YJJ MP801 0.5-1000PPM Metal Oxide Semiconductor (MOS) Air Quality Sensor

Product Description:

YJJ MP801 0.5 - 1000PPM Metal Oxide Semiconductor (MOS) Air Quality Sensor

Features:

MP801 is a metal oxide semiconductor (MOS) air quality sensor, sensitive to benzene, toluene, formaldehyde, alcohol and smoke. Its typical detection range is 0.5 - 1000 ppm (measured by alcohol), and the standard test conditions are 20 ± 2 ℃, 65 ± 5% RH, with a preheating time of ≥ 48 hours.

Parameters Symbol / Unit Typical Value / Range Remarks

Detected Gas — Benzoic acid, Toluene, Formaldehyde, Alcohol, Smoke Non-selective, sensitive to multiple VOCs and smoke

Detection Range ppm 0.5 - 1000 (Alcohol) Data is based on alcohol as the reference, other gases need calibration

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

Heating Voltage Vh 5.0 ± 0.1 V AC/DC Requires stable power supply to ensure consistency

Load Resistance Rl Adjustable By voltage division to convert resistance change into voltage output

Heating Resistance Rh 95 ± 10 Ω (room temperature) From actual measurement, it varies between approximately 85 - 130 Ω for different batches, refer to actual measurement / batch specifications

Heating Power Consumption Ph ≤ 300 mW Other data also show ≤ 240 mW, it is a batch difference

Sensitive Body Resistance Rs 1 kΩ - 15 kΩ (10 ppm Alcohol) Changes with gas type / concentration

Sensitivity S ≥ 2 (10 ppm Alcohol) S = Rs (air) / Rs (10 ppm Alcohol)

Concentration Slope α ≤ 0.6 (Alcohol) α = R (50 ppm) / R (10 ppm), reflects linearity

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 parts / after long storage require sufficient preheating

Package / Pin — Metal, 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: 0.5 - 1000 ppm based on alcohol as the reference； S ≥ 2 at 10 ppm alcohol is the benchmark, actual calibration is required based on the target gas and concentration range.

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 (data shows ≤ 240 mW), refer to actual measurement / batch specifications.

Load Resistance Rl: Adjustable voltage division to obtain voltage output； Rl affects sensitivity and linearity, need to optimize matching with the target gas.

Environment and Stability: Standard test 20 ± 2 ℃, 65 ± 5% RH； For long-term storage, recommend - 20 to + 60 ℃, dry sealed； Avoid high concentration gas, silicon vapor and water condensation before powering on.

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

Non-selective and Cross-Sensitivity: Responds to benzene, toluene, formaldehyde, alcohol, and smoke； Need to evaluate interference in the target scenario and calibrate.

Data Variations Explanation

Heating Power Consumption: Mainstream data is ≤ 300 mW, also described as ≤ 240 mW, it is a batch / version difference, refer to actual measurement and batch specifications.

Heating Resistance: Commonly about 95 ± 10 Ω, some data 85 - 130 Ω, recommend designing bias based on batch actual measurement.

Specifications: