Specifications and description

KRTM 20 High Resolution Multicolor Contrast Scanner

Dimensioned drawing
en 01-2011/06 50116669

12mm
20mm
50mm
12 - 30 V
DC 50 / 25
kHz

z Dynamic teach-in
z RGB transmitter
z Response time analog/digital (10μs/10μs
or 10μs/20μs)
z Digital switching frequency 50kHz or
25kHz
z Resolution of 70 gray levels at the digital
output
z Resolution of 400 gray levels at the analog
output
z Analog output 1 … 10mA A Light spot orientation vertical
z Changeover to the switching threshold B Optical axis
z Changeover to the analysis depth C M5/5.5mm deep
D Scanning range
z L/D switching
We reserve the right to make changes • DS_KRTM20M_hr_Tdyn_en.fm

E Front
z Pulse stretching F Head

Electrical connection
C UL US
LISTED PNP + analog NPN + analog

IEC 60947... IEC 60947... IP 67

Accessories:
(available separately)
z M12 connectors, 5-pin (KD …)
z Ready-made cables (K-D …) PNP NPN
z Interchangeable objectives
z Tool for changing objectives

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 KRTM 20

Specifications Remarks
Optical data z Approved purpose:
Scanning range with objective 1 1) 12mm ± 1mm This product may only be
Scanning range with objective 2 2) 20mm ± 2mm used by qualified
Scanning range with objective 3 1) 50mm ± 5mm personnel and must only
Light spot dimension with objective 1 1) 3.0mmx1.0mm or round light spot D = 0.5mm
Light spot dimension with objective 2 2) 4.0mmx1.2mm or round light spot D = 0.6mm be used for the approved
Light spot dimension with objective 3 1) 10.0mmx2.0mm or round light spot D = 1.0mm purpose. This sensor is
Light spot orientation vertical or horizontal not a safety sensor and is
Light source LEDs (red, green, blue) not to be used for the
Timing protection of persons.
Switching frequency digital output 25kHz/50kHz reversible (see remarks)
Response time digital output 20μs/10μs reversible (see remarks)
Response jitter digital output 10μs z With shiny objects, the
Response time of analogue output 10μs sensor is to be mounted at
Delay before start-up ≤ 250ms an angle to the object
Electrical data surface.
Operating voltage UB 12 … 30VDC (incl. residual ripple)
Residual ripple ≤ 15% of UB
Switching output PNP, NPN z Device configuration:
Function characteristics light or dark switching, reversible via button
Analog output 1 … 10mA 1. Configuration mode is
Signal voltage high/low ≥ (UB -2V)/≤ 2V activated by holding down
Output current max. 100mA the teach button during
Open-circuit current ≤ 60mA
power-on (ON LED
Indicators
After power-on: flashes).
ON LED on device set to factory settings 2. The analysis depth is
ON LED flashing slowly device not set to factory settings changed over using the
(display only for approx. 10s after power-on)
After teach-in: Delay button:
ON LED on switching threshold set to factory settings Delay LED off =
–> switching threshold in center
ON LED flashing slowly switching threshold was reconfigured 2x analysis depth
–> switching threshold close to the mark (response time 20μs)
Q/T LED flashing quickly teaching error Delay LED on =
In run mode:
ON LED on ready 1x analysis depth
Delay LED pulse stretching on/off (response time 10μs)
L/D LED light/dark switching
Q/T LED on mark detected 3. The switching threshold is
Q/T LED flashing quickly device error changed over using the
In configuration mode: L/D button:
ON LED flashing quickly device is in configuration mode
Delay LED off 2x analysis depth (response time 20μs) L/D LED off=
Delay LED on 1x analysis depth (response time 10μs) Switching threshold in
L/D LED off switching threshold in center center
L/D LED on switching threshold close to the mark
L/D LED on=
Mechanical data
Housing diecast zinc Switching threshold close
Optics cover glass to the mark
Weight 300g
Connection type M12 connector, stainless steel, 5-pin 4. Press the teach button to
end device configuration.
Environmental data
Ambient temp. (operation/storage) -25°C … +60°C/-40°C … +70°C 5. Back to factory settings:
Protection class IP 67 Simultaneously hold down
LED class 1 (acc. to EN 60825-1)
VDE safety class II the Delay button and the
Protective circuit 3) 2, 3 L/D button during power-
Standards applied IEC 60947-5-2 on to reset the sensor to
Options factory settings.
Synchronous input
PNP: Stop/Start measurement UB/0V or not connected
NPN: Stop/Start measurement 0V/UB or not connected
Synchronization delay ≤ 0.5ms
Teach input
PNP: active / not active UB/0V or not connected
NPN: active/not active 0V/UB or not connected
Teach delay ≤ 10ms
Pulse stretching 20ms, can be activated via button
Device configuration continue to press the teach button during power-on
Changeover switching threshold see remarks
Changeover response time see remarks
1) Interchangeable objective, available as accessory
2) Standard objective, state on delivery
3) 2=polarity reversal protection, 3=short-circuit protection for all outputs

Order guide
See section Preferred types

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KRTM 20 High Resolution Multicolor Contrast Scanner

Function principle of the contrast scanner

These contrast scanners are devices that can, with the aid of multiple transmitter colors (red, green, blue), distinguish between
minimal gray levels (contrasts). By means of the automatic transmitter selection after a teach-in, the optimum functional safety
for the respective contrast is determined and set by the device itself. As a result, any combination of marks or backgrounds can
be detected with optimum functional safety. Through constant measurement and regulation of the emitted light, the devices
operate with very good temperature stability. Re-teaching of the mark is, thus, no longer necessary.
Each transmitter color consists of 4 LEDs. A longish light spot with four points is formed in the focal point. This very small,
extremely bright light spot guarantees a high repeatability and positioning accuracy. For the case that the mark or background
is not optimally printed, the light spot can be focused by slightly changing the scanning distance in such a way that a
homogeneous, rectangular light spot is formed.
With this teaching type, background and mark must be placed statically below the light spot. Using the synchronization input,
the switching output can be activated or deactivated.

Controls and indicators

ON LED on ready / run mode Q/T LED on mark detected
ON LED flashing slowly device is not set to factory settings Q/T LED flashing quickly teach error or device error
(Display only for approx. 10s after power-on)
ON LED flashing quickly device is in configuration mode

Run mode: Run mode:

Delay LED pulse stretching on /off L/D LED light/dark switching
Configuration mode: Configuration mode:
Delay LED off 2x analysis depth (response time 20μs) L/D LED off switching threshold in center
Delay LED on 1x analysis depth (response time 10μs) L/D LED on switching threshold close to the mark

Signal response during teach-in

Dynamic 2-point teach

Label with marks

Open measurement window Close measurement window

Receive signal
Switching threshold in center

Switching threshold near the mark

Switching output for switching

threshold in center

Switching output for switching

threshold near the mark

Teach process
The teach process is performed with the aid of the teach button or external teach lines. The two processes work in the same way.

Operation Transmitter Indicator LED

Position the light spot on the background Red, green or blue light spot visible
Press the teach button approx. 0.5s or All colors are on Q/T, Delay and L/D LEDs flash
set the teach line to high level White light spot visible
Advance paper sheet for at least one pattern All colors are on Q/T, Delay and L/D LEDs flash
length White light spot visible
Briefly press teach button or Changeover to red, green or blue ON LED on or flashes 3x
teach line to low level Red, green or blue light spot visible Q/T LED on
Q/T LED flashing –> error
Teaching error All colors off ON LED on
start new teaching process Q/T LED flashing –> error

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 KRTM 20

Calibration - analog output 1 … 10mA

This is an uncalibrated measurement value. The current value that is output is proportional to the last contrast ascertained by
means of teach-in.
For rough calibration of the analog output, a teach-in with the following sequence is recommended .
1. Teach point on background –> on white paper.
2. Teach point on mark –> without object (into open space).

Preferred types
Selection table

KRTM 20M/P-12-6420-S12
Order code Î

Part No. 50116474

Equipment Ð
Scanning range 12mm z
20mm
50mm
Light spot orientation vertical z
horizontal
round
Optical outlet front
head z
Output wiring PNP z
NPN
analogue current
Other features static teach-in
dynamic teach-in z
synchronous input z
Additional types on request

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 Specifications and description

KRTM 20 High Resolution Multicolor Contrast Scanner

Dimensioned drawing
en 03-2014/04 50113452-01

12mm
20mm
50mm
12 - 30 V
DC 50 / 25
kHz

 Static teach-in
 RGB transmitter
 Response time analog/digital (10μs/10μs
or 10μs/20μs)
 Digital switching frequency 50kHz or
25kHz
 Resolution of 70 gray levels at the digital
output
 Resolution of 400 gray levels at the analog
output
 Analog output 1 … 10mA
We reserve the right to make changes • DS_KRTM20Mhighres_en_50113452_01.fm

A Light spot orientation vertical

 Changeover to the switching threshold B Optical axis
 Changeover to the analysis depth C M5/5.5mm deep
D Scanning range
 L/D switching
E Front
 Pulse stretching F Head

Electrical connection
PNP + analog NPN + analog

IEC 60947... IEC 60947... IP 67

Accessories:
(available separately)
 M12 connectors, 5-pin (KD …)
 Ready-made cables (K-D …) PNP NPN
 Interchangeable objectives
 Tool for changing objectives

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 KRTM 20

Specifications Remarks
Optical data  Approved purpose:
Scanning range with objective 1 1) 12mm ± 1mm This product may only be
Scanning range with objective 2 2) 20mm ± 2mm used by qualified person-
Scanning range with objective 3 1) 50mm ± 5mm nel and must only be used
Light spot dimension with objective 1 1) 3.0mmx1.0mm or round light spot D = 0.5mm
Light spot dimension with objective 2 2) 4.0mmx1.2mm or round light spot D = 0.6mm for the approved purpose.
Light spot dimension with objective 3 1) 10.0mmx2.0mm or round light spot D = 1.0mm This sensor is not a safety
Light spot orientation vertical or horizontal sensor and is not to be
Light source LEDs (red, green, blue) used for the protection of
Timing persons.
Switching frequency digital output 25kHz/50kHz reversible (see remarks)
Response time digital output 20μs/10μs reversible (see remarks)
Response jitter digital output 10μs  With shiny objects, the
Response time of analogue output 10μs sensor is to be mounted at
Delay before start-up ≤ 250ms an angle to the object sur-
Electrical data face.
Operating voltage UB 3) 12 … 30VDC (incl. residual ripple)
Residual ripple ≤ 15% of UB
Switching output PNP, NPN  Device configuration:
Function characteristics light or dark switching, reversible via button
Analog output 1 … 10mA 1. Configuration mode is
Signal voltage high/low ≥ (UB -2V)/≤ 2V activated by holding down
Output current max. 100mA the teach button during
Open-circuit current ≤ 60mA
power-on (ON LED
Indicators
After power-on: flashes).
ON LED on device set to factory settings 2. The analysis depth is
ON LED flashing slowly device not set to factory settings changed over using the
(display only for approx. 10s after power-on)
After teach-in: Delay button:
ON LED on switching threshold set to factory settings Delay LED off =
–> switching threshold in center
ON LED flashing slowly switching threshold was reconfigured 2x analysis depth
–> switching threshold close to the mark (response time 20μs)
Q/T LED flashing quickly teaching error Delay LED on =
In run mode:
ON LED on ready 1x analysis depth
Delay LED pulse stretching on/off (response time 10μs)
L/D LED light/dark switching
Q/T LED on mark detected 3. The switching threshold is
Q/T LED flashing quickly device error changed over using the L/
In configuration mode: D button:
ON LED flashing quickly device is in configuration mode
Delay LED off 2x analysis depth (response time 20μs) L/D LED off=
Delay LED on 1x analysis depth (response time 10μs) Switching threshold in
L/D LED off switching threshold in center center
L/D LED on switching threshold close to the mark
L/D LED on=
Mechanical data
Housing diecast zinc Switching threshold close
Optics cover glass to the mark
Weight 300g
Connection type M12 connector, stainless steel, 5-pin 4. Press the teach button to
end device configuration.
Environmental data
Ambient temp. (operation/storage) -25°C … +60°C/-40°C … +70°C 5. Back to factory settings:
Protection class IP 67 Simultaneously hold down
Light source free group (in accordance with EN 62471)
VDE safety class II the Delay button and the
Protective circuit 4) 2, 3 L/D button during power-
Standards applied IEC 60947-5-2 on to reset the sensor to
Certifications UL 508, C22.2 No.14-13 3) 5)
factory settings.
Options
Synchronous input
PNP: Stop/Start measurement UB/0V or not connected
NPN: Stop/Start measurement 0V/UB or not connected
Synchronization delay ≤ 0.5ms
Teach input
PNP: active / not active UB/0V or not connected
NPN: active/not active 0V/UB or not connected
Teach delay ≤ 10ms
Pulse stretching 20ms, can be activated via button
Device configuration continue to press the teach button during power-on
Changeover switching threshold see remarks
Changeover response time see remarks
1) Interchangeable objective, available as accessory
2) Standard objective, state on delivery
3) For UL applications: for use in class 2 circuits according to NEC only
4) 2=polarity reversal protection, 3=short-circuit protection for all outputs
5) These proximity switches shall be used with UL Listed Cable assemblies rated 30V, 0.5A min,
in the field installation, or equivalent (categories: CYJV/CYJV7 or PVVA/PVVA7)

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KRTM 20 High Resolution Multicolor Contrast Scanner

Order guide
The sensors listed here are preferred types; current information at Leuze webiste.
Selection table

KRTM 20M/N-20-6320-S12

KRTM 20M/C-20-6526-S12

KRTM 20M/C-20-6626-S12

KRTM 20M/N-20-3320-S12
KRTM 20M/P-20-6320-S12

KRTM 20M/P-20-3320-S12

KRTM 20M/P-50-6320-S12
Order code 

Part No. 50113435

Part No. 50113436

Part No. 50113438

Part No. 50113437

Part No. 50114202

Part No. 50114201

Part No. 50116177

Equipment 
Scanning range 12mm
20mm      
50mm 
Light spot orientation vertical     
horizontal
round  
Optical outlet front
head       
Output wiring PNP    
NPN   
analogue current  
Other features static teach-in       
dynamic teach-in
synchronous input     

Function principle of the contrast scanner

These contrast scanners are devices that can, with the aid of multiple transmitter colors (red, green, blue), distinguish between
minimal gray levels (contrasts). By means of the automatic transmitter selection after a teach-in, the optimum functional safety
for the respective contrast is determined and set by the device itself. As a result, any combination of marks or backgrounds can
be detected with optimum functional safety. Through constant measurement and regulation of the emitted light, the devices oper-
ate with very good temperature stability. Re-teaching of the mark is, thus, no longer necessary.
Each transmitter color consists of 4 LEDs. A longish light spot with four points is formed in the focal point. This very small,
extremely bright light spot guarantees a high repeatability and positioning accuracy. For the case that the mark or background
is not optimally printed, the light spot can be focused by slightly changing the scanning distance in such a way that a homoge-
neous, rectangular light spot is formed.
With this teaching type, background and mark must be placed statically below the light spot. Using the synchronization input,
the switching output can be activated or deactivated.

Buy: www.ValinOnline.com | Phone 844-385-3099 | Email: CustomerService@valin.com

 KRTM 20

Controls and indicators

ON LED on ready / run mode Q/T LED on mark detected
ON LED flashing slowly device is not set to factory settings Q/T LED flashing quickly teach error or device error
(Display only for approx. 10s after power-on)
ON LED flashing quickly device is in configuration mode

Run mode: Run mode:

Delay LED pulse stretching on /off L/D LED light/dark switching
Configuration mode: Configuration mode:
Delay LED off 2x analysis depth (response time 20μs) L/D LED off switching threshold in center
Delay LED on 1x analysis depth (response time 10μs) L/D LED on switching threshold close to the mark

Signal response during teach-in

Static 2-point teach

Label with marks

1. Teach point on background 2. Teach point on mark

Receive signal
Switching threshold in center

Switching threshold near the mark

Switching output for switching threshold

in center

Switching output for switching threshold

near the mark

Teach process
The teach process is performed with the aid of the teach button or external teach lines. The two processes work in the same way.

Operation Transmitter Indicator LED

Position the light spot on the background Red, green or blue light spot visible
Press the teach button approx. 0.5s or All colors are on Q/T, Delay and L/D LEDs flash
set the teach line to high level White light spot visible
Position the light spot on the mark All colors are on Q/T, Delay and L/D LEDs flash
White light spot visible
Briefly press teach button or Changeover to red, green or blue ON LED on or flashes 3x
teach line to low level Red, green or blue light spot visible Q/T LED on
Q/T LED flashing –> error
Teaching error All colors off ON LED on
start new teaching process Q/T LED flashing –> error

Calibration - analog output 1 … 10mA

This is an uncalibrated measurement value. The current value that is output is proportional to the last contrast ascertained by
means of teach-in.
For rough calibration of the analog output, a teach-in with the following sequence is recommended .
1. Teach point on background –> on white paper.
2. Teach point on mark –> without object (into open space).

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 KRTM 20 Contrast scanner RGB

Dimensioned drawing

12mm
20mm
50mm
12 - 30 V
DC 25 kHz

z Freely programmable via protocol interface

z Freely adjustable transmitter colour, amplifi-
cation and switching threshold
z Response time digital/analogue: 20µs/
6.25µs
z Analogue and digital output
z Parameterisation input

A Light spot orientation vertical

B Optical axis
C M5/5.5mm deep
D Scanning range
E Front
F Head

Electrical connection
C UL US
We reserve the right to make changes • fmt_krt10gb.fm

LISTED

IEC 60947... IEC 60947... IP 67

Accessories:
(available separately)
z M12 connectors, 5-pin (KD …)
z Ready-made cables (K-D …)
z Interchangeable objectives
z Tool for changing objectives

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 KRTM 20

Specifications Tables
Optical data
Scanning range with objective 1 (accessory) 12mm ± 1mm
Scanning range with objective 2 20mm ± 2mm
Scanning range with objective 3 (accessory) 50mm ± 5mm
Light spot dimensions with objective 1 3.0mmx1.0mm
Light spot dimensions with objective 2 4.0mmx1.2mm
Light spot dimensions with objective 3 10.0mmx2.0mm
Light spot orientation vertical
Light source LEDs (red, green, blue)
Timing
Digital switching frequency max. 25kHz
Response time digital/analogue min. 20µs/6.25µs
Delay before start-up ≤ 250ms
Electrical data
Operating voltage UB 12 … 30VDC (incl. residual ripple)
Residual ripple ≤ 15% of UB
Switching output PNP
Function characteristics light switching
Analogue output 1 … 10mA
Signal voltage high/low ≥ (UB-2V)/≤ 2V
Output current max. 100mA
Bias current ≤ 60mA
Indicators
LED green 1 ON "ready"
LED green 2 without function
LED green 3
LED yellow
without function
Q/T "object detected"
Diagrams
LED yellow flashing Q/T "device error, teach error"
Keyboard
Delay button locked (see remarks)
L/D button locked (see remarks)
Teach button locked
Mechanical data
Housing diecast zinc
Optics cover glass
Weight 300g
Connection type M12 connector, stainless steel, 5-pin
Environmental data
Ambient temp. (operation/storage) -25°C … +60°C/-40°C … +70°C
Protection class IP 67
LED class 1 (acc. to EN 60825-1)
VDE safety class II
Protective circuit 1) 2, 3
Standards applied IEC 60947-5-2
Options
Input for parameterisation
PNP: active / not active UB/0V or not connected
1) 2=polarity reversal protection, 3=short-circuit protection for all outputs

Order guide Remarks

See section 4. Preferred types z With shiny objects, the
sensor is to be mounted at
an angle to the object
surface.
z The objectives and
objective covers must not
be removed.
z Keyboard is disabled.
z Button LEDs must be
"OFF".
z L/D and Delay buttons
- KRTM 20…-0001-S12:
Dynamic keyboard lock-
ing (operable for approx.
10s after power-on).
- KRTM 20…-0002-S12:
Static keyboard locking
(not operable).

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KRTM 20

1. Function principle of the contrast scanner

This contrast scanner is a device which, with the aid of multiple transmitter colours (red, green, blue), can differentiate between
extremely small differences in contrast (grey tones). A protocol interface allows the transmitter colour, amplification and switching
threshold to be freely programmed. Additionally, all internal values (including analogue value) can be read back via this protocol
interface.
As a result, the primary control can influence all sensor properties and also read back the actual measurement values in digital
form. The switching threshold can also be freely adapted.
Once parameterisation has been completed, the sensor functions as a standard contrast scanner and outputs the measurement
values via the analogue output and switching output.
Each transmitter colour consists of 4 LEDs. A longish light spot with four points is formed in the focal point.
This very small, extremely bright light spot guarantees a high repeatability and positioning accuracy. For the case that the marker
or background is not optimally printed, the light spot can be focused by slightly changing the scanning distance in such a way that
a homogeneous, rectangular light spot is formed.

2. Controls and indicators

LED ON (green) for "Ready" LED Q/T (yellow) for "Object detected"
and "Error display" (flashing)

LED Delay (green) without function

(LED=OFF)
LED L/D (green) without function
(LED=OFF)

3. Signal response
Data pulses: 3ms = 1, 6ms = 0 (High level)
Pause = 3ms (Low level)
Adjustable values: Switching threshold: 0 … 127 (Bit0 … Bit6)
Transmitter colour: 1 … 3 (Bit0 … Bit1), 1 = Red, 2 = Green, 3 = Blue
Amplification level: 0 … 8 (Bit0 … Bit7)
Analogue value: 0 … 255 (Bit0 … Bit7)

Parameterisation of switching threshold and transmitter colour:

A Start
B Switching threshold
C Colour = blue
D Pause
E Request
F Amplification level 7

Request for switching threshold:

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 KRTM 20
Acknowledgement of switching threshold and transmitter colour:

Parameterisation of amplification level:

A Start
B Switching threshold
C Colour = blue
D Pause
E Request
F Amplification level = 7
G Analogue value = 129

Request for amplification level and analogue value:

Acknowledgement of amplification level and analogue value:

4. Preferred types
Selection table
KRTM 20M/V-20-0001-S12

KRTM 20M/V-20-0002-S12
Part No. 500 35674

Part No. 501 09183

Order code Î

Equipment Ð
Scanning range 12mm
20mm z z
50mm
Transmitter colour RGB z z
green
Light spot orientation vertical z z
horizontal
round
Optical outlet front
head z z
Output wiring PNP z z
NPN
analogue current z z
Other features programmable via z z
protocol interface
static keyboard locking z
dynamic keyboard locking z
Additional types on request

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 Leuze electronic
KRTM 20 Cut-Marking System

Dimensioned drawing

20mm

12 - 30 V
DC 25 kHz

z Static teach-in procedure

z Can store 128 data records
z Response time digital/analogue: 20µs/
6.25µs
z 3 transmitters in the colours red, green, blue
z Programming via teach-in button

A Light spot orientation vertical

B Optical axis
C M5/5.5mm deep
D Scanning range
E Front
F Head

Electrical connection
ISO C UL US
9001 LISTED
We reserve the right to make changes • fmt_krt08e.fm

IEC 60947... IEC 60947... IP 67

Accessories:
(available separately)
z M12 connectors, 5-pin (KD …)
z Ready-made cables (K-D …)
z Interchangeable objectives
z Tool for changing objectives DSA Data set acknowledgement (Data Set Acknowledge)
DSS Data set selection (Data Set Select)

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 Leuze electronic
KRTM 20

Specifications Tables
Optical data
Scanning range with objective 1 (accessory) 12mm ± 1mm
Scanning range with objective 2 20mm ± 2mm
Scanning range with objective 3 (accessory) 50mm ± 5mm
Light spot dimensions with objective 1 3.0mmx1.0mm
Light spot dimensions with objective 2 4.0mmx1.2mm
Light spot dimensions with objective 3 10.0mmx2.0mm
Light spot orientation vertical
Light source LEDs (red, green, blue)
Timing
Digital switching frequency max. 25kHz
Response time digital/analogue min. 20µs/6.25µs
Delay before start-up ≤ 250ms
Electrical data
Operating voltage UB 12 … 30VDC (incl. residual ripple)
Residual ripple ≤ 15% of UB
Switching output PNP
Function characteristics light or dark switching, reversible via button
Analogue output 1 … 10mA
Signal voltage high/low ≥ (UB-2V)/≤ 2V
Output current max. 100mA
Bias current ≤ 60mA
Indicators
LED green 1 ON "ready"
LED green 2 "ON/OFF" delay
LED green 3 L/D "light/dark switching"
LED yellow
LED yellow flashing
Q/T "object detected"
Q/T "device error, teach error"
Diagrams
Keyboard
Release via bit 9 of the data protocol
Mechanical data
Housing diecast zinc
Optics cover glass
Weight 300g
Connection type M12 connector, stainless steel, 5-pin
Environmental data
Ambient temp. (operation/storage) -25°C … +60°C/-40°C … +70°C
Protection class IP 67
LED class 1 (acc. to EN 60825-1)
VDE safety class II
Protective circuit 1) 2, 3
Standards applied IEC 60947-5-2
Options
Input for data-record selection
PNP: active / not active UB/0V or not connected
Pulse stretching 20ms, can be activated via button
1) 2=polarity reversal protection, 3=short-circuit protection for all outputs

Order guide Remarks

See section 5. Preferred types z With shiny objects, the
sensor is to be mounted at
an angle to the object
surface.
z The objectives and
objective covers must not
be removed.

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 Leuze electronic
KRTM 20

1. Method of function of the cut-marking system

With this contrast scanning system, 128 data records can be stored in the sensor in zero-voltage-safe memory. A simple and asyn-
chronous protocol is used for data-record selection and assignment. The transmission rate is specified by the controller by means
of the start-bit pulse width. As a result, the contrast scanning system can work together with any controller system. A standardised
serial interface, e.g. RS 232, is not required as communication is realised via standard PNP signals. Adjustment is performed by
means of static teach-in via the keyboard, i.e. background and mark must be statically positioned below the light spot.
Contrast detection is achieved with the aid of multiple transmitter colours (red, green, blue). This allows the detection of minimal
differences in contrast (grey tones). Each transmitter colour consists of 4 LEDs. A longish light spot with four points is formed in
the focal point. This very small, extremely bright light spot guarantees a high repeatability and positioning accuracy. For the case
that the marker or background is not optimally printed, the light spot can be focused by slightly changing the scanning distance in
such a way that a homogeneous, rectangular light spot is formed.

2. Controls and indicators

LED ON (green) for "Ready" LED Q/T (yellow) for "Object detected"
and "Error display" (flashing)

LED Delay (green) for pulse stretching

20ms (LED=ON)
LED L/D (green) for dark switching
(LED=ON)

3. Protocol procedure for selecting a data record

- 1. The sensor system determines the period length T (T = n*10ms) from the start bit. The start bit must be a multiple of
10ms. Maximum period duration Tmax = 200ms.
- 2. A pause lasting 3T follows the start bit.
- 3. Transmission of bit 9 ... bit 0 (evaluation of the level in the middle of the period)
- 4. Acknowledgement of the data record following reception of bit 0. The sensor system repeats the entire protocol (start bit +
3T + bit 9 ... bit 0) at the switching output.
- 5. During data-record selection, mark detection is not active.

Data-record selection by the controller via pin 5 and

acknowledgement of the data record by the sensor system via pin 4 (switching output Q):

Bit 9 - button lock

(1=all buttons disabled, 0=all buttons enabled)
Bit 8 - no function
Bit 7 - no function
Bit 6 - most significant bit of the data-record number
(1=high level, 0=low level) Start bit

Bit 0 - least significant bit of the data-record number

(1=high level, 0=low level)

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 Leuze electronic
KRTM 20

4. Teach process
The teach process is performed with the aid of the Teach button. The keyboard is enabled via bit 9.

Operation Transmitter Indicator LED

Position the light spot on the background Red, green or blue light spot visible
Press the Teach button approx. 1s All colours are on All LEDs flash
White light spot visible
Position the light spot on the marker All colours are on All LEDs flash
White light spot visible
Press the Teach button approx. 1s Changeover to red, green or blue ON (green) illuminated
Red, green or blue light spot visible Q/T (yellow) off
Q/T (yellow) flashing (error)
Teaching error All colours off ON (green) illuminated
start new teaching process Q/T (yellow) flashing (error)

S Signal response during teach-in

Label
Teach button
Switching threshold
Received signal

LED Q/T
Switching output with light switching
Switching output with dark switching

5. Preferred types
Selection table
KRTM 20M/V-20-0004-S12
Part No. 500 41007

Order code Î

Equipment Ð
Scanning range 12mm
20mm z
50mm
Transmitter colour RGB z
green
Light spot orientation vertical z
horizontal
round
Optical outlet front
head z
Output wiring PNP z
NPN
analogue current z
Other features cut-marking system z
can store 128 data records z
static teach-in z
teach-in, background
synchronous input

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 KRTM 20M/N-20-0084-S12 Cut-marking system

Dimensioned drawing
en 02-2012/10 50118529

20mm

12 - 30 V
DC 80 kHz

 Dynamic teach-in process

 Can store 128 data records
 Programming via teach-in via button or
teach input (pin 5)
 Remote control after teach-in
 Small, round light spot (1 of 4 LEDs)
We reserve the right to make changes • DS_KRTM20MN200084S12_en_50118529.fm

A Light spot orientation vertical

B Optical axis
C M5/5.5mm deep
D Scanning range
E Front
F Head

Electrical connection

IEC 60947... IEC 60947... IP 67

Accessories:
(available separately)
 M12 connectors, 5-pin (KD …)
 Ready-made cables (K-D …)
 Interchangeable objectives
 Tool for changing objectives DSA Data set acknowledgment (Data Set Acknowledge)
DSS Data set selection (Data Set Select)

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 KRTM 20M/N-20-0084-S12

Specifications Tables
Optical data
Scanning range with objective 1 (accessory) 11mm (in focus mode)
Scanning range with objective 2 18mm (in focus mode)
Scanning range with objective 3 (accessory) 44mm (in focus mode)
Light spot dimensions with objective 1 Ø 0.5mm
Light spot dimensions with objective 2 Ø 0.6mm
Light spot dimensions with objective 3 Ø 1.0mm
Light source LEDs (red, green, blue)
Timing
Clock frequency 160kHz
Switching frequency 80kHz
Analysis depth 1
Response time 6.75μs
Jitter 6.75μs
Delay before start-up ≤ 250ms
Electrical data
Operating voltage UB 12 … 30VDC (incl. residual ripple)
Residual ripple ≤ 15% of UB
Switching output NPN
Function 1. Operational function light or dark switching, reversible via button
2. Remote control 2Hz pulse sequence (after faulty teach-in via pin 5 or button)
Analog output 1 … 10mA
Signal voltage high/low ≥ (UB -2V)/≤ 2V
Output current max. 100mA
Open-circuit current ≤ 100mA
Indicators
LED green 1 ON "ready"
LED green 2 "ON/OFF" delay
LED green 3 L/D "light/dark switching"
Yellow LED Q/T "object detected"
Yellow LED, flashing Q/T "device error, teach error" Diagrams
Keyboard
Release via bit 9 of the data protocol
Mechanical data
Housing diecast zinc
Optics cover glass
Weight 300g
Connection type M12 connector, stainless steel, 5-pin
Environmental data
Ambient temp. (operation/storage) -25°C … +60°C/-40°C … +70°C
Protection class IP 67
Light source exempt group (in acc. with EN 62471)
VDE safety class II
Protective circuit 1) 2, 3
Standards applied IEC 60947-5-2
Options
Input for data-record selection
NPN: active/not active 0V/UB or not connected Remarks
Teach-in input
NPN: active/not active 0V/UB or not connected (for function see item 4)  Approved purpose:
Synchr. input This product may only be
NPN: active/not active 0V/UB or not connected (for function see item 4) used by qualified person-
Pulse stretching 10ms, can be activated via button nel and must only be used
Remote control 2Hz on switching output pin 4 (after teaching error)
acknowledgement of the teaching error, see pt.4. Teach for the approved purpose.
event This sensor is not a safety
Compensation active temperature and LED compensation through sensor and is not to be
reference receiver used for the protection of
1) 2=polarity reversal protection, 3=short-circuit protection for all outputs persons.
 With shiny objects, the
sensor is to be mounted at
an angle to the object
Order guide surface.
 The objectives and
See section 5. Preferred types
objective covers must not
be removed.
 This data sheet applies for
device firmware with pro-
duction date after
1210xxxxxxx (year=2012,
month=October).

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KRTM 20M/N-20-0084-S12

1. Method of function of the cut-marking system

With this contrast scanning system, 128 data records can be stored in the sensor in zero-voltage-safe memory. A simple and
asynchronous protocol is used for data-record selection and assignment. The transmission rate is specified by the controller by
means of the start-bit pulse width. As a result, the contrast scanning system can work together with any controller system. A
standardized serial interface, e.g. RS 232, is not required as communication is realized via standard NPN signals.
Setting is performed with dynamic teach-in via the keyboard or teach input (pin 5). When teach-in starts, a measurement window
opens and closes when teach-in ends. The minimum and maximum values are determined and the switching threshold is set in
the center.
Contrast detection is achieved with the aid of multiple transmitter colors (red, green, blue). This allows the detection of minimal
differences in contrast (gray tones). Each transmitter color consists of 1 LED. A round light spot is formed in the focal point. This
very small, extremely bright light spot guarantees a high repeatability and positioning accuracy.
The system features a reference receiver which ensures temperature and LED compensation. This leads to a very stable long-
term behavior. The contrast scanners are not calibrated against reference contrasts.

2. Controls and indicators

LED ON (green) for "Ready" LED Q/T (yellow) for "Object detected"
and "Error display" (flashing)

LED delay (green) for pulse stretching

10ms (LED=ON)
LED L/D (green) for dark switching
(LED=ON)

In the factory settings, the keyboard is enabled.

3. Protocol procedure for selecting a data record

- 1. The sensor system determines the period length T (T = n*5ms) from the start bit. The start bit must be a multiple of
5ms. Maximum period duration Tmax = 100ms.
- 2. A pause lasting 3T follows the start bit.
- 3. Transmission of bit 9 ... bit 0 (evaluation of the level in the middle of the period).
- 4. Acknowledgment of the data record following reception of bit 0. The sensor system repeats the entire protocol
(start bit + 3T + bit 9 ... bit 0) at the switching output.
- 5. During data-record selection, mark detection is not active.

Data-record selection by the controller via pin 5 and acknowledgment of the data record by the sensor
system via pin 4 (switching output Q):

Bit 9 - button lock

(0V = all buttons disabled, UB = all buttons enabled1))
Bit 8 - no function
Bit 7 - no function
Bit 6 - most significant bit of the data-record number
(0V = active, UB = inactive) Start bit

Bit 0 - least significant bit of the data-record number

(0V = active, UB = inactive)

1) Factory setting

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 KRTM 20M/N-20-0084-S12

4. Teach process
The teach event is performed with the aid of the teach button or the teach input (pin 5).
Teach-in via teach button
The keyboard is enabled via bit 9.
Operation Transmitter Indicator LED
Position the light spot on the background Red, green or blue light spot visible
Press the teach button approx. 0.5s All colors are on All LEDs flash
White light spot visible
Move the light spot onto or over the mark All colors are on All LEDs flash
White light spot visible
Press the teach button approx. 0.5s Changeover to red, green or blue ON (green) illuminated
Red, green or blue light spot visible Q/T (yellow) off
Q/T (yellow) flashing (error)
Teaching error All colors off ON (green) illuminated
start new teaching process Q/T (yellow) flashing (error)

Teach-in via teach input (pin 5)

Pulse> 200ms starts the dynamic teach-in.

Rising edge closes the teach window

Pulse > 200ms opens the teach window

Acknowledgment of a teaching error after teach-in (pin 5)

One pulse <2ms acknowledges the teaching error and activates the last valid teach values.

Pulse < 2ms

5. Preferred types
Selection table
KRTM 20M/N-20-0084-S12
Part no. 50119540

Order code 

Equipment 
Scanning range 11mm
(in focus mode) 18mm 
44mm
Transmitter color RGB 
green
Light spot orientation vertical
horizontal
round 
Optical outlet Front
Head 
Output wiring PNP
NPN 
analogue current
Other features cut-marking system 
can store 128 data records 
dynamic teach-in 
teach-in, background
synchronous input 

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