Product Description:

MP135 10 - 500PPM Metal Oxide Semiconductor (MOS) Gas Sensor Is Used For H2 Alcohol And CO Detection

Features:

MP135 10 - 500 ppm Metal Oxide Semiconductor (MOS) gas sensor is used for detecting H2, alcohol and CO.

Parameters Symbol / Unit Typical Value / Range Remarks

Detected Gas — H2, alcohol, CO Also responds to VOCs, a non-selective device

Detection Range ppm H2: 10 - 500;

alcohol: 5 - 500; CO: 10 - 500 Part of the information can also be found in the description of 10 - 1000 ppm, with 500 ppm as the typical upper limit

Loop Voltage Vc ≤ 24 V DC Standard test Vc = 5.0 ± 0.1 V

Heating Voltage Vh 5.0 ± 0.1 V AC/DC Standard test Vh = 5.0 ± 0.1 V

Load Resistance Rl Adjustable By voltage division, the change of Rs is converted into voltage output

Heating Resistance Rh 95 ± 10 Ω (room temperature) Different batches / data are approximately 85 - 130 Ω, measured values are taken as the standard

Heating Power Consumption Ph ≤ 300 mW Other data also describe ≤ 240 mW

Sensitive Body Resistance Rs 10 kΩ - 100 kΩ (50 ppm H2) Changes with gas type / concentration

Sensitivity S ≥ 3 (50 ppm H2) S = Rs (air) / Rs (50 ppm H2)

Concentration Slope α ≤ 0.6 (H2) α = R (100 ppm) / R (30 ppm)

Standard Test Conditions — T = 20 ± 2 ℃; RH = 65 ± 5%; Vc = 5.0 ± 0.1 V; Vh = 5.0 ± 0.1 V Data is based on these conditions

Preheating Time — ≥ 48 hours New pieces / after long storage, sufficient preheating is required to stabilize performance

Package / Pin — Metal package, DIP-4 1/2 pin for heating; 3/4 pin for measurement

Working Principle — Metal Oxide Semiconductor (MOS) Resistance increases with the concentration of the target gas

Selection and Usage Tips

Detection Range and Sensitivity: With 500 ppm as the typical upper limit; for H2, the sensitivity S ≥ 3 at 50 ppm is the benchmark, actual assessment requires considering the type and concentration of the gas.

Power Supply and Heating: Loop Voltage ≤ 24 V DC; Heating Vh = 5.0 ± 0.1 V (AC/DC); Heating Resistance Rh ≈ 95 ± 10 Ω, Power Consumption ≤ 300 mW (different data have ≤ 240 mW), please refer to the actual measurement / batch specifications.

Load Resistance Rl: Adjustable, used to convert Rs changes into voltage output; Rl selection will affect sensitivity and linearity, calibration should be performed in the target gas.

Environment and Stability: Standard test conditions are 20 ± 2 ℃, 65 ± 5% RH; for long-term storage, it is recommended to store at -20 to +60 ℃, dry and sealed; avoid exposure to high-concentration gases, silicon vapor and water condensation before powering on.

Preheating and Aging: New pieces or after long storage, preheating ≥ 48 hours; the aging time should be extended accordingly for longer storage periods.

Non-selectivity and Cross-Sensitivity: Responds to H2, alcohol, CO and some VOCs; calibration in the target gas and assessment of interference based on the application scenario are required.

Data Variations Explanation

Detection Range: Some data provide 10 - 1000 ppm, the mainstream specification is 10 - 500 ppm, actual selection should refer to the current specification sheet of the manufacturer.

Heating Parameters: Rh is commonly 85 - 130 Ω, 95 ± 10 Ω is more common; Ph has two expressions ≤ 300 mW and ≤ 240 mW, they are normal batch differences.

Specifications: