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STI-638 Pulse Rate/ Period Meter in Wall Mounted IP 67 Housing

Discover the STI-638 Tachometers: Advanced Precision for Speed Measurement. Housed in a durable, wall-mounted IP 67 casing, they feature a clear 6-digit LED display. These devices allow for accurate monitoring of rotational or linear speeds and frequency measurement. They can also invert speed values for detailed analysis. Equipped with a 24V DC / 100 mA output for transducers and RS-485 for data transmission, they offer programmable control outputs and a choice of analogue outputs. Easily configured via remote, keyboard, or S-Config software. Optimise your speed monitoring with the STI-638 Tachometers.

STI 638 Pulse Rate Meters Product Parameters

  • Output Signal: Max input frequency 50.0 kHz, ultra bright LED in 3 colours
  • Accuracy: ± 0.02% ± one digit, full temperature range
  • Electrical Connections: Max 29 VA for various power supply options
  • Media Compatibility: IP 67 protection class
  • Special Features: RS-485 Modbus RTU, customisable pulse waiting time, multiple output options

Product Highlights

The STI638 tachometers are housed in a tight, wall-mounted casing (IP 67) with a 6-digit LED display. They are designed to control rotational or linear speed and can also measure frequency. An additional advantage is the ability to convert speed values into inverse values and display the single revolution period or process duration. The device features a 24V DC / 100 mA output for supplying measuring transducers and an RS-485 port for data transmission in production process monitoring systems. The REL/OC control outputs can be programmed based on the instantaneous rotational speed. The counter can be equipped with analogue outputs, including active current output, passive isolated current output, or active voltage output. Configuration can be done without opening the case using the remote controller, local keyboard, or 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

To download the latest datasheet click here: STI 638

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