HUMAN ENERGY MEASUREMENT AND ANALYSIS

GEMNutrition

GEM Open Circuit Indirect Calorimeter
The GEM is an open circuit indirect calorimeter designed for nutritionists needing to measure energy balance and substrate turnover.  The compact bedside unit measures gas exchange volumes, respiratory quotient and energy expenditure.
 
The GEM determines a persons energy expenditure by alternatively measuring O2and CO2  concentrations of inspired and expired air.  Flow rate is continually measured to determine the dilution factor.
 
Gas collection is via a comfortable ventilated hood placed over the patients head.  Air flow through the hood is completely variable between 20 and 80 litres/min to give optimum conditions for patient comfort.
Lightweight flexible tubing connects the hood to the calorimeter, allowing the unit to be some distance away from the hood.  A standard disposable heat and moisture exchange filter in the air line removes particulates and prevents cross contamination.
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Automated Calibration
Calibration uses two cylinders of reference gas which may be mounted on a portable trolley.  The calibration procedure is completely automated and software controlled.
High Accuracy
The latest transducers for O2 and CO2 and flow rate measurement, combined with state-of-the-art data acquisition and control electronics, ensure highly accurate measurements.  Great care has been taken in sample conditioning prior to anlaysis, to ensure all gases enter the analysers under the same conditions.  In particular, NafionR tubing is used to avoid measurement errors created by water vapour in breath.
Intuitive Software Controlled
The whole system is controlled by custom designed Windows style software on a standard PC. 
The software is intuitive, easy to use and offers increased flexibility for more demanding users.
Variable air flow rate from 20 to 80 l/min for measurement across a range of patients.
Highly automated operation
Latest transducers for accurate measurement of flow, O2 and CO2
PC based Windows software designed for ease of use
Real time graphical or tabular displays of VO2, VCO2, RQ and EE
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Specification
Measurement Technique
Open circuit flow through indirect calorimeter for measurement of spontaneously breathing patients.
 
Oxygen Measurement
High performance paramagnetic oxygen analyser.
Range: 0-100%
Linearity:+0.1%
Repeatability: +0.01% abs
 
Carbon Dioxide Measurement
Infra red carbon dioxide analyser
Range: 0-2.5% (other ranges available)
Linearity: +1%
Repeatability: +0.02% abs
Power
100/120/220/240 V+10%, 50-60Hz, spike-free, single phase, 240W
 
Dimensions
Instrument: 495 mm wide, 430mm deep, 250mm high
Hood: 340mm wide, 530mm deep, 270mm high
 
Weight
26Kg
 
Environment
15-30o relative humidity <80%
 
Calibration
Requires span and zero gas
1. 1% CO2 , 21% O2 , balance N2
2. 99.998 N2
Flow measurement
Thermal mass flow meter, gives flow rate at standard temperature and pressure.
Range: 0-100 litres/min
Accuracy: +1% including linearity
Repeatability: +0.2% abs
 
Sample rate
Approximately 120ml/min
 
Warm up time
At least 30 minutes
 
Power
100/120/220/240 V+10%, 50-60Hz, spike-free, single phase, 240W
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PLEASE CONTACT US TO DISCUSS GEMNUTRITION AND INDIRECT CALORIMETRY - SUPPORT, ADVICE AND CONSULTANCY