SGH205 เซนเซอร์ก๊าซ โอโซน Gas Hydrogen Sulfide H2S Sensor Concentration 0-100ppm Analog Current 4-20mA Output-OLED

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The RS-H2S-I20-2 Hydrogen Sulfide Transmitter is a constant potential electrolytic sensor designed for detecting hydrogen sulfide (H₂S) gas in industrial, mining, environmental protection, and animal husbandry applications.

Key Features:
✅ High sensitivity gas detection with accurate PPM measurement
✅ Wide measurement range (0-100 ppm, max 500 ppm)
✅ Analog signal outputs: 4-20mA, 0-5V, 0-10V
✅ Wall-mounted waterproof enclosure for durability and easy installation
✅ High protection level, suitable for various environmental conditions

Wiring Diagram

1. Brown = Power supply DC 10~30V
2. Black = GND
3. Blue = Current Output + 
4. Green = Current Output – 

Example Signal Conversion & Measurement Calculations

Current Output Calculation (4-20mA)

• For a 0-100 ppm hydrogen sulfide detection range with a 4-20mA output signal, the concentration calculation is as follows:

  1. The total measurement range (100 ppm) corresponds to a 16mA signal span (from 4mA to 20mA).

  2. The concentration per 1mA increment is:

     100 ppm / 16 mA = 6.25 ppm

  3. Given an output signal of 12mA, the effective signal above the 4mA baseline is:

     12mA − 4mA = 8mA 

  4. The hydrogen sulfide concentration is then:

     $$8mA\times 6.25\text{ ppm/mA}=50\text{ ppm}$$

  Thus, when the transmitter outputs 12mA, the hydrogen sulfide concentration is 50 ppm.

Voltage Output Calculation (0-10V)

• PPM = (Measured V10)×100\text{PPM}
• $$\text{PPM}$$
• PPM = (10 Measured V​)×100

Example: If the output is 5V, then H₂S concentration is 50 ppm

• Unit Conversion (PPM to mg/m³)
  1 PPM = 1.417 mg/m³