AST A250+ PL/TL/Video BT User manual

AST - Accurate Sensing Technologies
188A, B-169 (Part), B-188 (A),
Road No. - 5, Mewar Industrial Area, Udaipur - 313003 (Rajasthan) INDIA
Phone : [phone]
Email : [e-mail]
AST A250+/A450+ PL/TL/Video BT
USER MANUAL
Non-contact Infrared Pyrometers
We measure accurate temperature in extreme conditions
Accurate Sensing Technologies

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 ....................................................................................................................... 13
Setting at the Instruments
4.1 Operation
4.2 Key Descriptions
4.3 Adjustable Parameters
4.4 Other Parameters
5. Chapter - 5 ....................................................................................................................... 17
Software installation
4.1 Installation
4.2 Parameters in main screen
6. Chapter - 6 ....................................................................................................................... 24
Android Application Software
6.1 Installation Process
6.2 Communication
6.3 Operation
6.4 Datalogging & Online graph
7. Chapter -7 ....................................................................................................................... 28
Maintenance
8. Chapter - 8 ....................................................................................................................... 29
Serial communication protocol
9. Appendix B ....................................................................................................................... 34
10. Appendix C ....................................................................................................................... 35
....................................................................................................................... 1
Accurate Sensing Technologies

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
1
Accurate Sensing Technologies

Chapter - 2
Introduction
AST A250+/A450+ PL/TL/Video BT 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 A250+/A450+ PL/TL/Video BT pyrometers are especially designed for industrial purposes. They are
suitable for high temperature measurement ranging from 210°C to 3000°C.
These pyrometers have solid body in stainless steel housing, which provides high operation safety even in rough
industrial environment, and large variety of focusable optics which can be easily used in all industrial areas.
These pyrometers have OLED display which shows temperature and provides menu selection via
parameterizaion keys. AST A250+/A450+ PL/TL/Video BT have fast response time of 2msec. The RS-485 for long
distance communication between pyrometer & PC software Infrasoft. Response time, emissivity, sub-range and
peak picker selection can be preset ex-works or 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 microprocessor. AST
A250+/A450+ PL/TL/Video BT work in 4-wire technology.
The applications in which AST pyrometers can be used are
üPreheating
üAnnealing
üTempering
üWelding
üForging
üHardening
üMelting
üSintering
üSoldering
üRolling
üBrazing
üNormalizing
Product Key Features,
Standard Item supplied with AST A250+/A450+ PL/TL/Video BT
üAST pyrometer
üConnection cable 12-core (length - 5 m)
üAST software CD
üManual
üCertificate of calibration
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2.2 Technical Specifications
Model A250+ PL/TL/Video BT A450+ PL/TL/Video BT
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) / Through The 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, Clear Time(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/TL models
Max 3.5 watt - Video models
<1 m watt (Only PL Model)
IP65
Stainless Steel
Power supply, Digital output and Analog 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 / 42V AC RMS, 0.4A
Model A450C+ PL/TL/Video BT
Pixles
Video Format
Video Output
Impedance
Image Sensor
Maximum Analog 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
farther the measured object from the pyrometer, the larger the area that will be measured.
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
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4
Adjusting the required measuring distance:-
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
correct measuring distance. For fixing the optics has to be turned clock
wise.
Adjusting the measuring distance with the help of the table:-
The table mentions the minimum and maximum measuring
distance for each optics as well as serval other values. The length “L”
can we measured with a caliper. This length "L" can reach max. upto 14
mm.
Adjusting the measuring distance with help of the thru lens view
finder:-
The focusable optics is correctly adjusted to the required
distance, if the measuring object is shown as a sharp image in the view
finder . A circle marks the position of the measuring spot.
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
L
Length
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 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 0.7 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, Ɛ is 1 while any real object would have Ɛ 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 by pyrometer and adjust emissivity
settings in pyrometer 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
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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
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 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.

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.
With through the lens sighting (TL)
In case of through the lens sighting a reticule circle marks the position of the measuring spot. This circle is
true-sided and parallax-free.
With composite Video output
In case of video output a reticle circle on the center of camera view marks the positioning of the measuring
spot. The camera view shows real temperature of the target and reticle on the center of the view.
Note: The laser spot (PL) / reticule circle (TL) 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, pyrometer can be mounted correctly in the mounting clamp.
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: 8500-05)
Air Purge Unit
ŸAir pressure : < 0.5 bar
ŸAir consumption : 2...3 m³/h
ŸMetal : Aluminium
ŸWeight : 0.5 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 : 3.0 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
(Reference no: 8500-09
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.)
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
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Fig. 8 Mounting Clamp
(Reference no: 8500-04)
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. 9 Mounting Flange
(Reference no: 8500-07)
3.4.5 Mounting Flange