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Product Introduction

4LEL-3.0 Sensor
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Product Description

This sensor is designed specifically for the measurement of methane concentration in gas phase. It can be used as the pin-to-pin replacement of the standard 4-series LEL sensor.

Performance Characteristics
Nominal Range 0 ~ 100% LEL
Maximum Overload 100% LEL
Sensitivity (20℃) 22 ± 7 mV/%CH4
Response Time (T90) < 30 s
Resolution < 1% LEL
Linearity %FSS ± 5%
Recommended Voltage 3.00 ± 0.02 VDC
Operating Current 95 ± 15 mA
Humidity Drift < 1% LEL @ 90%RH (25℃)
Temperature Drift < 3% LEL (-20℃ ~ 50℃)
Baseline (mV) < ±20 mV


Product Dimensions

Temperature Range -30℃ ~ 50℃
Pressure Range 1 ± 0.2 atm
Humidity Range 0% ~ 90%RH non-condensing
Life Time
Long Term Baseline Drift < 3% LEL/month
Long Term Sensitivity Drift < 3.5% output signal/month
20% Sensitivity Drift  @ 1000 ppm H2S for 2.5h
40% Sensitivity Drift  @ 1000 ppm HMDS for 2.5h
Recommended Storage Temp -20℃ ~ 40℃
Expected Operating Life > 2 years in clean air
Warranty 12 months
Physical Characteristics
Housing Material 316L stainless steel
Weight (Nominal) 24 g
Orientation None

Inappropriate use of the pins in product design will affect the sensor functionality. If the sensor is used in extreme environmental conditions, please contact us for more details.

Temperature Data

Safety Note

This sensor is designed to be used in certain instruments for life critical applications. To ensure the sensor functions per its specifications inside the instrument, it is required to read the instrument user's guide carefully and comply with the calibration procedures by using certified target calibration gas before each use. Failure to do so may cause serious injury and fatality. Please do not open the sensor plastic enclosure because the electrolyte and other chemicals stored inside are harmful.

It is highly recommended for customers to validate the sensor performance using this document as a reference for their product designs or applications.