SKF TKRS 21 User manual

Instructions for use
Bedienungsanleitung
Instrucciones de uso
Mode d’emploi
Manuale d’istruzioni
Instruções de uso
Инструкция по эксплуатации
使用说明书
SKF TKRS 21 & 31

EN English 2
DE Deutsch 28
ES Español 54
FR Français 80
IT Italiano 106
PT Português 132
RU Русский 158
ZH 中文184

2 EN
Safety precautions ...............................................................................4
EC Declaration of conformity ................................................................6
1. Instructions for use........................................................................7
2. Technical data..............................................................................10
3. Getting started ............................................................................11
4. General usage..............................................................................12
4.1 Flashes per minute...............................................................................13
4.2 Laser mode (TKRS 31 only)................................................................14
4.3 Trigger (TKRS 31 only) ........................................................................16
4.3.1 Trigger plug................................................................................16
4.3.2 Trigger connection ....................................................................17
4.3.3 Trigger input ..............................................................................17
4.3.4 Trigger output............................................................................18
4.4 Phase mode ..........................................................................................19
4.4.1 Standard operating mode........................................................19
4.4.2 Quick phase shift.......................................................................19
4.4.3 “pro” operating mode (TKRS 31 only)....................................20
4.4.4 Slow motion function ...............................................................20
4.4.5 Delay function ...........................................................................21
4.5 Brightness .............................................................................................22
4.6 Torch mode............................................................................................23
4.7 Settings..................................................................................................24
4.8 Memory (TKRS 31 only)......................................................................26
4.9 Bluetooth (TKRS 31 only) ...................................................................26
5. Symbols.......................................................................................27
6. Troubleshooting...........................................................................28
7. Spare parts and accessories.........................................................28
Table of contents
Original instructions

3EN
WARNING LASER RADIATION
P
=1mW l = 650nm IEC 60825-1:2007
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
READ THIS FIRST
Safety precautions
Read this instruction for use fully. Follow all safety precautions to avoid
personal injury or property damage during equipment operation.
SKF cannot be responsible for damage or injury resulting from unsafe
product use, lack of maintenance or incorrect equipment operation. In case
of any uncertainties as regards the use of the equipment contact SKF.
This device is used for inspecting the movement of rotating and vibrating
objects. It may only be used in accordance with these instructions.
The device must not be opened. Modifications to the device are not
permitted. The manufacturer shall not be liable for damage resulting from
incorrect use or use contrary to the intended use. Warranty claims will also
be invalidated in this event.
WARNING:
• Moving objects appear still or in slow motion in stroboscopic light.
• Do not touch such objects under any circumstance.
• The device may not be used in potentially explosive areas.
• Stroboscopic light can trigger epileptic seizures in persons at risk.
• Never direct the LED beam at people or animals and do not stare directly
at the beam.

4 EN
• Laser class 2
The SKF Stroboscope TKRS 31 is fitted with a class 2 laser.
This is located at the front of the device.
The laser beam can damage eyes.
For this reason, do not stare directly at the laser beam and never direct it
at people or animals.
Wavelength: 650 nm, output: 1 mW.
CAUTION:
Flashing lights can cause retina damage!
• The SKF Stroboscope TKRS 31 is fitted with 6 LEDs.
• The SKF Stroboscope TKRS 21 is fitted with 7 LEDs.
These produce potentially dangerous optical radiation, which can cause
retina damage. Do not stare directly at the light and never direct it at
people or animals.
Warranty void!
• Do not expose the equipment to rough handling or heavy impacts.
• Always read and follow the operating instructions.
• Opening the housing of the instrument may result in hazardous
mishandling and voids warranty.
• The equipment should not be used in areas where there is a risk for
explosion.
• Do not expose the equipment to high humidity or direct contact with
water.
• All repair work should be performed by an SKF repair shop.
Correct disposal!
• =The electronic components in the device contain environmentally
harmful substances.
They must be disposed of in accordance with the environmental
regulations in the country of use.
NOTE:
• Suitable for use in residential, commercial and industrial area.

5EN
EC Declaration of conformity
We, SKF Maintenance Products, Meidoornkade 14, 3992 AE Houten,
The Netherlands herewith declare under our sole responsibility that the
products described in these instructions for use, are in accordance with the
conditions of the following Directive(s):
EMC Directive 2014/30/EU
ROHS DIRECTIVE 2011/65/EU
and are in conformity with the following standards:
DIN EN 61326-1:2018
DIN EN 61010-1:2011
Safety requirements for electrical equipment for measurement, control
and laboratory use.
EN 62471:2009
ETSI EN 300 328 V2.1.1
EN 62311 (2008)
ETSI EN 301 489-1 v2.1.1 (2016-11)
ETSI EN 301 489-17 v3.1.1 (2017-02)
Emission
EN 61000-6-3:2011
EN 55011:2016+A1:2017
EN 55032:2015
Immunity
EN 61000-6-2:2005
EN 61000-4-2:2009
EN 61000-4-3:2006 + A1:2008 + A2:2010
EN 61000-4-4:2012
EN 61000-4-6:2014
For TKRS 31 only:
The laser is classified in accordance with the EN 60825-1:2015
EU RED 2014/53/EU
BlueTooth LE: FCC ID A8TBM78ABCDEFGH
Houten, The Netherlands, May 2019
Mrs. Andrea Gondová
Manager Quality and Compliance

6 EN
1. Instructions for use
These operating instructions are an integral part of the device. They must be
stored in an easily accessible location and passed on to subsequent users.
Ask your supplier if there is something you do not understand.
WARNING:
Read the operating instructions thoroughly and follow the instructions
provided. These operating instructions contain important information about
installing, starting up and operating the stroboscope.
Pay particular attention to the safety information and warnings to prevent
injuries and product damage.
The manufacturer reserves the right to continue to develop this device
without documenting all developments. Your supplier will be pleased to
inform you as to whether these operating instructions are current.
Content of the box:
• Stroboscope:
SKF Stroboscope TKRS 31 with auto-sync laser function
or SKF Stroboscope TKRS 21
• Operating instructions
• 3 batteries AA (All types, rechargeable too)
• Reflective tapes and trigger plug (only with TKRS 31)
• Case
Description:
A- ON OFF Button
B- Batteries compartment: 3 batteries AA must be used
C- 6/7 LED’s + Laser in/out
D- External trigger plug (only on TKRS 31)

7EN
B
C
A
D
Fig. 1 – Stroboscope SKF TKRS 21 & 31
General aspect of the device
Indication of 5
different modes
Selected mode
Direct access
button function
Battery status /
PRO mode
Value (like here
primary unit)
Secondary Value
(like here, in
another unit)
Chosen mode (from
direct access button)
Direct access
button function
Input laser or trigger
BlueTooth status
Fig. 2 – Wireframe

8 EN
 
 

1. Direct access button left
2. Direct access button right
3. Scroll wheel to adjust values
4. Click center wheel to change mode
Fig. 3 – Buttons

9EN
2. Technical data
Designation TKRS 21 & 31
Flash rate range 30 to 300 000 flashes per minute (f/min.)
Flash rate accuracy ±0,005% (± 1 digit at 23 °C (73 °F))
Flash setting and display
resolution
±0,1 (30 to 999,9 f/min.)
±1,0 (1 000 to 300 000 f/min.)
Tachometer range 30 to 300 000 r/min.
Tachometer accuracy ±0,02 % or ±1 digit whichever is greater
Tachometer distance up to 2 m at +/- 45° angle
Flash source TKRS 21: 7 LED’s; TKRS 31: 6 LED’s
Brightness
(Flash duration)
adjustable: 0,2°/ 1 µs whichever is bigger –
5°/ 2 000 µs whichever is smaller
Light power >5600 Lux
at 3° flash duration and 0,3 m (12 in) distance
Flash colour approx. 5 000 – 8 000 K
Power source 3 × AA batteries (included)
Run time ca. per charge TKRS 21: ca. 3:00 h @ 1° (100% display brightness)
ca. 6:45 h @ 0,2° (20% display brightness)
TKRS 31: ca. 3:45 h @ 1° (100% display brightness)
ca. 8:15 h @ 0.2° (20% display brightness)
Display Multi-line backlight TFT
Display update Continuous
External trigger input (TKRS 31 only): Input: 3 - 30 V / max. 5 mA (NPN)
Output: up to 30V / max 50 mA (NPN)
External trigger connection TKRS 31: Plug 3,5 mm (included)
EXTL. trigger range (TKRS 31 only) 30 to 300 000 f/min
Controls Direct selector switches and rotary/push knob
Signal modification Edge selection, Divider, Delay
Housing material ABS (plastics)
Instrument dimensions 225 × 78 × 50 mm (8.9 × 3 × 2 in)
Case dimensions 260 × 85 × 180 mm (10.2 × 3.3 × 7.1 in)
Instrument weight
(incl. batteries)
TKRS 21: 0,29 kg (0.64 lb)
TKRS 31: 0,3 kg (0.65 lb)
Total weight TKRS 21: 0,78 kg (1.7 lb)
TKRS 31: 0,79 kg (1.7 lb)
Operating temperature 0 to 40 °C (32 to 104 °F)
Storage temperature –20 to +45 °C (–4 to +113 °F)
Type of protection for
indication only
IP30

10 EN
3. Getting started
• Unscrew the battery compartment screw.
• Insert all three AA batteries respecting the polarity.
• Close the lead and screw back the screw.
• Start up: Press the red ON/OFF button.
• Anytime when the screen below is displayed, press the rotary wheel to
start the flashing.
• The device will start to flash straightaway. For this reason, do not direct it
at people or animals.
The device will flash at the frequency that was set most recently.
Please follow the steps below when setting up the device:
Direct the device at a moving object and turn the scrolling wheel to adjust the
flashing rate.
The display shows the selected flash frequency in the unit that was set most
recently (Hz or FPM).
• If the flash frequency coincides with the frequency of the motion, a static
image appears.
Serial number and Firmware version 5x
Logo
Product name
& version
Firmware version
Fig. 4 – Startup screen

11EN
4.
G a  a
The stroboscope offers five different menus to operate the stroboscope.
By pressing the wheel (button 4) the stroboscope moves from one menu to
the next.
Sy  Nm Dm  
FPM / Trigger Main operating menu to set the flash rate
(FPM – flash per minute) or use the laser or
trigger to determine the flashing speed.
The trigger menu is activated automatically when
a trigger is connected.
Phase / Delay /
Slowmotion
Menu to change the phase of the flash.
While keeping the same flash rate, adjusting the
phase allows to move the frozen image.
In the “pro” operating mode (TKRS 31 only), the
“delay” and “slowmotion” function can be accessed.
Brightness Menu to adjust the brightness / duration of the
flash.
Torch Menu to use the stroboscope as a torch light.
Setting Menu to change the settings of the stroboscope to
the preferences of the operator.
The stroboscope offers a standard operating menu and a “pro” operating
menu. The top right of the display indicates if the “pro” operating mode is
activated. The “pro” mode is available for TKRS 31 only and can be activated/
deactivated in the setting menu.

12 EN
4.1 Flashes per minute
After the starting the instrument, the stroboscope is by default in the mode
“FPM” (flashes per minute).
Adjust flashing rate by
scrolling the wheel
Scrolling speed can be
toggled between fast and slow
by pressing button 2
Fig. 5 – Flashes per minute (FPM)
The flash rate can be changed by rotating the wheel (button 3).
To quicker find the right flash rate, the rate of change can be influenced by
A. Toggling the adjustment speed by pressing button 2.
B. the speed of rotating the wheel (button 3). Faster rotations have a faster
change rate, while slower rotations allow precise adjustments.
The change rate for fast adjustments can be customised in the settings.

13EN
4.2 Laser mode (TKRS 31 only)
The laser mode allows the stroboscope to flash at the frequency that is
measured by the built-in laser tachometer. The laser requires a reflective
surface mounted on the rotating machine such as the supplied reflective
tape. Using the laser helps to quickly determine the speed of the rotating
object and achieving a permanently frozen image even in the presence of
varying speeds.
The laser can be activated by two methods:
A) Short press (< 0,5 s) on button 1 “laser” activates the laser and starts a
continuous measurement. Another short press turns the laser off.
B) Long and continuous press (> 0,5 s) on button 1 “laser” activates the
laser as long as the button is pressed.
A red laser symbol on the screen indicates that the laser is active.
WARNING:
Never point the laser at people, animals or mirror surfaces. The laser beam
can damage eyes.
During the laser measurement, the stroboscope is flashing at the same speed
as measured by the tachometer. As indication, when the frequency is stable
(±5%) for more than 2 seconds, it is used as a reference of flashing rate after
the laser is switched off.
After the laser measurement, the statistics of the measurement are shown
(min, max, average and last measurement) and the stroboscope continuous
to flash at the speed of the average measurement.

14 EN
Options to activate laser
A) short press: < 0,5 sec:
click on /click off
B) press longer than 0,5 sec:
> laser is activated as long as
button is pressed;
laser is turned off after release
When laser is activated.
The symbols turn to red and the
rpm value is overruled by the laser.
Fig. 6 – Laser activated
When laser is activated. The symbols
turn to red and the rpm value is
overruled by the laser. In case no
signal is detected “---” is shown.
By pressing the soft button again,
you stop the laser.
The display shows the min/max/avg.
Fig. 7 – No signal Fig. 7 – Laser stopped

15EN
No laser signal
If no laser signal is found, dash sign indicate the missing signal and
stroboscope is not flashing.
4.3 Trigger (TKRS 31 only)
The device has the option of being externally triggered.
Do not trigger the device with signals in excess of 300 000 FPM.
The stroboscope has the capability to be triggered by an external signal and
to send the current flash rate as a signal to an external device.
4.3.1 Trigger plug
The stroboscope is supplied with a connector that can be used to connect an
external trigger source or signal receiver.
IN
OUT
GND
Fig. 8 – Trigger plug
The trigger input and output operates with a NPN bipolar transistor.
WARNING:
Do not exceed the voltage or amperage limits.
WARNING:
Ensure safe cable management when using a trigger cable while operating in
the proximity of moving machines.

16 EN
4.3.2 Trigger connection
Fig. 9 – Trigger popup
After the connector is plugged,
the stroboscope needs to know if the
connector is used of input or output.
Please select “input” by pressing
button 1 to trigger the stroboscope
with an external trigger.
4.3.3 Trigger input
Fig. 10 – Trigger
The stroboscope is now using the
external signal from the trigger input
to flash.
After connecting the trigger, press
button 1 “input” in the trigger pop-
up to activate the trigger input. The
trigger input symbol appears in the
top bar to indicate that a trigger
input is in use.
IN
Fig. 11 – Trigger input

17EN
Start
By pressing button 1 “start” the leading edge of the trigger signal is used to
start stroboscope flash. The blue rectangle on the screen indicates that the
leading edge of the signal is used.
End
By pressing button 2 “end” the tailing edge of the trigger signal is used to
start the stroboscope flash. The blue rectangle on the screen indicates that
the tailing edge of the trigger signal is used.
Divider / Multiplier
There is no multiplier in TKRS 31.
When a sensor is used on a geared wheel, or an encoder is used to trigger
the strobe, the number of teeth or impulses has to be set as divider to get
one flash per rotation.
4.3.4 Trigger output
The trigger output allows the stroboscope to send a signal of the current
flash via the trigger port.
After connecting the trigger, press button 2 “output” in the trigger pop-up to
activate the trigger output. The trigger output symbol appears in the top bar
to indicate that the stroboscope is sending an output signal.
OUT
Fig. 12 – Trigger output
The trigger output can be stopped by removing the trigger cable.

18 EN
4.4 Phase mode
The phase mode allows to rotate the frozen image while keeping the same
flash rate.
Changing the phase is very helpful for inspections as all parts of the machine
can be inspected without changing the flash rate.
Rotating the wheel (button 3) changes the phase.
4.4.1 Standard operating mode
Fig. 13 – Phase by TKRS 21
Adjust phase by scrolling the wheel
4.4.2 Quick phase shift
The buttons 1 and 2 can be used to quickly change the phase by + / - 45°.