AST A450C PL/TL BT User manual

AST A450C PL/TL BT
USER MANUAL
A S Tccurate ensors echnologies
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 ....................................................................................................................... 7
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 ....................................................................................................................... 15
Software installation
4.1 Installation
4.2 Parameters in main screen
5. Chapter - 5 ....................................................................................................................... 22
Android Application Software
5.1 Installation Process
5.2 Communication
5.3 Operation
5.4 Datalogging & Online graph
6. Chapter - 6 ....................................................................................................................... 26
Calculate Spot size
7. Chapter - 7 ....................................................................................................................... 27
Maintenance
8. Chapter - 8 ....................................................................................................................... 28
Serial communication protocol
9. Appendix B ....................................................................................................................... 33
10. Appendix C ....................................................................................................................... 34
....................................................................................................................... 1

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

2
Chapter-2
Introduction
AST A450C PL/TL BT are specially designed highly accurate digital two-color pyrometers to provide high
performance and low maintenance of non contact temperature measurement in demanding industrial environment.
2.1 Product Key Features, Range, Working Principle and Applications
The digital AST A450C PL/TL BT pyrometer use ratio method in which 2 adjacent wave lengths are used for
measurement of temperature. They are suitable for high temperature measurement ranging from 600°C to 2500°C.
AST A450C PL/TL BT pyrometers are suitable for industrial purpose due to following advantages:
ŸMeasurement of temperature is not affected by emissivity of object.
ŸMeasurement of object temperature is possible where dust, moisture & other contaminants are present in
surrounding environment.
ŸThe measuring object can be smaller than spot size.
ŸThe pyrometer can be switched between 1-colour & 2-colour mode.
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 A450C PL/TL BT has a fast response time of 20msec. Pyrometer have RS-232, RS-485 & Bluetooth V2.0
outputs. Response time, emissivity, sub range and peak picker selection can be preset ex works or adjusted 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. 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.
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.

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.
The applications in which AST pyrometers can be used are:
ŸInduction heating
ŸAnnealing
ŸWelding
ŸForging
ŸSintering
ŸMelting
ŸRolling mills
ŸRotary kilns
ŸCrystal growing
3

4
2.2 Technical Specifications
Standard Item supplied with :-
þ þ AST software CD
þ þ
Connection cable 12-core (length - 5 m) Manual
þ þ
Digital cable 3-core (length - 1.5 m) Certificate of calibration
AST A450C PL/TL BT
AST pyrometer
Measured Temperature
Ranges
(Analog sub range adjustable)
Spectral Range
Emissivity Range
Model AST A450C PL/TL BT
600°C - 1600°C
800°C - 2500°C
0.7....1.15 µm
0.1….1 adjustable (for single color mode)
Emissivity slop 0.75….1.25 slop adjustable (for two color mode)
Response Time
Accuracy
20msec. Adjustable upto 10 sec
± 0.5% +1°C of measured value
Distance to Spot Size Ratio
Digital Output
Analog Output
Bluetooth V2.0, RS-232 & RS-485(User Selectable)
at a time only one digital output possible
4-20 mA or 0-20mA or 0-10 V User selectable
Sighting Laser pilot light (PL) or through the lens sighting (TL)
Operating temperature range 0°C......70°C, 0°C......200°C(with cooling jacket)
Protection class IP 65
Isolation Power supply and digital output and analog output are galvanically
isolated against each other
Operating humidity
Dimensions/Weight
10 - 95% non condensing conditions
Dia. = Ø49.5 mm; Length = 118 mm / Weight = 0.6 kg
(600° - 1600°C)
(800° - 2500°C)
100 : 1
200 : 1
Power Supply 12V to 28V DC with reverse voltage protection
Photodetector Type Si / Si
Repeatability 0.1% of reading in °C +1°C
Power Consumption Max. 2.5 Watt.
Dimensions
Binder
Connector
AST A450C PL
14.00 mm
Ø49.50mm
118.00 mm
34.50 mm
Ø48.00 mm
Binder
Connector
AST A450C TL
14.00 mm
Ø 25.00 mm
11.00 mm
199.00 mm
47.50 mm
34.50 mm
118.00mm
Ø49.50mm

(A) If WD = ∞
AST A450C (600° to 1600°C) than spot size at 5000mm (5m) can be calculated as
, Then spot size can be calculated with “field of view” (FOV), for example if pyrometer is
Minimum spot
Caution for WD = ∞
2.3 Optics
has to be 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.
The pyrometer measure temperature by receiving heat radiation from the object whose temperature
Some fixed optics focus is as below:-
For Installed spot size calculation, there are two categories of pyrometer, First for (infinite) working distance
& second for fixed working distance.
Both are explained below:
* Manufactured working distance (WD) mentioned on the pyrometer.
∞
Manufactured working
distance WD (mm)
Spot Size (mm)
350
1000
2500
5000
1.75
5
12.5
25
800°C - 2500°C
(FOV) 200:1
3.5
10
25
50
600°C - 1600°C
(FOV) 100:1
Infinite (∞)5 (min.)
8 (min.)
Aperture (A) 4
7
500 2.5
5
700 3.5
7
1500 7.5
15
2000 10
20
3000 15
30
5

6
(B)
distance should be calculated. For example, if factory made working distance is 1000mm & pyrometer is AST A450C
(600° - 1600°C) then spot size is 10mm (as given in table). If user installed this pyrometer at 5000mm then spot size is
not 50mm (as given in table), user should have to calculate as given below method.
If the pyrometer is not installed at manufactured working distance (WD) then spot size at actual installed
Case-I: If installed working distance is greater than manufactured working distance
Case-II: If installed working distance is smaller than manufactured working distance
Fig. 1 Spot size
Where : S= manufactured spot size of pyrometer(mm), A = It shows the value of lens opening (aperture in mm)

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 1000 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; 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
7