Product Introduction

4-Series H2S-100 Sensor
Datasheet download
Product Description

This sensor is designed for single gas monitors measuring Hydrogen Sulfide concentration in the gas phase. lt can be used as a pin-to-pin replacement for the standard 4-series electrochemical Hydrogen Sulfide sensors made by other manufacturers.

Performance Characteristics
Nominal Range 0~100 ppm
Maximum Overload 500 ppm
Sensitivity(20℃) 0.80 ± 0.20 μA/ppm
Response Time (T90) ≤ 30 s
Zero Signal(20℃) < ±0.4 μA
Baseline Shift (- 40℃ ~ 50℃) < 0.2 ppm
Resolution 0.1 ppm
Linearity Linear up to 100ppm
Bias Voltage 0 mV


Product Dimensions

Temperature Range -40℃ ~ 50℃
Pressure Range 1 ±0.1atm
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
Maximum Current at 500ppm H2S < 0.2mA
Maximum O/C Voltage 1.3V
Maximum S/C Current < 1.0A
physical characteristics
Housing Material ABS
Weight (Nominal) 5g
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 SemeaTech for more details.

Cross-sensitivity Data
Gas Concentration (ppm) Output signal (ppm H2S equivalent)
Carbon Monoxide 100 4.5
Sulfur Dioxide 20 4.0
Nitrogen Dioxide 10 -2.5
Nitric Oxide 50 0.0
Ammonia 50 0.0
Hydrogen 1000 4.0
Ethylene 100 0.2
Chlorine 15 -3.0
Ethanol 200 0.1

Note: The cross sensitivity are including 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 with cross sensitivity gas 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 functioning 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 housing because the electrolyte stored inside is harmful.

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