PRODUCT INFORMATION

Maxell Lead-Free Oxygen Sensors KE-LF Series
Features:Applications:* 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 - 3~10 years in ambient air* Safety - Oxygen detectors* Environmental controls - Combustion gas
monitoring* Food industry - Refrigeration, greenhouses* Educational material - Oxygen test kits
* Medical - Artificial ventilator

The Maxell Oxygen Sensor KE-LF Series are unique galvanic
cell-type oxygen sensors developed by Maxell, Ltd. in Japan. Their
most notable features are lead-free, long life expectancy, excellent
chemical durability, and no influence by CO2. KE-LF Series oxygen
sensors are ideal to meet the ever-increasing demand for oxygen
monitoring in various fields such as combustion gas monitoring,
the biochemical field, domestic combustion appliances, etc.

Sensitivity Characteristics:

Response time:(typical)(typical values)
35120120

30100
100

OutputRatio
Ratio(%)(%)
OutputOutput Voltage (mV)

25201510
KE-12F3LF
KE-25LF/KE-25F3LF
KE-50LF
KE-25F3LFM

500204060

Oxygen Concentration (%)

8080806060

40
KE-12F3LF
KE-50LF
KE-25LF/KE-25F3LF
KE-25F3LFM
KE-50LF
KE-25LF/KE-25F3LF
KE-25F3LFM

20100

0000

1010202030
403040Time (sec.)(sec.)
Time

50506060

PRODUCT INFORMATION
Dimensions:KE-25LF / KE-50LF
KE-25LF standard version(standard version)

KE-12F3LF / KE-25F3LF / KE-25F3LFM
KE-25F3LF (threaded top)
(threaded top)

ø28±0.5

ø23±0.522.5±0.3

22.7±0.580±550±0.5

Lead wire

M16 x P1.085

47.3±0.5

1.54±2

ø23.2±0.5

13ø23.2±0.5

ø5ø9ø9Unit = mm

15Specifications:
Model
Item

KE-12F3LF

Measurement range
Accuracy (Note 1)
Operatingconditions

KE-25LF
KE-25F3LF

KE-50LF

0~30% O2
±1% full scale

0~100% O2±1% full scale±2% full scale

Atmosphericpressure

811hPa~1216hPa

Temperature

5~40˚C

Relative humidity

KE-25F3LFM±1% full scale

10~90%RH (no condensation)

Response time (90%) (Note 2)

approx 8 sec.

approx 15 sec.

approx 60 sec.

approx 15 sec.

Initial output voltage
under factory std test conditions

9.0~15.0mV

10.0~15.5mV

4.5~7.5mV

5.0~8.0mVLife expectancy
at 20˚C in normal air (Note 3)

approx 3 yrs

approx 5 yrs

approx 10 yrs

approx 6 yrs

Factory testconditions

Test gas

21% O2

Atmosphericpressure1013hPa

Temperature

25˚C* Please refer to the Limited Warranty and Limitation of Liability in Technical Information for Maxell
Oxygen Sensor KE-LF Series.
* KE-LF series oxygen sensors are designed, manufactured and tested for industrial application
only. These products are not designed, manufactured, tested, or intended specifically for use in orincorporation into artificial respirators, ventilators, and/or other equipment for medical application, orsubassembly modules or parts thereof.

REV: 10/23

Notes:1) When calibrated at both 0% and 30% of O2,
accuracy in the range from 0-30% O2 shall bewithin ±1% of full scale for both KE-12F3LF andKE-25LF/KE-25F3LF, and ±2% of full scale for
KE-50LF. When calibrated at both 0% and 100%of O2, accuracy in the range from 0-100% O2
shall be within ±1% of full scale for KE-25F3LFM.
2) Sensors should be used under conditions
where the air exchange is greater than200~300ml per minute in order to obtain theresponse speed as shown in the Specifications.
3) 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.

Manufacturer: Maxell, Ltd.
Distributor: FIGARO ENGINEERING INC.
1-5-11 Senba-nishi
Mino, Osaka 562-8505 JAPAN
Tel: 81-72-728-2045
URL：www.figaro.co.jp/en/