KE-LF Series/World leader in gas sensing innovation


Lead-free galvanic cell-type sensor

  • no external power supply required for sensor operation
  • no warmup time required
  • meets RoHS2 directive

Weak acid electrolyte

  • virtually no influence from CO2, H2S, SO2
  • long life - 5 years in ambient air


  • Safety - Oxygen detectors
  • Environmental controls - Combustion gas monitoring
  • Food industry - Refrigeration, greenhouses
  • Educational material - Oxygen test kits

Figaro Engineering Inc. is pleased to announce the latest product offering--the lead-free galvanic cell-type oxygen sensor KE-LF series.
In addition to KE-series oxygen sensors, we have prepared new models of the lead-free KE-LF series oxygen sensor, the KE-25LF and KE-25F3LF. As with the KE-series, the KE-LF series are unique galvanic cell-type oxygen sensors developed by Maxell, Ltd. with long life expectancy, excellent chemical durability, and no influence from CO2.


Model.No KE-25 / KE25-F3
(with lead)
KE-25LF / KE25-F3LF
Measurement range 0~100% O2 0~30% O2
Initial output voltage 10~15.5mv
Response time (90%) approx. 15 sec.
Operating conditions 5~40˚C/811~1215hpa
Life expectancy at 20˚C in normal air approx. 5 years*

* Life expectancy at 20˚C in normal air (1013hPa /21%O2) is defined as the period until sensor output drops to 70% of its original value

Although label design and color are changed, the dimensions of the new sensors are identical to current KE-series oxygen sensors, ensuring easy on-site replacement of the current KE-series oxygen sensors.

For more information on Maxell Lead-free oxygen sensors KE-LF series: