Sensor Specifications
The 4-Series electrochemical sensor by Ningxia MaiYa Sensor Technology Development Co., LTD features a repeatability of 1% output signal and a linearity with a regression coefficient of R2=0.999. It operates within a temperature range of -40℃ to +50℃ and a humidity range of 15% to 90% RH, non-condensing. The sensor can withstand atmospheric pressure variations of ±10% and has a pressure factor of less than 0.02% signal per MBar. The baseline extent is less than ±0.4µA, with a long-term drift of less than 5% signal loss per year. It requires no bias voltage and has a load resistance of 10Ω. The sensor does not include built-in filters, has a lifetime of 2 years in air, and comes with a 1-year warranty from the date of shipment. The output current polarity is positive for carbon monoxide and hydrogen sulfide sensors.

Product Models and Performance
The document lists various models of the 4H2S sensor, each with different normal and maximum ranges, sensitivity, resolution, response time, and maximum zero drift. For example, the 4H2S-10 model has a normal range of 0-10 ppm, a maximum range of 20 ppm, a sensitivity of 2.0±0.40 µA/ppm, a resolution of 0.005 ppm, a response time of less than 30 seconds, and a maximum zero drift of 0.1 ppm.

Cross Interference
The sensor's cross-interference data is provided for reference only, indicating that the measurement of intersecting gases is not linear and accuracy is not guaranteed. For instance, gases like CO, H2, NH3, NO, C2H5OH, CH3OH, CH4, and C2H4 show no sensor response at specified concentrations.

Usage and Handling Recommendations
The sensors are designed for gas leak monitoring and alarms, not for long-term exposure or continuous detection. Sensor pins should be connected through a PCB socket to avoid damage. Contact with organic solvents, alcohol, paint, oil, and high concentrations of gas should be avoided. Sensors with positive output current require oxygen for reactions and should be calibrated with air as the background gas. Sensors should not be removed or inserted while powered on to prevent damage.