Gas Analyzer
Respiratory Gas Analyzer
Overview
The Gas Analyzer allows the continuous measurement of respiratory gas concentrations from rats through to humans. It houses an infrared carbon dioxide sensor and optical oxygen detector. The CO2/O2 respiratory gas analyzer samples expired gas from a mixing chamber with a damped, micro-vacuum sampling pump. A flow control knob on the front of the unit provides sampling rates of 35 to 200 ml/min, although maximum flow values may vary for different sizes and lengths of tubing.
Included with the Gas Analyzer:
For use with:
- Gas Mixing Chamber (recommended when using human subjects)
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Key Features
- Variable sampling flow rates from approximately 35 ml/min to 200 ml/min.
- An in-line filter attached to the sampling port of the Gas Analyzer to protect the transducers against moisture and damaging particulates.
- An infrared CO2 sensor and an optical O2 detector fed from a damped micro vacuum sampling pump.
- Automatic calibration of the CO2 and O2 channels when connected to PowerLab.
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Details and Tech Specs
Technical
- Sampling system: One CO2 and one O2 transducer fed from a damped, micro-vacuum pump.
- Gases: Must be non-corrosive and non-flammable. A moisture removal scheme must be employed before the sampling inlet.
- System sampling flow rate: Approximately 35–200 ml/min (user variable).
- Internal damping volume: 75 ml
- Gas connector: plastic luer
- Moisture filter: It is recommended that a 0.45 μm hydrophobic membrane filter be fitted before the sampling inlet.
- Materials in contact with gas: 316 stainless steel, sapphire, Nylon 66, silicone rubber, epoxy varnish
- Warm-up time: 10 minutes at 20 °C
CO2 System
- Type: Infrared, optical
- Range: 0–10% CO2
- Output: Linear, 0–1 V (0–10% CO2)
- Resolution: 0.1% CO2
- Linearity: ±0.1% CO2
- Drift: 0.1% CO2 over 8 hours
- Response time (10–90%): 90–130 ms @ 200–50 ml/min - transducer alone; 440 ms @ 200 ml/min sample flow with Nafion tubing and hydrophobic filter connected to sample inlet port
- Temp coefficient: Zero: <0.01% CO2/°C
- Span: <0.02% CO2/°C
O2 System
- Type: Visible spectrum (760 nm) absorption
- Range: 5–100% O2
- Output: Linear, 0.05–1 V (5–100% O2)
- Linearity: ±0.2% O2
- Response time (10–90%): transducer 130–300 ms between 200–50 ml/min
- Cross-sensitivity: ±0.2%
- Resolution: 0.01% O2
- Drift: 0.1% O2 over 2 hours
Operating Requirements
- Power supply: 85–250 VAC 50/60 Hz
- Peak power requirements: 60 VA
- Temperature range: 5–35 °C
- Humidity: 0–90% (non-condensing)
Signal Outputs
- Analog output: BNC connectors
Physical Configuration
- Dimensions (h × w × d): 60 mm × 300 mm × 300 mm (2.36" × 11.8" × 11.8")
- Weight: 5 kg
