Chapter 1 Installation
GC-2014 Service Manual
8
1.4 Gas
1.4.1 Purity
In order to maintain performance specifications, prepare the following gases.
Carrier gas Detector gas
Detector
He
(recommended)
N
2
(usable)
Other H
2
Air Make-up
FID 99.995 % min.
99.995 % min.
99.995 % min.
Compressor air
N
2
, He
99.995 % min.
FID, high
sensitivity
99.999 % min.
99.999 % min.
99.999 % min.
Cylinder air
N
2
, He
99.999 % min.
TCD 99.995 % min.
99.995 % min.
Ar etc.
99.995 % min.
He, N
2
, Ar, etc.
99.995 % min.
TCD, high
sensitivity
99.999 % min.
99.999 % min.
Ar etc.
99.999 % min.
He, N
2
, Ar, etc.
99.999 % min.
ECD 99.999 % min.
99.999 % min.
N
2
99.999 % min.
ECD, high
sensitivity
99.9999 % min.
99.9999 % min.
N
2
99.9999 % min.
FPD 99.999 % min.
99.999 % min.
99.999 % min.
Cylinder air
FTD 99.999 % min.
99.999 % min.
Cylinder air
He
99.999 % min.
* Use air that has been compressed in an oil-less compressor and then dehumidified.
1.4.2 Supply Pressure
Carrier gas: 300 to 980 kPa (300 to 500 kPa for hydrogen)
Make-up gas: 300 to 980 kPa
Hydrogen: 300 to 500 kPa
Air: 300 to 500 kPa
Use the following formulas for approximate conversion between kPa and kgf/cm
2
.
1 kPa = 1.02 10
-2
kgf/cm
2
1 kgf/ cm
2
= 98.1 kPa
Use the following formulas for approximate conversion between kPa and psi.
1 kPa = 1.45 10
-1
psi
1 psi = 6.89 kPa
NOTE
For precautions on handling high-pressure gas cylinders and using hydrogen gas,
refer to the instruction manual for the GC-2014 main unit.
1.5 Work Related Precautions
CAUTION
Do not make direct contact with the injection unit or detector when they are hot.
Otherwise there is a risk of burns.
When the inside of the oven is hot, do not open the doors. Otherwise there will be a
blast of hot air.
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