AST A250+ PL/TL/Video User manual

AST A250+/A450+ PL/TL Video
USER MANUAL
Accurate Sensors Technologies
Non-contact Infrared Pyrometers
We measure accurate temperature in extreme conditions
AST - Accurate Sensors Technologies
Misgav Industrial Park
Tel: [phone], Fax: [phone]
Email: [e-mail]
Web: www.accuratesensors.com
, Misgav 20173, Israel

Index
1. Chapter-1
Generalinformation
2. Chapter-2 ....................................................................................................................... 2
Introduction
2.1 ProductKeyFeatures,ApplicationandRange
2.2 Technicalspecification
2.3 Optics
3. Chapter-3 ....................................................................................................................... 5
Basics&InstallationofPyrometer
3.1 BasicsofInfraredtemperaturemeasurementofanobject
3.2 Installation
3.3 LocationSelection
3.4 MechanicalAccessories
3.5 ElectricalInstallation
4. Chapter-4 ....................................................................................................................... 13
SettingattheInstruments
4.1 Operation
4.2 KeyDescriptions
4.3 AdjustableParameters
4.4 OtherParameters
5. Chapter-5 ....................................................................................................................... 17
Softwareinstallation
4.1 Installation
4.2 Parametersinmainscreen
6. Chapter-6 ....................................................................................................................... 24
Maintenance
7. Chapter-7 ....................................................................................................................... 25
Serialcommunicationprotocol
8. AppendixB ....................................................................................................................... 30
10.AppendixC ....................................................................................................................... 31
....................................................................................................................... 1
Accurate Sensors Technologies

CongratulationsonchoosingthishighqualityandhighlyefficientASTpyrometerfornoncontacttemperature
measurement.
Pleasereadthisusermanualcarefully,stepbystep,includingallnotesofsecurity,operationandmaintenance
beforeinstallingthe pyrometer.This manual containsall thenecessary instructions forsetup andoperationof the
pyrometer.Thissectionprovidesanoverviewaboutimportantsafetyregulations.
SomeImportantSafetyRegulationsGivenBelow
1. SafetyPrecaution
Eachpersonworkingwithpyrometermustreadtheusermanualbeforeoperation.Thepyrometerhasonlyto
be usedforthe purposedescribed inmanual. Thepyrometerworksonly with apotential freelow voltageof range
24VDC.Thisvoltageisnotharmfulforuser.Thepyrometermaycontainharmfulmaterialandhenceitshouldnotbe
disposedofwithnormalwaste.
2. PackagingandStorage
Alwaysuseashockproofpackageforshipmentofpyrometer.Itshouldbesealedtoprotectitagainsthumidity.
Alsoprotectthelensofpyrometerwithcover.Theyshouldbestoredatthetemperaturerangefrom-20°cto70°c.
3. LimitofLiabilityandWarranty
All general information and notes for handling, maintenance and cleaning of this instrument are offered
accordingtothebestofourknowledgeandexperience.
ASTreservestherighttorevisethisdocumentandtomakechangefromtimetotimeinthecontenthereofwithout
obligationtonotifyanypersonorpersonsofsuchrevisionsorchanges
ASTinstrumentshaveawarrantyoftwoyearfromtheinvoicedate.Thiswarrantycoversmanufacturingdefectsand
faultswhichariseduringoperationonlyiftheyarethe resultsofdefectscausedbyAST.
AST does not accept liability for any damages or losses which might occur, including consequential damages and
financiallosses,asaresultofuseoftheinstrument.
4. Copyright
Allrightsreserved.thisdocumentmaycontainproprietaryinformationandshallberespectedasaproprietary
documenttoASTwithpermissionforreviewandusagegivenonlytotherightfulowneroftheinstrumentwithwhich
thisdocumentisassociated.
Chapter - 1
General Information
1
Accurate Sensors Technologies

Chapter - 2
Introduction
AST A250+/A450+ PL/TL/Video are specially designed highly accurate digital pyrometers to provide high
performance and low maintenance of non contact temperature measurement in demanding industrial
environment.
2.1 ApplicationandRange
The AST A250+/A450+ PL/TL/Video pyrometers are especially designed for industrial purposes. They are
suitableforhightemperaturemeasurementrangingfrom210°Cto3000°C.
Thesepyrometershavesolidbodyinstainlesssteelhousing,whichprovideshighoperationsafetyeveninrough
industrialenvironment,andlargevarietyoffocusableopticswhichcanbeeasilyusedinallindustrialareas.
These pyrometers have OLED display which shows temperature and provides menu selection via
parameterizaion keys. AST A250+/A450+ PL/TL/Video have fast response time of 2msec. The RS-485 for long
distance communication between pyrometer & PC software Infrasoft. Response time, emissivity, sub-range and
peakpickerselectioncanbepresetex-worksoradjustablethroughavailablesoftware.
The pyrometer temperature measurement method utilizes the fact that objects emit thermal radiation in an
amountthatdirectlycorrespondstotheirowntemperatureandsurfaceemissivity.
The pyrometer sensor detects the amount of infrared radiation emitted by the measured object (target). The
infrared signal is analyzed and the temperature it represents is analyzed by built-in microprocessor. AST
A250+/A450+PL/TL/Videoworkin4-wiretechnology.
TheapplicationsinwhichASTpyrometerscanbeusedare
üPreheating
üAnnealing
üTempering
üWelding
üForging
üHardening
üMelting
üSintering
üSoldering
üRolling
üBrazing
üNormalizing
ProductKeyFeatures,
StandardItemsuppliedwithASTA250+/A450+PL/TL/Video
üASTpyrometer
üConnectioncable12-core(length-5m)
üASTsoftwareCD
üManual
üCertificateofcalibration
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2.2 Technical Specifications
Model A250+ PL/TL/Video A450+ PL/TL/Video
Temperature Range
(Analog sub-range adjustable)
Spectral Range
Photodetector Type
Distance to Spot Size Ratio
Emissivity (ε)
Response Time
Accuracy
Repeatability
Sighting Options
Analog Output
Digital Output
Operating Temp. Range
Storage Temp. Range
Adjustable Parameters and Features via Software/
Keypad
210°C….1350°C
250°C….1800°C
300°C....2500°C
350°C....3000°C
1.6 µm
InGaAs
75:1 (210°C….1350°C)
150:1 (250°C….1800°C)
300:1 (300°C….2500°C)
300:1 (350°C.... 3000°C)
0.1….1.0 adjustable
2 msec adjustable upto 10 sec
± 0.3% of the measured value + 1°C
0.1% of reading in °C + 1°C
Laser Pilot Light (PL) / ThroughThe Lens (TL) / Video output
RS-485 (Isolated)
0°C…….70°C
0°C…..200°C (With water cooling jacket)
-20°C…70°C
Emissivity, Response Time, ClearTime(Peak Picker),Analog Output, Analog Scale (Sub Range),
Unit Of Temperature(°C/°F), Record feature, Match Temperature etc.
600°C….2500°C
1.0 µm
Si
300:1 (600°C….2500°C)
0-20mA, 4-20mA(User selectable)
Power Supply
Power Consumption
Laser Power
Protection Class
Housing
Isolation
Operating Humidity
Weight & Dimensions
12V to 28V DC with reverse voltage protection
Max 2.5 watt - PL/TLmodels
Max 3.5 watt - Video models
<1 m watt (Only PLModel)
IP65
Stainless Steel
Power supply, Digital output andAnalog output are galvanically islolated against each other
10-95%, Non-Condensing Conditions
1200g
Dia= Ø56 mm; Length=185.5mm
Dimensions
Fig. 1 Dimensions of Pyrometers
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Relay Output Relay output with hysteresis 60V DC / 42VAC RMS, 0.4A
Model A450C+ PL/TL/Video
Pixles
Video Format
Video Output
Impedance
Image Sensor
MaximumAnalog Video Cable Run
Cable Connection Type
Operating Temperature
1/4 " CMOS
Upto 40m Special Co-axial Cable Used
BNC
0°C ..... 65°C
640 x 480
PAL
CVBS
75R
2.3 Video Specifications

475 6.40 3.20 1.60
Spot Sizes(mm)
Focused working distances
WD (mm)
500
700
800
1000
1500
2000
3000
5000
A250+
210°C - 1350°C
(75:1)
6.70
9.40
10.70
13.40
20.00
26.70
40.00
66.70
A250+
300°C - 2500°C
350°C - 3000°C
(300:1)
3.40
4.70
5.40
6.70
10.00
13.40
20.00
33.40
A450+
600°C - 2500°C
(300:1)
1.70
2.40
2.70
3.40
5.00
6.70
10.00
16.70
2.3 Optics
measured. This heat radiation is passed through the lens sensor and then converted to an electrical signal. The
fartherthemeasuredobjectfromthepyrometer,thelargertheareathatwillbemeasured.
Table1:Somefixedopticsfocusisasbelow
Thepyrometermeasuretemperaturebyreceivingheatradiationfromtheobjectwhosetemperaturehastobe
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Adjustingtherequiredmeasuringdistance:-
To achieve the spot sizes mention in the table above required
measuring distance must be adjusted. This can be done between the
smallest and the biggest limit value. For releasing the optics has to be
turned anti clock wise. Then it can be pushed or pulled to find the
correctmeasuringdistance.Forfixingtheopticshastobeturned clock
wise.
Adjustingthemeasuringdistancewiththehelpofthetable:-
The table mentions the minimum and maximum measuring
distance for each optics as well as serval other values. The length “L”
canwemeasuredwithacaliper.Thislength"L"canreachmax.upto14
mm.
Adjusting the measuring distance with help of the thru lens view
finder:-
The focusable optics is correctly adjusted to the required
distance,ifthemeasuringobjectisshown as a sharp image in the view
finder.Acirclemarksthepositionofthemeasuringspot.
Adjusting the measuring distance with help of the laser targeting
light:-
On the focused measuring distance the laser has a smallest spot
size. length “L”
Unlock
Anticlockwise
Lock
Clockwise
Length
LLength L
9000 120.00 60.00 30.00
14.00
13.20
8.70
7.40
5.70
3.50
2.40
1.40
0.50
0
13.60
12.70
8.50
7.20
5.50
3.40
2.30
1.30
0.50
0
Fig. 2 Adjusting Measuring Distance
A250+
250°C - 1800°C
(150:1)
1.60
1.70
2.40
2.70
3.40
5.00
6.70
10.00
16.70
30.00

Chapter - 3
Basics & Installation of the Pyrometer
3.1 Infraredtemperaturemeasurementofanobject
Each and every object emit definite amount of infrared radiation and its intensity varies according to the
temperatureofobject.Wavelengthofinfraredradiationliesapproximatelybetween0.7to14µmdependingonthe
material and properties of object. Infrared radiations are sometimes also referred to as “heat radiations” depends
mostlyon thematerial.This materialdependent constantvalueisknown as“emissivity”,havealookat appendixB
foremissivityvalues.
3.1.1 Emissivity(?)
Emissivityis theratioof energyradiatedfroman objectto theexteriorandenergyradiatedfrom blackbody.
Theemissivityvarieswiththesurfaceconditionoftheobjectandalsowithtemperaturevariationandwavelength.If
this value is not accurate, then the true temperature cannot be measured. In other words a variation or change in
emissivitywillcauseachangeinthemeasurement.
If the value of emissivity low, your measured results may contain some errors due to interfering infrared
radiationsformobjects whicharebehindthe targetobjectlikeheatingsystems,fireclaybrisketc.Usuallysuch type
ofproblemsoccurswhilemeasuringverythinmaterialslikeglass,plasticetcorsomereflectingsurface.
This error can be reduced if the sensor is shielded from reflecting radiation sources and also by properly, carefully
installingthedevice.
BytheapplicationofKirchhoff'slawofthermalradiation“atthermalequilibrium,theemissivityofthebodyis
equaltoitsabsorptivity(α)”.Soforperfectblackbody,?is1whileanyrealobjectwouldhave? lessthan1.Alsothe
transmissivity(т)andreflectivity(ρ)iszero.Thesumofabsorptivity,reflectivityandtransmissivityisalways1.
α + ρ + т= 1
Byemissivityfactormaterialscanbecategorizedas
üMetals
üNonmetals
üTransparentmaterials
3.1.2 Calculationofemissivityoftargetobject
Therearevariousmethodstodo sobutoneofmostprominentlyusedisCalculatetheactualtemperatureof
targetobjectusingaRTD,Thermocoupleetc.Measuretheobject'stemperaturebypyrometerandadjustemissivity
settings in pyrometer unless correct temperature value is reached. Hence correct emissivity is measured of the
targetobject.
3.2 Installation
3.2.1 Mechanicalinstallationofpyrometer
Afterallpreparationsarecompletedyoucaninstallpyrometer.Installationofpyrometerdependsonthetype
ofbracketyouareusingandthetypeofsurface.
Basicsof
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3.2.3 ViewingAngles
Thepyrometercanbeplacedatanyanglefromthetargetobjectupto30°.indicatedinthebelowdiagram.
Fig.3 Proper mounting of pyrometer
Fig. 4 Pyrometer Acceptable Viewing angles
Background
Best
critical
Incorrect
Pyrometer
Target greater than
spot size
Target equal to
spot size
Target smaller
than spot size
Acceptable
Angles
Pyrometer
Best
90°C to target
Good
30°C to 90°C target
Bad
0°C to 30°C target
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3.2.2 Distanceofpyrometerfromobject
Thedesiredspotsizeon thetargetwill determinethemaximummeasurementdistanceandthefocallength
of the optical module. To avoid wrong readings the spot size of target must contain entire field view of the
pyrometer.Thepyrometermustbemountedsotheentirefieldofviewisthesameorsmallerthanthedesiredtarget
size.Thisisindicatedinthebelowdiagram.

3.3 Locationselection
Qualified operating person should do the installation. Location should be good enough so that pyrometer
shouldgetcontinuousinfraredradiation.
Pyrometerdistancefromobjectisaccordingtobelowpoints:-
1. Pyrometerspotsizeshouldbesmallthanobjectsize.(read3.2.2&3.2.3)
2. Knowyourpyrometerspotsizeaccordingtopoint2.3.
3. Pyrometerambienttemperatureshouldbewithin0°to70°C(read3.3.3).
3.3.1 CorrectPositioningofthepyrometer
Withpilotlight(PL)
Alaser targetinglightwillhelptocorrectthe positionofthepyrometer.Itis recommendedthatlasershould
be switched offwhile measurement. Itwill increasethe life oflaser.To avoidmeasuring errors caused bya too big
spotsizethepyrometermustbefixedinthecorrectmeasuringdistance,sothattheobjectundermeasurementfills
thespotsize.
Withthroughthelenssighting(TL)
In case of through the lens sighting a reticule circle marks the position of the measuring spot. This circle is
true-sidedandparallax-free.
WithcompositeVideooutput
Incaseof videooutputareticlecircleonthecenterof cameraviewmarksthepositioningof themeasuring
spot.Thecameraviewshowsrealtemperatureofthetargetandreticleonthecenteroftheview.
Note:Thelaserspot(PL)/reticulecircle(TL)isonlyforindicationofmeasuringspot,notexactlyshowsthemeasuring
area.
3.3.2 Mountingofpyrometer
To install the pyrometer at the place of measurement a mounting support is supplied as an accessory, after
losingtheclampscrews,pyrometercanbemountedcorrectlyinthemountingclamp.
3.3.3 Ambienttemperature
The allowed operation temperature for the pyrometer is 0°C to 70°C. Therefore if pyrometer is to be used
above 70°C upto 200°C water cooling jacket with built in air purge unit is used otherwise it may damage the
pyrometer. The ambient temperature is dependent on the temperature and flow rate of cooling water. Details of
watercoolingjacket&airpurgearegiveninpoint3.4.1.
3.3.4 Atmosphericconditions
The pyrometer cannot receive the full infrared energy for the measurement if atmospheric conditions like
smoke, dust or steam are present and hence it result in measuring error. An air purge unit can be helpful to avoid
contaminationsuch as dust andhumidity on thelens. Theair supplied shouldbe atnormal temperature withoil &
moisturefree.Theairpurgegeneratesanairstreamshapedlikeaconeandblowsparticlesfromthelensarea.
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Fig. 6
(Reference no: 8500-05)
Air Purge Unit
ŸAirpressure : <0.5bar
ŸAirconsumption : 2...3m³/h
ŸMetal : Aluminium
ŸWeight : 0.5Kg
ŸDry,cleanair(Oilanddustfree)
3.4 Mechanical Accessories
ŸWaterpressure : <10bar
ŸAirpressure : <0.5bar
ŸAirconsumption : 2...3m³/h
ŸAmbienttemperature : <200°C
ŸMetal : Stainlesssteel
ŸWeight : 3.0Kg
3.4.1 WaterCoolingJacket
This accessory is very important in order to use pyrometer at higher
temperature. Anormal pyrometer can withstanda temperatureof 0-70°C.For
higher temperature applications the device must be used with water cooling
jacketupto200°C.(formechanicaldrawingreferAppendixC.)
Fig. 5 Water Cooling Jacket
(Reference no: 8500-09
3.4.2 AirPurge
This accessory is used to keep dust, moisture, airborne particle and
vapoursawayfromthelensheadsothatcorrectsightingoftargetobjectcanbe
done.(formechanicaldrawingreferAppendixC.)
3.4.3 Adjustablemountingstand
This adjustable mounting stand will provide appropriate movement to
thepyrometer.(formechanicaldrawingreferAppendixC.)
Fig. 7 Adjustable Mounting Stand
(Reference no: 8000-07)
ŸMetal : StainlessSteel
ŸWeight : 0.9Kg
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Fig. 8 Mounting Clamp
(Reference no: 8500-04)
ŸMetal : StainlessSteel
ŸWeight : 0.45Kg
3.4.4 Mounting Clamp
Mounting clamp can be used to hold the pyrometer.(for mechanical
drawingreferAppendixC.)Fig.8.
Fig. 9 Mounting Flange
(Reference no: 8500-07)
3.4.5 Mounting Flange