SD / SA / SR 340-644

Advanced Measurement of RPM, Speeds, Baking and Processing Times, Speed Ratios, Sum or Differential Speeds


SD 340-644: Speed Ratio Meter (RS232 interface)
SA 340-644: Speed Ratio Meter (RS232 interface, analog output)
SR 340-644: Speed Ratio Meter (RS232 and RS485 interface)

  • Measuring functions: tachometer, ratemeter, and frequency counter with two independent encoder inputs for use with incremental encoders, proximity switches, photocells
  • Both impulse inputs with individual scaling, each adjustable to 1, 2 or 4 tracks (A, /A, B, /B), suitable for frequencies from 0,01 Hz up to 1 MHz
  • Programmable operating modes for rpm, speed, processing time (reciprocal speed), sum speed or differential speed, speed ratio and percentaged speed difference
  • 4 preselections with fast-switching outputs and programmable
    maintain / latch / start-up delay functions
  • Adjustable filtering functions, programmable linearization and more
  • Power supply 24 VDC or 24 VAC, dimensions 96 x 48 mm (3.780" x 1.890")

Dual Frequency Counters with Relay Outputs and optional Thumbwheel Switches


SD 640-644 : Speed Ratio Meter (RS232 interface)
SA 640-644 : Speed Ratio Meter (RS232 and analog output)
SR 640-644 : Speed Ratio Meter (RS232 and RS485 interface)

  • The frequency meters shown here provide exactly the same technical properties and functions as series SD/SA/SR 340 shown above
  • Moreover, these models are additionally equipped with 4 output relays
     (one dry changeover contact each)
  • According to need, these models are also available with up to four front thumbwheel switch sets (preselection switches)
  • Front dimensions 96 x 96 mm (3.78" x 3.78")
  • All available models and possible combinations are clearly described in the
    PDF operating instructions

Table of Available Models

Motrona Options 2