DIN Rail Pre-Amplifier

The PA7 and PA8 Series preamplifiers provide the functionality of our standard preamplifiers in a convenient DIN Rail enclosure for easy mounting and installation. Versions are offered for both Variable Reluctance (Mag) as well as RF sensor input. Models include the most popular pulse output options.

Installation Drawing

Input Power

  • Voltage: 8 to 30 VDC
  • Current draw: 50mA MAX.
  • Reverse polarity protected

RF Sensor Input

  • Modulation carrier frequency: 25 KHz
  • Input frequency: 2 Hz to 5 KHz
  • Preferred coil inductance: 1.0 mH +/- 10%
  • Max. distance from sensor to amplifier: 100'

VR Sensor Input

  • Input protected, RF and band pass filtered
  • Input frequency: 2 Hz to 10 KHz, user-adjustable trigger level to eliminate false pulsing
  • Input impedance: 40K ohms (nominal)
  • Max. input signal: 60.0 V RMS
  • Max. distance from sensor to amplifier: 100'

Pulse Output Options

  • Open Collector
  • TTL/CMOS (0-5 VDC square wave)
  • 0 to 10 VDC square wave
  • Supply Tracking; Logic 0 <= 0.4 VDC; Logic 1 >= V Supply - 0.2 VDC
  • For additional output options contact us.

Temperature Range

  • Operating: -40°F to +185°F
    (-40°C to +85°C)
  • Units that operate to 105°C are also available.

Electrical Connections

  • Screw terminals suitable for 24 to 12 AWG wire


  • NS 35/7.5 and NS 35/15 DIN-Rail

Suitable Sensors


  • CE compliant to EMC Directive 2004/108/EC for use in residential, commercial, light industrial and heavy industrial environments


  • Unconditional one (1) year warranty if used within specifications
ATEX & IECEx Certified: Custom & Standard Speed Sensors for Intrinsically Safe applications (also approved by CSA w/NRTL/C)