AST A250C+ FO PL User manual

AST A250C+ FO PL
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 ....................................................................................................................... 17
Software installation
4.1 Installation
4.2 Parameters in main screen
6. Chapter - 6 ....................................................................................................................... 24
Maintenance
7. Chapter -7 ....................................................................................................................... 25
Serial communication protocol
8. Appendix B ....................................................................................................................... 30
9. Appendix C ....................................................................................................................... 32
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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 A250C+ FO PL 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 A250C+ FO PL pyrometers are especially designed for industrial purposes. They are suitable for high
temperature measurement ranging from 350°C to 1350°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 A250C+ FO PL 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 A250C+ FO PL pyrometers are suitable for industrial purpose due to following advantages :
lMeasurement of temperature is not affected by emissivity of object.
lMeasurement of object temperature is possible where dust, moisture & other contaminants are present in
surrounding environment.
lThe measuring object can be smaller than spot size.
lThe 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:
lMeasurement of temperature is not affected by emissivity of object.
lMeasurement of object temperature is possible where dust, moisture and other contaminants are present
in surrounding environment.
lThe measuring object can be smaller than the spot size.
lThe pyrometer can be switched between 1-colour and 2-colour mode.
lThe 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:-
lWhen path of sight is partially blocked.
lWhen any of the sensors is subjected to dirt and/ or moisture, smoke accumulating on the lens surface.
lWhen 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 and hence known to be work in smart mode.
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 üUSB Grabber Card
Standard Item supplied with AST A250C+ FO PL
The applications in which AST pyrometers can be used are

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2.2 Technical Specifications
Dimensions
Fig. 1 Dimensions of Pyrometers
Model
Temperature Range
(Analog sub-range adjustable)
Spectral Range
Photodetector Type
Distance to Spot Size Ratio
Response Time
Accuracy
Repeatability
Sighting Options
Analog Output
Operating Temp. Range
Storage Temp. Range
Adjustable Parameters and Features via
Software
A250C+ FO PL
350°C - 1000°C
450°C - 1350°C
1.5/1.6 µm
InGaAS/InGaAS
100:1 OH(I)
100:1 OH(lI)
100:1 OH(ll) - Variable
200:1 OH(l)
200:1 OH(ll) -
200:1 OH(ll) - Variable
100 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)
Digital Output RS-485
0°C…….70°C
Optical Head and Fiber Optic Cable upto 250°C
-20°C…70°C
Emissivity, Response Time, Clear Time (Peak Picker), Analog Output, Analog Scale (Sub range), Unit
Of Temperature(°C/°F), Communication mode (Comm. mode), Record feature, Relay set
point & hysteresis, etc.
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 4.0 watt
<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= Ø 56mm; Length=188.5mm
Emissivity (ε) 0.1….1.0 adjustable (Single color mode)
Adjustable Parameters and Features via
Keypad
Emissivity, Response Time, Clear Time (Peak Picker), Analog Output, Analog Scale (Sub range), Unit
Of Temperature(°C/°F), Communication mode (Comm. mode), Relay set point & hysteresis, address,
etc.
Relay output One Relay output with hysteresis 60V DC / 42 AC RMS, 0.4 A
Emissivity Slop (ε1/ )ε20.75….1.25 slop adjustable (Two color mode)
350°C - 1000°C
450°C - 1350°C

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Variable Optics
Working Distance (WD) (mm)
Optical Head Length L (mm)
Optical Pullout P (mm)
Optical Head - ll - V (Variable)
250
78.9
12.5
300
75.75
9.35
400
72.8
6.4
600
70.1
3.7
800
68.8
2.4
1000
68.1
1.7
1500
67.15
0.75
2000
66.7
0.3
2500
66.4
0
Spot Size (mm) AST A250C+ FO PL 1.3 1.5 2.0 3.0 4.0 5.0 7.5 10.0 13.0
10
Aperture
4000
66.7
0.3
5000
66.4
0
28.0 38.0
Variable Optics
Working Distance (WD) (mm)
Optical Head Length L (mm)
Optical Pullout P (mm)
Optical Head - lll - V (Variable)
340
158.7
40.0
400
150.3
31.60
600
136.8
18.1
800
131
12.3
1000
127.8
9.1
1500
123.8
5.10
2000
121.9
3.20
Spot Size (mm) AST A250C+ FO PL 0.80 1.0 1.5 2.0 2.5 3.75 5.0
12
Aperture
3000
120
1.30
5000
118.7
0
7.50 12.5
*All Dimensions in mm
2.4 Optics
The pyrometer measure temperature by receiving heat radiation from the object whose temperature 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 from the pyrometer, the larger the area that will be measured.
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
Fig. 2 Adjusting Measuring Distance
Example of OH(ll) - Variable
Pull Out (P) = 1.7 mm
Optical Head Length (L) = 68.1 mm
SS 5.0 mm
L= 68.1
P=1.7 WD 1000 mm
Example of OH(lll) - Variable
SS 2.5 mm
WD 1000 mm
L= 127.8
P=9.1
Pull Out (P) = 9.1 mm
Optical Head Length (L) = 127.8 mm
*All Dimensions in mm
Optical Head
Optical Head - I
Optical Head - II
120
260
700
90
200
600
4500
Working
Distances (mm)
350°C - 1000°C
450°C - 1350°C
1.2
2.6
7
0.5
1
3
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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.

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Fig. 6
(Reference no: 8500-05)
Air Purge Unit
lAir pressure : < 0.5 bar
lAir consumption : 2...3 m³/h
lMetal : Aluminium
lWeight : 0.5 Kg
lDry, clean air (Oil and dust free)
3.4 Mechanical Accessories
lWater pressure : < 10 bar
lAir pressure : < 0.5 bar
lAir consumption : 2...3 m³/h
lAmbient temperature : < 200°C
lMetal : Stainless steel
lWeight : 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)
lMetal : Stainless Steel
lWeight : 0.9 Kg
Fig. 8 Mounting Clamp
(Reference no: 8500-04)
lMetal : Stainless Steel
lWeight : 0.45 Kg
3.4.4 Mounting Clamp (Pyrometer)
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

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3.6 Electrical Installation
Fig. 18 Power Supply Unit
(Reference no: 9000-02)
24V DC (well stabilized ripple max 50mV).The input power supply is 110/230v AC and output power supply be
24V DC(well stabilized ripple max 50 mV) for pyrometer. 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. 17 12-Core Cable
(Reference no: 7002-02)
3.6.1 Power Supply
3.5 Combination of Accessories
3.4.6 Mounting Plate
Fig. 10 Mounting Plate
(Reference no: 8500-08)
Fig. 12 Pyrometer with Mounting Clamp
Reference No. (8500-04)
Fig. 13 Pyrometer with
Mounting Flange (8500-07) + Air Purge (8500-05)
+ Water Cooling Jacket (8500-09)
Fig. 14 Pyrometer with
Air Purge (8500-05) + Mounting Clamp (8500-04)
Fig. 15 Pyrometer with
Mounting Flange (8500-07) + Air Purge (8500-05) Fig. 16 Pyrometer with
Mounting Clamp (8500-06) + Air Purge (8500-05)
+ Water Cooling Jacket (8500-09)
Mounting
Clamp(Pyrometer)
Pyrometer
Airpurge
Water cooling
Jacket
Mounting Flange
Air Purge
Mounting Clamp
(Water Cooling Jacket)
Mounting
Flange
Air Purge
Air Purge
Mounting
Clamp
(Water Cooling Jacket)
Water Cooling Jacket
Fig. 11 Mounting Clamp (Water Cooling Jacket)
(Reference no: 8500-06)
3.4.7 Mounting Clamp (Water Cooling Jacket)

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Table 2 : Color code & Pin specification for pyrometer connections
3.6.2 Connector pin assignment on the bottom of the pyrometer
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. For connecting pyrometer with computer via
connector pin (on the bottom of pyrometer) connection diagram is shown as under.
Fig. 19 Connecting pyrometer (RS-485 Converted) with computer
RS-485 Connection
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 V DC
19
4-20 mA(+)
20
(-)
12
11
Computer
AST Digital Cable RS-485 to
RS-232/
USB
Converter
Pin
A
G
C
D
F
H
M
J
K
B
Colour
Red
White
Blue
Pink
Black
Yellow
Violet
Brown
Green
Grey
Indication
24 V DC
Ground
D- (RS-485)
D+ (RS-485)
RL1 NC
(-) 4-20mA / 0-20mA
(+) 4-20mA / 0-20mA
Laser 2
RL1-No
Used for
Power supply
RS-485 communication
Analog current output
Laser ON/OFF
E
White co-axial
CVBS GND
LCVBS Signal Analog Video Output with BNC
Laser 1
Relay Terminal
Fig. 20 12-pin Binder connector
Male Female
L
C
BA
J
K
G
H
M
F
E
D
LC
J
B
A
K
G
H
M
FE
D
Note : 1 Male - 12 pin binder connector is present on pyrometer side.
2. Female - 12 pin binder connector is present on 12 core cable side.

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3.6.3 Power ON Pyrometer
1. Connect the 12-core cable with 12-pin connector of pyrometer.
2. Connect supply wire (Red(+), White(-)) of 12 core cable with 24V DC power supply.
3. Connect remaining wires as per your requirement (details given in table 2 above).
4. Provide insulation for not used end points of 12-core cable.
5. Switch ON 24V DC Power Supply, pyrometer is ready for the temperature measurement.
3.6.4 Converter RS-485 to RS-232
The pyrometer can communicate with PC usingr RS-485.
RS-485 is well suited for long distance transmission. Standard on PC is RS-
232/USB, so a converter is used which converts RS-485 to RS-232/USB.
9 8 7 6
5432 1
9876
5
4
3
21
Fig. 23 Serial Communication Cable Male/Female
(RS-232 Communication Cable)
Female
RS-232 Connector
Male
RS-232 Connector
Fig. 21 Converter RS-485 to RS-232
9000-03)(Reference no:
Fig. 22 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
19
4-20 mA(+) 20
(-)
12
11 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

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Fig. 25 Temperature Indicator
(Reference no: 9000-01)
Fig. 26 Display & Parameterizer P-
(Reference no: 9001-01)
120
3.6.6 Display Instrument
To display the measured temperature 7 segment digital
indicator is used. Display temperature according to 4...20mA
analog output. 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
3.6.7 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
Alarm with Hysteresis : 2 Nos.
Fig. 24 Multi-Pyrometer Connection
Note: For 16 number of 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
19
4-20 mA
20
(-)
12
11
(+)
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
19
4-20 mA
20
(-)
12
11
(+)
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
19
4-20 mA(+) 20
(-)
12
11 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
3.6.5 Connecting Multiple Pyrometers
In order to connect multiple pyrometers (Multiple pyrometer
communication) to computer each pyrometer must have digital
output RS-485. Each pyrometer should be assigned a different
address. For connection assessment have a look on the diagram
below
12

Accurate Sensors Technologies
14
Chapter - 4
Setting at the instrument
User can power up the unit by using connection cable at 24V DC input. After power up sensor starts an initializing
routine for some seconds. After this the object temperature is shown in the OLED display.
Note : In TL and Video model laser indication, Red LED and laser ON/OFF switch are not available
4.1 Operation
The programming keys FUNC, UP and DOWN enable the user to set the device on-site. Normally, OLED shows
temperature. To view different parameter FUNC key is pressed repeatedly. To change values of parameters UP &
DOWN keys are used. After changing values in any parameter by UP & DOWN key finally FUNC key should be pressed
to save that value in device. If FUNC key is not pressed after changing parameter value than device will automatically
take the old value & device will start showing temperature. If any key is not pressed for more than 5 sec. than device
will automatically shows the temperature.
4.2 Key Description
Up Key:This key changes the options to the next available value in the upward order.
Down Key :This key changes the options to the next available value in the downward order.
Enter/Function Key :This key is used for various function selection and saving.
Status Indication(GreenLED):Under normal condition green LED glows continuously which indicates pyrometer is
working correctly. If this LED blinks (getting ON & OFF) Indicates something is wrong which may be due to any of the
following reasons
1. Target temperature is above the analog high range of pyrometer or target temperature is below the analog low
range of pyrometer
2. Internal temperature is above ambient temperature high range of pyrometer(70°C) or internal temperature is
below ambient temperature low range of pyrometer(0°C).
OLED Display
Down key
Laser Indication (RED LED)
Laser ON/OFF Key
Up Key
Status Indication
(Green LED)
Enter/Function Key
Fig. 27 For FO PL Model

15
Accurate Sensors Technologies
4.3 Adjustable Parameters
CLR
Color Mode
This is used to change the color mode from single color to two color and vice versa.
ExM
Exposure Mode
This function allows changing the exposure setting mode from manual to auto and vice
versa. When selected manual mode, user can change the exposure time value
manually to adjust the picture quality as per requirement. If selected auto mode, then
exposure time value will be automatically adjusted in accordance with the target
temperature.
ExT
Exposure Value
This function is used to set the exposure value from 0 to 255. User can adjust the
exposure value when manual mode is selected in Exposure Mode parameter.
EMI
Emissivity
This parameter will be shown if Single color mode is selected, it is adjustable from 0.05
to 1.
ESR
Emissivity Ratio
This parameter will be shown if two color mode is selected, it is adjustable from 0.75 to
1.25.
TRANS
Transmittance
Transmittance is a parameter that can compensate for signal loss due to external
windows etc. For example, if the emissivity of the material is 0.6 and the transmittance
of an additional window is 0.9, then the product would be 0.54 which is well inside the
allowed range. This features works only in single color mode.
Its value ranges from 0.01 to 1.0.
The product of transmittance and emissivity (τ x ε) must not be less than 5%.
SP
Set Point
Instrument is equipped with a relay contact controlled by the measuring signal. The
turn on temperature of relay is adjusted within the measuring range. The relay contact
is “OPEN” below the adjusted value, it is “CLOSE” above it
HST
Hysteresis
The relay contact close when temperature exceeds the set point. It opens only if the
temperature falls below a value which consists of set point and the adjusted Hysteresis.
It can be adjusted from 2° to 20°C.
Example: if set point value is 900°C and Hysteresis set to 10. Then relay operation as
below mentioned: 1. Relay contact OPEN below 910°C temperature.
2. Relay contact CLOSE above 910°C temperature.
3. Once relay contact CLOSED than relay contact is OPEN's when temperature falls
below 890°C
ALO
Ana. Sub range Low
Analog sub-range is adjustable within the basic range; user can set lower analog sub-
range here.
AHI
Ana. Sub range
HIGH
User can set the analog sub-range higher value here. Minimum span between lower &
higher value is 50°C
AO
Analog Output
User can select the output from 4…20mA or 0…20mA
UNIT
Temp. Unit
User can select °C or °F unit.
ADD
Sensor Address
For communicating with pyrometer via software users have to give a address. The
address may be 1 to 255.
TAU
Response Time
The response time can be set from 2 msec to 10sec.
SOL
Switch off Level
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%.

Accurate Sensors Technologies
16
PIC
Peak Picker
The Peak picker can be switched ON –OFF by using up down key. If the peak 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 pyrometer is not constantly viewing an object to be measured. Peak
Picker Function: Three Pickers are available in Pickers setting menu (AUTO, TCL,
SMRT) & user can switch on any as per requirement, one at a time.
AUTO
Auto Mode
This function is used to automatically detect the highest peak value and stored, until
the next higher reading measured.
TCL
Clear Time
This function periodically clear and reset the stored peak values in order to obtain
new peak temperature readings. It ranges from 10msec...25sec.
SMRT
Smart Mode
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.
When it is ON, the peak picker menu is enabled for setting of the parameters like
decay rate function, peak picker delay and reset below temperature
DR
Decay Rate
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.
DT
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 up to 10 sec. following the
detection of leading edge of a new target
RBT
Reset Below
Temperature
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.
TIME
Set Date/Time
This parameter is used to set the date and time.
OLED
OFF
TIME
OLED OFF TIME
The User can set OLED OFF time from 1 min. to 30 min. or continue ON. If user select
OFF time as 1 min., then OLED display will be turn OFF after 1 min. (Only display will
turn OFF, Pyrometer is ON.) By pressing any key, OLED will resume again with display.
If user select continue ON option, then OLED display is continues.
IT
Internal
Temperature
It shows the internal temperature of pyrometer
Temp
Time
Without Decay Rate With Decay Rate
Temp
Time
Decay rate in
°C/sec.
Temp
Time
Delay Time (sec.)
Temp
Time
RBT
RBT with Decay Rate
Temp
Time
Without RBT

17
Accurate Sensors Technologies
Chapter - 5
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.
5.1 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.
&
5.2 Parameters in main screen
5.2.1 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.

Accurate Sensors Technologies
18
(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.
5.2.2 Temperature
It shows the temperature measured by the pyrometer
5.2.3 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.