Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 174)

<3. Basic Operation and Startup>
3-23
IM 11B08A01-01E
(5) Additional tightening of LSV
Tighten LSV additionally by 1/8 turn with an LSV hook spanner wrench after the temperature of
the isothermal oven has become stable.
(6) Supplying combustion hydrogen or makeup gas and combustion air
This applies to FID, FID with a methanizer, or FPD.
Start the supply of combustion hydrogen or makeup gas and combustion air. Set the pressure
according to 1.5 Methods of Measuring and Setting the Pressure and Flow Rate of Gases. Finally
decide on pressure and fl ow rate after the temperature of the isothermal oven has become
stable.
NOTE
While the power supply is cut, the supply of hydrogen gas into the isothermal oven is stopped
according to the explosionproof standard.
IMPORTANT
Since a pressure of higher than 1 MPa may damage GC8000, follow the procedure below when
supplying gas from a cylinder:
(1) Shut the regulator of the cylinder.
(2) Confi rm that the secondary pressure of the regulator is zero.
(3) Open the main valve of the cylinder gradually.
(4) Set the secondary pressure of the regulator to 700 kPa.
(5) For hydrogen gas, set the secondary pressure of the regulator to 500 kPa. The
explosionproof standard requires the supply pressure of hydrogen gas to be 500 kPa.
When using instrument air as combustion air, set the supply pressure 100 kPa higher than the set
pressure of combustion air described in the Operation data.
(7) Confi rming fl ow rate of various gases
Confi rm that the fl ow rates of various gases are equal to the values described in the Operation
data.
3.2.4 On/Off operation of detectors
The detectors of GC8000 are off even after when the power is supplied. However, the detector
is turned on automatically after the power-on if the Automatic operation setting of the System
setting has been set to Yes.
The On/Off operation differs for each detector. The On/Off operation method and notes for each
detector are as follows:
Only TCD can be turned off. FID and FPD stop combustion and are turned off only when the
supply of combustion hydrogen or combustion air is cut while the alarms of DET1-1 FRAME
OUT, DET1-2 FRAME OUT, DET2-1 FRAME OUT, DET2-2 FRAME OUT, DET3-1 FRAME OUT,
and DET3-2 FRAME OUT are raised.
When using hydrogen as carrier gas, turn on the hydrogen limiting unit and then turn on the
detector. The indication of input signals, fi ltered signals, and standard deviation of signals of the
detector is updated only when the operation mode is Run or Manual run status.
2nd Edition : May 11, 2012-00
3