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| Brand | ONUEE |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic |
| Model | UE2040 |
| Instrument Type | Portable |
| Measurement Principle | Tunable Diode Laser Absorption Spectroscopy (TDLAS) |
| Target Gas | CH₄ (Methane) |
| Measurement Range | 0–100 ppm (FS) and 0–40,000 ppm (FS) |
| LOD (2σ) | ≤0.4 ppm (standard), ≤0.15 ppm with 10-s averaging |
| Accuracy (2σ) | ≤0.8 ppm (low range), ≤0.25 ppm/10 s (low range), ≤250 ppm (high range), ≤100 ppm/10 s (high range) |
| Sampling Frequency | 2 Hz |
| Response Time (T90) | ≤1.8 s at 2 L/min |
| Resolution | 0.01 ppm |
| Linearity & Repeatability | Included in accuracy specification |
| Cross-Interference | Application- and gas matrix-dependent |
| Output Signals | RS485, 4–20 mA |
| Operating Temperature | −10 to +65 °C |
| Operating Humidity | 0–99% RH (non-condensing) |
| Operating Pressure | 800–1100 mbar |
| Storage Temperature | −40 to +80 °C |
| Storage Humidity | 0–99% RH (non-condensing) |
| Power Supply | 10–30 VDC |
| Brand | ONUEE |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | UE50 |
| Instrument Type | Online Fixed-Mount Gas Analyzer |
| Measurement Principle | NDIR for CH₄/CO₂ |
| Monitoring Channels | 1–8 configurable sample inlets |
| Operating Temperature | 0–50 °C |
| Power Supply | 220 VAC ±10%, 1 A ±5% |
| Dimensions (L×W×D) | ~600 × 600 × 250 mm |
| Weight | ~45 kg |
| Display | Integrated industrial-grade touchscreen HMI |
| Gas Filtration | Replaceable hydrophobic fiber filter cartridge |
| Sample Flow Rate | ~600 mL/min |
| Response Time (T90) | CH₄/CO₂: 30 s |
| O₂/H₂S | 60 s |
| Accuracy | CH₄/CO₂: ±2.0% FS |
| O₂ | ±3.0% FS |
| H₂S | ±3.0% FS |
| Output | 4–20 mA per channel (configurable) + RS-485 Modbus RTU |
| Alarm Logic | Dual-level user-defined threshold alarms with latching relay output and configurable reset value |
| Brand | Geotech (UK) |
|---|---|
| Origin | USA |
| Manufacturer Status | Authorized Distributor |
| Origin Category | Imported |
| Model | SEM5K |
| Instrument Type | Portable |
| Measurement Principle | Tunable Diode Laser Absorption Spectroscopy (TDLAS) |
| Detection Target | CH₄ only |
| Range | 0 ppmv to 100% vol |
| Response Time (T90) | ≤2.5 s (standard configuration) |
| Accuracy | ±0.7 ppm (1–10 ppm), ±10% FS (10–10,000 ppm) |
| Resolution | 0.1 ppm / 0.1% vol |
| LOD | 0.3 ppm |
| Pump Flow Rate | 0.6–1.0 L/min (typ. 0.8 L/min) |
| Operating Temp | −25°C to +50°C |
| IP Rating | IP65 |
| ATEX Certification | II 2G Ex ib op is IIB T3 Gb (Ta = −25°C to +50°C) |
| Dimensions | 229 × 97 × 109 mm |
| Weight | 1.3 kg |
| Battery | Rechargeable Li-ion (3.7 V, 4000 mAh) |
| Runtime | 10 h @ 20°C (backlight on), 8 h at temperature extremes |
| Charging Time | 4.5 h (from full discharge) |
| Display | 240 × 128 pixel monochrome graphic LCD |
| Connectivity | Integrated GPS (2–4 m accuracy), Bluetooth 4.0 |
| Enclosure Material | Carbon-fiber-reinforced polyamide |
| Alarm | Audible (65 dB(A) @ 30 cm), visual, and vibration alerts |
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