DIN Rail Filters

Electronic filters in standard DIN rail mount cases

DR Voltage and DRI 4-20mA versions

  • Filter frequencies from 0.1 Hz to >500 kHz
  • Signal frequencies from DC to >500kHz
  • Flexible inputs and gain
  • Adjustable Gain in 1,2,5 steps to x 1000 (+60dB)
  • 4-20mA current output DRI version current source or current sink
  • Isolation (galvanic) between power and signal circuits
  • Range of standard High pass / lowpass / notch filtering
  • 9 Easy to use screw terminal connections
  • 9 -30 V DC power input – ideal for 24V DC
  • Power on indication
  • 2 Buffered voltage outputs
  • Optional +/- 50% output offset
  • 28 mm ( 1.1″) wide DIN rail case
  • Fits 35mm and 15mm DIN rails
  • 255 step variable filter frequency (1600 series) fixed filter frequency (1200 series)
  • Fast delivery

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DIN Rail Filters DR1200 and DR1600

1200 series fixed frequency
1600 series variable frequency
DR version – voltage output
DRI version 4-20mA output and voltage output.


The Kemo DIN rail filter units combine Kemo’s extensive knowledge of signal filtering with a DIN rail case, screw connections, and a 24 V DC supply. With the combination of gain, easy installation, and a wide range of filter responses the Kemo DIN Rail filters are an easy solution to many industrial signal problems. Filters are available to cover a wide range of applications, general purpose noise reduction, anti-Aliasing, signal reconstruction, and notch filters to reduce unwanted frequencies, as well as traditional Butterworth and Bessel filters. Gain is set by easy access on board jumpers, with gain trim. Input configurations are set by internal jumpers, the case opens without tools. Signal and power connections are made by industry standard screw terminals. See our Applications section for a real problem solved using Kemo filters similar to the DIN Rail filters. DIN Rail filters are available in two versions, DR for voltage outputs, and DRI with voltage outputs and 4-20mA output. Kemo have many years expertise in the field of small noisy signals, contact us if you have any questions, or require further information. For higher channel counts, >8 channels, all in one location, we suggest you take a look at the CardMaster 21.2 page.

Full Specification
Channels  1 per unit
 Control  Manual – jumpers and DIP switches
DR and DRI1200 – Fixed frequency.
DR and DRI1600 – 255 steps set by DIP switch
 Connectors  DR version 9 Screw terminals (3 x blocks of 3)
DRI version 12 Screw terminals (4 x blocks of 3)
 Frequency  1200 series  0.1 Hz – >500 kHz
1600 series  255 steps x ‘Base’ frequencies of   1,2,5,10,20,50,100,200,500 Hz
 Gain  x1,x2,x5,x10,x20,x50,x100,x200,x500,x1000 set by jumpers
 Filters  1200 series – 1200 series filter modules
1600 series – 1600 series filter modules
 Filter Responses Standard Responses The Kemo range of stock filter responses
Response 01   Anti-Aliasing, sharp >135 dB/Oct, flat to cut off, high and lowpass
Response 03,  48 dB/Oct Butterworth, high and lowpass
Response 05,  24 dB/Oct Butterworth, high and lowpass
Response 07,  48 dB/Oct Bessel, high and lowpass
Response 09,  24 dB/Oct Bessel, high and lowpass
Response 41,  General Purpose, flat, linear phase, 52 dB/Oct, high and lowpass
Response NQ10  Sharp Notch
 Input Coupling  AC / DC ( Matched AC Coupling on Differential Input)
 AC coupling  -3dB at 1.5 Hz
 Input Mode  Single Ended / Differential
 Voltage Input Impedance  1MΩ
 Current Input Impedance  500 Ω (4-20mA input)
 IEPE  4mA 24V current source (can be set to higher current on request)
 Signal Level  +/- 10 V pk-pk. (Usually with ‘headroom’)
  Offset    Multi-turn trim,
Optional +/- 50% adjustment (specify ‘O’ at Order)
  Outputs   DR version 2 Voltage
DRI version 2 voltage and 4-20mA ‘source’ or ‘sink’
 4-20mA Bandwidth   10 kHz
 Output Impedance  47 Ω
 Power Indicator  LED power on indicator blue
 Size  27 x 83 x 114 mm (1.1 x 3.3 x 4.5″)
mounts on standard 35 and 15 mm DIN rails
 Power  9 – 30 V DC 2 watt typical (ideal for +24 V DC)

Inputs and Gain

Both versions of DIN Rail filters have the same flexible configurable input stage. Set by marked on board jumpers.

Single Ended / Differential – The units are fundamentally differential input. Single ended input is easily set by either an internal jumper or an external link to zero volts on the input screw terminals.
Note all the connector blocks have a zero volt terminal. To make connections easy.

AC / DC Coupling – is set by internal jumpers. The AC Coupling is matched to both legs of the differential inputs.

IEPE – a 4mA current source is provided for use with IEPE transducers, this is set by an internal jumper. Higher currents can be set up to 10mA.

4-20 mA Input – this input is a 500 Ω resistor across the differential inputs, the incoming 4-20mA signal is converted to a 2-10V voltage signal. This input can be set to differential input to give a semi-floating input, or set to single ended to tie the input to signal zero volts.

Gain – the DIN Rail filter has 2 stages of gain before the signal filter. x1,x2,x5 and x1,x10,x100.
This gives a full 1,2,5 set of gains from 1 to x1000 (+60dB)


The standard range of Kemo lowpass and highpass filter responses can be fitted to the DIN Rail filters. A sharp notch filter, response NQ10, is available for 50Hz or 60Hz applications.
1200 series DIN rail units are fixed frequency.
1600 series DIN rail units have variable frequency filter modules, 255 filter steps set by an easy to use DIP switch.

Voltage Outputs

Both versions of DIN Rail rail filters have 2 identical buffered voltage outputs.

DRI version with 4-20mA Outputs

The DRI version adds a flexible configurable 4-20mA output. The filtered voltage is reconverted to a 4-20mA current signal. The output current can be configured EITHER as a current source using the isolated on board +24V power supply, OR as a current sink, where an external +24 supply can be used.
All set by marked jumpers.
Order as DRI version.

Optional Output Offset

Optional output offset after the filter, before the output buffers, adjustable by multi-turn pot over a +/- 50% of output full scale.
Order as option ‘O’.

DC Power

The 9-30V DC power input in this unit uses DC-DC conversion methods, please check our page about DC Power.

System Diagrams

Block diagrams of the DR, voltage, and DRI, 4-20mA, versions of the Din Rail filters.


DR Version – 2 Voltage Outputs

Ordering Information

Specify version DR voltage version OR DRI with additional 4-20mA current output
Specify 1200 series fixed frequency OR 1600 series variable frequency
Specify cut off frequency 1200 Series
Specify frequency range 1600 Series (‘base frequency’ to 255 x ‘base frequency’)
Specify filter type, highpass, lowpass or notch.
Add ‘O’ for +/- 50% Optional output offset.
If you need any help please contact us.

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