STI-638 Tachometer

Brand: SIMEX sp. z o.o.

STI-638 Tachometer

Brand: SIMEX sp. z o.o.
The STI-638 tachometers encased in a tight, wall-mounted housing - IP 67 with 6-digit, large LED display are designed to control rotational or linear speed of moving objects.

The device is also able to measure frequency.

As an additional advantage the device can convert the rotational / linear speed into inverse values, and to display the single revolution period or process duration.

The 24V DC / 100 mA output is designed to supply measuring transducers, and the RS-485 port enables data transmission in production process monitoring systems.

The REL / OC control outputs can be programmed depending on the instantaneous value of rotational speed.

Additionally the counter may be equipped with analogue outputs, according to the customer selection: active current output, passive isolated current output or active voltage output.

The counter may be configured with no need to open the case, by using the remote controller, the local keyboard or with free S-Config software via the RS-485 communication port.
  • Pulse Rate / Period Meter in Wall Mounted IP 67 Housing
  • Rotational / Linear Speed Control
  • Revolution / Movement Period Control
  • Binary Outputs REL / OC
  • Analogue Output: Active or Passive, Power Supply Output: 24V DC
  • RS-485 / Modbus RTU
  • "Over" Signalling when the Measuring Range is Exceeded
  • Ultra Bright Red, Green and Blue Display
  • Free Configuration Software S-Config


Number of Inputs

  • 1

Input Type

  • Pulse

Input Levels

  • Low: 0...1V, High: 10...30 V

Input Frequency

  • 1.5...50 kHz

Output Type

  • Relay I=1A, U=30 Vdc/250 Vac (cosø=1)
  • Open Collector: I=30 mA, U=30 Vdc, P=100 mW
  • 0/4...20 mA: active current, operating range 0...24 mA Max., load resistance 700 Ω Max., resolution 13 bit
  • 4...20 mA: passive current, isolated, operating range 2,8...24 mA Max., load resistance 600 Ω @ 24 Vdc, resolution 13 bit
  • 0/1...5 V, 0/2...10 V: active voltage, operating range 0...11 V Max., load resistance min. 2000 Ω, resolution 13 bit
  • Depends on Configuration

Measurement Unit

  • Revolutions per Second, per Minute, per Hour

Measurement Method

  • Electrical
  • Pulse

Power Supply

  • 16...35 Vac, 19...50 Vdc
  • 85..260 Vac/dc


  • LED
  • 6 x 38 mm
  • Ultra Bright: Red, Green, Blue

Communication Interface

  • RS-485 / Modbus RTU

Transmission Parameters

  • 1200...115200 bit/s
  • 8N1 / 8N2

Operating Temperature

  • 0...+50° C
  • -20…+50° C

Protection Class

  • IP 67

Case Material

  • ABS
  • Polycarbonate


  • Wall

Case Dimensions

  • 230 x 140 x 96.5 mm
show more