AST A450C+ PL/TL/Video User manual

AST A450C+ 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
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 ....................................................................................................................... 6
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 ....................................................................................................................... 14
Setting at the Instruments
4.1 Operation
4.2 Key Descriptions
4.3 Adjustable Parameters
4.4 Other Parameters
5. Chapter - 5 ....................................................................................................................... 18
Software installation
4.1 Installation
4.2 Parameters in main screen
6. Chapter - 6 ....................................................................................................................... 25
Maintenance
7. Chapter -7 ....................................................................................................................... 26
Serial communication protocol
8. Appendix B ....................................................................................................................... 31
9. Appendix C ....................................................................................................................... 33
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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

Chapter - 2
Introduction
AST A450C+ PL/TL/Video is digital two color pyrometer which uses ratio of two adjacent wavelengths for
temperature measurement to target object. They 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 A450C+ PL/TL/Video pyrometers are especially designed for industrial purposes. They are suitable for
high temperature measurement ranging from 600°C to 2500°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 A450C+ PL/TL/Video have a fast response time of 20msec. The Pyrometer provided 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 AST A450C+ PL/TL/Video pyrometers are suitable for industrial purpose due to following advantages:
Ÿ Measurement of temperature is not affected by emissivity of object.
Ÿ Measurement of object temperature is possible where dust, moisture & other contaminants are present in
surrounding environment.
Ÿ The measuring object can be smaller than spot size.
Ÿ The pyrometer can be switched between 1-colour & 2-colour mode.
Temperature measurement can be taken in any of the following modes:
1. Single colour mode.
2. Two colour mode.
Single Colour Mode: Single colour mode is best for measuring the temperature of target object in areas where no
sighting obstacle is present between the target object and the pyrometer. Sighting obstacle can be any solid item,
gaseous particles, smoke and dust etc. This mode is very useful where target object completely fills the spot size.
Two colour Mode: The basic concept of two colour mode is temperature measurement of the target object is done
by the ratio of two separate and overlapping of infrared bands. Two sensors are used in this type of pyrometer.
2.2 Operational Theory for 2-colour sensors
Accurate and repeatable temperature measurement is possible with the two colour ratio technology that does not
depend on emissivity of object. Basically a 2 colour sensor determines temperature from the ratio of radiated
energies in two separate wavelength bands (2 different colours).
Advantages of two colour pyrometer over single colour pyrometer which makes it suitable for industrial usage are as
follows:
ŸMeasurement of temperature is not affected by emissivity of object.
ŸMeasurement of object temperature is possible where dust, moisture and other contaminants are present
in surrounding environment.
ŸThe measuring object can be smaller than the spot size.
ŸThe pyrometer can be switched between 1-colour and 2-colour mode.
ŸThe spot is partially blocked or obscured.
Product Key Features,
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2.2.1 Measurement of temperature is not affected by low or changing emissivity values
If the value of emissivity in both colours (wavelengths) are same as like for the black body (where emissivity =1.0)
or for grey body where emissivity is less than 1.0 but a constant number and the emissivity of the target would not
get influenced. But actually grey body does not exist in nature. The emissivity of all real objects changes with
temperature and wavelength at variable degrees, depending on the material. 2 colour pyrometer is more accurate
than single colour pyrometer when emissivity is uncertain or changing but emissivity should change by same factor
in both wavelength bands. Accuracy of result measurement is dependent on the type of material being measured
and the application for which it is used.
2.2.2 The measuring object is smaller than spot size
If the target object is moving or it is smaller than the spot size, the amount of radiated energy is also reduced. But
the ratio of energies is unaffected and hence the measured temperature remains accurate.
2.2.3 The spot is partially blocked or obscured
The energy emitted from a target is usually reduced when target object is being blocked or some portion of the
optical head is blocked. But the ratio of the energies is not affected and hence the measured temperature remains
extremely accurate.
2 colour pyrometer is better than 1 or single colour in the following conditions:-
ŸWhen path of sight is partially blocked.
ŸWhen any of the sensors is subjected to dirt and/ or moisture, smoke accumulating on the lens surface.
ŸWhen dirt, smoke & moisture is present in the atmosphere between the sensor and target.
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. Two color pyrometer involves
measuring thermal radiance at two different wavelengths and inferring the temperature from the ratio of these
spectral radiances. Radiance ratio thermometers can be significantly more accurate than single band
thermometers in many applications.
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.
üPreheating üMelting
üAnnealing üSintering
üTempering üSoldering
üWelding üRolling
üForging üBrazing
üHardening üNormalizing
üAST pyrometer üManual
üConnection cable 12-core (length - 5 m) üCertificate of calibration
üAST software CD
Standard Item supplied with AST A450C+ PL/TL/Video
The applications in which AST pyrometers can be used are

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2.2 Technical Specifications
Model A450C+ 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
Adjustable Parameters and Features via Software/
Keypad
0.1….1.0 adjustable (for Single Colo)r
20 msec adjustable upto 10 sec
± 0.5% 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….1600°C
800°C.... 2500°C
0.7 µm...... 1.15µm
Si/Si
150:1 (600°C....1600°C)
300:1 (800°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
Relay Output Relay output with hysteresis 60V DC / 42V AC RMS, 0.4A
Model A450C+ PL/TL/Video
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
Dimensions
Fig. 1 Dimensions of Pyrometers
Emissivity Slop 0.7 to 1.25 for two color

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475 3.20 1.60
Spot Sizes(mm)
Focused working distances WD (mm)
500
700
800
1000
1500
2000
3000
5000
A450C+
800°C - 2500°C
(300:1)
3.40
4.70
5.40
6.70
10.00
13.40
20.00
33.40
A450C+
600°C - 1600°C
(150:1)
1.70
2.40
2.70
3.40
5.00
6.70
10.00
16.70
2.4 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
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
9000 60.00 30.00
13.60
12.70
8.50
7.20
5.50
3.40
2.30
1.30
0.50
0
Fig. 2 Adjusting Measuring Distance

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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 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
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.

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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.
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.