Miniature Analog Pressure Scanner
MPS4164 AnalogPressure Scanner
Features• Newvalvedesignprovides"isolate-purge"• Onboardsensorexcitation• 40kHzdataoutput• Double-isolated,ultra-stablepressuresensors
• DirectlegacycompatabilitywithZOCseriesscanners
• Removableinputheaders• UpgradabletoEthernetMPS4264standard
ISO 9001:2015 CERTIFIED
General DescriptionTheMPS4164analogminiaturepressurescannerisanextremelycompact64channelpressurescanner.Ithasbeendesignedfromthegroundupwithsize,accuracyandfunctionalityinmind.EachMPS4164moduleincorporates64individualsiliconpressuresensors,calibrationvalving,ahigh-speedmultiplexer(45kHz)andaninstrumentationamplifiter.Simply,itacceptsupto64individualpneumaticpressureinputsandconvertsthemtohighlevelelectronicsignals.Itboastsasmallfootprint,aruggedisolate-purgecalibrationvalve,extremelystableandrepeatablepressuresensorsandawealthofotherinnovativefeatures.TheMPS4164isdesignedaroundacoresensorpackthatusesacustompackaged,ultra-stablesensor.Scanivalveengineersevaluatedknowncausesofnon-repeatabilityinpiezoresistivepressuretransducers.Designingadoubleisolationmethodofbondingthesensorstothebasesubstrates(patentpending)minimizesthemechanicalinfluencesofassemblyandthermalexpansion.Thisprocessdramaticallyimprovesthestabilityandtheresultingaccuracyofthesensors.Abrandnewvalvehasbeendesignedthatfullyisolatesthesensorsfrompurgepressureandprovideslongterm,maintenancefreeoperation.Notonlyisthevalvedesignanimprovementoverlegacyproducts,buttwodifferentvalveactuationoptionsareavailable.The"standard"(CPx)actuationusesopposing65psicontrolpressures
toshiftthevalveintowhicheverstateisdesired.Thenew"NormalPx"(NPx)optionusesaspringtodefaultthevalveintomeasurementmodeand120psitoshiftitintocalibratemode.
Model MPS4164
ApplicationsTheMPS4164electronicpressurescanningmod-uleisspecificallydesignedforuseinwindtun-nelandflighttestswhereoperationalconditionsareveryspaceconstrainedandpressuresdonotexceed50psi.Itisidealforuseinsidesmallsuper-sonicwindtunnelmodels.Theverylowpressurerangesofferedandsmallsizealsomakeitanidealfitforwindengineeringapplicationswherethemeasurementpressuresareverylow.Inhighchannelcountsystems,thelowercost-perchannelmakesitanaffordablesolution.Itmaybemountedinanypositionsothepressuresensorsmaybeclosecoupledtothepressuresourcestobemeasured.Removableheadersallowforeasyinstallationandremovalwithoutbreakingthepneumaticlines.TheMPS4164moduleisdesignedtobeusedinconjunctionwithScanivalvemodelERAD4000Re-moteA/DormodelDSM4000DigitalServiceMod-ule.EachMPS4164pressurescannerincorporatesanembeddedRTDtomonitorthetemperatureofthepressuresensors.TheERAD4000communi-catesviaEthernet.TheDSM4000communicatesviaEthernet,RS-232,orARINC429.
Legacy CompatibilityTheMPS4164wasdesignedspecificallytoreplacethelegacyZOCseriesofpressurescanners.ThisMPScandirectlyreplaceaZOC3364-channelanalogscanner.Itcanbeadrop-inreplacementfortheZOC33orcanbeusedtoexpandanexistingZOC33system.TheelectricalinterfaceoftheMPS4164isexactlythesameasaZOCscanner.Theelectricalconnectoristhesamemeaningitoperatesusingexistingcablingandhardwareinfastructure.FirmwareintheDSM4000andtheERAD4000canbeeasilyfield-updatedtosupporttheMPS4164*.AnintegratedTEDsIDchipintheMPS4164supportsautomaticsystemconfigurationatsystempower-up.ThepneumaticinterfaceandvalvelogicoftheMPS4164isalsothesameasaZOCscanner.Inthe"CPx"configuration,theMPS4164operates65psicontrolpressureswiththesamecontrollogicasaZOC33.ThisallowssinglelogicoperationinmixedZOC/MPS4164system.WhiledirectlylegacycompatiblewiththeZOCscanners,theMPS4164offersmanyfeatureupgrades.Overallsensorperformanceisimproved,theoperatingtemperatureisextended,thescannerisphysicallysmallerandtheMPSvalveincludesfull"isolate-purge"functionality.
Analog Interface
Connection
Removable inputheaders
(available with 0.031" and
0.042" tubes)
Multiple mounting options (side and bottom)
*DSM4000firmwareV2.16andERAD4000firmwareV2.19andlaterfullysupportMPS4164
Improved sensors, Improved AccuracyTheprimaryfocusoftheMPS4164wastoimprovetheunit'soverallaccuracyacrosstheentiretemperaturerange.ScanivalveworkeddirectlywithaleadingsensordesignertocreateacustomsensorpackagespecificallyfortheMPSseriesofscanners.ThisdesignusestwolayersofRTVtoisolatethepressuresensorfrommechanicalinfluenceslikethosecausedbythermalexpansionorassembly.PiezoresistivesensorsalsochangegreatlyinspanandzeroovertemperaturesoweplacedeightindividualRTDsinverycloseproximitytothesensors.Combinedwiththedesignplacingthesensorsinanaluminumhousinginthecenterofthemoduletopreventrapidtemperaturechanges,theseRTDsallowustoaccuratelycorrectforanychangeinthesensor'sbehaviorduetotemperature.
MPS4164 Sensor Pack
Pneumatic Calibration ValveThevalvedesignisasliding-typevalve.Analuminumshuttle,populatedwithself-lubricatingO-ringscyclesbackandforthbetweentwopositionstoachieveeachofthepneumaticstates.The"bearingplate"betweentheslidingO-ringsandthealuminumstationaryportionofthevalveisaproprietarycompoundthatisextremelylowfriction.TheO-ringsaresupportedcompletelytopreventanydeformationduringastatechange.Thevalveshuttleissupportedonballbearingstoprovideminimalfrictionandmaximumsupport.Thisdesignallowsforlowactuationforceandminimal“stiction”-meaningtheactuationforcedoesnotnoticeablyincreaseafterlongperiodsofdormancy.Samplesofthevalvedesignweretestedtoover1,000,000cycleswithoutmaintenance.
Exploded view of the
valve
Removable pressure input headers are
standard
Existingpressurescannersrequireoutsidepneumaticpressureasaforcetoswitchthevalvelogic.Inmostapplications,this"controlpressure"mustbecontinuouslysuppliedtothescannertomaintainthedesiredvalvestate.TheMPS4164offersauniqueoptionwithavalvethatdefaultstothe"measurement"mode,allowingsamplepressurestobereadwithoutanyoutsidepneumaticcontrolpressure.Thisoption,called"NormalPx,"isanotherwaytheMPS4164simplifiessystemarchitecture.Anopticalvalvepositionsensorhasbeenintegratedallowingthevalvestatetobequeriedwithasimplesoftwarecommand.
Example Wind Tunnel System Architecture
Shown using ERAD4000 mounted in the test article. Alternate system configuration uses DSM4000 installed under the test
section or in the control room.
1.27
.050
1.259
31.98
29.08
1.145
6.86
.270
.659
3.515
89.28
1.422
36.12
105.41
4.150
PRESSURE INPUT
P2
P1
P16
P15 P17
P18
P31
P32
(Px CTL) FOR CPxSPRING RETURN FOR NPx
CHANNEL 1~32(PRG)
ISOLATE-PURGE
(REF)PRESSURE INPUT
REFERENCE
(CAL)
P33
P34
P47
P48
P49
P50
P63
P64
PRESSURE INPUTCALIBRATION
CHANNEL 33~64(PRG)
ISOLATE-PURGE
(CALCTL)PRESSURE INPUT
CALIBRATION CONTROL
MEASUREMENT CONTROL
ANALOG CABLECONNECTION
(MATE: 15 PIN MDM 15SL2P)
22.23
.875
MTG HOLE
MTG HOLE
3.910
99.31
3.18
.125
MOUNTING
HOLE
Dimensions (for MPS4164 version) Inches[mm]
Specifications (for MPS4164 version)
Inputs (Px): 0.042"[1.067mm]OD(standard) 0.031"[.787mm]OD(optional)
Inputs (Cal, Ref, CTL, Prg): 0.063"[1.600mm]OD
Full Scale Ranges: 4inH2O,8inH2O,1psid,5psid, 15psid
[995.4Pa,1990.7Pa,6.89kPa, 34.5kPa,103.4kPa]Accuracy: 4inH2O: 0.20%FS 8inH2O: 0.15%FS 1psid: 0.08%FS 5psid: 0.08%FS 15psid: 0.08%FSOverpressure Capability: 4inH2O: 25x 8inH2O: 15x 1psid: 10x 5psid: 10x 15psid: 5x
Media Compatibility: Gasescompatiblewithsilicon, silicone,aluminum,andBuna-N
Maximum Reference Pressure: 50psig(345kPa)
MaximumEnvironment Pressure:100psia(690kPaabsolute)
MinimumEnvironment Pressure:0.5psia(3.45kPaabsolute)
Shock & Vibration: MIL-STD-810G,Category24
Scan Rate: 40kHz (standalone)
Power Requirements: +15Vdc@120mA -15Vdc@30mA
Control Pressure Requirements: 65psi(CPx) 120psi(NPx)
Electrical Connector: 15 pin MDM 15SL2P Weight: 6.59oz[186.9g]
Operating Temperature: 0°to70°C
Storage Temperature: 0°to80°C
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