MPS4264
Miniature Pressure Scanner
ModelFeatures• Integral processor for direct Ethernet connection• New valve design provides "isolate-purge"• Dynamic zero correction for unmatched sensor stability• Standard or "Normal Px" valve control• IEEE1588-2008v2 PTP compatible• Up to 2,500 samples/channel/second*• Simple LabVIEW® integration• Removable input headers• Wide operating voltage (9-36Vdc)• Integral web server

General Description

MPS4264 Ethernet
Pressure Scanner

The MPS4264 miniature pressure scanner
represents the forefront of pressure measurement
technology.  It has been designed from the groundup with size, accuracy and functionality in mind.  Itboasts 64 pressure channels, small footprint, TCP/
IP Ethernet connectivity, and a wealth of other
innovative features.  

legacy products, but two different valve actuation
options are available.  The "standard" actuation
uses opposing 65psi control pressures to shift thevalve into whichever state is desired.  The new"normal Px" option uses a spring to default thevalve into measurement mode and 90psi to shift it
into calibrate mode.  

The MPS4264 is designed around a core sensor
pack that uses a custom packaged, ultra-stablesensor. Scanivalve engineers evaluated known
causes of non-repeatability in piezoresistive
pressure transducers.  Designing a double
isolation method of bonding the sensors to thebase substrates (patent pending) minimizes themechanical influences of assembly and thermalexpansion. This process dramatically improves thestability and the resulting accuracy of the sensors.

The electronics are designed around a highperformance DSP processor to produce 64 channel
data in excess of 850 Hz (readings per channel
per second). “Fast mode” can achieve rates of2500 Hz. The  onboard flash holds the pressuretemperature matrix that converts raw A/D counts toprecise engineering unit data over a wide range oftemperatures. The power conditioning circuit allow
a wide power supply range and minimize module
self-heating.

Scanivalve engineers also developed a proprietarymeans of maximizing sensor stability for spanand offset.  This technique of “Dynamic ZeroCorrection” greatly improved the sensor’s stability
over time and temperature (patent pending).  
The increase in overall sensor stability reduces
the need for zero offset and span calibrations,
resulting in significantly reduced test interruptions
and down time.

The MPS makes communication simple byincluding an integrated web server and supportinga wide variety of  protocols.  The MPS also
supports IEEE-1588v2 Precision Time Protocol.  
Leveraging this technology allows the user tosynchronize multiple MPS units and any otherdevices supporting IEEE-1588 sub-microsecond
resolve.  While IEEE-1588 support essentiallyeliminates the need for an external trigger, the MPS
still retains support for both a frame trigger and ascan trigger.    

A brand new valve has been designed that fully
isolates the sensors from purge pressure andprovides long term, maintenance free operation.  
Not only is the valve design an improvement over

* When limiting the channel scan list to 16 channels using the "Fast Scan" feature

ISO 9001:2008 CERTIFIED

Removable input
headers(available with0.031" and0.042" tubes)
PowerConnection(9-36 Vdc)
Power, Link &LAN activity
lightsEthernet
Connection
Multiple mounting options(side and bottom)

Applications
The MPS4264 electronic pressure scanning module is specifically designed for use in wind tunnel and flight tests where operational conditions
are very space constrained and pressures do not
exceed 50 psi. It is ideal for use inside small supersonic wind tunnel models.
The very low pressure ranges offered and small
size also make it an ideal fit for wind engineering
applications where the measurement pressures arevery low.  
It may be mounted in any position so the pressure
sensors may be close coupled to the pressuresources to be measured. Removable headers allow
for easy installation and removal without breaking
the pneumatic lines.
When the MPS4264 is used for flight test, it must
be installed in a Thermal Control Unit (TCU).  This
allows the unit to be operated in high vibration environments down to -50°C.

Supporting Accessories
To make integration of the MPS4264 simple,
Scanivalve has a full line of supporting accessories
including:••••Desktop power supply, supporting 5 units
Thermal Control Unit for extreme
environments
Miniature 4 and 8 port Ethernet Switch
Custom Ethernet and power cables

Communications
Communication to the MPS is through a miniature
Ethernet connection with an impressive arrayof protocols. The user can connect to the MPSusing a Web Browser. This graphical interface
allows the operator to change settings, scan data
to the screen or scan binary or ASCII data to a
file on the host machine with a click of a mouse.
The MPS can also stream data to an FTP server.
ASCII commands may be issued via a Telnet client
connected to the MPS Telnet server. A Multicast
protocol is employed that allows multiple MPS
devices to all start scanning in concert by sending
a command to a single device. The MPS also
supports a binary server that is optimized for aLabVIEW® interface. Example LabVIEW VIs areavailable.
The MPS uses the latest Precision Time Protocol(IEEE-1588v2) standard to time correlate data. This
exciting protocol allows any 1588 slave device tosynchronize its time to sub microsecond accuracy
without the use of external trigger signals. PTP can
synchronize any IEEE-1588 compliant physicalmeasurement device or a computer to a common
Grand Master time.

LabVIEW® is a registered trademark of National Instruments.

Improved sensors, Improved
Accuracy
The primary focus of the MPS4264 was to improvethe unit's overall accuracy across the entiretemperature range.  Scanivalve worked directlywith a leading sensor designer to create a custom
sensor package specifically for the MPS scanner.  
This design uses two layers of RTV to isolate thepressure sensor from mechanical influences likethose caused by thermal expansion or assembly.  
Piezoresistive sensors also change greatly in spanand zero over temperature so we placed eightindividual digital temperature chips in very close
proximity to the sensors.  Combined with the design
placing the sensors in an aluminum housing in thecenter of the module to prevent rapid temperaturechanges, these chips allow us to accurately correct
for any change in the sensor's behavior due totemperature.   

MPS4264Sensor
Pack

Along with the pressure sensors, all components
in the measurement circuit are effected bytemperature and drift over time.  Scanivalve
designed a patent-pending architecture which
continuously corrects for these changes overtime, while the unit is scanning.  This techniqueof “Dynamic Zero Correction” greatly improves
the stability of the entire system over time andtemperature.  This is accomplished completely"behind the scenes," does not affect performanceand requires nothing of the user.
The advanced sensor technology, careful
packaging and innovative "Dynamic ZeroCorrection" function greatly improve the stability
and repeatability of the system.  With these
improvements the need for zero offset calibrations(CALZ) and span calibrations is dramaticallyreduced.  This results in fewer test interruptions,less down time and increased overall efficiency.   

Explodedview of thevalve

Pneumatic Calibration Valve
The valve design is a sliding-type valve.  Analuminum shuttle, populated with self-lubricatingO-rings cycles back and forth between two
positions to achieve each of the pneumatic states.  
The "bearing plate" between the sliding O-rings andthe aluminum stationary portion of the valve is a
proprietary compound that is extremely low friction.  
The O-rings are supported completely to preventany deformation during a state change.  The valve
shuttle is supported on ball bearings to provide
minimal friction and maximum support.  This design
allows for low actuation force and minimal “stiction”- meaning the actuation force does not noticeably
increase after long periods of dormancy.  Samplesof the valve design were tested to over 1,000,000
cycles without maintenance.
Existing pressure scanners require outside
pneumatic pressure as a force to switch the valve
logic.  In most applications, this "control pressure"must be continuously supplied to the scanner tomaintain the desired valve state.  The MPS4264
offers a unique option with a valve that defaults
to the "measurement" mode, allowing sample
pressures to be read without any outside pneumatic
control pressure.  This option, called "Normal Px,"
is another way the MPS4264 simplifies systemarchitecture.
An optical valve position sensor has been
integrated allowing the valve state to be queried
with a simple software command.

Removablepressure input
headers arestandardInputs (Px):
Inputs(Cal, Ref, CTL, Prg):
Full Scale
Ranges:Accuracy:

Overpressure
Capability:

A/D Resolution:
Media
Compatibility:(for MPS4264 version)

0.042" [1.067mm] OD (standard)
0.031" [.787mm] OD (optional)
0.063" [1.600mm] OD

Maximum
Reference Pressure:psig50(345kPa)

Maximum
Environment Pressure:100 psia (690kPa absolute)
Ethernet Connection:

4 inH2O, 8 inH2O, 1psid, 5psid,15psid, 50psid

External Trigger:[995.4Pa, 1990.7Pa, 6.89kPa,34.5kPa, 103.4kPa, 344.7kPa](samples/channel/second)

4 inH2O:
8 inH2O:
1psid:
5psid:
15psid:50psid:0.20%FS
0.15%FS
0.06%FS
0.06%FS
0.06%FS
0.06%FS

4 inH2O:
8 inH2O:
1psid:
5psid:
15psid:50psid:25x15x15x10x5x2x

24bit

100baseT,
MDIX auto-crossing
5-15Vdc,6.5mA

Data Output Rate:

TCP/IP Binary: 850Hz"Fast Mode": 2500Hz

PowerRequirements:

9-36Vdc, 3.5W

Control Pressure
Requirements:

65psi min. (standard)
90psi min. (normal Px version)

Mating Connectors:
Ethernet:
Power:TE Connectivity PLG 8P8C Mini2TE Connectivity PLG 8P8C Mini1

Weight:6.59oz [186.9g]

OperatingTemperature:0°

Storage Temperature:

to 70°C-50°C to 60°C with TCU
to 80°C
0°Gases compatible with silicon,
silicone, aluminum, and Buna-N

Dimensions (for MPS4264 version) Inches [mm]Scanivalve Headquarters
1722 N. Madson Street
Liberty Lake, WA 99019
Tel:
509-891-9970
800-935-5151
Fax:
509-891-9481
e-mail: scanco@scanivalve.com

www.scanivalve.comPrinted in USA©
2016, Scanivalve Corp.
株式会社大手技研

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