Serviceline Industrial Sensors
Serviceline Explosion Protection

Rotation Speed Monitor KFU8-DW-1.D

  • Speed monitoring up to 40 kHz
  • 1 pre-select value with relay output and LED indicator
  • 2-, 3-, 4-wire and NAMUR sensors as well as rotary encoder connectable
  • Start-up delay
  • Menu driven operation via 4 front keys
  • Period measurement
  • Output signal can be inverted
  • Display devices can be set between 0.1 ... 2.5 sec.

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  KFU8-DW-1.D

Product Description
Rotation Speed Monitor
General specifications
Signal typeDigital Input
Functional safety related parameters
MTTFd100 a
Rated voltage200 ... 230 V AC ; 100 … 130 V AC; 50/60 Hz
20 VDC ... 30 VDC
Fusingexternal fusing 4 A
Power consumptionAC: < 5 VA
DC: < 5 W
Connection sidefield side
Input 1
Connectionterminals 8-, 9+
Connectable sensor typesNAMUR sensors according to DIN EN 60947-5-6
Open loop voltage8.2 V DC
Short-circuit current6.5 mA
Switching point1.2 ... 2.1 mA Switching hysteresis approx. 0.2 mA
Input frequency0.002 ... 10000 Hz, pulse length/duration: ≥ 20µs
Impedance1.2 kΩ
Input 2
Switching pointhigh: 16 ... 30 V DC; max.10 mA due to integrated constant current sink; Ri ≅ 3 kΩ
low: 0 ... 6 V DC
Input frequency0.002 ... 40000 Hz, pulse length/duration: ≥ 12µs
Connectionterminals 7+, 13- sensor supply
terminals 14, 15 NPN/PNP input (galvanically isolated)
Connectable sensor typesTwo, three, or four-wire proximity switch, incremental rotary encoder, or externally generated pulses 16 ... 30 V
Sensor supply19 ... 28 V DC non-stabilised; ≤ 30 mA short-circuit protected
Input 3
Start-up overrideTriggering by external signal 16 ... 30 V or Place jumper between terminals 2/3 or by switching on supply voltage (terminal 2 and terminal 3 permanently bridged)
Jumpering time0.1 ... 999.9 s (External trigger signal)
Connection sidecontrol side
Relay1 changeover contact
Sensor supply24 V DC ± 10 %, 30 mA , short-circuit protected
Contact loading250 V AC/2 A/ cos φ ≥ 0.7
40 V DC/2 A
Delay≤ 20 ms (incl. calculation time)
Mechanical life≥ 30.000.000 switching cycles
Transfer characteristics
Changing interval5 ms (Internal processing time)
Time delay before availability≤ 400 ms
Measuring error0 ... 40000 Hz: ≤ ±0,10%
Display: ±1 digit
Timer functionON-delay, OFF-delay, one shot, pulse extension
Time0 ... 999.9 s ; mode of operation reversible
Display elementsdisplay , 4-digit, 7-segment red display, 7 mm digit height and LED
LED indicationyellow LED : switching state
Display indication0.002 ... 9999 Hz or
0,01 ... 9999 min-1
Control elementsControl panel
Configurationvia operating buttons
Labelingspace for labeling at the front
Standard conformity
Electromagnetic compatibilityacc. to EN 50081-2 / EN 50082-2
Ambient conditions
Ambient temperature-25 ... 40 °C (-13 ... 104 °F)
Storage temperature-40 ... 85 °C (-40 ... 185 °F)
Relative humiditymax. 80 %, not condensing
Altitude0 ... 2000 m
Operating conditionsThe device has only to be used in an indoor area.
Mechanical specifications
Connection assemblyCaution: Please be aware that the device may only be connected to a switchable power supply. The switch or circuit breaker must be easy to reach and identified as the separator for the device.
Degree of protectionIP20
Connectioncoded, removable terminals , max. core cross section 0.34 ... 2.5 mm2
Construction typemodular terminal housing in Makrolon, System KF
For use in the switch cabinet/switch cabinet module
Mountingsnap-on to 35 mm standard rail or screw fixing
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see

Documents: KFU8-DW-1.D

ManualsLanguageFile TypeFile Size
ManualENGPDF3430 KB
Manual KFU8-DW-1.DENGPDF1046 KB
HandbuchGERPDF3544 KB
Handbuch KFU8-DW-1.DGERPDF1080 KB

Approvals+Certificates: KFU8-DW-1.D

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-1838BPDF162 KB
Canada, USA CSA cUL2137693PDF76 KB