Gas Analyzer

Overview:

The Gas Analyzer can be used for the measurement of respiratory gas concentrations from small animals, such as rats, through to humans. It contains an infrared carbon dioxide sensor and optical oxygen detector fed from a damped micro vacuum sampling pump. The analyzer samples expired gas from a mixing chamber. A flow control knob on the front of the unit provides sampling rates of 35 to 200 mL/min (Maximum values may vary for different sized and lengths of tubing). The ability to vary the sampling rate of the vacuum pump makes the unit ideal for animal research as well as for use with humans in student laboratories.

The ML206 can be connected to PowerLab systems through the I²C connector. This allows the PowerLab system to automatically recognize the analyzer and provide automatic allocation and calibration of the carbon dioxide and oxygen channels in LabChart. Alternatively the analyzer can be used as a stand-alone instrument, however it will require calibration of the oxygen and carbon dioxide analyzers.

When used with human subjects we recommend using the Gas Analyzer with the MLA246 Gas Mixing Chamber. As well as the necessary power cord and cables the unit is supplied with an Owner's Guide, Drying Tube (MLA0343) and In-line Filters (Pack of 10; MLA0110).

The Gas Analyzer should be used with the Drying Tube and In-line Filter to protect the transducers from moisture or damaging particulates.

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
  
• Ten hydrophobic filters (MLA0110) (0.45 μm pore size) are supplied
• 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
  

Applications:

The ML206 Gas Analyser is used for the measurement of O₂ and CO₂ gas concentration in expired air from small animals through to humans. The air is usually sampled from a Gas Mixing Chamber.

For more information refer to the Respiratory Gas Analysis application page.

Specifications:

• 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 mins @ 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 V A.C. 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

ADInstruments reserves the right to alter these specifications at any time.