AO2000 CONTINUOUS GAS ANALYZERS  |  OI/AO2000-EN REV. B  83
 
 
 
Fidas24, Fidas24 NMHC: Gas and electrical connections 
Gas and electrical connections 
 
30 
Power supply 115 V AC or 230 V AC for heating the detector and sam-
ple gas inlet (4-pin plug connector, connecting cable supplied) 
31 
Electrical connection to the heated sample gas inlet (hard mounted)   
32 
Test gas outlet 
33 
Zero gas inlet 
34 
Span gas inlet   
35 
Combustion air inlet 
36 
Combustion gas inlet 
37 
Instrument air inlet 
38 
Exhaust air outlet (screw joint for PTFE or stainless steel tube with 
outside diameter = 6 mm. The inside diameter of the exhaust air line 
must be widened to max. 30 cm downstream of the exhaust air outlet 
to ≥ 10 mm. 
39 
Sample gas inlet, heated or unheated (screw joint for PTFE or stain-
less steel tube with outside diameter = 6 mm) 
40 
Pressure equalizing opening with protective filter (the protective filter 
must be protected against moisture) 
24 V  External power supply 24 V DC (4-pin plug connector) 
Bus  System bus (3-pin socket connector) 
Design of the gas connections unless stated otherwise:   
⅛ NPT female thread for threaded connections (not supplied)