
Biomass Gas Analyzer (ZPAF)
Measures H2S, CH4, CO2, and O2generated in biogas plants
- Simultaneous and continuous monitoring of H2S, CH4, CO2, and O2
- Compact and lightweight: 19-inch rack mount, 9 kg
- Easy-to-see LCD
- Optional functions include: automatic calibration, concentration alarm, remote input for switching range, and more.
Specifications
| Principle | CH4 & CO2: single-beam NDIR sensor O2: Galvanic cell sensor H2S: Constant-potential electrolytic sensor + Sample-switching system |
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| Display | 4-digit backlit LCD | |||||||||||||||
| Ranges |
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| Number of measurable components | Max. 4 (simultaneous and continuous measurement) | |||||||||||||||
| Analog output | 4–20 mA DC or 0–1 V DC (up to 12 points) | |||||||||||||||
| Contact output (option) | SPDT relay contact (up to 15 points): device error, calibration error, range identification, auto-calibration status, solenoid valve drive for auto-calibration, limit alarm | |||||||||||||||
| Contact input (option) | Voltage contact input (12–24 V DC, up to 9 points) Remote switchover of ranges, auto-calibration remote start, remote hold |
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| Communication (option) | RS-485 (MODBUS) | |||||||||||||||
| Output hold | During calibration, output signal can be hold at the value before calibration. | |||||||||||||||
| Range switchover | Manual or automatic | |||||||||||||||
| Power supply voltage | 100–240 V AC, 50/60 Hz | |||||||||||||||
| Power consumption | Approx. 100 VA | |||||||||||||||
| Dimensions | H 133 × W 483 × D 382 mm | |||||||||||||||
| Ambient temperature | CH4 & CO2: 5–40°C H2S & O2: 15–40°C |
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| Weight | Approx. 9 kg | |||||||||||||||
| Gas inlet/outlet | Rc 1/4 or NPT 1/4 internal thread | |||||||||||||||
| Sensor life expectancy | O2 sensor: approx. 2 years H2S sensor: approx. 1 year |
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| Certification | CE Marking |
Performance
| Repeatability | ±0.5% FS (H2S: ±2.0% FS) |
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| Linearity | ±1% FS (H2S: ±2.0% FS) |
| Zero drift | ±2% FS per week |
| Span drift | ±2% FS per week (H2S: ±2.5% FS) |
| Response time (for 90% response) |
10–30 s (H2S: 180 s) |
Gas conditions
| Flow rate | 0.5 ±0.2 L/min |
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| Temperature | 10–50°C |
| Pressure | ≤ 10 kPa |
| Dust | ≤ 100 μg/Nm3 with particle size ≤ 0.3 μm |





































