optris CTratio 1M Series User manual

Operator‘s Manual
optris®CTratio
1M/ 2M
Fiber Optics Ratio Thermometer

Optris GmbH
Ferdinand-Buisson-Str. 14
13127 Berlin
Germany
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.optris.global

Table of Contents 3-
Table of Contents
Table of Contents .............................................................................................................................................3
1General Information.................................................................................................................................7
1.1 Description ....................................................................................................................................... 7
1.2 Warranty........................................................................................................................................... 9
1.3 Scope of Supply............................................................................................................................... 9
1.4 Maintenance................................................................................................................................... 10
1.5 Safety Note..................................................................................................................................... 10
1.6 Cautions ......................................................................................................................................... 10
1.7 Factory Default Settings................................................................................................................. 11
2Technical Data........................................................................................................................................13
2.1 General Specifications ................................................................................................................... 13
2.2 Electrical Specifications.................................................................................................................. 14
2.3 Measurement Specifications [1M models] ..................................................................................... 15

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2.4 Measurement Specifications [2M models] ..................................................................................... 16
2.5 Optics ............................................................................................................................................. 17
3Mechanical Installation..........................................................................................................................20
3.1 Accessories.................................................................................................................................... 23
3.2 Laser Sighting ................................................................................................................................ 25
4Electrical Installation.............................................................................................................................26
4.1 Cable Connections......................................................................................................................... 26
4.2 Ground Connection ........................................................................................................................ 28
5Outputs and Inputs................................................................................................................................29
5.1 Analog Output ................................................................................................................................ 29
5.2 I/O pins........................................................................................................................................... 30
5.3 Programming Interface................................................................................................................... 31
5.4 Relay Outputs................................................................................................................................. 32
5.5 Alarms ............................................................................................................................................ 33

Table of Contents 5-
6Operating ................................................................................................................................................34
6.1 Sensor Setup.................................................................................................................................. 34
7IRmobile app...........................................................................................................................................38
8Software Ratio Connect ........................................................................................................................40
8.1 Installation ...................................................................................................................................... 40
8.2 Communication Settings ................................................................................................................ 42
8.2.1 Serial Interface........................................................................................................................... 42
8.2.2 Protocol...................................................................................................................................... 42
9Basics of Infrared Thermometry...........................................................................................................43
9.1 The Ratio Principle......................................................................................................................... 44
10 Emissivity ...............................................................................................................................................46
10.1 Definition......................................................................................................................................... 46
10.2 Determination of unknown Emissivity ............................................................................................ 46
10.3 Characteristic Emissivity ................................................................................................................ 47

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10.4 Characteristic Slope Values........................................................................................................... 48
10.5 Determination of unknown Slope values........................................................................................ 48
10.6 Attenuation ..................................................................................................................................... 48
Appendix A –Emissivity Table Metals.........................................................................................................50
Appendix B –Emissivity Table Non Metals.................................................................................................52
Appendix C –Smart Averaging.....................................................................................................................53
Appendix D –Declaration of Conformity .....................................................................................................54

General Information 7-
1 General Information
1.1 Description
Thank you for choosing the optris® CTratio infrared thermometer.
The sensors of the optris CTratio series are noncontact infrared temperature sensors.
They calculate the surface temperature based on the emitted infrared energy of objects. The CTratio can
work in the 1-color-mode as well as in the ratio- or 2-color-mode [►9 Basics of Infrared Thermometry].
The optical sensing head of the CTratio is made of stainless steel (IP65/ NEMA-4 rating) and is connected
via a rugged fiber optics, which is protected by a stainless steel armour, with the sensor electronics (die
casting zinc box).
1-color-mode [1C]
The 1-color-mode is best for measuring the temperature of objects in areas where no sighting obstructions
(solid, gases or dust) exist. The measurement object must fill completely the measurement spot, if the 1-
color-mode is used.
2-color-mode [2C]
In this mode the object temperature will be determined from the ratio of the signal of two separate and
overlapping infrared bands. The 2-color-mode is best for measuring the temperature of objects which are
partially obscured by other objects, openings or viewing windows that reduce energy and by dirt, smoke or
steam in the atmosphere. Another benefit of the 2-color-mode is that the measurement object can be smaller
than the measurement spot, provided the background is cooler than the target [►9.1 The Ratio Principle].

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The CTratio sensing head is a sensitive optical system. Please use only the thread for
mechanical installation.
Avoid abrupt changes of the ambient temperature.
Avoid mechanical violence on the head –this may destroy the system (expiry of warranty).
If you have any problems or questions, please contact our service department.
Read the manual carefully before the initial start-up. The producer reserves the right to change
the herein described specifications in case of technical advance of the product.
► All accessories can be ordered according to the referred part numbers in brackets [ ].

General Information 9-
1.2 Warranty
Each single product passes through a quality process. Nevertheless, if failures occur please contact the
customer service at once. The warranty period covers 24 months starting on the delivery date. After the
warranty is expired the manufacturer guarantees additional 6 months warranty for all repaired or substituted
product components. Warranty does not apply to damages, which result from misuse or neglect. The
warranty also expires if you open the product. The manufacturer is not liable for consequential damage or in
case of a non-intended use of the product.
If a failure occurs during the warranty period the product will be replaced, calibrated or repaired without
further charges. The freight costs will be paid by the sender. The manufacturer reserves the right to
exchange components of the product instead of repairing it. If the failure results from misuse or neglect the
user has to pay for the repair. In that case you may ask for a cost estimate beforehand.
1.3 Scope of Supply
CTratio sensing head with fibre connection cable and electronic box
USB cable (Micro-USB, USB-C and USB-A cable included)
1 mounting nut
Mounting bracket, adjustable in one axis
Operator’s Manual

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1.4 Maintenance
Lens cleaning: Blow off loose particles using clean compressed air. The lens surface can be cleaned with a
soft, humid tissue (moistened with water) or a lens cleaner (e.g. Purosol or B+W Lens Cleaner).
Never use cleaning compounds which contain solvents (neither for the lens nor for the housing).
1.5 Safety Note
The CTratio is equipped with an integrated laser that serves to align the optics
with the target.
►3.2 Laser Sighting
1.6 Cautions
Avoid static electricity. The fiber optical cable has a minimum bending radius of 40 mm.
In case of problems or questions which may arise when you use the CTratio, please contact our service
department.
Read the manual carefully before the initial start-up. The producer reserves the right to change the herein
described specifications in case of technical advance of the product.

General Information 11-
1.7 Factory Default Settings
The unit has the following presetting at time of delivery:
Output 1
Analog: TProc/ max. temperature range (according to model) = 4-20 mA
Output 2
Analog: Attenuation/ 0-100 % = 0-20 mA
Emissivity
1,000
Slope
1,000
Averaging (AVG)
0,02 s
Smart Averaging
inactive
Hold mode (Peak/Valley hold)
inactive
1ML
1MH
1MH1
2ML
2MH
2MH1
Lower limit temperature range [°C]
525
700
1000
275
400
550
Upper limit temperature range [°C]
1400
2000
3000
1000
1500
3000
Max. attenuation
95 %
Temperature unit
°C
Baud rate [kBaud]
115
Main Display Source
TProc
Visual Alarm Source
Attenuation
Visual Alarm
0-95 % green
>95 % red
I/O pins
No function

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Smart Averaging means a dynamic average adaptation at high signal edges [activation via
software only].
►Appendix C –Smart Averaging

Technical Data 13-
2 Technical Data
2.1 General Specifications
Sensing head
Electronic box
Environmental rating
IP65 (NEMA-4)
Ambient Temperature
-20...200 °C (optional to 315 °C)
0...50 °C (2M) / 0…60 °C (1M)
Storage temperature
-40...200 °C
-40...85 °C1)
Relative humidity
10...95%, non condensing
Material
stainless steel
die casting zinc
Dimensions
length: 40 mm, thread: M18x1
89 mm x 70 mm x 36,6 mm
Weight
210 g (incl. fiber optics 3 m)
420 g
Fiber optics
Single mode fiber, stainless steel armour
Fiber optics length
3 m (standard), 8 m, 15 m
Vibration
IEC 68-2-6: 3 G, 11 –200 Hz, any axis
Shock
IEC 68-2-27: 50 G, 11 ms, any axis
Software
Ratio Connect / IRmobile Android app
1) The functionality of the LCD display can be limited at ambient temperatures below 0 °C

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2.2 Electrical Specifications
Power Supply
8–30 VDC
Power
max. 5 W
Aiming laser
520 nm, <1 mW, On/ Off via programming keys or software
Outputs/ analog
2x 0/ 4–20 mA (12 bit) / optional: 2x 0/ 4–20 mA (16 bit) isolated
Digital I/O pins
3 programmable in-/ outputs, usable as:
Alarm output (open collector output [24 V/ 1 A])
Digital input for triggered signal output and peak hold function
Output impedance
max. loop resistance 500 Ω (at 8-30 VDC)
Digital interface
USB (optional: RS232, RS485)
Relay outputs
2 x 60 V DC/ 42 V ACeff, 0,4 A; optically isolated (optional plug-in module)

Technical Data 15-
2.3 Measurement Specifications [1M models]
1ML
1MH
1MH1
Temperature range (scalable)
1 color: 450...1400 °C
2 color: 525...1400 °C
1 color: 650...2000 °C
2 color: 700...2000 °C
1 color: 900…3000 °C
2 color: 1000…3000 °C
Spectral range
0,8 - 1,1 µm
Optical resolution
38:1
100:1
Vario focus
300 mm to infinity, infinitely adjustable
System accuracy 1), 2), 3)
±(0,5 % of reading +2 °C)
Repeatability 1), 2), 3)
±0,3 % of reading
Temperature resolution
0,1 K
Response time (90 % signal) 4)
1 ms…10 s
Emissivity
0,050…1,000 (adjustable via programming keys or analog input)
Slope
0,800…1,200 (adjustable via programming keys or analog input)
Signal processing
One-color-, Two-color-mode, Attenuation monitoring, Alarm, Average, Peak hold,
Valley hold, Advanced peak hold with threshold and hysteresis (adjustable via
programming keys or software)
1) Measurements within specification over 5-95% of range
2) at ambient temperature 235 °C
3) = 1/ Response time 1 s
4) with dynamic adaptation at low signal levels

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2.4 Measurement Specifications [2M models]
2ML
2MH
2MH1
Temperature range (scalable)
1 color: 250...1000 °C
2 color: 275...1000 °C
1 color: 375...1500 °C
2 color: 400...1500 °C
1 color: 500…3000 °C
2 color: 550…3000 °C
Spectral range
1,45 - 1,75 µm
Optical resolution
38:1
50:1
100:1
Vario focus
300 mm to infinity, infinitely adjustable
System accuracy 1), 2), 3)
±(0,5 % of reading +2 °C)
Repeatability 1), 2). 3)
±0,3 % of reading
Temperature resolution
0,1 K
Response time (90 % signal) 4)
1 ms…10 s
Emissivity
0,050…1,000 (adjustable via programming keys or analog input)
Slope
0,800…1,200 (adjustable via programming keys or analog input)
Signal processing
One-color-, Two-color-mode, Attenuation monitoring, Alarm, Average, Peak hold,
Valley hold, Advanced peak hold with threshold and hysteresis (adjustable via
programming keys or software)
1) Measurements within specification over 5-95% of range
2) at ambient temperature 235 °C
3) = 1/ Response time 1 s
4) with dynamic adaptation at low signal levels

Technical Data 17-
2.5 Optics
The vario optics of the CTratio allows a smooth focusing of the optics to the desired distance.
Optics
Focus adjustable in the range
SFV
300 mm till infinity
The following tables show the diameter of the measuring spot for some selected distances. The spot size
refers to 90 % of the radiation energy.
The distance is always measured from the front edge of the sensing head.
As an alternative to the optical diagrams, the spot size calculator can also be used on the Optris website
(https://www.optris.global/spot-size-calculator) or via the Optris calculator app. The app can be downloaded
for free from the Google Play Store (see QR code).
D = Distance from front of the sensing head to the object
S = Spot size

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1ML / 2ML (D:S=38:1)
Spot size
mm
7,9
13,2
19,7
26,3
39,5
52,6
65,8
131,6
Measurement distance
mm
300
500
750
1000
1500
2000
2500
5000
2MH (D:S=50:1)
Spot size
mm
6
10
15
20
30
40
50
100
Measurement distance
mm
300
500
750
1000
1500
2000
2500
5000
1MH / 1MH1 / 2MH1 (D:S=100:1)
Spot size
mm
3
5
7,5
10
15
20
25
50
Measurement distance
mm
300
500
750
1000
1500
2000
2500
5000

Technical Data 19-
Sensor placement [1C mode]
The size of the measuring object and the optical resolution of the infrared thermometer determine the
maximum distance between sensing head and measuring object. In order to prevent measuring errors the
object should fill out the field of view of the optics completely. Consequently, the spot should at all times have
at least the same size like the object or should be smaller than that.
Sensor placement [2C mode]
In the 2-color-mode the sensing head can be placed under various conditions, like:
Measurement through holes smaller than the spot size
Measurement through dust, smoke or steam in the atmosphere
Measurement of objects smaller than the measurement spot
Measurement through a dirty lens or dirty sighting window
[►9.1 The Ratio Principle]

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3 Mechanical Installation
The CTratio sensing heads are equipped with a metrical M18x1-thread and can be installed either directly via
the sensor thread or with help of the hex nuts (1 piece included in scope of supply) to the mounting bracket
available. Various mounting brackets, which make the adjustment of the sensing head easier, can be
additionally ordered as accessories.
Sensing head
Please make sure that the minimum bending radius of the fiber optics of 40 mm will be
considered during installation.