AST A250C PL User manual

AST A250C PL/TL
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
....................................................................................................................... 1
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

2
Chapter-2
Introduction
AST A250C PL/TL 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 Application, Range and Working Principle
The digital AST A250C PL/TL 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 350°C to 1350°C.
AST A250C PL/TL 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 A250C PL/TL has a fast response time of 100msec. Pyrometer have RS-232, RS-485 & Bluetooth 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.

3
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 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

4
2.2 Technical Specifications
þ
Standard Item supplied with :- USB cable
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 A250C PL/TL
AST pyrometer
Model A250C PL/TL
Temperature Range
(Analog sub-range adjustable)
Spectral Range
Photodetector Type
Distance to Spot Size Ratio
Emissivity Slope (ε1 / ε2)
Response Time
Accuracy
Repeatability
Sighting Options
Analog Output
Digital Output
Operating Temp. Range
Storage Temp. Range
Adjustable Parameters and Features via Software
350°C….1000°C
450°C….1350°C
1.5/1.6 µm
InGaAs/InGaAs
100:1 (350°C….1000°C)
200:1 (450°C….1350°C)
0.75…1.25 slope adjustable (Two color mode)
100 msec adjustable upto 10 sec
± 1.0% of the measured value + 1°C
(The instrument must be at a constant ambient temperature for a
minimum of 30min)
0.5% of reading in °C + 1°C
Laser Pilot Light(PL) / Through The Lens (TL)
Bluetooth
RS-232/RS-485 (User selectable)
*At a time only one digital output possible
0°C…….70°C
0°C…....200°C (With water cooling jacket)
-20°C….70°C
Emissivity, Emissivity Slope, Response Time, Clear Time( Peak Picker), Analog Output, Analog
Scale(Sub range),Sensor type (Switches b\w 2-color or single color), Switch off level, Unit Of
Temperature(°C/°F), Communication mode(Comm.mode), Record feature etc
0-20mA, 4-20mA, 0-10V (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
<1 m watt
IP65
Stainless Steel
Power supply,*Digital output and Analog output are galvanically islolated against each other
* Not applicable for USB 2.0 digital output
10-95%, Non-Condensing Conditions
600g
Dia= Ø 49.5 mm; Length=118mm
Emissivity (ε) 0.1….1.0 adjustable (Single color mode)
Note: - After power supply initialization, keep pyrometer under stable temperature condition for 30-35 minutes for to get above
stated accuracy.
Laser should be used only for targeting purpose. In normal measuring laser should be turned off to get correct measurements.
Dimensions
Binder
Connector
AST A250C PL
14.00 mm
Ø49.50mm
118.00 mm
34.50 mm
Ø48.00 mm
Binder
Connector
AST A250C TL
14.00 mm
Ø 25.00 mm
11.00 mm
199.00 mm
47.50 mm
34.50 mm
118.00mm
Ø49.50mm

5
(A) If WD = ∞
AST A250C (350° to 1350°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 distances
WD (mm)
Spot Sizes (mm)
350
1000
2500
5000
1.75
5
12.5
25
450° - 1350°C
(FOV) 200:1
3.5
10
25
50
350° - 1000°C
(FOV) 100:1
Infinite (∞)5 (min.)
8 (min.)
Aperture (A) 5 mm
7 mm
500 2.5
5
700 3.5
7
1500 7.5
15
2000 10
20
3000 15
30

6
(B)
distance should be calculated. For example, if factory made working distance is 1000mm & pyrometer is AST A250C
(350° - 1350°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)

7
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

8
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.

9
3.3 Location selection
Qualified operating personnel 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.
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, it can be fastened 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.

10
Fig. 6
(Reference no: 8000-04)
Air Purge Unit
ŸAir pressure : < 0.5 bar
ŸAir consumption : 2...3 m³/h
ŸMetal : Aluminium
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: 8000-02 (for PL)
8000-06 (for TL))
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
Fig. 8 Mounting Clamp
(Reference no: 8000-05)
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.

11
3.5 Electrical Installation
Fig. 12 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
Fig. 11 12-Core Cable
(Reference no: 7002-02)
3.5.1 Power Supply
3.4.5 Combination of Accessoruies
Fig. 9 Adjustable Mounting Stand + L Clamp
+ Water cooling jacket with air purge
(Reference no: 8000-02 or 8000-06 + 8000-07)
Fig. 10 Air purge unit + Mounting Clamp +
Pyrometer
(Reference no: 8000-04 + 8000-05)
Adjustable
mounting
stand
Cooling Jacket
L Clamp
Water inlet/outlet
Air purge
Mounting Clamp
Pyrometer
Air Purge Unit
3.5.2 Connector pin assignment on the back of the pyrometer
For connecting pyrometer with computer via connector pin (on the back of pyrometer) connection diagram is
shown as under .Different colors and their indication is also shown in the table 2. So connections need to be done
according to color, indication, used for particular purpose as in the table2.
RS-232 Connection
Pink
Blue
Black
Ref. No.: 9000-01
Temperature Indicator
230V, AC
AST 12-core cable
AST Pyrometer with
Digital Output RS-232
White
Red
Violet
Yellow
GND
+24 V DC
20
4-20 mA(+)
17
(-)
9
10
Female
RS-232 Connector
Computer
AST Digital Cable
Fig. 13 Connecting pyrometer (RS-232 Converted) with computer

12
Fig. 14 12-pin Binder connector Fig. 15 RS-232 communication connection
Male Female
L
C
BA
J
K
G
H
M
F
E
D
LC
J
B
A
K
G
H
M
FE
D
D - Type 9 pin Female
Connector
LC
J
B
A
K
G
H
M
FE
D8
3
7
2
4
9
6
1
5
RxD
DGND
TxD
H
Pin
A
G
C
D
F
H
M
J
K
B
Colour
Red
White
Blue
Pink
Black
Yellow
Violet
Brown
Green
Yellow
Grey
Indication
+ 24 V DC In
Ground
TxD (RS-232) / D- (RS-485)
RxD (RS-232) / D+ (RS-485)
RS-232 communication
(-) 4-20mA / 0-20mA
(+) 4-20mA / 0-20mA
Short / Open both wires for laser
ON/OFF
- (0-10V)
+ (0-10V)
Used for
Power supply
RS-232/ communicationRS-485
Analog current output
Laser ON/OFF
Analog voltage output
E Blue-Yellow N/A
L Red-Grey N/A Not used
Table 2 : Color code & Pin specification for pyrometer connections
3.3.2
When pyrometer is connected to USB 2.0 cable, it is powered through USB 2.0. At this stage only USB 2.0
output is provided. For Analog output and Laser to work DC supply (+24V DC) must given to pyrometer.
While USB 2.0 is connected RS-232 / RS-485 communication is not possible. LED light indicates USB 2.0
operation.
USB 2.0 Connection:
Note: If user requires IP65, then USB 2.0 cap must be screw fixed at the back.
Open screw for USB 2.0
LED Light

13
3.5.3 Power ON Pyrometer
1. Connect the 12-core cable (Supplied with pyrometer) with pyrometer 12-pin binder connector given at the
back side of pyrometer.
2. Connect the 12-core 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 12-core cable.
5. Now, the pyrometer can be switch ON.
3.5.4 Converter RS-232 ↔ RS-485
The pyrometer can communicate with PC using RS-232 or RS-485.
RS-232 is used only for short distances.
RS-485 is well suited for long distance transmission. Standard on PC
is RS-232, so a converter is used which converts RS-485 to RS-232.
9 8 7 6
5432 1
9876
5
4
3
21
Fig. 19 Serial Communication Cable Male/Female
(RS-232 Communication Cable)
Female
RS-232 Connector
Male
RS-232 Connector
Fig. 16 Converter RS-232 ↔ RS-485
9000-03)(Reference no:
Fig. 17 RS-485 to RS-232 Connection
Ref. No.: 9000-01
Temperature Indicator
230V, AC
AST 12-core cable
AST Pyrometer with
Digital Output RS-485
White
Red
Violet
Yellow
GND
+24 V DC
20
4-20 mA(+) 17
(-)
9
10 1
2
3
4
5
Earth
D+
D-
Pink
Blue
5 4 3 2 1
9876
Female
RS-232 Connector
Ref. No.: 9000-03
Female
RS-232 Connector
*Serial Communication
Cable Male/Female
(RS-232 Communication
Cable)
Computer
Male
RS-232 Connector
Fig. 18 RS-232 to RS-485 to RS-232 Connection
Ref. No.: 9000-01
Temperature Indicator
230V, AC
AST 12-core cable
White
Red
Violet
Yellow
GND
+24 V DC
20
4-20 mA
17
(-)
9
10
Pink
Blue
Black
(+)
AST Pyrometer with
Digital Output RS-232
1
2
3
4
5
5 4 3 2 1
9876
Female
RS-232 Connector
Ref. No.: 9000-03
*Serial Communication
Cable Male/Female
(RS-232 Communication
Cable)
5
4
3
2
1
98
7
6
Female
RS-232 Connector
Ref. No.: 9000-03
1
2
3
4
5D-
D+
Earth
230 V, AC
Male
RS-232 Connector
Female
RS-232
Connector
Computer
Male
RS-232
Connector

14
Fig. 21 Temperature Indicator
(Reference no: 9000-01)
Fig. 22 Display & Parameterizer P-
(Reference no: 9001-01)
120
3.5.5 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
3.5.6 Display & Parameterizer
AST P-120 is a high precision LED indicator for non contact
temperature measurement. With indication of measured
temperature user can easily parameterize a connected AST digital
pyrometer without any PC.
Device has following specification:
Power supply : 100 – 240V, AC or 24V, DC
DC analog O/P : 0-20 mA or 4-20 mA
Digital interface : RS-232 or RS-485
Pilot light : Pilot light On/Off with keys
Fig. 20 Multi-Pyrometer Connection
Note: For Multiple Pyrometer Communication,
Each pyrometer must have different address.
AST 12-core cable
AST Pyrometer with
Digital Output RS-485
Ref. No.: 9000-01
Temperature Indicator
230V, AC
White
Red
Violet
Yellow
GND
+24 VDC
20
4-20 mA
17
(-)
9
10
(+)
AST 12-core cable
AST Pyrometer with
Digital Output RS-485
Ref. No.: 9000-01
Temperature Indicator
230V, AC
White
Red
Violet
Yellow
GND
+24 VDC
20
4-20 mA
17
(-)
9
10
(+)
Pink
Blue
Pink
Blue
Ref. No.: 9000-01
Temperature Indicator
230V, AC
AST 12-core cable
AST Pyrometer with
Digital Output RS-485
White
Red
Violet
Yellow
GND
+24 VDC
20
4-20 mA(+) 17
(-)
9
10 1
2
3
4
5
Earth
D+
D-
Pink
Blue
5 4 3 2 1
9 8 7 6
Female
RS-232 Connector
Ref. No.: 9000-03
Female
RS-232
Connector
*Serial Communication
Cable Male/Female
Computer
Male
RS-232
Connector
3.5.4 Connecting Multiple Pyrometers
In order to connect multiple pyrometers (Multiple pyrometer
communication) to computer each pyrometer must have digital
output RS-485 converted. Each pyrometer should be assigned a
different address. For connection assessment have a look on the
diagram below

Chapter - 4
Software Installation
The provided AST software “InfraSoft” offers digital PC interface RS-232 RS-485. Using this software we can
set all the parameters like response time, analog scale, emissivity, 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 cable connected
between the pyrometer and the PC serial port. 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)Emissivity settings The emissivity can be set by clicking on
"Parameters” and select or type in the desired emissivity directly
in the description field. The emissivity value will be transferred
to pyrometer by hitting the "TAB " button.
(B)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). This
parameter is use to set the analog response time of pyrometer.
(C)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.
(D)Sensor Type It shows pyrometer sensor type. User can
change sensor type from two color to single color and vice versa
(only applicable with two color pyrometer).
(E)Switch off level% ( for two color pyrometer) The switch of
level is the function that is used to avoid measurement errors
caused by signals, which are too low. Although factory default is
set to 15 %, the switch off limit can be adjusted between 2 and
50%.
(F)Unit User can change the measuring unit of temperature from
“Centigrade" to “Fahrenheit" and vice versa.
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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(G) Peak Picker Setting Three Pickers are available in Pickers setting menu
(Auto, tCL, Smart) & user can switch on any as per requirement, one at a time.
(G1) Auto “Auto” mode is used for discontinuous measuring task, such as
object being transported on a conveyer belt in such a case the maximum
value for each object has to be indicated. when the object passes the
measuring beam of the pyrometer, the maximum value is stored until a new
hot object appears in the measuring beam. The temperature which has to
be recognized as “hot” is defined by the low limit of the adjusted sub range. The stored maximum value will be
deleted when the temperature of the new hot object exceeds the low limit “from” of the sub range by at least
1°C. If a lower limit is not entered, the maximum value storage will be deleted whenever the low level of the full
measuring has been exceeded.
(G2) Clear time (tCL) 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.
Example : If we set the tCL as “6 sec” the highest last temperature value will be display for 6.0 sec to 12 sec then it
capture next pick.
Clear Time 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. The peak picker works on two buffer memory to
find maximum value over a defined interval. With the first memory, the highest measured value is held and is
deleted alternately in the time interval set (clear time). The other memory retains the maximum value throughout
the next time interval. The disadvantages of fluctuations in the display with the clock frequency are thereby
eliminated.
The following setting are possible :
OFF : At clear time “OFF” the maximum value storage is switched off and only momentary values are measured.
tCL (10msec...25sec) : Clear Time tCL can be set between 10msec and 25sec. When set, estimates the maximum
values and holds it in two buffer memory. After the entered time, the storage will be deleted.
Note:
The maximum value storage coincides with adjustments made to response time. Therefore:
(I) Clear time<= the adjusted response time is useless
(ii) Clear times must be at least 5 times longer than the response time.
(iii) Only maxima with full maximum value can be recorded, which appear at least 5 times longer than response
time.
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(G3) Smart If the smart picker is switched on, the highest last temperature value will always be displayed and
stored. 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.
Smart Picker Functions
Smart picker can be turn ON & OFF by using the software. When Peak picker is ON, the peak picker menu is enabled
for setting of the parameters like decay rate function, reset below temperature and peak picker delay.
(I)Decay rate The Decay rate range is 0.00 to 166.66°C/sec. or 0.00
to 300°F/sec. depending upon °F/°C unit’s selection. The slowest
Decay rate is 0 degrees per sec. This feature helps to eliminate
erratic measurements and allows the peaked value to decay down
to lower process temperature values as they occur. Decay rate is set
to retain peak measured temperature value and ignore momentary
decreases in measured temperature.
(ll)Delay Time This function set the delay time in sec. before peak
picker function starts. The delay time is selectable in the range 0.02
to 10.00 sec. Zero (0) turns delay time OFF. This function is used to
delay the start of peaking action for upto 10 sec. following the
detection of leading edge of a new target.
Temp
Time
Delay Time (sec.)
Temp
Time
Without RBT RBT with Decay Rate
Temp
Time
RBT
Outer
with Peak Picker
Current Measuring
Value
(lll) Reset Below Temperature(RBT) The user can set RBT within the limit of pyrometer sub range. This function sets
the temperature above which peak picker action starts. When the target temperature matches or is below the
selected value, the sensor indicates temperature without picking action.
Temp
Time
Without RBT
Temp
Time
RBT
RBT with Decay Rate
Outer
with Peak Picker
Current Measuring
Value
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