Optris CT 1M, CT 2M Operating Manual

optris

®

CT

Infrared-thermometer

LT/ LTF/ LTH/ 1M/ 2M/ 3M/ G5/ P3/ P7

Operator’s Manual

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

1 General Information ................................................................................................................................. 8

1.1 Description ....................................................................................................................................... 8

1.2 Warranty ........................................................................................................................................... 9

1.3 Scope of Supply ............................................................................................................................... 9

1.4 Maintenance ................................................................................................................................... 10

1.5 Model Overview .............................................................................................................................. 11

1.6 Factory Default Settings ................................................................................................................. 13

2 Technical Data ........................................................................................................................................ 15

2.1 General Specifications ................................................................................................................... 15

2.2 Electrical Specifications .................................................................................................................. 16

2.3 Measurement Specifications [LT models] ...................................................................................... 17

2.4 Measurement Specifications [CTfast/ CThot]................................................................................. 18

-4 -

2.5 Measurement Specifications [1M/ 2M/ 3M models] ....................................................................... 20

2.6 Measurement Specifications [G5/ P7 models] ............................................................................... 23

2.7 Optical Charts ................................................................................................................................. 24

2.8 CF Lens and Protective Window .................................................................................................... 35

3 Mechanical Installation .......................................................................................................................... 39

3.1 Mounting Accessories .................................................................................................................... 42

3.2 Air Purge Collars ............................................................................................................................ 44

3.3 Further Accessories ....................................................................................................................... 46

4 Electrical Installation ............................................................................................................................. 53

4.1 Cable Connections ......................................................................................................................... 53

4.1.1 Designation [models LT/ G5/ P3/ P7] ........................................................................................ 53

4.1.2 Designation [models 1M/ 2M/ 3M] ............................................................................................. 54

4.1.3 Power supply.............................................................................................................................. 54

4.1.4 Cable Assembling ...................................................................................................................... 55

-Table of Contents 5-

4.2 Ground Connection ........................................................................................................................ 56

4.2.1 1M, 2M, 3M models ................................................................................................................... 56

4.2.2 LT, LTF, LTH, G5, P3, P7 models ............................................................................................. 57

4.3 Exchange of the Sensing Head ...................................................................................................... 58

4.3.1 Entering of the Calibration Code ................................................................................................ 58

4.3.2 Sensing Head Cable .................................................................................................................. 59

5 Outputs and Inputs ................................................................................................................................ 60

5.1 Analog Outputs ............................................................................................................................... 60

5.1.1 Output channel 1 ........................................................................................................................ 60

5.1.2 Output channel 2 [LT/ G5/ P3/ P7 only] ..................................................................................... 60

5.2 Digital Interfaces ............................................................................................................................. 61

5.3 Relay Outputs ................................................................................................................................. 61

5.4 Functional Inputs ............................................................................................................................ 62

5.5 Alarms ............................................................................................................................................ 63

-6 -

5.5.1 Output channel 1 and 2 [channel 2 on LT/ G5/ P3/ P7 only] ..................................................... 63

5.5.2 Open collector output / AL2: ...................................................................................................... 64

6 Operating ................................................................................................................................................ 65

6.1 Sensor Setup .................................................................................................................................. 65

6.2 Error messages .............................................................................................................................. 71

7 IRmobile app ........................................................................................................................................... 72

8 Software CompactConnect ................................................................................................................... 74

8.1 Installation ...................................................................................................................................... 74

8.2 Communication Settings ................................................................................................................ 76

8.2.1 Serial Interface ........................................................................................................................... 76

8.2.2 Protocol ...................................................................................................................................... 76

8.2.3 ASCII protocol ............................................................................................................................ 77

8.2.4 Saving of parameter settings ..................................................................................................... 78

9 Basics of Infrared Thermometry........................................................................................................... 79

-Table of Contents 7-

10 Emissivity ............................................................................................................................................... 80

10.1 Definition......................................................................................................................................... 80

10.2 Determination of unknown Emissivity ............................................................................................ 80

10.3 Characteristic Emissivity ................................................................................................................ 81

Appendix A – Table of Emissivity for metals ............................................................................................... 82

Appendix B – Table of Emissivity for non-metals ....................................................................................... 84

Appendix C – Smart Averaging ..................................................................................................................... 85

Appendix D – Declaration of Conformity ..................................................................................................... 86

-8 -

The CT 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 [ ].

1 General Information

1.1 Description

Thank you for choosing the optris® CT infrared thermometer.
The sensors of the optris CT series are noncontact infrared temperature sensors.
They calculate the surface temperature based on the emitted infrared energy of objects [►9 Basics of
Infrared Thermometry]. The sensor housing of the CT head is made of stainless steel (IP65/ NEMA-4
rating) – the sensor electronics is placed in a separate box made of die casting zinc.

-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

 CT sensing head with connection cable and electronic box
 Mounting nut
 Operators manual

-10 -

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

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).

-General Information 11-

Model

Model codes

Measurement
range

Spectral
response

Typical applications

CT LT
LT02

-50 to 600 °C

8-14 µm

non-metallic surfaces
LT15

LT22

-50 to 975 °C

CT fast
LT15F

-50 to 975 °C

8-14 µm

fast processes
LT25F

CT hot
LT02H

-40 to 975 °C

8-14 µm

high ambient temperatures (up to 250 °C)
LT10H

CT1M
1ML

485 to 1050 °C

1,0 µm

metals and ceramic surfaces
1MH

650 to 1800 °C

1MH1

800 to 2200 °C

CT 2M
2ML

250 to 800 °C

1,6 µm

metals and ceramic surfaces
2MH

385 to 1600 °C

2MH1

490 to 2000 °C

1.5 Model Overview

The sensors of the CT series are available in the following basic versions:

-12 -

CT 3M

3ML

50 to 400 °C

2,3 µm

metals at low object temperatures (from 50 °C)

3MH

100 to 600 °C

3MH1

150 to 1000 °C

3MH2

200 to 1500 °C

3MH3

250 to 1800 °C

CT G5
G5L

100 to 1200 °C

5,0 µm

measurement of glass
G5H

250 to 1650 °C

CT P3

P3

50 to 400 °C

3,43 µm

temperatures of thin film plastics
CT P7

P7

0 to 710 °C

7,9 µm

In the following chapters of this manual you will find only the short model codes.
On the 1M, 2M, 3M and G5 models the whole measurement range is split into several sub ranges (L, H, H1 etc.).

-General Information 13-

Signal output object temperature

0-5 V

Emissivity

0,970 [LT/ G5/ P3/ P7]
1,000 [1M/ 2M/ 3M]

Transmissivity

1,000

Averaging (AVG)

0,2 s
LT15F/ LT25F: 0,1 s
1M/ 2M/ 3M: 0,001 s

Smart Averaging

inactive
LT15F, LT25F: active

Peak hold

inactive

Valley hold

inactive

LT

1ML

1MH

1MH1

2ML

2MH

2MH1

3ML

3MH

Lower limit temperature range [°C]

0

485

650

800

250

385

490

50

100

Upper limit temperature range [°C]

500

1050

1800

2200

800

1600

2000

400

600

Lower alarm limit [°C]
(normally closed)

30

600

800

1200

350

500

800

100

250

Upper alarm limit [°C]
(normally open)

100

900

1400

1600

600

1200

1400

300

500

1.6 Factory Default Settings

The unit has the following presetting at time of delivery:

-14 -

3MH1

3MH2

3MH3

G5L

G5H

P3

P7

Lower limit temperature range [°C]

150

200

250

100

250

50 0

Upper limit temperature range [°C]

1000

1500

1800

1200

1650

400

710

Lower alarm limit [°C]
(normally closed)

350

550

750

200

350

70

30

Upper alarm limit [°C]
(normally open)

600

1000

1200

500

900

200

100
Lower limit signal output

0 V

Upper limit signal output

5 V

Temperature unit

°C

Ambient temperature compensation
(Output at OUT-AMB as 0-5 V signal on
LT, G5 and P7)

internal head temperature probe
Baud rate [kBaud]

115

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

-Technical Data 15-

Sensing head

Electronic box

Environmental rating

IP65 (NEMA-4)

IP65 (NEMA-4)

Operating Temperature

see: Measurement Specifications

-20...85 °C 1)

Storage temperature

see: Measurement Specifications

-40...85 °C

Relative humidity

10...95 %, non-condensing

Material

stainless steel

die casting zinc

Dimensions

28 mm x 14 mm or 32 mm x 14 mm, M12x1

89 mm x 70 mm x 30 mm

Dimensions CThot/ CT P3/ P7

55 mm x 29,5 mm, M18x1 (with massive housing)

Weight

40 g

420 g

Weight CThot/ CT P3/ P7

205 g (with massive housing)

Cable length

1 m (only LT02, LT15, LT22, CTfast)
3 m (Standard at CThot, 1M, 2M, 3M, G5, P3 and P7)

2)

8 m
15 m

Cable diameter

2,8 mm

Ambient temperature cable

max. 180 °C [High temperature cable for CThot: 250 °C]

Vibration

IEC 68-2-6: 3G, 11 – 200 Hz, any axis

Shock

IEC 68-2-27: 50G, 11 ms, any axis

2 Technical Data

2.1 General Specifications

-16 -

Pressure resistance (head)

8 bar

Software (optional)

CompactConnect

Power Supply

8–36 VDC

Current draw

max. 100 mA

Outputs/ analog
Channel 1

Channel 2 [LT/ G5/ P3/ P7 only]

selectable: 0/ 4–20 mA, 0–5/ 10 V, thermocouple (J or K) or alarm output (Signal source:
object temperature)

Head temperature [-20...180 °C/ -20...250 °C on LT02H and LT10H] as 0–5 V or 0–10 V
output or alarm output (Signal source switchable to object temperature or electronic box
temperature if used as alarm output)

Alarm output

Open collector output (NPN type) at Pin AL2 [24 V/ 50 mA]

Output impedances
mA
mV
Thermocouple

max. loop resistance 500 Ω (at 8-36 VDC)
min. 100 KΩ load impedance
20 Ω

Digital interfaces

USB, RS232, RS485, CAN, Profibus DP, Ethernet, Modbus RTU (optional plug-in
modules)

Relay outputs

2 x 60 VDC/ 42 VAC

RMS

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

1)

The functionality of the LCD display can be limited at ambient temperatures below 0 °C

2)

The 3M models are only available with 3 m cable length

2.2 Electrical Specifications

-Technical Data 17-

Functional inputs

F1-F3; software programmable for the following functions:

 external emissivity adjustment
 ambient temperature compensation
 trigger (reset of hold functions)

Input impedance F2 and F3: 43 kΩ

LT02

LT15

LT22

Temperature range (scalable)

-50...600 °C

-50...975 °C

Ambient temperature (head)

-20...130 °C

-20...180 °C

Storage temperature (head)

-40...130 °C

-40...180 °C

Spectral range

8...14 µm

Optical resolution

2:1

15:1

22:1

System accuracy

1), 2)

±1,0 °C or ±1,0 % 3)

Repeatability 1)

±0,5 °C or ±0,5 % 3)

Temperature coefficient 5)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

3), 4)

0,1 K

0,05 K

Response time (95 % signal)

150 ms

Warm-up time

10 min

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

2.3 Measurement Specifications [LT models]

-18 -

Transmissivity

0,100...1,100 (adjustable via programming keys or software)

Interface (optional)

USB (programmable adapter)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

On the LT02 models the head cable must not be moved during the measurement.

LT15F

LT25F

LT02H

LT10H

Temperature range (scalable)

-50...975 °C

-40...975 °C

Ambient temperature (head)

-20...120 °C

-20...250 °C

Storage temperature (head)

-40...120 °C

-40...250 °C

Spectral range

8...14 µm

Optical resolution

15:1

25:1

2:1

10:1

System accuracy

1), 2)

±2°C or ±1% 3)

±1,5°C or ±1% 3)

Repeatability 1)

±0,75 °C or ±0,75 % 3)

±0,5 °C or ±0,5 % 3)

1)

at ambient temperature 235 °C; whichever is greater

2)

Accuracy for thermocouple output: ±2,5°C or ±1%

3)

at object temperatures >0 °C, ε = 1

4)

at time constant 200 ms and an object temperature of 25 °C

5)

for ambient temperatures (head) <18 °C and >28 °C

2.4 Measurement Specifications [CTfast/ CThot]

-Technical Data 19-

LT15F

LT25F

LT02H

LT10H

Temperature coefficient 5)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

3), 4)

0,2 K

0,4 K

0,25 K

Response time (90 % signal)

9 ms

6 ms

100 ms

Warm-up time

10 min

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

Transmissivity

0,100...1,100 (adjustable via programming keys or software)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

On the CThot models [LT02H/ LT10H] the head cable must not be moved during the
measurement.

1)

at ambient temperature 235 °C; whichever is greater

2)

Accuracy for thermocouple output: ±2,5°C or ±1%

3)

at object temperatures ≥ 20 °C

4)

at time constant 100 ms with smart averaging and an object temperature of 25 °C

5)

for ambient temperatures (head) <18 °C and >28 °C

-20 -

1ML

1MH

1MH1

2ML

Temperature range (scalable)

485...1050 °C

650...1800 °C

800...2200 °C

250...800 °C

Ambient temperature (head)

-20...100 °C

-20...125 °C

Storage temperature (head)

-40...100 °C

-40...125 °C

Spectral range

1,0 µm

1,6 µm

Optical resolution

40:1

75:1

40:1

System accuracy

1) 2)

±(0,3 % of reading +2°C)

3)

Repeatability 1)

±(0,1 % of reading +1 °C)

3)

Temperature coefficient 5)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

0,1 K 3)

Exposure time (90 % signal)

1 ms 4)

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

Transmissivity

0,100...1,000 (adjustable via programming keys or software)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

2.5 Measurement Specifications [1M/ 2M/ 3M models]

1)

at ambient temperature 235 °C

2)

Accuracy for thermocouple output: ±3,5°C or ±1%

3)

 = 1/ Response time 1s

4)

with dynamic adaptation at low signal levels

5)

for ambient temperatures (head) <18 °C and >28 °C

-Technical Data 21-

2MH

2MH1

3ML

3MH

Temperature range (scalable)

385...1600 °C

490...2000 °C

50...400 °C

1), 2)

100...600 °C

1), 2)

Ambient temperature (head)

-20...125 °C

-20...85 °C

Storage temperature (head)

-40...125 °C

-40...125 °C

Spectral range

1,6 µm

2,3 µm

Optical resolution

75:1

22:1

33:1

System accuracy

3) 4)

±(0,3 % of reading +2°C)

5)

Repeatability 3)

±(0,1 % of reading +1 °C)

5)

Temperature coefficient 7)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

0,1 K 5)

Exposure time (90 % signal)

1 ms 6)

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

Transmissivity

0,100...1,000 (adjustable via programming keys or software)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

1)

T

> T

Head

+25 °C

≥ start of measurement range + 50°C

Object

Object

2)

Specification valid at T

3)

at ambient temperature 235 °C

4)

Accuracy for thermocouple output: ±2,5°C or ±1%

5)

 = 1/ Response time 1s

6)

with dynamic adaptation at low signal levels

7)

for ambient temperatures (head) <18 °C and >28 °C

-22 -

3MH1

3MH2

3MH3

Temperature range (scalable) 2)

150...1000 °C

200...1500 °C

250...1800 °C

Ambient temperature (head)

-20...85 °C

Storage temperature (head)

-40...125 °C

Spectral range

2,3 µm

Optical resolution

75:1

System accuracy

1) 3)

±(0,3 % of reading +2°C)

4)

Repeatability 1)

±(0,1 % of reading +1 °C)

4)

Temperature coefficient 6)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

0,1 K 4)

Response time (90 % signal)

1 ms 5)

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

Transmissivity

0,100...1,000 (adjustable via programming keys or software)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

1)

at ambient temperature 235 °C

2)

Specification valid at T

3)

Accuracy for thermocouple output: ±2,5°C or ±1%

4)

 = 1/ Response time 1s

5)

with dynamic adaptation at low signal levels

6)

for ambient temperatures (head) <18 °C and >28 °C

≥ start of measurement range + 50°C

Object

-Technical Data 23-

G5L

G5H

P3

P7

Temperature range (scalable)

100...1200 °C

250...1650 °C

50...400 °C

0...710 °C

Ambient temperature (head)

-20...85 °C

0...75 °C

-20...85 °C

Storage temperature (head)

-40...85 °C

Spectral range

5,0 µm

3,43 µm

7,9 µm

Optical resolution

10:1

20:1

15:1

10:1

System accuracy

1) 2)

±2 °C or ±1 % 3)

±3 °C or ±1 %

±1,5 °C or ±1 %

3) 5)

Repeatability 1)

±0,5 °C or ±0,5 % 3)

±1,5 °C

±0,5 °C or ±0,5 %

3) 5)

Temperature coefficient 4)

±0,05 K/ K or ±0,05 %/ K (whichever is greater)

Temperature resolution (NETD)

0,1 K 3)

0,2 K 3)

0,1 K 3)

0,5 K 3)

Response time (90 % signal)

120 ms

80 ms

100 ms

150 ms

Emissivity/ Gain

0,100...1,100 (adjustable via programming keys or software)

Transmissivity

0,100...1,000 (adjustable via programming keys or software)

Signal processing

Average, peak hold, valley hold (adjustable via programming keys or software)

2.6 Measurement Specifications [G5/ P7 models]

1)

at ambient temperature 235 °C; whichever is greater

2)

Accuracy for thermocouple output: ±2,5°C or ±1%

3)

 = 1/ Response time 1s

4)

for ambient temperatures (head) <18 °C and >28 °C

5)

at object temperatures ≥ 25 °C

-24 -

D = Distance from front of the sensing
head to the object

S = Spot size

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.

2.7 Optical Charts

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 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).

-Technical Data 25-

LT22
Optik: CF

D:S: 22:1
2,3mm@ 50mm

D:S (far field) = 6:1

LT22
Optics: SF

D:S: 22:1

LT25F
Optics: SF

D:S: 25:1

-26 -

LT15 LT15F
Optics: CF

D:S: 15:1
3,0mm@ 50mm

D:S (far field) = 5:1

LT15 LT15F
Optics: SF

D:S: 15:1

-Technical Data 27-

LT10H
Optics: CF1

D:S: 10:1
3,0mm@ 30mm

D:S (far field) = 3:1

LT10H G5L P7
Optics: SF

D:S: 10:1

-28 -

G5H
Optics: SF

D:S: 20:1

LT02 LT02H
Optics: SF

D:S: 2:1

-Technical Data 29-

1ML 2ML
Optics: SF

D:S: 40:1

1ML 2ML
Optics: CF

D:S: 40:1
2,7mm@ 110mm

D:S (far field) = 12:1

-30 -

1MH 1MH1 2MH
2MH1 3MH1-H3
Optics: SF

D:S: 75:1

1MH 1MH1 2MH
2MH1 3MH1-H3
Optics: CF

D:S: 75:1
1,5mm@ 110mm

D:S (far field) = 14:1

-Technical Data 31-

3ML
Optics: CF1

D:S: 22:1
1,5mm@ 30mm

D:S (far field) = 3,5:1

3ML
Optics: SF

D:S: 22:1

-32 -

3MH
Optics: SF

D:S: 33:1

3ML
Optics: CF

D:S: 22:1
5mm@ 110mm

D:S (far field) = 9:1

-Technical Data 33-

3MH
Optics: CF

D:S: 33:1
3,4mm@ 110mm

D:S (far field) = 11:1

3MH
Optics: CF1

D:S: 33:1
1,0mm@ 30mm

D:S (far field) = 4:1

P3
Optics: SF

D:S: 15:1

-34 -

-Technical Data 35-

The optional CF lens allows the measurement of very
small objects and can be used in combination with all
LT, 1M, 2M and 3M models. The minimum spot size
depends on the used sensing head. The distance is
always measured from the front edge of the CF lens
holder or laminar air purge collar.

ACCTCF

CF lens for installation on sensing head [LT]

ACCTCFHT

CF lens for installation on sensing head [1M/ 2M/ 3M]

ACCTCFE

CF lens with external thread for installation in massive housing [LT]

ACCTCFHTE

CF lens with external thread for installation in massive housing [1M/ 2M/ 3M]

ACCTPW

Protective window for installation on sensing
head [LT]

ACCTPWHT

Protective window for installation on sensing
head [1M/ 2M/ 3M]

ACCTPWE

Protective window with external thread for
installation in the massive housing [LT]

ACCTPWHTE

Protective window with external thread for
installation in the massive housing [1M/ 2M/ 3M]

Typical Transmission values* if the
protective window is used (average
values):
LT 0,83
1M/ 2M/ 3M 0,93 * deviations possible

Typical Transmission values* if the CF lens is
used (average values):

LT 0,78
1M 0,80
2M 0,87
3M 0,92 * deviations possible

2.8 CF Lens and Protective Window

The installation on the sensing head will be done by turning the CF lens until end stop. To combine it with the
massive housing please use the version with external thread M12x1.

Versions Overview:

For protection of the sensing head optics a protective window is available. The mechanical dimensions are
equal to the CF lens. It is available in the following versions:

-36 -

CF lens:
ACCTCF/ ACCTCFHT
Protective window:
ACCTPWHT

Laminar air purge with integrated
CF lens:
ACCTAPLCF/ ACCTAPLCFHT

CF lens with external thread:
ACCTCFE/ ACCTCFHTE
Protective window with external
thread: ACCTPWE/ ACCTPWHTE

LT25F + CF lens

0,5 mm@ 8 mm
0,5 mm@ 6 mm [ACCTAPLCF]

D:S (far field) = 1,6:1

-Technical Data 37-

LT15/ LT15F + CF lens

0,8 mm@ 10 mm
0,8 mm@ 8 mm [ACCTAPLCF]

D:S (far field) = 1,5:1

LT22 + CF lens

0,6 mm@ 10 mm
0,6 mm@ 8 mm [ACCTAPLCF]

D:S (far field) = 1,5:1

-38 -

LT02/ LT02H + CF lens

2,5 mm@ 23 mm
2,5 mm@ 21 mm [ACCTAPLCF]

D:S (far field) = 2,5:1

LT10H + CF lens

1,2 mm@ 10 mm
1,2 mm@ 8 mm [ACCTAPLCF]

D:S (far field) = 1,2:1

-Mechanical Installation 39-

All accessories can be ordered using the according part numbers in brackets [ ].

Sensing head

Sensing head LT15CF/ LT22CF/ 3MCF/ CTP7CF

3 Mechanical Installation

The CT sensing heads are equipped with a metrical M12x1-thread and can be installed either directly via the
sensor thread or with help of the hex nut (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.

-40 -

Make sure to keep the optical path clear of any obstacles.

The CThot- and CT P3/P7-sensors will be delivered with the massive housing and can be installed via the
M18x1-thread.

Massive housing (Standard on CThot, P3 and P7)

-Mechanical Installation 41-

Electronic box

The electronic box is also available with closed cover (display and programming keys
with no access from outside) [ACCTCOV].

On the CT models LT02, LT02H and LT10H the head cable must not be
moved during the measurement.

-42 -

Mounting bracket, adjustable in
one axis [ACCTFB]

Mounting bolt with M12x1 thread,
adjustable in one axis [ACCTMB]

Mounting fork with M12x1 thread,
adjustable in 2 axes [ACCTMG]

Mounting bracket, adjustable in two axes
[ACCTAB] consisting of:
ACCTFB and ACCTMB

The Mounting fork can
be combined with the
Mounting bracket
[ACCTFB] using the
M12x1 thread.

3.1 Mounting Accessories

-Mechanical Installation 43-

When changing the windows, the screws must be tightened with a tightening torque of 1 Nm.

K40 flange [ACCTKF40GE] for CTLT with Ge window or [ACCTKF40B270] for CT1M, 2M, 3M with B270 window

-44 -

Standard air purge collar [ACCTAP] for optics with a

D:S ≥ 10:1 (not for sensing heads with 32 mm length),

fits to the mounting bracket
Hose connection: 3x5 mm
Thread (fitting): M5

Standard air purge collar [ACCTAP2] for optics with a

D:S ≤ 2:1 (not for sensing heads with 32 mm length),

fits to the mounting bracket
Hose connection: 3x5 mm
Thread (fitting): M5

The needed amount of air (approx. 2...10 l/ min.) depends on the
application and the installation conditions on-site.

3.2 Air Purge Collars

The lens must be kept clean at all times from dust, smoke, fumes and other contaminants in order to avoid
reading errors. These effects can be reduced by using an air purge collar. Make sure to use oil-free,
technically clean air, only.

-Mechanical Installation 45-

Laminar air purge collar [ACCTAPL]
The sideward air outlet prevents a cooling down of the
object in short distances.
Hose connection: 3x5 mm
Thread (fitting): M5

Laminar air purge collar with mounting fork
[ACCTAPLMF], adjustable in 2 axes

The needed amount of air (approx. 2...10 l/ min.) depends on the
application and the installation conditions on-site.

-46 -

Right Angle Mirror [ACCTRAM]

for optics with a D:S ≥ 10:1;
enables measurements with 90° angle to sensor axis.

Laser-Sighting tool [D08ACCTLST]

battery powered (2x Alcaline AA), for alignment of CT
sensing heads. The laser head has the same mechanical
dimensions as the CT sensing head.

WARNING: Do not point the laser directly at the eyes of
persons or animals! Do not stare into the laser beam.
Avoid indirect exposure via reflective surfaces!

The mirror has a reflexion of 96% in combination with a LT22 and LT15 head and 88%
with a LT15F head.
If the mirror is used this value has to be multiplied by the emissivity value of the
measurement object.

Example: LT22 and object with emissivity = 0,85
0,85 x 0,96 = 0,816
Thus the emissivity in the CT has to be set to the resulting value of 0,816.

3.3 Further Accessories

-Mechanical Installation 47-

OEM-Laser-Sighting tool [ACCTOEMLST or ACCTOEMLSTCB8]

Mounting bracket [ACCTFB2]

OEM-Laser-Sightingtool
The OEM-Laser-Sighting tool is available with 3,5 m [ACCTOEMLST] and 8 m connection cable
[ACCTOEMLSTCB8]. The laser can be connected to the pins 3V SW and GND [►4 Electrical Installation]

and switched on and off via the programming keys or via the software.

The special double-hole mounting bracket [ACCTFB2] allows a simultaneous mounting of the CT sensing
head and the laser head.

-48 -

Massive housing, stainless steel [D06ACCTMHS] – also available in aluminum (anodized) or brass

The Massive housing allows reproducible and
stable measurements on applications with
significant and short-term variation in ambient
temperatures. It can be combined with the CF
lens [ACCTCFE] or with the protective window
[ACCTPWE].

►2.8 CF Lens and Protective Window]

IMPORTANT: For an optimum function of the
massive housing 10 cm of the head cable
must be installed in loops inside the housing.

Massive Housing

-Mechanical Installation 49-

Air purge collar for massive housing (thread M18x1)
[ACCTAPMH]

Mounting bracket for massive housing,
adjustable in one axis [ACCTFBMH]

The needed amount of air (approx. 2...10 l/ min.) depends on the
application and the installation conditions on-site.

Accessories for Massive Housing

-50 -

Pipe adapter [ACCTPA]

Sighting tube [ACCTST40]

The sighting tubes can only be used for sensing heads with a
distance-to-spot ratio (D:S) of ≥ 15:1.

Pipe Adapter and Sighting Tubes

The pipe adapter [ACCTPA] allows an assembling of sighting tubes directly on the CT head. The sighting
tubes are available in 3 different lengths:

ACCTST20 20 mm
ACCTST40 40 mm
ACCTST88 88 mm

-Mechanical Installation 51-

Rail Mount Adapter [ACCTRAIL]

Tilt Assembly for CT heads

With this mounting accessory a fine adjustment of the
CT head with an off-axis angle +/- 6,5° is possible.

Tilt assembly [ACCTTAS]

Rail Mount Adapter for Electronic box

With the rail mount adapter the CT electronics can be mounted easily on a DIN rail (TS35) according
EN50022.

-52 -

Accessories for IRmobile app

The IR App Connector is used to connect the sensor to a smartphone or tablet (► 7 IRmobile app). The
connector cable can be also used for the connection to your PC in combination with the software
CompactConnect which can be downloaded for free under https://www.optris.global/downloads-software.

IR app Connector: USB programming adaptor [ACCTIAC]

-Electrical Installation 53-

+8…36 VDC

Power supply

Opened LT/ G5/ P3/ P7 electronic box with terminal
connections

GND

Ground (0 V) of power supply

GND

Ground (0 V) of internal in- and outputs

OUT-AMB

Analog output head temperature (mV)

OUT-TC

Analog output thermocouple (J or K)

OUT-mV/mA

Analog output object temperature (mV or
mA)

F1-F3

Functional inputs

AL2

Alarm 2 (Open collector output)

3V SW

3 VDC, switchable, for laser-sightingtool

GND

Ground (0 V) for laser-sightingtool

BROWN

Temperature probe head

WHITE

Temperature probe head

GREEN

Detector signal (–)

YELLOW

Detector signal (+)

4 Electrical Installation

4.1 Cable Connections

For the electrical installation of the CT please open at first the cover of the electronic box (4 screws). Below
the display are the screw terminals for the cable connection.

4.1.1 Designation [models LT/ G5/ P3/ P7]

-54 -

+8…36 VDC

Power supply

Opened 1M/ 2M/ 3M electronic box with terminal
connections

GND

Ground (0 V) of power supply

GND

Ground (0 V) of internal in- and outputs

AL2

Alarm 2 (Open collector output)

OUT-TC

Analog output thermocouple (J or K)

OUT-mV/mA

Analog output object temperature (mV or
mA)

F1-F3

Functional inputs

GND

Ground (0 V)

3V SW

3 VDC, switchable, for laser-sightingtool

BROWN

Temperature probe head (NTC)

WHITE

Head ground

GREEN

Head power

YELLOW

Detector signal

Please do never connect a supply voltage to the analog outputs as this will destroy the
output!
The CT is not a 2-wire sensor!

4.1.2 Designation [models 1M/ 2M/ 3M]

4.1.3 Power supply
Please use a stabilized power supply unit with an output voltage in the range of 8–36 VDC which can supply

100 mA. The ripple should be max. 200 mV.

-Electrical Installation 55-

Use shielded cables only. The sensor shield has to be grounded.

4.1.4 Cable Assembling

The cable gland M12x1,5 allows the use of cables with a diameter of 3 to 5 mm.
Remove the isolation from the cable (40 mm power supply, 50 mm signal outputs, 60 mm functional inputs).
Cut the shield down to approximately 5 mm and spread the strands out. Extract about 4 mm of the wire
isolation and tin the wire ends.
Place the pressing screw, the rubber washer and the metal washers of the cable gland one after the other
onto the prepared cable end. Spread the strands and fix the shield between two of the metal washers. Insert
the cable into the cable gland until the limit stop. Screw the cap tight.
Every single wire may be connected to the according screw clamps according to their colors.

-56 -

4.2 Ground Connection

4.2.1 1M, 2M, 3M models

At the bottom side of the mainboard PCB you will find a connector (jumper) which has been placed from
factory side as shown in the picture [bottom and middle pin connected]. In this position the ground
connections (GND power supply/ outputs) are connected with the ground of the electronics housing.

To avoid ground loops and related signal interferences in industrial environments it might be necessary to
interrupt this connection. To do this put the jumper in the opposite position [middle and top pin connected].

If the thermocouple output is used the connection GND – housing should be interrupted generally.

-Electrical Installation 57-

4.2.2 LT, LTF, LTH, G5, P3, P7 models

At the bottom side of the mainboard PCB you will find a connector (jumper) which has been placed from
factory side as shown in the picture [left and middle pin connected]. In this position the ground connections
(GND power supply/ outputs) are connected with the ground of the electronics housing.

To avoid ground loops and related signal interferences in industrial environments it might be necessary to
interrupt this connection. To do this please put the jumper in the other position [middle and right pin
connected].

If the thermocouple output is used the connection GND – housing should be interrupted generally.

-58 -

From factory side the sensing head has already been
connected to the electronics and the calibration code has been
entered. Inside a certain model group any exchange of sensing
heads and electronics is possible. The sensing heads and
electronics of the CTfast models LT15F and LT25F cannot be
exchanged.

Every head has a specific calibration code, which is printed on the
head cable. For a correct temperature measurement and
functionality of the sensor this calibration code must be stored
into the electronic box. The calibration code consists of 3 blocks
(1M, 2M, 3M = 5 blocks) with 4 characters each.

Example:

A6FG

-

22KB

-

0AS0

Block 1

Block 2

Block 3

After exchanging a head the calibration
code of the new head must be entered
into the electronics.

4.3 Exchange of the Sensing Head

4.3.1 Entering of the Calibration Code

For entering the code please press the Up and Down key (keep pressed) and then the Mode key.
The display shows HCODE and then the 4 signs of the first block. With Up and Down each sign can be
changed; Mode switches to the next sign or next block.
The entering of a new calibration code can also be made via the CompactConnect software (optional).

-Electrical Installation 59-

You will find the calibration code on a label fixed on the head cable (near the electronics). Please
do not remove this label or make sure the code is noted anywhere. The code is needed if the
electronics has to be exchanged or in case of a necessary recalibration of the sensor.

After you have modified the head code a reset is necessary to activate the change.
[►6 Operating]

On the CT models LT02, LT02H and LT10H the head cable must not be moved during the
measurement.

4.3.2 Sensing Head Cable

On all CT models (exception 3M, P3, P7) the sensing head cable can be shortened if necessary.
On the models 1M, 2M and CTfast the sensing head cable can be shortened by max. 3 m.
A shortening of the cable will cause an additional measuring error of about 0,1 K/ m.
The 3M models are only available with 3 m cable.

-60 -

The CT has two analog output channels.

Output signal

Range

Connection pin on CT board

Voltage

0 ... 5 V

OUT-mV/mA

Voltage

0 ... 10 V

OUT-mV/mA

Current

0 ... 20 mA

OUT-mV/mA

Current

4 ... 20 mA

OUT-mV/mA

Thermocouple

TC J

OUT-TC

Thermocouple

TC K

OUT-TC

According to the chosen output signal different
connection pins on the mainboard are used
(OUT-mV/mA or OUT-TC).

CAUTION: Please do never connect a supply voltage to the
analog outputs as this will destroy the output.
The CT is not a 2-wire sensor!

5 Outputs and Inputs

5.1 Analog Outputs

5.1.1 Output channel 1

This output is used for the object temperature. The selection of the output signal can be done via the
programming keys [►6 Operating]. The software allows the programming of output channel 1 as an alarm
output.

5.1.2 Output channel 2 [LT/ G5/ P3/ P7 only]
The connection pin OUT-AMB is used for output of the head temperature [-20-180 °C or -20-250 °C (on

LT02H and LT10H) as 0–5 V or 0–10 V signal]. The software allows the programming of output channel 2

as an alarm output. Instead of the head temperature T
temperature T

can be selected as alarm source.

Box

also the object temperature T

Head

or electronic box

Obj

-Outputs and Inputs 61-

CT sensors can be optionally equipped with an USB-,
RS232-, RS485-, CAN Bus-, Profibus DP-, Modbus RTU- or

Ethernet-interface.
If you want to install an interface, plug the interface board
into the place provided, which is located beside the display.
In the correct position the holes of the interface match with
the thread holes of the electronic box. Now press the board
down to connect it and use both M3x5 screws for fixing it.
Plug the preassembled interface cable with the terminal
block into the male connector of the interface board.

5.2 Digital Interfaces

The Ethernet interface requires at minimum 12 V supply voltage.
Please pay attention to the notes on the according interface manuals.

5.3 Relay Outputs

The CT can be optionally equipped with a relay output. The relay board will be installed the same way as the
digital interfaces. A simultaneous installation of a digital interface and the relay outputs is not
possible. The relay board provides two fully isolated switches, which have the capability to switch
max. 60 VDC/ 42 VAC

, 0,4 A DC/AC. A red LED shows the closed switch.

RMS

-62 -

The switching thresholds are in accordance with the values for alarm 1 and 2 [►5.5 Alarms].
The alarm values are set according to the ►1.6 Factory Default Settings.

To make advanced settings (change of low- and high alarm) a digital interface (USB, RS232)
and the software is needed.

F1 (digital):

trigger (a 0 V level on F1 resets the hold functions)

F2 (analog):

external emissivity adjustment [0–10 V: 0 V ► ε = 0,1; 9 V ► ε = 1; 10 V ► ε = 1,1]

F3 (analog):

external compensation of ambient temperature/ the range is scalable via software

[0–10 V ► -40–900 °C / preset range: -20–200 °C]

F1-F3 (digital):

emissivity (digital choice via table)

5.4 Functional Inputs

The three functional inputs F1 – F3 can be programmed with the software only.

A non-connected input represents:
F1 = High | F2, F3 = Low.

[High level: ≥ +3 V…+36 V | Low level: ≤ +0,4 V…–36 V]

-Outputs and Inputs 63-

The CT has the following Alarm features:

From factory side the alarms are defined as follows:

Alarm 1

Norm. closed/ Low-Alarm

Alarm 2

Norm. open/ High-Alarm

Both of these alarms will have effect
on the LCD color:

BLUE: alarm 1 active

RED: alarm 2 active

GREEN: no alarm active

All alarms (alarm 1, alarm 2, output channel 1 and 2 if
used as alarm output) have a fixed hysterese of 2 K

(CThot: 1 K).

5.5 Alarms

5.5.1 Output channel 1 and 2 [channel 2 on LT/ G5/ P3/ P7 only]

To activate the according output channel has to be switched into digital mode. For this purpose the software
CompactConnect is required.

Visual Alarms

These alarms will cause a change of the color of the LCD display and will also change the status of the
optional relays interface. In addition the Alarm 2 can be used as open collector output at pin AL2 on the
mainboard [24 V/ 50 mA].

For extended setup like definition as low or high alarm [via change of normally open/ closed], selection of
the signal source [T
CompactConnect is needed.

Obj

, T

Head

, T

] a digital interface (e.g. USB, RS232) including the software

Box

-64 -

 The transistor acts as a switch. In case of alarm, the contact is closed.
 A load/consumer (Relay, LED or a resistor) must always be connected.
 The alarm voltage (here 24V) must not be connected directly to the alarm output (short

circuit).

5.5.2 Open collector output / AL2:

-Operating 65-

Factory Default Setting

To set the CT back to the factory default settings, please press at
first the Down-key and then the Mode-key and keep both pressed
for approx. 3 seconds.
The display will show RESET for confirmation.

Pressing the Mode button again recalls the last called function on
the display. The signal processing features Peak hold and Valley

hold cannot be selected simultaneously.

6 Operating

After power up the unit the sensor starts an initializing routine for some seconds. During this time the display
will show INIT. After this procedure the object temperature is shown in the display. The display backlight
color changes according to the alarm settings [►5.5 Alarms].

6.1 Sensor Setup

The programming keys Mode, Up and Down enable the user to set the sensor on-site. The current
measuring value or the chosen feature is displayed. With Mode the operator obtains the chosen feature, with

Up and Down the functional parameters can be selected – a change of parameters will have immediate
effect. If no key is pressed for more than 10 seconds the display automatically shows the calculated object

temperature (according to the signal processing).

-66 -

Display

Mode [Sample]

Adjustment Range

142.3C

Object temperature (after signal processing) [142,3 °C]

fixed

127CH

Head temperature [127 °C]

fixed

25CB

Box temperature [25 °C]

fixed

142CA

Current object temperature [142 °C]

fixed

ð MV5

Signal output channel 1 [0-5 V]

ð 0-20 = 0–20 mA/ ð 4-20 = 4–20 mA/ ð MV5 = 0–5 V/
ð MV10 = 0-10 V/ ð TCJ = thermocouple type J/
ð TCK = thermocouple type K

E0.970

Emissivity [0,970]

0,100 ... 1,100

T1.000

Transmissivity [1,000]

0,100 ... 1,100

A 0.2

Signal output Average [0,2 s]

A---- = inactive/ 0,1 … 999,9 s

P----

Signal output Peak hold [inactive]

P---- = inactive/ 0,1 … 999,9 s/ P oo oo oo oo = infinite

V----

Signal output Valley hold [inactive]

V---- = inactive/ 0,1 … 999,9 s/ V oo oo oo oo = infinite

u 0.0

Lower limit temperature range [0 °C]

depending on model/ inactive at TCJ- and TCK-output

n 500.0

Upper limit temperature range [500 °C]

depending on model/ inactive at TCJ- and TCK-output

[ 0.00

Lower limit signal output [0 V]

according to the range of the selected output signal

] 5.00

Upper limit signal output [5 V]

according to the range of the selected output signal

U °C

Temperature unit [°C]

°C/ °F

| 30.0

Lower alarm limit [30 °C]

depending on model

|| 100.0

Upper alarm limit [100 °C] AL2

depending on model

XHEAD

Ambient temperature compensation [head temperature]

XHEAD = head temperature/ -40,0 … 900,0 °C (for LT)
as fixed value for compensation/ returning to XHEAD
(head temperature) by pressing Up and Down together

M 01

Multidrop adress [1] (only with RS485 interface)
RS422 mode

01 … 32
RS422 (Press Down button on M01)

B 9.6

Baud rate in kBaud [9,6]

9,6/ 19,2/ 38,4/ 57,6/ 115,2 kBaud

S ON

Laser Sighting (3 VDC switch to connection pin 3V SW)

ON/ OFF This menu item appears on first position on
1M/ 2M/ 3M models.

-Operating 67-

ð MV5

Selection of the Output signal. By pressing Up or Down the different output signals can
be selected (see table).

E0.970

Setup of Emissivity. Pressing Up increases the value, Down decreases the value (also
valid for all further functions). The emissivity is a material constant factor to describe the
ability of the body to emit infrared energy [►10 Emissivity].

T1.000

Setup of Transmissivity. This function is used if an optical component (protective
window, additional optics e.g.) is mounted between sensor and object. The standard
setting is 1.000 = 100 % (if no protective window etc. is used).

A 0.2

Setup of Average time. In this mode an arithmetic algorithm will be performed to
smoothen the signal. The set time is the time constant. This function can be combined
with all other post processing functions. On 1M/ 2M/ 3M models the shortest value is
0,001 s (other models: 0,1 s) and can be increased/ decreased only by values of the
power series of 2 (0,002, 0,004, 0,008, 0,016, 0,032, ...).
If the value is set to 0.0 the display will show --- (function deactivated).

P----

Setup of Peak hold. In this mode the sensor is waiting for descending signals. If the
signal descends the algorithm maintains the previous signal peak for the specified time.
After the hold time the signal will drop down to the second highest value or will descend
by 1/8 of the difference between the previous peak and the minimum value during the
hold time. This value will be held again for the specified time. After this the signal will drop
down with slow time constant and will follow the current object temperature.
If the value is set to 0.0 the display will show --- (function deactivated).

V----

Setup of Valley hold. In this mode the sensor waits for ascending signals. The definition
of the algorithm is according to the peak hold algorithm (inverted).
If the value is set to 0.0 the display will show --- (function deactivated).

-68 -

Signal graph with P----

▬ TProcess with Peak Hold (Hold time = 1s)

▬ TActual without post processing

-Operating 69-

u 0.0

Setup of the Lower limit of temperature range. The minimum difference between lower
and upper limit is 20 K. If you set the lower limit to a value ≥ upper limit the upper limit will
be adjusted to [lower limit + 20 K] automatically.

n 500.0

Setup of the Upper limit of the temperature range. The minimum difference between
upper and lower limit is 20 K. The upper limit can only be set to a value = lower limit + 20 K.

[ 0.00

Setup of the Lower limit of the signal output. This setting allows an assignment of a
certain signal output level to the lower limit of the temperature range. The adjustment range
corresponds to the selected output mode (e.g. 0-5 V).

] 5.00

Setup of the Upper limit of the signal output. This setting allows an assignment of a
certain signal output level to the upper limit of the temperature range. The adjustment range
corresponds to the selected output mode (e.g. 0-5 V).

U °C

Setup of the Temperature unit [°C or °F].

| 30.0

Setup of the Lower alarm limit. This value corresponds to Alarm 1 [►5.5 Alarms] and is
also used as threshold value for relay 1 (if the optional relay board is used).

|| 100.0

Setup of the Upper alarm limit. This value corresponds to Alarm 2 [►5.5 Alarms] and is
also used as threshold value for relay 2 (if the optional relay board is used).

XHEAD

Setup of the Ambient temperature compensation. In dependence on the emissivity value
of the object a certain amount of ambient radiation will be reflected from the object surface.
To compensate this impact, this function allows the setup of a fixed value which represents
the ambient radiation.

-70 -

Especially if there is a big difference between the ambient temperature at the object and the
head temperature the use of Ambient temperature compensation is recommended.

M 01

Setup of the Multidrop address. In a RS485 network each sensor will need a specific
address. This menu item will only be shown if a RS485 interface board is plugged in. For
using the RS422 mode, press once the down button on M01.

B 9.6

Setup of the Baud rate for digital data transfer.

S ON

Activating (ON) and Deactivating (OFF) of an optional Sighting Laser [►3.3 Further
Accessories]. By pressing Up or Down a voltage of 3 VDC will be switched to the 3V SW

connection pin on the mainboard.

-Operating 71-

OVER

Object temperature too high

UNDER

Object temperature too low

^^^CH

Head temperature too high

vvvCH

Head temperature too low

0x

No error

1x

Head temperature probe short circuit to GND

2x

Box temperature too low

4x

Box temperature too high

6x

Box temperature probe disconnected

8x

Box temperature probe short circuit to GND

x0

No error

x2

Object temperature too high

x4

Head temperature too low

x8

Head temperature too high

xC

Head temperature probe disconnected

6.2 Error messages

The display of the sensor can show the following error messages:

LT/ G5/ P3/ P7 models:

1M/ 2M/ 3M models:

1. Digit:

2. Digit:

-72 -

7 IRmobile app

The CT sensor has a direct connection to an Android smartphone or tablet. All you have to
do is download the IRmobile app for free in the Google Play store. This can also be done
via the QR code. An IR app connector is required for connection to the device (Part-No.:
ACCTIAC).

With IRmobile you are able to monitor and analyse your infrared temperature measurement on a connected
smartphone or tablet. This app works on most Android devices running 5.0 or higher with a micro USB or
USB-C port supporting USB-OTG (On The Go). It is easy to operate: after you plug your CT device to your
phone or tablet, the app will start automatically. The device is powered by your phone. Different digital
temperature values can be displayed in the temperature time diagram. You can easily zoom-in the diagram
to see more details and small signal changes.

-IRmobile app 73-

IRmobile app features:

 Temperature time diagram with zoom function
 Digital temperature values
 Setup of emissivity, transmissivity and other parameters
 Scaling of the analog output and setting of the alarm output
 Change of temperature unit: Celsius or Fahrenheit
 Saving/loading of configurations and T/t diagrams
 Restore factory default sensor settings
 Integrated simulator

Supported for:

 Optris pyrometers: Compact series, high performance series and video thermometers
 Optris IR cameras: PI and Xi series
 For android devices running 5.0 or higher with a micro USB or USB-C port supporting USB-OTG (On

The Go)

-74 -

Insert the installation CD into the according drive on
your computer. If the autorun option is activated the
installation wizard will start automatically.
Otherwise please start CDsetup.exe from the CD­ROM. Follow the instructions of the wizard until the
installation is finished.

Alternatively, the software can also be downloaded via the Optris website under the following
link: https://www.optris.global/downloads-software

A detailed description is provided in the software manual on the software CD.

Minimum system requirements:

 Windows 7, 8, 10
 USB interface
 Hard disc with at least 30 MByte free space
 At least 128 MByte RAM
 CD-ROM drive

8 Software CompactConnect

8.1 Installation

The installation wizard will place a launch icon on the desktop and in the start menu:

[Start]\Programs\CompactConnect.

If you want to uninstall the software from your system please use the uninstall icon in the start menu.

-Software CompactConnect 75-

Main Features:

 Graphic display for temperature trends and

automatic data logging for analysis and
documentation

 Complete sensor setup and remote controlling
 Adjustment of signal processing functions
 Programming of outputs and functional inputs

-76 -

Baudrate:

99,6...115,2 kBaud (adjustable on the unit or via software)

Data bits:

8

Parity:

none

Stop bits:

1

Flow controll:

off

8.2 Communication Settings

8.2.1 Serial Interface

8.2.2 Protocol

All sensors of the CT series are using a binary protocol. Alternatively they can be switched to an ASCII
protocol. To get a fast communication the protocol has no additional overhead with CR, LR or ACK bytes.

-Software CompactConnect 77-

Old sensing head

CTex (+1)

ASCII (+4)

CTex + ASCII (+5)

0 1 4 5 New sensing head

8 9 C D

Example new sensing head:

Binary protocol:

A6FG – 22KB – 8AS0

ASCII protocol:

A6FG – 22KB – CAS0

Block1 Block2 Block3

Block1 Block2 Block3

After you have modified the head code a reset is necessary to activate the change.

[►6 Operating]

Decimal:

131

HEX:

0x83

Data, Answer:

byte 1

Result:

0 – Binary protocol
1 – ASCII-protocol

8.2.3 ASCII protocol

The models LT02, LT15, LT22, LT02H and LT10H can be switched to ASCII by changing the first figure of
block 3 of the head calibration code. This figure has to be changed from 0 to 4 (old sensing head) or 8 to C
(new sensing head). [►4.3 Exchange of the Sensing Head]

To switch to the ASCII protocol you can use also the following command:

-78 -

Decimal:

112

HEX:

0x70

Data, Answer:

byte 1

Result:

0 – Data will be written into the flash memory
1 – Data will not be written into the flash memory

8.2.4 Saving of parameter settings

After power on of the CT sensor the flash mode is active. It means, changed parameter settings will be
saved in the CT-internal Flash-EEPROM and will be kept also after the sensor is switched off.
In case settings should be changed quite often or continuously the flash mode can be switched off by using
the following command:

If the flash mode is deactivated, all settings will only be kept as long as the unit is powered. If the unit is
switched off and powered on again all previous settings are lost.
The command 0x71 will poll the current status.

You will find a detailed protocol and command description on the software CD CompactConnect in the
directory: \Commands.

-Basics of Infrared Thermometry 79-

9 Basics of Infrared Thermometry

Depending on the temperature each object emits a certain amount of infrared radiation. A change in the
temperature of the object is accompanied by a change in the intensity of the radiation. For the measurement
of “thermal radiation” infrared thermometry uses a wave-length ranging between 1 µm and 20 µm.
The intensity of the emitted radiation depends on the material. This material contingent constant is described
with the help of the emissivity which is a known value for most materials (►10 Emissivity).

Infrared thermometers are optoelectronic sensors. They calculate the surface temperature on the basis of
the emitted infrared radiation from an object. The most important feature of infrared thermometers is that
they enable the user to measure objects contactless. Consequently, these products help to measure the
temperature of inaccessible or moving objects without difficulties. Infrared thermometers basically consist of
the following components:

 lens
 spectral filter
 detector
 electronics (amplifier/ linearization/ signal processing)

The specifications of the lens decisively determine the optical path of the infrared thermometer, which is
characterized by the ratio Distance to Spot size.
The spectral filter selects the wavelength range, which is relevant for the temperature measurement. The
detector in cooperation with the processing electronics transforms the emitted infrared radiation into electrical
signals.

-80 -

10 Emissivity

10.1 Definition

The intensity of infrared radiation, which is emitted by each body, depends on the temperature as well as on
the radiation features of the surface material of the measuring object. The emissivity (ε – Epsilon) is used as
a material constant factor to describe the ability of the body to emit infrared energy. It can range between 0
and 100 %. A “blackbody” is the ideal radiation source with an emissivity of 1,0 whereas a mirror shows an
emissivity of 0,1.
If the emissivity chosen is too high, the infrared thermometer may display a temperature value which is much
lower than the real temperature – assuming the measuring object is warmer than its surroundings. A low
emissivity (reflective surfaces) carries the risk of inaccurate measuring results by interfering infrared radiation
emitted by background objects (flames, heating systems, chamottes). To minimize measuring errors in such
cases, the handling should be performed very carefully and the unit should be protected against reflecting
radiation sources.

10.2 Determination of unknown Emissivity

► First, determine the actual temperature of the measuring object with a thermocouple or contact sensor.

Second, measure the temperature with the infrared thermometer and modify the emissivity until the
displayed result corresponds to the actual temperature.

► If you monitor temperatures of up to 380 °C you may place a special plastic sticker (emissivity dots – part

number: ACLSED) onto the measuring object, which covers it completely. Now set the emissivity to 0,95

-Emissivity 81-
and take the temperature of the sticker. Afterwards, determine the temperature of the adjacent area on

the measuring object and adjust the emissivity according to the value of the temperature of the sticker.

► Cove a part of the surface of the measuring object with a black, flat paint with an emissivity of 0,98. Adjust

the emissivity of your infrared thermometer to 0,98 and take the temperature of the colored surface.
Afterwards, determine the temperature of a directly adjacent area and modify the emissivity until the
measured value corresponds to the temperature of the colored surface.

CAUTION: On all three methods the object temperature must be different from ambient temperature.

10.3 Characteristic Emissivity

In case none of the methods mentioned above help to determine the emissivity you may use the emissivity
tables ►Appendix A – Table of Emissivity for metals and Appendix B – Table of Emissivity for non-
metals. These are average values, only. The actual emissivity of a material depends on the following factors:

 temperature
 measuring angle
 geometry of the surface
 thickness of the material
 constitution of the surface (polished, oxidized, rough, sandblast)
 spectral range of the measurement
 transmissivity (e.g. with thin films)

-82 -

1,0 µm 1,6 µm 5,1 µm 8-14 µm

Aluminium non oxidized 0,1-0,2 0,02-0,2 0,02-0,2 0,02-0,1

polished 0,1-0,2 0,02-0,1 0,02-0,1 0,02-0,1
roughened 0,2-0,8 0,2-0,6 0,1-0,4 0,1-0,3
oxidized 0,4 0,4 0,2-0,4 0,2-0,4

Brass polished 0,35 0,01-0,05 0,01-0,05 0,01-0,05

roughened 0,65 0,4 0,3 0,3
oxidized 0,6 0,6 0,5 0,5

Copper polished 0,05 0,03 0,03 0,03

roughened 0,05-0,2 0,05-0,2 0,05-0,15 0,05-0,1

oxidized 0,2-0,8 0,2-0,9 0,5-0,8 0,4-0,8
Chrome 0,4 0,4 0,03-0,3 0,02-0,2
Gold 0,3 0,01-0,1 0,01-0,1 0,01-0,1
Haynes alloy 0,5-0,9 0,6-0,9 0,3-0,8 0,3-0,8
Inconel electro polished 0,2-0,5 0,25 0,15 0,15

sandblast 0,3-0,4 0,3-0,6 0,3-0,6 0,3-0,6

oxidized 0,4-0,9 0,6-0,9 0,6-0,9 0,7-0,95
Iron non oxidized 0,35 0,1-0,3 0,05-0,25 0,05-0,2

rusted 0,6-0,9 0,5-0,8 0,5-0,7

oxidized 0,7-0,9 0,5-0,9 0,6-0,9 0,5-0,9

forged, blunt 0,9 0,9 0,9 0,9

molten 0,35 0,4-0,6
Iron, casted non oxidized 0,35 0,3 0,25 0,2

oxidized 0,9 0,7-0,9 0,65-0,95 0,6-0,95

Material

typical Emissivity

Spectral response

Appendix A – Table of Emissivity for metals

-Appendix A – Table of Emissivity for metals 83-

1,0 µm 1,6 µm 5,1 µm 8-14 µm

Lead polished 0,35 0,05-0,2 0,05-0,2 0,05-0,1

roughened 0,65 0,6 0,4 0,4

oxidized 0,3-0,7 0,2-0,7 0,2-0,6
Magnesium 0,3-0,8 0,05-0,3 0,03-0,15 0,02-0,1
Mercury 0,05-0,15 0,05-0,15 0,05-0,15
Molybdenum non oxidized 0,25-0,35 0,1-0,3 0,1-0,15 0,1

oxidized 0,5-0,9 0,4-0,9 0,3-0,7 0,2-0,6
Monel (Ni-Cu) 0,3 0,2-0,6 0,1-0,5 0,1-0,14
Nickel electrolytic 0,2-0,4 0,1-0,3 0,1-0,15 0,05-0,15

oxidized 0,8-0,9 0,4-0,7 0,3-0,6 0,2-0,5
Platinum black 0,95 0,9 0,9
Silver 0,04 0,02 0,02 0,02
Steel polished plate 0,35 0,25 0,1 0,1

rustless 0,35 0,2-0,9 0,15-0,8 0,1-0,8

heavy plate 0,5-0,7 0,4-0,6

cold-rolled 0,8-0,9 0,8-0,9 0,8-0,9 0,7-0,9

oxidized 0,8-0,9 0,8-0,9 0,7-0,9 0,7-0,9
Tin non oxidized 0,25 0,1-0,3 0,05 0,05
Titanium polished 0,5-0,75 0,3-0,5 0,1-0,3 0,05-0,2

oxidized 0,6-0,8 0,5-0,7 0,5-0,6
Wolfram polished 0,35-0,4 0,1-0,3 0,05-0,25 0,03-0,1
Zinc polished 0,5 0,05 0,03 0,02

oxidized 0,6 0,15 0,1 0,1

Spectral response

Material

typical Emissivity

-84 -

1,0 µm 2,2 µm 5,1 µm 8-14 µm

Asbestos 0,9 0,8 0,9 0,95
Asphalt 0,95 0,95
Basalt 0,7 0,7
Carbon non oxidized 0,8-0,9 0,8-0,9 0,8-0,9

graphite 0,8-0,9 0,7-0,9 0,7-0,8
Carborundum 0,95 0,9 0,9
Ceramic 0,4 0,8-0,95 0,8-0,95 0,95
Concrete 0,65 0,9 0,9 0,95
Glass plate 0,2 0,98 0,85

melt 0,4-0,9 0,9
Grit 0,95 0,95
Gypsum 0,4-0,97 0,8-0,95
Ice 0,98
Limestone 0,4-0,98 0,98
Paint non alkaline 0,9-0,95
Paper any color 0,95 0,95
Plastic >50 µm non transparent 0,95 0,95
Rubber 0,9 0,95
Sand 0,9 0,9
Snow 0,9
Soil 0,9-0,98
Textiles 0,95 0,95
Water 0,93

Wood natural 0,9-0,95 0,9-0,95

Material

typical Emissivity

Spectral response

Appendix B – Table of Emissivity for non-metals

-Appendix C – Smart Averaging 85-

Signal graph with Smart Averaging function

Signal graph without Smart Averaging function

Appendix C – Smart Averaging

The average function is generally used to smoothen the output signal. With the adjustable parameter time
this function can be optimal adjusted to the respective application. One disadvantage of the average function
is that fast temperature peaks which are caused by dynamic events are subjected to the same averaging
time. Therefore those peaks can only be seen with a delay on the signal output.
The function Smart Averaging eliminates this disadvantage by passing those fast events without averaging
directly through to the signal output.

-86 -

Appendix D – Declaration of Conformity

optris CT-MA-E2019-08-A