AST T3-814 User manual

AST T3-814
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

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Index
1. Chapter - 1
General information
2. Chapter - 2 ....................................................................................................................... 2
Introduction
2.1 Product Key Features, Application and Range
2.2 Technical specification
2.3 Optics
3. Chapter - 3 ....................................................................................................................... 5
Basics & Installation of Pyrometer
3.1 Basics of Infrared temperature measurement of an object
3.2 Installation
3.3 Location Selection
3.4 Mechanical Accessories
3.5 Electrical Installation
4. Chapter - 4 ....................................................................................................................... 12
Software installation
4.1 Installation
4.2 Parameters in main screen
5. Chapter - 5 ....................................................................................................................... 18
Calculate Spot size
7. Chapter - 6 ....................................................................................................................... 19
Maintenance
8. Chapter - 7 ....................................................................................................................... 20
Serial communication protocol
9. Appendix B ....................................................................................................................... 25
10. Appendix C ....................................................................................................................... 26
....................................................................................................................... 1

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Congratulations on choosing this high quality and highly efficient AST pyrometer for non contact temperature
measurement.
Please read this user manual carefully, step by step, including all notes of security, operation and maintenance
before installing the pyrometer. This manual contains all the necessary instructions for set up and operation of the
pyrometer. This section provides an overview about important safety regulations.
Some Important Safety Regulations Given Below
1. Safety Precaution
Each person working with pyrometer must read the user manual before operation. The pyrometer has only to
be used for the purpose described in manual. The pyrometer works only with a potential free low voltage of range
24VDC. This voltage is not harmful for user. The pyrometer may contain harmful material and hence it should not be
disposed of with normal waste.
2. Packaging and Storage
Always use a shock proof package for shipment of pyrometer. It should be sealed to protect it against humidity.
Also protect the lens of pyrometer with cover. They should be stored at the temperature range from -20°c to 70°c.
3. Limit of Liability and Warranty
All general information and notes for handling, maintenance and cleaning of this instrument are offered
according to the best of our knowledge and experience.
AST reserves the right to revise this document and to make change from time to time in the content hereof without
obligation to notify any person or persons of such revisions or changes
AST instruments have a warranty of two year from the invoice date. This warranty covers manufacturing defects and
faults which arise during operation only if they are the results of defects caused by AST.
AST does not accept liability for any damages or losses which might occur, including consequential damages and
financial losses, as a result of use of the instrument.
4. Copyright
All rights reserved, this document may contain proprietary information and shall be respected as a proprietary
document to AST with permission for review and usage given only to the rightful owner of the instrument with which
this document is associated.
Chapter - 1
General Information

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Chapter - 2
Introduction
AST T3-814 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 Application and Range
The AST T3-814 pyrometers are especially designed for industrial purposes. They are suitable for high
temperature measurement ranging from 0°C to 1000°C.
These pyrometers have solid body in stainless steel housing, which provides high operation safety even in rough
industrial environment, and large variety of optics with fixed focus which can be easily used in all industrial areas.
AST T3-814 both are having a fast response time of 60msec. The Pyrometer provided with Infralink (USB
Interface) for communication between pyrometer & PC software Infrasoft. Response time, sub-range and peak
picker selection are adjustable through available software.
The pyrometer temperature measurement method utilizes the fact that objects emit thermal radiation in an
amount that directly corresponds to their own temperature and surface emissivity.
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 micro controller. AST T3-814 work
in 2-wire technology.
Product Key Features,
üIn glass hardening and bending
üTemperature measurement of float glass
The applications in which AST pyrometers can be used are
Standard Item supplied with AST T3-814
üPyrometer with 3 mtr. long connection cable üTTL output
üAnalog output 2 wire....4-20 mA üCalibration certificate, Operation manual
üEmissivity adjustable switch
Optional
üExtra cable lengths üUSB Interface card & PC Software
üMechanical and Electrical Accessories
Features
üTwo wire technology for easy electrical ü60 ms response time adjustable upto 10 sec
connection üAnalog output 2 wire....4-20 mA (Isolated)
üWide temperature range 0°C....1000°C üDigital TTL output & Infrasoft software
üSpectral range 8....14 µm üSmall spot sizes
üLaser Light for precison targeting of the üEmissivity can be adjusted directly at device
measuring object üAccessories for mounting and cooling options

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2.2 Technical Specifications
Dimensions of Pyrometer (mm)
40
113.50
Fig. 1 Dimensions of pyrometer
Repeatability
Sighting Option
Analog Output
0.3% of reading in °C + 1°C
Laser Pilot Light (PL)
2 wire....4-20mA
Linear Temperature Output
Load : Max 500Ω at 24V DC, Max 200Ω at 18V DC
Model T3-814 PL
Spectral Range
Photodetector Type
Distance to Spot Size Ratio
Emissivity (ε)
Response Time
Accuracy
Temperature Range
(Analog sub-range adjustable)
0°C….1000°C
75°C…1000°C
8 ...14 µm µm
Thermopile
50:1
100:1
0.1….1.0 adjustable
60 msec adjustable upto 10sec
T < 200°C; ± 1.5% of measured value or 3°C whichever is greater
T ≥ 200°C; ± 1% of measured value or 4°C
whichever is greater
(The instrument must be at constant ambient
temperature for minimum 25-30 mins in power
on condition)
Weight & Dimensions 250g
Dia=Ø40mm; Length=113.5mm
Operating Humidity 10-95%, Non-Condensing Conditions
Power Consumption
Laser Power
Protection Class
Housing
For Laser Targeting Max 0.65 watt
For Device Max 0.6 watt
<1 m watt
IP65
Stainless Steel
Digital Output
Operating Temp. Range
Storage Temp. Range
Adjustable Parameters and Features
via Software
TTL
0°C…….70°C
0°C…..200°C (With water cooling jacket)
-20°C…70°C
Emissivity, Response Time, Analog Scale (Sub Range), Unit of
Temperature (°C/°F), Peak Picker, Valley Picker
Power Supply 24 V DC
(5 to 25 V DC for Laser Targeting light (I≤30 mA)

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Case-I: If installed working distance is greater than manufactured working distance
Case-II: If installed working distance is smaller than manufactured working distance
2.3 Optics
measured. This heat radiation is passed through the lens sensor and then converted to an electrical signal. The
farther the measured object is from the pyrometer, the larger the area that will be measured by the pyrometer.
Depending on customer need, the pyrometer is designed with fixed optics.
Table 1 :Some fixed optics focus is as below
The pyrometer measure temperature by receiving heat radiation from the object whose temperature has to be
mentioned on the pyrometer.
If the pyrometer is not installed at
manufactured working distance (WD) then spot size
at actual installed distance should be calculated. For
example, if factory made working distance is 500
mm & pyrometer is AST T3-814PL (0 - 1000°C) then
spot size is 5mm (as given in table). If user installed
this pyrometer at 1000mm then spot size is not
10mm (as given in table), user should have to
calculate it by below given method.
* Manufactured working distance (WD)
Fig. 2 Spot Size
Where : S= manufactured spot size of pyrometer(mm), A = It shows the value of lens opening (aperture in mm)
Spot Size (mm)
Distance (mm)
Optics 300
14 6 22 62
100 300 500 1000
21
700
Spot Size (mm)
Distance (mm)
Optics 500
13 10 16 38
300 500 600 1000
45.8
1500
Spot Size (mm)
Distance (mm)
Optics 800
17 24.5 88.3
300 1000 2500
16
800

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Chapter - 3
Basics & Installation of the Pyrometer
3.1 Infrared temperature measurement of an object
Each and every object emit definite amount of infrared radiation and its intensity varies according to the
temperature of object. Wavelength of infrared radiation lies approximately between 8.0µm to 14 µm depending on
the material and properties of object. Infrared radiations are sometimes also referred to as “heat radiations”
depends mostly on the material. This material dependent constant value is known as “emissivity”, have a look at
appendix B for emissivity values.
3.1.1 Emissivity (Ɛ)
Emissivity is the ratio of energy radiated from an object to the exterior and energy radiated from blackbody.
The emissivity varies with the surface condition of the object and also with temperature variation and wavelength. If
this value is not accurate, then the true temperature cannot be measured. In other words a variation or change in
emissivity will cause a change in the measurement.
If the value of emissivity low, your measured results may contain some errors due to interfering infrared
radiations form objects which are behind the target object like heating systems, fireclay brisk etc. Usually such type
of problems occurs while measuring very thin materials like glass, plastic etc or some reflecting surface.
This error can be reduced if the sensor is shielded from reflecting radiation sources and also by properly, carefully
installing the device.
By the application of Kirchhoff's law of thermal radiation “at thermal equilibrium, the emissivity of the body is
equal to its absorptivity (α)”. So for perfect black body, is 1 while any real object would have less than 1. Also the
transmissivity (т) and reflectivity (ρ) is zero. The sum of absorptivity, reflectivity and transmissivity is always 1.
α + ρ + т = 1
By emissivity factor materials can be categorized as
üMetals
üNon metals
üTransparent materials
3.1.2 Calculation of emissivity of target object
There are various methods to do so but one of most prominently used is Calculate the actual temperature of
target object using a RTD, Thermocouple etc. Measure the object's temperature and adjust emissivity settings unless
correct temperature value is reached. Hence correct emissivity is measured of the target object.
3.2 Installation
3.2.1 Mechanical installation of pyrometer
After all preparations are completed you can install pyrometer. Installation of pyrometer depends on the type
of bracket you are using and the type of surface.
Basics of
Ɛ Ɛ

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3.2.3 Viewing Angles
The pyrometer can be placed at any angle from the target object up to 30° indicated in the below diagram.
Fig.3 Proper mounting of pyrometer
Fig. 4 Pyrometer Acceptable Viewing angles
Background
Best critical
Incorrect
Target greater than
spot size Target equal to
spot size
Target smaller
than spot size
Acceptable
Angles
Best
90°C to target
Good
30°C to 90°C target
Bad
0°C to 30°C target
3.2.2 Distance of pyrometer from object
The desired spot size on the target will determine the maximum measurement distance and the focal length
of the optical module. To avoid wrong readings the spot size of target must contain entire field view of the
pyrometer. The pyrometer must be mounted so the entire field of view is the same or smaller than the desired target
size. This is indicated in the below diagram.
Pyrometer
Pyrometer
Pyrometer
Pyrometer

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3.3 Location Selection
Qualified operating person should do the installation. Location should be good enough so that pyrometer
should get continuous infrared radiation.
Pyrometer distance from object is according to below points:-
1. Pyrometer spot size should be small than object size.(read 3.2.2 & 3.2.3)
2. Know your pyrometer spot size according to point 2.3.
3. Pyrometer ambient temperature should be within 0° to 70°C (read 3.3.3).
3.3.1 Correct Positioning of the pyrometer
With pilot light (PL)
A laser targeting light will help to correct the position of the pyrometer. It is recommended that laser should
be switched off while measurement. It will increase the life of laser. To avoid measuring errors caused by a too big
spot size the pyrometer must be fixed in the correct measuring distance, so that the object under measurement fills
the spot size.
Note: The laser spot (PL) is only for indication of measuring spot, not exactly shows the measuring area.
3.3.2 Mounting of pyrometer
To install the pyrometer at the place of measurement a mounting support is supplied as an accessory, after
losing the clamp screws, it can be mounted correctly.
3.3.3 Ambient temperature
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
water cooling jacket& air purge are given in point 3.4.1.
3.3.4 Atmospheric conditions
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
contamination such as dust and humidity on the lens. The air supplied should be at normal temperature with oil &
moisture free. The air purge generates an air stream shaped like a cone and blows particles from the lens area.

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Fig. 6
(Reference no: 8700-01)
Air Purge Unit
ŸAir pressure : < 0.5 bar
ŸAir consumption : 2...3 m³/h
ŸMetal : SS-304
ŸWeight : 0.15 Kg
ŸDry, clean air (Oil and dust free)
3.4 Mechanical Accessories
ŸWater pressure : < 10 bar
ŸAir pressure : < 0.5 bar
ŸAir consumption : 2...3 m³/h
ŸAmbient temperature : < 200°C
ŸMetal : Stainless steel
ŸWeight : 2.75 Kg
3.4.1 Water Cooling Jacket
This accessory is very important in order to use pyrometer at higher
temperature. A normal pyrometer can withstand a temperature of 0-70°C. For
higher temperature applications the device must be used with water cooling
jacket upto 200°C.( for mechanical drawing refer Appendix C.)
Fig. 5 Water Cooling Jacket (air purge,
mounting clamp, water jacket combo)
(Reference no: 8700-02 (for PL)
3.4.2 Air Purge
This accessory is used to keep dust, moisture, airborne particle and
vapours away from the lens head so that correct sighting of target object can be
done. ( for mechanical drawing refer Appendix C.)
ŸMetal : Stainless Steel
ŸWeight : 0.45 Kg
3.4.4 Mounting Clamp
Mounting clamp can be used to hold the pyrometer.(for mechanical
drawing refer Appendix C.) Fig. 8.
Fig. 8 Mounting Clamp
(Reference no: 8500-04)
3.4.3 Adjustable mounting stand
This adjustable mounting stand will provide appropriate movement to
the pyrometer. ( for mechanical drawing refer Appendix C.)
Fig. 7 Adjustable Mounting Stand
(Reference no: 8000-07)
ŸMetal : Stainless Steel
ŸWeight : 0.9 Kg
Fig. 9 Aluminum jacket
(Reference no: 8700-01)
ŸMetal : Aluminium
ŸWeight : 0.2 Kg
3.4.5 Aluminum Jacket

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3.5 Electrical Installation
Fig. 13 Power Supply Unit
(Reference no: 9000-02)
24V DC (well stabilized ripple max 50mV).The input power supply is
110/230V AC. Check the polarity before connecting the device.
Device has following specifications
Power supply I/P : 100 - 240VAC, 0.35A
50/60 Hz
Power supply O/P : +24V DC, 0.625A
3.5.1 Power Supply
Fig. 12 Adjustable Mounting Stand + L Clamp
+ Water cooling jacket with air purge
(Reference no: 8000-02 or 8000-06 + 8700-02)
Adjustable
mounting
stand
Cooling Jacket
L Clamp
Water inlet/outlet
Air purge
3.4.6 Combination of Accessories
Fig. 11 Air purge unit + Mounting Clamp +
Pyrometer
(Reference no: 8700-01 + 8500-04)
Mounting Clamp
Air Purge Unit
Pyrometer
Fig. 10 Mounting Clamp + Pyrometer
(Reference no: 8500-04 )
Mounting
Clamp
Pyrometer
Fig. 14 Temperature Indicator
(Reference no: 9000-01)
3.5.2 Temperature Indicator

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3.5.3 Wire connections of Pyrometer
Following diagram & table shows proper wiring connection.
Fig. 15 Connecting pyrometer with supply and display / indicator
Power Supply
Display /
Indicator
+
_
+
_
White
Brown
4....20 mA
T3-250PL/T3-450PL
Table 2 : Color code
COLOR
INDICATION
DESCRIPTION
White
+24 VDC
Power Supply
Brown
Ground (Power Supply)
Black
Shield
Orange
TXD
TTL Communication
Red
RXD
Blue
Ground (Communication)
Green
+5 VDC to +25 VDC
Laser ON /OFF
Yellow
Ground (Laser)
Note : Each Ground is Different, Don't Make Common
3.5.5 Power ON Pyrometer
1. Connect the 7-core (7 core + Shield(Black)) cable connector (Supplied with pyrometer) with pyrometer 7-pin
binder connector given at the back side of pyrometer.
2. Connect the 7-core (7 core + Shield(Black)) cable supply wire with +24V DC as given in table above.
3. Connect remaining wires as per your requirement (details given in table above).
4. Provide insulation for not used end points of 7-core (7 core + Shield(Black)) cable.
5. Now, the pyrometer can be switch ON.
Yellow
Orange
Blue
Red White
Brown
Green Yellow
Orange Blue
Red
White
Brown
Green
Female Connector Male Connector
3.5.4 Seven Pin Binder Connector
Fig. 16 Seven Pin Binder Connector

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Fig. 19 Temperature Indicator
(Reference no: 9000-01)
3.5.9 Display Instrument
To display the measured temperature 7 segment digital
indicator is used. Device has following specifications:
Power supply I/P : 100 to 240 V, AC/DC
Analog I/P : 4….20 mA
Retransmission : 4….20 mA
Power supply O/P : 24V, DC
Display : 4 Digits
Alarm : 2
Fig. 18 Pyrometer to PC Connection
3.5.8 Connecting Pyrometer with PC
nd rd
In order to connect pyrometers with computer orange wire should be connected to 2 pin, red wire to 3
th
pin and blue wire to 4 pin of infralink USB interface.
Computer
Blue
Orange
AST Pyrometer
“Infralink”
USB Interface
Red
2
3
4
3.5.6 Emissivity Settings of Pyrometer
The exact emissivity should be known to measure accurate temperature of the object. The emissivity is the
ratio between the level of radiation from an object and level of radiation from a black body at the same
temperature. Different material have different emissivity ranging from 0.01 to 1.00(or 0% to 100%). Material
which reflect more radiation have a lower emissivity and if the material is acting like a black body than the value of
emissivity will be Ɛ = 1.00 means the material absorb all the incoming radiations.
Factory Settings:
Ɛ = 1.00 (Switch Setting :00)
Example to set emissivity on signal processor
adjust the emissivity
shown in the example. Emissivity can be
adjusted between 0.01 & 1.00 in increments
of 0.01.
Ɛ, by both switches as
0
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
Ɛ = 1.00 or 100%
0
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
Ɛ = 0.65 or 65%
Note : The settings 00 read as Ɛ=1.00 or 100%.
The pyrometer can communicate with PC using Infralink USB interface.
Fig. 17 Infralink USB interface
)(Reference no: 9000-07
3.5.7 InfraLink USB Interface (With PC software)
1
2
3
4

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Chapter - 4
Software Installation
Using AST software(Infrasoft) user can set all the parameters like response time, clear time, communication
mode. This software provide all necessary information about pyrometer.
4.1 Installation
Install the pyrometer software using the installation guide file on CD ROM & restart your PC as per guidelines
provided for installation. After installation of the software; Double click the application. It will open the screen of
software.
4.2 Parameters in main screen
4.2.1 Communication
Communication between the AST pyrometer and
the software is implemented via a infralink USB interface.
This enables the acquisition and recording of data, as well
as the transfer of commands from the software application
to the AST pyrometer. Communication can be done by
clicking on “Communication panel" and select correct COM
Port address where pyrometer is connected. Also user has
to select address of the pyrometer(Example: Default 01/
printed on the pyrometer sticker). Then click on CONNECT
Button.

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(A) Response time The desired response time can be chosen in
the panel Parameter by clicking the appropriate list box (as per
the values available in the drop box of response time from
60msec. to 10sec.). This parameter is use to set the analog
response time of pyrometer.
(B) Sub Range User can change the sub range of pyrometer in
the panel Parameter. Sub range must be within the basic range
of pyrometer, the minimum span between higher & lower range
is 51. Analog output will be automatically set according to the
sub-range by hitting "TAB" button.
(C)Unit User can change the measuring unit of temperature
from “Centigrade" to “Fahrenheit" and vice versa.
(D)Clear time (tCL) This feature is particularly useful when
object temperature is not uniform across its dimension or the
pyrometer is not constantly viewing an object to be measured.
There are three options available in this function :
1. OFF
2. Peak
3. Valley
OFF : At clear time “OFF” the maximum value storage is
switched off and only real time values are measured.
4.2.2 Temperature
It shows the temperature measured by the pyrometer
4.2.3 Parameter Setting
All user selectable device parameters can be set by using the software in the Panel "Parameter"
For communication of multiple pyrometers, select different com port and address.

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If the peak picker is switched on, the highest last temperature value will always be displayed and stored. As such, it
may be beneficial to periodically clear and reset the stored values in order to obtain new temperature readings & it
will reset whenever the pyrometer goes outer(below sub range begin(lower)) the measuring range of temperature.
Valley : This function works similar to peak picker, except that it will search the signal for a minimum value & it will
reset whenever the pyrometer goes outer(above sub range end(upper)) the measuring range of temperature.
4.2.4 Device information
Pyrometer specific information will be displayed in the Info Panel
This screen shows the Model, basic range, serial number, version, Head
temperature, internal temperature, working distance, spot size-apperture.
4.2.5 Record
Record is for continuous data logging. It records the measured temperature, emissivity with current date &
time.To start data logging click on start button. If user wants to record emissivity, click on record emissivity button.
After Clicking Start button window appears where user can specify the file name & location.
Peak-Picker:
Temperature
Sub Range
End (Upper)
Real Time Measured Value
Display Temperature
Temperature
Sub Range
End (Upper)
(E) Emissivity settings This parameter is not adjustable by software. This can be manually adjusted in device itself by
using rotary switches as per requirement. For manual settings of emissivity of device refer section 3.5.5. The
emissivity value which is manually set by rotary switches will be shown in software.
Sub Range
Begin (Lower)
Real Time Measured Value
Display Temperature
TemperatureTemperature
Sub Range
Begin (Lower)

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If user wants file in Spreadsheet format, user can export by choosing Excel Spreadsheet in file menu.
To record emissivity, click on Record Emissivity button.
Record will be saved as .txt format and the name of file will be user define.

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To see previous record open the file by clicking on menu File open.
Screen containing historical trend & historical data will appear.
File will be stored in .xls format named as “export”. This “export.xls” file will be saved where the software is installed.

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Note:
After connecting the pyrometer right click on the graph screen and choose "Set to default" option from pop-up
menu.
Temperature graph of connected pyrometer is displayed on right side of the screen. This shows the measured
temperature corresponding to the time.