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CES-LANDTEC GEM-500 Landfill Gas Monitor
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Measurement Units and Specifications
 
Measurement Units
Screen 1      
Type  Displayed as USA (Imperial) Metric (SI)
Methane CH4% % by volume % by volume
Carbon Dioxide CO2% % by volume % by volume
Oxygen O2% % by volume % by volume
Balance BAL % by volume % by volume
       
Screen 2      
Type Displayed as USA (Imperial) Metric (SI)
Methane  CH4% % by volume % by volume
Lower Explosive Limit  CH4% LEL % of 5% CH4 % of 5% CH4
       
Screen 3      
Type Displayed as USA (Imperial) Metric (SI)
Static Pressure SP w.c. (H2O) mb (millibar)
Differential Pressure DP w.c. (H2O) mb (millibar)
Temperature  T °F/°C °F 
(degrees Fahrenheit)		 °C 
(degrees Celsius)
 
Screen 4      
Type  Displayed As USA (Imperial)  
Old (past) BTU  BTU OLD Per cubic foot  
Old (past) BTU KJ OLD per cubic meter  
Old (past) Gas Flow  scfm Feet std.  cubic feet per min.  
Old (past) Gas Flow scfm OLD std. cubic meters per min.  
Adj. (present) BTU  BTU ADJ  per hr  
Adj. (present) BTU  KJ ADJ  per hr.  
Adj. (present) Gas Flow  scfm ADJ std. cubic feet per min.  
Adj. (present) Gas Flow  scfm OLD std. cubic meters per min.  
   
Operating Temperature  10 to 104°F/-10 to 40°C
   
Range and Resolution
  Sensor Range Imperial Resolution Imperial
Methane  0-100% 0.1
Carbon Dioxide 0-50%  0.1
Oxygen  0-25% 0.1
Pressure-Differential  0-10"w.c.  0.01
Pressure-Static  0-100"w.c. 0.1
   
Typical Accuracy
 
% Methane
% Carbon Dioxide 
%Oxygen
Concentration 
by Volume
by Volume
by Volume
5% (LEL CH4) +\-0.3% +\-0.5% +\-0.25%
75% +\-1.9% +\-3.0% n.a.
 

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