series ESP Scanners Page 13 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Ao Digital Address 6 12 VDC Supply Voltage Vo Voltage Output A Digital Address 12 VDC Supply Voltage As Digital Address A Digital Address US N A Not Used Vo GND As Digital Address KI V Sensor Supply Voltage RTN 14 N A Not Used As Digital Address 10 enn 15 Muxed Output Vi Ve Vo Table 2 2 DTC Series ESP 32HD and ESP 64HD Connector J1 Pinout Figure 2 4 DTC Series ESP 32HD and ESP 64HD Connector Pin Locations Page 14 www
17. canners Note Items below are included in the maintenance kit along with spare screws and necessary hand tools O Rings and Grease 61 02 3023 Pressure Ports C1 C2 Control Ports ESP 16HD 61 03 40370 61 02 3143 61 02 3023 61 02 3023 C1 C2 Control Ports ESP 32HD 61 03 40370 61 02 4762 61 02 3023 61 02 3023 C1 C2 Control Ports ESP 64HD 61 03 46450 61 02 3143 41 06 KRYX Krytox GPL 206 grease Tubulation and Adhesive 27 07 B3005 0 040 OD x 300 L SS Bulged Tubulation Far orss0s 0 04000 3801 S6 BugedTubueion 00 UU laroosssos B065 0D asar S6 Bled Tubaaion 7 Jar 6555058 0 06900 5801 S6 BugedTubueion 7 UU forns 0 00000 sun 15 BugedTubwaion 0 ros os opa 5801 S6 BugedTubueion 7 rocosos os opa 7507 S6 BugedTubuaion 7 cos 000 19090000099 O Page 34 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Miscellaneous Parts PSI Part Number Description Tubing and Pliers 27 02 0040 Nylon tubing for 040 OD tubulations MO 27 02 0062 Nylon tubing for 063 OD tubulations A 27 03 0125 Nylon tubing for 090 OD tubulations A 27 02 0187 Nylon tubing for 125 OD tubulations STP2 0000000000 Tubing pliers Retaining Springs 12 90 2540 Retaining springs for 040 OD tubulations DN 12 90 2562 Retaining springs for 063 OD tubulations MO 12 90 2590 Retaining springs for 090 OD tubulations io 41 0
18. dad 35 Page 1 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual PA Chapter 1 1 0 Introduction ESP Pressure Scanners are miniature electronic differential pressure measurement units consisting of an array of silicon piezoresistive pressure sensors one for each pressure port The sensors are mounted on a common hybrid glass substrate using a proprietary technique which maximizes long term stability The outputs of the sensors are electronically multiplexed through a single onboard instrumentation amplifier at rates up to 50 000 Hz using binary addressing The multiplexed amplified analog output is capable of driving long lengths of cable to a remote A D converter The ESP scanners also incorporate a two position calibration manifold actuated by momentary pulses of control pressures When placed in the calibrate position all sensors are connected to a common calibration pressure port A series of accurately measured pressures can be applied through this port to characterize the sensors in place at the condition to which they are being subjected Proper and periodic on line calibration maintains static errors within 0 03 or better of the full scale FS pressure range The calibration manifold automatically switches between two common reference pressures to ensure a stable reference is applied during calibration The calibration manifold incorporates a visual position indicator and utilizes a dynamic o rin
19. e electrostatic discharge 6 1 O Ring Replacement Procedures The following tools are necessary for O ring replacement e One 0 Phillips head screwdriver PSI PN 38 0 1 07 0 e One 5 64 Allen head screwdriver PSI PN 38 0 1 08 0564 e One needle nose tweezers The components needed for O ring replacement are included in ESP maintenance kit PSI PN ESP MK or may be ordered separately Needed for these procedures are O rings two sizes a fast evaporating cleaning fluid i e acetone alcohol Freon etc 50 psi dry air supply and Krytox fluorinated grease PSI PN 41 06 KRYX Thoroughly read product recommendations and warnings PSI recommends using cotton tipped lint free applicators to apply cleaning fluid 6 1 1 Tubing Plate O Ring Replacement 1 Using the Allen head screwdriver PSI PN 38 01 08 0564 loosen the two screws one half turn on all carriers Do not loosen these screws more than one half turn Use an Allen wrench PSI PN 38 01 08 050 for ESP 16HD or PSI PN 38 01 08 0564 for ESP 32HD and ESP 64HD to remove the four Allen head screws that secure the tubing plate onto the scanner Carefully slide the tubing plate back and forth about 4 of an inch several times This is done to loosen the O rings from the calibration manifold Lift the tubing plate straight up 2 Remove the O rings from the tubing plate that are in need of replacement using the needle nose tweezers Clean the O ring cup with an applicator m
20. e 3 3 for connector J1 pinouts for ESP 32HD and ESP 64HD A 12 VDC and a 5 VDC supply are required to power the scanner The 5 VDC supply is the voltage between V and V for sensor bridge excitation and must be regulated at or near the scanners to within 0 02 The digital addresses A As determine which sensor output will be present on the voltage output line Vo They should be open collector buffered to drive long interface cables The digital address lines are 12 VDC logic Logic O is s 3 VDC logic 1 is 2 8 VDC At a maximum distance of 30 feet from the scanner the open collector address lines must be tied to the CMOS levels before being input into the scanner The A D converter should be at least 12 bits resolution Connector J1 should be connected with the proper signals on the appropriate pins before applying power to the scanner After addressing the desired sensor no less than 50 microseconds should be allowed for the multiplexers and amplifier to settle before acquiring data The ESP 16HD uses A A the ESP 32HD uses A A and the ESP 64 uses Ao As Temp Sense Option Multipleker if Multiplexer 1 2 N 8 Vo VRT Vo VoRTN Vo VoRTNI AAi A UN 1 4 1 KG er decoder Instumentation Amplifier 12 WDC Figure 3 1 Electrical Diagram for Conventional ESP Scanners Page 9 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manu
21. e tubulation pocket Ensure that the pin vice and drill bit are angled correctly Stop and examine the work frequently to ensure that the drill does not penetrate further than the original tubulation pocket Page 26 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 13 14 15 16 17 18 19 20 21 Use the appropriate drill bit see the reference card included in the kit to ensure that the through hole to the o ring pocket is clear Turn the tubing plate o ring side up Locate the o ring pocket of the port of interest and blow compressed air through to remove debris Insert the drill bit into the through hole and gently remove any obstructions Do not damage the o ring sealing surface within the o ring pocket Do not drill through the tubing plate Clean the tubing plate tubulation and o ring pockets Clean the work surface Select a replacement tubulation from the ESP maintenance kit see the reference card included in the kit Test fit the tubulation to ensure correct height The tube should be angled correctly Use the Loctite adhesive PSI PN 41 09 68005 to affix the new tubulation to the tubing plate Trim the wooden stick of a cotton swap at an angel for use as an adhesive applicator Place several drops of adhesive on a small plate Examine the end of the tubulation which will be placed in the pocket The adhesive will be placed as close as possible to the end of the tubu
22. er upon command This alters the gain on the amplifier to derange the scanner by a factor of three enabling additional windtunnel tests to be conducted without re instrumenting the model with lower range ESP scanners In order to maximize the performance of the scanners in the deranged mode the DTC Series ESP scanners should be factory calibrated for dual range operation DTC Series ESP scanners are slightly longer than conventional scanners to accommodate the additional electronics in the amplifier assembly The DTC scanners now use PSI s Gen 2 amplifier design providing the ultimate in performance requiring only a 20 microsecond settling time between channel addresses providing scan rates of 50 000 channels per second Refer to Appendix A for DTC Series ESP specification drawings Page 12 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 4 1 Electrical Description Although DTC Series ESP scanners contain additional functionality compatibility with conventional ESP scanners has been maintained A block diagram of the DTC scanner is depicted in Figure 4 1 The sensor s excitation is internally derived from the 12 VDC power to improve regulation and to eliminate the need for another externally regulated supply The scanner s calibration coefficients are stored in a 64K bit serial EEPROM The dual gain amplifier in conjunction with the optional dual range calibration allows a windtunnel model to be tested in v
23. g seal design for high reliability and easy servicing in the field Options include purge capability isolated from the pressure sensors to clear measurement lines of moisture and contamination as well as to prevent closure of model pressure taps during application of pressure sensitive paint Other options include a nickel foil RTD output to monitor internal scanner temperature and Digital Temperature Compensation technology now incorporating PSI s Gen 2 amplifier technology The Digital Temperature Compensation DTC option incorporates the latest PSI innovations in ESP technology including temperature signal outputs from each silicon pressure sensor embedded EEPROM retaining factory calibration information including temperature characteristics programmable dual gain amplifier with optional dual range calibration calibration manifold position sensing and internal sensor excitation regulation with sense output DTC Series ESP scanners are supported by PSI s DTC Initium System and the SDI configuration of the System 8400 to dramatically reduce calibration requirements This User s Manual will e Describe each of the ESP Pressure Scanners produced by Pressure Systems Inc e Provide step by step instructions for field repair of the ESP Pressure Scanners Page 2 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Chapter 2 2 0 Transducer Carrier Description The transducer carrier used on ESP scanners
24. ide Magnification would be helpful Replace the tubing plate by carefully placing it onto the calibration manifold Make sure the O ring side is down toward the pneumatic sliding manifold and the guide pins fit into the groves of the scanner s amplifier case Replace the Allen head screws on the tubing plate Also tighten the screws on the carriers that were loosened Tighten evenly making sure the screws are only finger tight plus turn It is important not to over tighten the screws since the pneumatic seal is made using dynamic O rings 6 1 2 Transducer Carrier O Ring Replacement 1 Place the scanner on its end with the electrical connector and amplifier case facing up and the tubing plate facing toward you Please follow the guidelines of electrical care and cleanliness as described above Using the 0 Phillips head screwdriver PSI PN 38 01 07 0 remove the two screws that hold the amplifier case to the scanner Lift the amplifier case off the guide pins Orient the scanner so that the carrier on which the O rings you wish to replace are facing up and toward you For example if you need to replace the O ring for channel 1 place the scanner on its side with the electrical connector and amplifier case facing left and the tubing plate toward you Use an Allen wrench PSI PN 38 01 08 0564 to remove the two Allen head screws on the carrier Loosen the screws one turn on the other carrier that is located on the side on which you a
25. ig 700 kPa dry air or nitrogen to the C1 control port switches the internal calibration manifold to the Calibrate position With the manifold in this position all sensors are manifolded to two common ports one CAL and one CAL REF The CAL port is manifolded to the input or run side of the sensors and the CAL REF port is manifolded to the reference side of the sensors By applying calibration pressure s to the CAL port all sensors can be calibrated in the environment to which they are subjected CAL REF is used to input atmospheric reference or another stable pressure during calibration After calibration the manifold may be switched to the Run position by applying 100 psig 700 kPa to the C2 control port pressure on C1 must be vented In this position each sensor is pneumatically connected to its associated input port A manifold position indicator pin located in the center of the tubing plate clearly shows the position of the internal calibration manifold The RUN REF port is the reference pressure input when in the Run position and is manifolded internally to the reference of each of the sensors within the scanner The RUN REF port is typically connected to tunnel static pressure atmosphere vacuum etc but care should be taken that only dry gas or vacuum is attached to this port An input port diagram is shown in Figure 2 7 Refer to this diagram when connecting tubing to the scanner To understand the operation of the internal manifo
26. ion of pressure sensitive paint Purge pressure must be present whenever the manifold is shifted to the calibrate position to prevent reverse purge from occurring CAL PURGE POSITION PRESSURE SENSOR PRESSURE SENSOR RUN PISTON TO NEXT SENSOR TO NEXT SENSOR The purge option allows the ESP input pressure lines to be purged of contaminants Purge pressure is input to the scanner via bulged purge tubulations The ESP 64HD utilizes four 0 090 OD 0 063 OD for the angled DC option purge tubulations whereas the ESP 32HD and the ESP 16HD both only utilize one of 0 125 OD and 0 063 OD respectively The purge pressure is isolated from the sensors thereby eliminating possible damage due to overpressure This option can be ordered as a factory installed option or a user installed kit VAL CALIBRATION CHANNELS su NPUT CHANNELS PISTON y TRANSDUCER Figure 5 1 Purge Mode Diagram Page 17 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 5 1 Heater Chambers ESP Heater Chambers are designed to maintain the scanner at operating temperatures within 25 to 80 C The heater chamber is constructed of Delrin material an acetate resin that is both lightweight and a good insulator Heater chambers are available for the ESP 16HD 32HD and 64HD pressure scanners Refer to Appendix B for all heater chamber specification drawings The heater chamber electr
27. ions Support Group at Pressure Systems The staff is available for troubleshooting at 757 865 1243 or toll free at 1 800 678 7226 SCAN during normal working hours Eastern time If the entire system or any part must be returned to Pressure Systems please obtain a Returned Merchandise Authorization RMA from the Customer Service Department Be prepared to supply the following information when requesting the RMA Part number Serial number Complete description of problems symptoms Bill To and Ship To address Evaluation repair purchase order number not required for warranty repairs Customer contact and telephone number The above information including the RMA number must be on the customer s shipping documents that accompany the equipment to be repaired Pressure Systems also requests that the outside of the shipping container be labeled with the RMA number to assist in tracking the repairs All equipment should be sent to the following address ATTN CUSTOMER SERVICE 7 digit RMA number Pressure Systems Inc 34 Research Drive Hampton Virginia 23666 Pressure Systems will return North American warranty items prepaid via UPS GROUND Overseas warranty items will be returned via AIR FREIGHT If the customer desires another method of return shipment Pressure Systems will prepay and add the shipping charges to the repair bill Incoming freight charges are the customer s responsibility The customer is also responsible for paying shippi
28. is to place a small amount of grease in a small clean plastic LE bag and spread it around knead it Then place the O rings Note in need of grease in the bag and knead it some more This will effectively lubricate the rings keep them free of contaminants and provide a good storage container all without getting excessive grease on your skin Clean the piston cavity with a cleaning fluid such as acetone alcohol Freon read all manufacturer s warnings thoroughly or any other substance that evaporates quickly and leaves very little residue Replace each piston into its cavity by placing the O ring side of the piston in first and then pressing the piston completely into its cavity with one finger Page 24 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 7 Refer to Section 6 1 2 Transducer Carrier O Ring Replacement if replacement of all carrier O rings is desired 8 Clean and lightly grease the calibration manifold being very careful not to get grease in the openings in the manifold Replace the calibration manifold into the scanner For ESP 16HD and ESP 32HD scanners there are guide pins to prevent improper replacement For the ESP 64HD there are no guide pins However correct replacement may be assured by making sure that the side of the calibration manifold without holes is down that the manifold position indicator is pointing up and that the CAL hole on the manifold is closest to the scan
29. itting the windtunnel and flight test industry while the modular design facilitates serviceability in the field Figures 2 2 through 2 4 are exploded views of the ESP 16HD ESP 32HD and ESP 64HD scanners Please refer to these drawings to understand the construction of the pressure scanners Tubing Plate Tubing Plate O Ring Piston O Ring 2 Places Calibration Manifold Cal Case Carrier Amp O Ring Case Electrical Connector Transducer Carrier Carrier Electrical Cover plate Connection Pad Figure 2 2 ESP 16HD Exploded View Page 4 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Tubing Plate O Ring Calibration Piston Manifold O Ring 2 Places Cal Case Electrical Connector Transducer Carrier Amp Case Carrier O Ring Electrical Connection pad s Cover Plate Figure 2 3 ESP 32HD Exploded View Tubing Plate O Ring f Carrier O Ring a Calibration Manifold Electrical Connector Piston O Ring 2 Places Amp Case Pa Ka Sy ai Carrier So Sa Cover Plate Na Transducer Carrier Electrical Connection Pad Figure 2 4 ESP 64HD Exploded View Page 5 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 2 2 Pneumatic Description All ESP scanners reguire a minimum Of three pneumatic inputs for operation two control pressures C1 and C2 and a calibration pressure Applying 100 ps
30. lation without extending over the lip Dip the trimmed applicator in the adhesive and place a thin bead around the circumference of the tubulation close the lip Insert the tubulation in the pocket and twist slightly to distribute the adhesive Place the tubing plate in a clean location and allow curing for 24 hours Once the adhesive has cured inspect the tubing plate to make sure that the adhesive has not obstructed the through hole Gently use the 74 drill bit to clean the through hole if obstructed Install the top plate o rings Affix the tubing plate to the scanner Screws should be finger tight Ya turn a For 64HD scanners tighten retaining screws for the two carriers abutting the tubing plate Place the scanner on the ESD mat Put on the wrist strap Attach the amplifier case to the scanner Perform a leak test and accuracy test to verify correct operation of the scanner Page 27 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Appendix A ESP 16HD Specification Drawing 11060 Hgo 626 2 56 x 150 DEEP 100 2 PLACES length mm hem incl tubes tubes in mm in mm 127 111 Umm 0 5 az 21 107 2741 112 284 112 284 5 85 21 6 050 127 oss 216 112 0 063 OD straight 0 040 OD straight purge 2 70 ILUOIJUJAUO 0 063 0D straight purge Page 28 www PressureSystems com Pressure Syste
31. ld refer to the calibration manifold diagram shown in Figure 2 6 Over pressuring the scanner on the inputs CAL or REF ports can ME Note cause damage to the scanner Check then recheck all pneumatic connections before applying pressure 09 O O O O O O O O O O 09 O Calibration Manifold Indicator Figure 2 5 Input Port Diagram Page 6 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual RUN Position CAL Position Figure 2 6 Calibration Manifold Diagram Page 7 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual AA Chapter 3 3 0 Conventional ESP Scanner Description Conventional ESP Pressure Scanners represent PSI s second generation of miniature ESP scanners These HD style ESP scanners are all built upon the 16 channel transducer carrier described in Section 2 0 Transducer Carrier Description Conventional HD style ESP scanners offer many advantages over their predecessors such as individual sensor thermal compensation modular construction and automatically switched reference pressures that greatly enhance performance while easing user considerations and facilitating service in the field Individual sensor thermal compensation is accomplished by adding a precision resistor network to the sensor s Wheatstone bridge to reduce sensor offset and thermal zero shifts Thermal span shifts are reduced using a thermistor to alter the amplifiers
32. measurement o SPECIALTIES PRESSURE SYSTEMS O ESP Pressure Scanner User s Manual August 2009 Www PressureS5ystems com Our Publication Disclaimer This document is thoroughly edited and is believed to be thoroughly reliable Pressure Systems assumes no liability for inaccuracies All computer programs supplied with your products are written and tested on available systems at the factory Pressure Systems assumes no responsibility for other computers languages or operating systems Pressure Systems reserves the right to change the specifications without notice Our Company Pressure Systems develops manufactures and services level and pressure measuring instruments where the highest level of traceable accuracy is required for aerospace industrial municipal and environmental applications Our products have become the world standard for electronic level and pressure measurement and scanning We are committed to the highest quality design manufacture and support of level and pressure instrumentation that is in the best interest of our customers Pressure Systems is an ISO9001 2000 certified company Our Warranty Pressure Systems warrants this ESP Pressure Scanner product to be free of defects in material and workmanship under normal use and service for one 1 year from date of shipment Merchandise Return Procedures If your system seems to be in good working order but the data seem abnormal contact the Applicat
33. ms Inc ESP Pressure Scanner User s Manual ESP 32HD Specification Drawing ILUOIJUJAUO s31195 ILOG gE 53 Si TO O O RF OO O OM O CODR PURGEC CALO C2 1 72500 0606 000 OF s1 ee NO 10000 C 000 Di 1000 REF OOO 08 _ SS I Tenane kU malas 5 iau NGANG 7 400 2 56 x 150 3 8mm 00 086 2 54mm 4 places 2 18mm teh mam ores 0 040 OD angled 0 063 OD straight 0 040 OD straight QDC 0 040 OD angled QDC 0 040 OD angled 0 040 OD straight ADC 0 063 OD straight QDC 34 7 Page 29 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual ESP 64HD Specification Drawing 1295 3 18mm Y NO 256 x 150 3 8mm dp 150 4 places mi 150 3 81mm 3 81mm length width tubes tubes Cin mm in mm in mm in mm 254 123 1 19 1 55 0 040 OD angled ADC 0 040 OD angled ADC purge JEUOIJUBSAUOD 1 30 s31135 JLA Page 30 www PressureSystems com ESP Pressure Scanner Users Manual Pressure Systems Inc E Appendix B ESP 16HD Heater Chamber 1 100 27 94mm Ss tr O QS fa 9 Z 5s 4 050 102 87MM O 134 3 40mm 2 places RED 8 BLACK LEADS HH hta 51 44mm 450 typ 0 38 Sig 11 43mm 4 650 118 11MM Conventional ESP 32HD Heater Chamber gt EE ei 1 700 43 18mm m
34. ner electrical connector Further verify that the two holes near the short edge end of the top surface are toward the amplifier case The orientation of the calibration manifold is critical and it is possible to assemble the scanner with the manifold oriented incorrectly 9 Examine the tubing plate to verify that no contaminants are on the O ring side Magnification would be helpful Replace the tubing plate by carefully placing it onto the calibration manifold Make sure the O ring side is down toward the pneumatic sliding manifold and the guide pins fit into the groves of the scanner s amplifier case 10 Replace the Allen head screws on the tubing plate Also tighten the screws on the carriers that were loosened Tighten evenly making sure the screws are only finger tight plus turn It is important not to over tighten the screws since the pneumatic seal is made using dynamic O rings 11 Place the scanner on its end with the electrical connector and amplifier case facing up and the tubing plate facing toward you Fasten the two Phillips head screws that hold the amplifier case to the scanner by firmly and evenly holding the case down with one hand while evenly tightening the screws with the other hand When fastening the amplifier case take care not to let the case itself hit the connection pads on the transducer carrier Fasten the screws finger tight plus Ya turn 12 Exercise the calibration manifold a few times by applying 100 to 120 p
35. ng charges to and from the Pressure Systems factory for any equipment not under warranty All products covered under warranty policy will be repaired at no charge An analysis fee will be charged to quote the cost of repairing any item not under warranty If for any reason the customer decides not to have the item repaired the analysis fee will still be charged If the quote is approved by the customer the analysis fee will be waived The quote for repair will be based on the factory s flat rate for repair calibration and board replacement When these prices do not apply the quote will be based on an hourly labor rate plus parts All replaced parts are warranted for 90 days from the date of shipment The 90 day warranty is strictly limited to parts replaced during the repair Pressure Systems Inc ESP Pressure Scanner User s Manual Table of Contents GADEL TL aia AA AA AA 2 EO Ke AA a aa aaa omens 2 11212 612 AA AA WA Aa ANA a 3 2 0 Transducer Carrier Descriptio ii 3 ZA Scanner DESGCIDUOMN aaa kad aaa AINA GA Aa Ga aa ARKA SANA tes ANA KAN noses aa a a daa aa AG 4 22 PheumateDESECNpPHION aaa aga aa Aa E AEA 6 Capa AA AA AA Aha 8 3 0 Conventional ESP Scanner Description wa aka 8 Sel JEICCWICAl BR AA 9 3 2 Conventional ESP Scanner Calibration 2 XQXX aaa 11 CHA ii ANA AA AA 12 40 DTC Seres scanner Descrip 12 4d EleCiical Descrip Nana 13 4 1 DTC Series ESP Scanners Calibration sas aura akan pang ak ah aaa aa
36. nnections to be completed while simultaneously conducting electrical checkout of the scanner The Quick Disconnect option also now enables angled tubulation to be specified in conjunction with the Purge option Quick Disconnect tubing plates can be ordered as an option on new ESP scanners or as a retrofit kit for field installation Each kit comes with installation instructions and is comprised of four 4 components tubing plate receiver plate and two protective cover plates Individual components may also be ordered as replacements Refer to Appendix A for Quick Disconnect ESP specification drawings PROTECTOR PLATE RECEIVER PLATE PROTECTOR PLATE TUBING PLATE Figure 5 3 Quick Disconnect ESP Exploded View Page 20 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual AS Chapter 6 6 0 Repair and Maintenance ESP scanners are field repairable to the extent of O ring and tubulation replacement To facilitate repair of the scanners maintenance kits are available for each ESP scanner Kits include spare bulged tubulations a drill bit to clean the tubulation bore in the tubing plate and the sealant to secure the tubulation to the plate Also included are spare O rings for the transducer carrier tubing plate and pistons along with a supply of lubricant Additional O rings may be separately purchased See Appendix C Spare Parts NG All ESP scanners and transducer carriers are sensitive to Not
37. oistened with a cleaning fluid such as acetone alcohol or Freon read all manufacturer s warnings thoroughly or any other substance that evaporates quickly and leaves very little residue Remove any excess cleaner with the air supply as soon as possible 3 With clean hands apply a small amount of Krytox grease PSI PN 41 06 KRYX to the palm of one hand and spread it evenly with your index finger Place one new O ring Page 21 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual onto your greased palm Work the O ring around until it is evenly greased The O ring should shine when properly greased and there should be no white areas of excess grease on the O ring Make sure there is only a thin film of grease on the O ring Using your greased index finger place the greased O ring in the cup on the tubing plate Ensure that no grease is introduced into the hole An alternate method of applying Krytox grease to O rings is to place a small amount of grease in a small clean plastic WE bag and spread it around knead it Then place the O rings Note in need of grease in the bag and knead it some more This will effectively lubricate the rings keep them free of contaminants and provide a good storage container all without getting excessive grease on your skin Repeat steps 5 and 6 for each O ring in need of replacement Examine the tubing plate to verify that no contaminants are on the O ring s
38. one guide pin while the top is guided by two pins 11 Replace the two Phillips head screws that hold the amplifier case to the scanner by firmly and evenly holding the case down with one hand while evenly tightening the screws with the other hand When fastening the amplifier case take care not to let the case itself hit the connection pads on the transducer carrier Fasten the screws finger tight plus Ya turn 12 Verify the correct operation of the scanner Page 23 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 6 1 3 Piston O Ring Replacement 1 Place the scanner on its end with the electrical connector and amplifier case facing up and the tubing plate facing toward you Please follow the guidelines of electrical care and cleanliness as described above Using the 0 Phillips head screwdriver PSI PN 38 01 07 0 loosen the two screws two and one half turns that hold the connector and amplifier case on the scanner Do not completely unscrew these screws Using the Allen head screwdriver PSI PN 38 01 08 0564 loosen the two screws one half turn on all carriers Again do not loosen these screws more than one half turn Use an Allen wrench PSI PN 38 01 08 050 for ESP 16HD or PSI PN 38 01 08 0564 for ESP 32HD and ESP 64HD to remove the four Allen head screws that secure the tubing plate onto the scanner Carefully slide the tubing plate back and forth about 4 of an inch several times
39. onics include protection from thermal overload should internal heater chamber temperatures approach 90 C as well as potentiometer adjustment of heater chamber temperature preset at the factory to user specifications The entire electronics package including the scanner is encased in a copper liner to maintain even temperature distribution The heater chamber requires 28 VDC power to the two leads which are left unterminated for user installation A scanner cable is required to pass through the top plate of the heater chamber to connect to the scanner Table 5 1 gives the setpoint in ohms for a given desired temperature setting The following procedure can be used to adjust the heater temperature 1 Determine a setpoint temperature fitting the application 2 Connect an Ohmmeter to the two test points on the Heater Chamber 3 Adjust the potentiometer until the control setpoint value in ohms from the chart is indicated on the meter Note 1 This procedure results in a temperature setting within 3 of the desired setpoint Note 2 The heating element in the heater chamber can develop about 33 watts of power The chamber provides insulation however there are limitations for achievable regulation The Heater Chamber reduces the temperature effect to the scanner by a factor of 10 1 Note 3 It is recommended to set the Heater Chamber temperature setpoint to 5 C above the expected ambient temperature Maximum scanner temperature environment is 80
40. re working Remove the carrier by lifting straight up taking care not to bend the guide pins on the scamner Remove the O rings from the carrier that are in need of replacement using the needle nose tweezers NOTE When removing the O rings and cleaning the transducer carrier be aware that the silicon pressure sensor is located less than 1 8 of an inch from the O ring surface of the carrier Clean the O ring cup with an applicator moistened with a cleaning fluid such as acetone alcohol or Freon read all Page 22 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual manufacturer s warnings thoroughly or any other substance that evaporates guickly and leaves very little residue Remove any excess cleaner with the air supply as soon as possible Do not blow air directly into the holes on the surface since that can drive fluid into the sensor and or rupture it 6 With clean hands apply a small amount of Krytox grease PSI PN 41 06 KRYX to the palm of one hand and spread it evenly with your index finger Place one new O ring onto your greased palm Work the O ring around until it is evenly greased The O ring should shine when properly greased and there should be no white areas of excess grease on the O ring Make sure there is only a thin film of grease on the O ring Using your greased index finger place the greased O ring in the cup on the transducer carrier Ensure that no grease is introduced into the hole
41. s unwanted pressure effect must be removed to Qo Q t Ro Ri t py So Si t PA Where fe pressure corrected t Oo Oz Ro Ri So S1 calibration coefficients Page 15 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual Once this has been done the following pressure conversion coefficients are calculated from the current temperature A Ao A tc A gt to A fe B Bo B te B t C Co Ci tc D Do D tc Where A B C D coefficients for current temperature Ao Aj A Az calibration coefficients Bo Bi Ba B3 calibration coefficients Co C calibration coefficients Do DJ calibration coefficients To reduce the computational overhead these calibrated coefficients a d can be used to compute pressures until a new temperature update is required P A Bp Cp Dp Since this compensation algorithm can only correct for repeatable effects over temperature and pressure the pressure sensors are selected for low offset drift low span drift and good thermal closure hysteresis Additional temperature and pressure cycles are used to further select sensors with low pressure hysteresis low temperature hysteresis and high accuracy over temperature and pressure points within the operating range Correction coefficients to remove the unwanted pressure effect on the temperature signal are computed using a least squares surface fit of the raw temperature and pressure
42. si 700 to 850 kPa alternating between C1 and C2 13 Verify the correct operation of the scanner 6 2 Tubulation Replacement Procedure The following materials and tools are necessary for performing replacement of ESP scanner tubulations ESP Maintenance Kit PSI PN ESP Mk An ESD mat with wrist strap observe correct grounding procedures Small needle nose Pliers Cleaner such as Acetone or Ethyl Alcohol Cotton Swabs A single edged razor blade Soldering Iron with clean tip A can of compressed gas such as Dust Off Paper wipes such as Chem wipes Page 25 www PressureSystems com Pressure Systems Inc ESP Pressure Scanner User s Manual 10 11 12 e A small clean flat plate such as a jar lid or microscope slide this will be used to help apply the adhesive e A small lidded plastic container used to hold the ESP scanner while repair is being performed on the tubing plate e Two small Ziploc bags for holding screws and o rings e The Kudl Pak case for the ESP scanner used to hold the scanner amplifier case during the repair e A clean work surface Place the scanner on an ESD mat and put on the wrist strap Using the 0 Phillips head screwdriver PSI PN 38 01 07 0 remove the two screws holding the amplifier case to the scanner Place screws in a Ziploc bag Remove the amplifier case and place it in the Kudl Pak Place the scanner on a clean work surface and remove
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