Product Introduction

7E4-H2S-10 sensor
Datasheet download
Product Description

This 4-electrode sensor is designed for air quality monitoring to measure the low-concentration H2S gas with ultra-high resolutions. The design optimizes the sensor sensitivity, accuracy and long-term stability and enables the sensor to detect H2S variations at parts per billion (ppb) levels.

Performance Characteristics
Nominal Range 0 ~ 10 ppm
Maximum Overload 30 ppm
Sensitivity (20℃) 1.5 ± 0.5 μA/ppm
Response Time (T90) ≤ 90 s
Zero Signal (20℃) < ±300 nA
Baseline Shift (-30℃ ~ 50℃) < 100 ppb
Resolution 2 ppb
Linearity Linear up to 10 ppm
Bias Voltage 0 mV


Product Dimensions

Temperature Range -30℃ ~ 50℃
Pressure Range 1 ± 0.1 atm
Humidity Range 15% ~ 90%RH non-condensing
Life Time
Long Time Output Drift < 2% signal/month
Recommended Storage Temp 10℃ ~ 30℃
Expected Operating Life 2 years in clean air
Storage Life 6 months in original packaging
Warranty 24 months
Intrinsic Safety Data
Max. Current at 30ppm H2S < 0.2 mA
Max. O/C Voltage 1.3 V
Max. S/C Current < 1.0 A
Physical Characteristics
Housing Material ABS
Weight (Nominal) 8 g
Orientation None

Output signals from the sensor pins are different. Inappropriate use of the pins in product design will affect the sensor functionality. Exposure to high concentrations of solvent vapors should be avoided under any condition. Mechanical overstress may cause deformation or cracks of the plastic enclosure of the sensor. If the sensor is used in extreme environmental conditions, please contact us for more details.

Cross-Sensitivity Data
Gas Concentration (ppm) Output Signal (ppm H2S equivalent)
Nitrogen Dioxide 5 -1.5
Chlorine 5 -0.5
Nitric Oxide 5 -0.2
Sulfur Dioxide 5 < 0.1
Carbon Monoxide 5 < 0.1
Hydrogen 100 < 0.1
Ethylene 100 < 0.1
Ammonia 20 < 0.1
Carbon Dioxide 30,000 -0.3

Note: The cross sensitivities include but not limited to the above gases. It may also respond to other gases. The data in the table above may vary from different batches of sensors and the changes of test environment. Calibration using the gases that have the cross sensitivities to this sensor is not recommended.

Temperature Data

Safety Note

The 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.