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
Display 4-digit backlit LCD
Ranges
Component 1st range 2nd range
CH4 0–20 vol% 0–100 vol%
CO2: 0-20 vol% 0-100 vol%
H2S 0–500 ppm 0–2000/5000 ppm
O2 0–10 vol% 0–25 vol%
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
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
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
Certification CE Marking

Performance

Repeatability ±0.5% FS (H2S: ±2.0% FS)
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
Temperature 10–50°C
Pressure ≤ 10 kPa
Dust ≤ 100 μg/Nm3 with particle size ≤ 0.3 μm

Biomass Gas Analyzer (ZPAF)