Product Introduction

4-Series THT-50 Sensor
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Product Description

The sensor is designed for the measurement of THT concentration in gas phase. It can be used as the pin to pin replacement of the standard 4 series electrochemical THT sensor.

Performance Characteristics
Nominal Range 0~50 mg/m3
Maximum Overload 100 mg/m3
Sensitivity(20℃) 0.15 ± 0.05 μA/mg/m3
Response Time (T90) ≤ 60 s
Zero Signal(20℃) < ±0.4 μA
Resolution 0.3 mg/m3
Linearity Linear up to 50 mg/m3
Bias Voltage +300 mV


Product Dimensions

Temperature Range -20℃ ~ 50℃
Pressure Range 1 atm ± 10%
Humidity Range 15% ~ 95% 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 12 months
Intrinsic safety Data
Maximum Current at 100 mg/m3 THT < 0.2mA
Maximum O/C Voltage 1.3V
Maximum S/C Current < 1.0A
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 (mg/m3 THT equivalent)
Hydrogen Sulfide 25 8.5
Carbon Monoxide 50 0.1
Nitric Oxide 35 <130
Sulfur Dioxide 5 0
Nitrogen Dioxide 10 16

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.


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.