The SFT 881 is a low-cost industrial K Factor PreAmp with Rate Alarm. The SFT 881 accepts and amplifies turbine pulses. They are then divided by ‘K’ to create output pulses representing standard units of volume (i.e. 1/10 of a barrel or one cubic meter). This changes the frequency of the high-speed pulses originating at the turbine into a lower frequency signal suitable for input into low speed input devices (RTU’s and PLC’s).


  • Turbine PreAmp – drives signal cable up to 1500 feet
  • Can operate as a high or low rate alarm
  • Stores a ‘K’ Factor between 1 and 9,999,999 (7 digits)
  • Easy to enter ‘K’ Factor, no lengthy calculations or hexadecimal / Octal numbers to play with
  • Stores 5 pulse widths (0.15ms, 25ms, 100ms, 500ms, 1s)
  • Stores two output pulse states
  • View or change the ‘K’ Factor, pulse width and output pulse state
  • Displays all parameters
  • Rugged LED display
  • ‘K’ value is stored in EEPROM and retained even with loss of power
  • Eliminates cost of barriers if installation is completed to Class 1 specifications
  • CSA rating Class 1, Div. 1, Groups B, C, & D
  • Accepts and amplifies raw turbine sizes 3/8 inch and up
  • Wide temperature range: -40°C to 70°C
  • On-card microprocessor enables smart operation
  • Built-in watchdog timer and extensive transient protection assures reliable operation
  • Input sensitivity can easily be set from 20mV to 1V