Optris CTratio Operating Manual

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Fiber Optics Ratio Thermometer

CTratio

®

Operators manual

Optris GmbH
Ferdinand-Buisson-Str. 14
D – 13127 Berlin
GERMANY

Tel.: [phone]
Fax: [phone]

E-mail: [e-mail]
Internet: www.optris.com

CE-Conformity

The product complies with the following standards:
EMC: EN 61326-1:2013 (Basic requirements)

EN 61326-2-3:2013
Safety: EN 61010-1:2010
Laser Safety: EN 60825-1:2015

The product accomplishes the requirements of the EMC Directive 2014/30/EU and
of the Low Voltage Directive 2014/35/EU.
This product is in conformity with Directive 2011/65/EU (RoHS) of the European
Parliament and of the Council of 8 June 2011 on the restriction of the use of
certain hazardous substances in electrical and electronic equipment.

References to other chapters are marked as: ►.

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.

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Content

Page Page
Description 3 Operating 26

Scope of Supply 4 Sensor Setup 26
Maintenance 4 Software CompactConnect 32
Safety Note 5 Installation 32
Cautions 5 Communication Settings 33
Factory Default Settings 6 Basics of Infrared Thermometry 34
Technical Data 7 The Ratio Principle 35
General Specifications 7 Emissivity 38
Electrical Specifications 8 Definition 38
Measurement Specifications 9 Determination of unknown Emissivities 38
Optics 10 Characteristic Emissivities 39
Mechanical Installation 13 Characteristic Slope Values 40
Accessories 15 Determination of unknown Slope values 40
Laser Sighting 17 Attenuation 40
Electrical Installation 18 Appendix A – Emissivity Table Metals 42
Cable Connections 18 Appendix B – Emissivity Table Non Metals 44
Ground Connection 20 Appendix C – Smart Averaging 45

Outputs and Inputs 21

Analog Output 21
Digital I/O pins 22
Programming Interface 23
Relay Outputs 24
Alarms 25

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Description

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 [► 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 1­color-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 [► The Ratio Principle].

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PLEASE NOTE: Never use cleaning
compounds which contain solvents (neither
for the lens nor for the housing).

The CTratio sensing head is a sensitive optical system. Please use only the thread for mechanical
installation.
Avoid mechanical violence on the head – this may destroy the system (expiry of warranty).

Scope of Supply

 CTratio sensing head with fibre connection cable and electronic box
 2 mounting nuts
 Mounting bracket, adjustable in one axis
 Operators manual

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 water based
glass cleaner.

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Safety Note

WARNING!

This sensor contains an internal HIGH POWER LASER which is used for spot size illumination via
the fiber optics cable.

Before you open the electronics, remove the fiber optical cable from the
electronics or disassemble the optical head the sensor must be switched off
and disconnected from the power supply and USB interface!

The laser power at properly usage of the sensor (fiber optical cable incl.
sensing head connected) is < 1mW and fulfils laser class 2 according
IEC 60825-1:2015.

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.

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

► Appendix C

Factory Default Settings

The unit has the following presetting at time of delivery:

Signal output object temperature 0-5 V
Emissivity 1,000
Slope 1,000
Averaging (AVG) inactive
Smart Averaging inactive
Peak hold inactive
Valley hold inactive
Output channel 1 T 2C (2C temperature)
Lower limit temperature range [°C] 700
Upper limit temperature range [°C] 1800
Lower limit signal output 0 V
Upper limit signal output 5 V
Max. attenuation 95 %
Temperature unit °C
Baud rate [kBaud] 115

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Technical Data

General Specifications

Sensing head Electronic box

Environmental rating IP65 (NEMA-4) IP65 (NEMA-4)
Ambient Temperature -20...250 °C 0...85 °C (70 °C with Laser ON)
Storage temperature -40...250 °C -40...85 °C
Relative humidity 10...95%, non condensing 10...95%, non condensing

Material stainless steel die casting zinc
Dimensions length: 78,1 mm (SF head) 89 mm x 70 mm x 30 mm
82,6 mm (CF head)
thread: M18x1
Weight 375 g (incl. fiber optics 3 m) 420 g

Fiber optics multimode fiber, stainless steel armour
Fiber optics length 3 m (standard), 6 m, 10 m, 15 m, 22 m

Vibration IEC 68-2-6: 3G, 11 – 200Hz, any axis
Shock IEC 68-2-27: 50G, 11ms, any axis

Software CompactConnect (optional; for programming only)

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Electrical Specifications

Power Supply 8–36 VDC
Current draw max. 200 mA
Aiming laser 650 nm, 1mW, On/ Off via programming keys or software

Outputs/ analog selectable: 0/ 4–20 mA, 0–5/ 10 V
Digital I/O pins 2 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 impedances
mA max. loop resistance 500 Ω (at 8-36 VDC)
mV min. 100 KΩ load impedance

Digital interface USB (optional; for programming only)
Relay outputs 2 x 60 VDC/ 42 VAC

, 0,4 A; optically isolated (optional plug-in module)

RMS

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Measurement Specifications

Temperature range (scalable) 700...1800 °C
Spectral range 0,7...1,1 µm
Optical resolution 40:1 (SF optics)
40:1 (CF2 optics)

System accuracy 1) ±(1 % of reading +1 °C)
Repeatability 1) ±(0,5 % of reading +1 °C)

2)

2)

Temperature resolution (>900 °C) 0,1 K
Response time (95 % signal) 5 ms...10 s 3)

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)

at ambient temperature 235 °C

2)

 = 1/ Response time 1s

3)

with dynamic adaptation at low signal levels

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Optics

The CTratio is available in two focus versions:

SF optics: 41 mm@ 1524 mm (D:S = 40:1)
CF2 optics: 7,7 mm@ 305 mm (D:S = 40:1)

The following optical charts show the diameter of the measuring spot in dependence on the distance
between measuring object and sensing head. The spot size refers to 95 % of the radiation energy.
The distance is always measured from the front edge of the sensing head.

SF optics

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CF2 optics

distance = distance from front edge of the sensing head to the measurement object
The D:S ratio is valid for the focus point.

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Please note that the sensor accuracy is not guaranteed for signal reductions of more than 95%.

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

[► The Ratio Principle]

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Please make sure that the minimum bending radius of the
fiber optics of 40 mm will be considered during installation.

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 (2 pieces 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

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