VEMS EGT (K-thermocouple) amplifier in a DSUB9 connector housing.
www.vems.hu VEMS Webshop ("Genboard / input amplifiers" category)


DSUB9 (Female on sensor with male securing screw) pinout:

  1. : -
  2. : -
  3. : -
  4. : -
  5. : GND (blue wire recommended)
  6. : 0-5V output for dataloggers. 1V/233.3C = 1167C @ 5V
  7. : 1V/100C output (black wire recommended)
  8. : +12v supply (+11 .. 15V supply, ~10mA) red wire recommended
  9. : -


The sensor has a compensational cable with green(+) and white(-) wires. White(-) goes to the input at the corner of the board. The green(+) goes to the other input (=anode of the transient diode, actually same as GND). Yes, this is no mistake. The green(+) wire goes to GND. The white(-) input can go down to -44mV compared to ground.
The DSUB9 connector is naturally male on ECU / DVM / data acquisition (with female screw). Be careful with supply polarity.
pin7: 1V / 100C output is useful to watch EGT on a DVM: for example DVM shows

No calibration is required for pin7: 1V/100C output (which has 1k output impedance) with DVM connected (assuming 1..10MOhm).

Pin6 (1V/233.3C) datalogger output impedance is 43k.
The (1V/233.3C) is specified for a datalogger with high input impedance (10 MOhm or higher). The datalogger might need calibration anyway, especially if datalogger input impedance is lower than 1 MOhm (low input impedance of the connected datalogger makes output voltage lower, in other words need higher temp for same output voltage). Easy to calibrate with a DVM, measuring pin7 and comparing to datalogger results. Approximate values: pin6 output slope in function of connected datalogger's input impedance

www.VEMS.hu