Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 20)

xix
IM 11B08A01-01E
 FM-Y
<Power on>
(1) Protective gas (air) is supplied to the protective gas (Purging air) inlet.
(2) The pressure value is checked if it is indicated the specifi ed one at the pressure gauge.
(3) Wait for 21±3 minutes to keep the protective gas (air) supplied.
(4) Power is supplied to the electronics section of the control unit.
(5) Check if the “Elec. Press. Down” error is not outputted. When this alarm is outputted,
stop the supply of power. In this case, the procedure starts automatically described in “A.
Electronics section (control unit, oven unit 1 to 3)” in <Low pressure in the pressurized
enclosure>.
(6) When the internal pressure in the oven unit 1 to 3 exceeds 392 ±20 (Pa), purging to the
oven unit begins.
(7) After 9 ±2.5 minutes the purging, power is applied to the electronics section of the oven unit.
Then the hydrogen limiting unit, the heater and detector in the oven are ready for operation.
<Power off>
(1) The operation and the supply of sample to be measured are stopped. For the detail
procedure, refer to “3.3.4 Stopping operation”
(2) The detector is turned off. For the detail procedure, refer to “3.2.4 Stopping operation”.
In case of FID, FID with methanizer and FPD, the detector should be “Frame out” with
stopping the supply of make-up gas, combustion gas and combustion air. Then, wait for
over 4 hours.
(3) Each heater of the isothermal oven, LSV and FPD is turned off. For the detail procedure,
refer to “Procedure to Turn off the Heater” in “3.3.4 Stopping operation”.
(4) Wait until the oven temperature drops to near room temperature. Usually it takes over one
hour. For the detail procedure, refer to “3.1.3 How to Check the Temperature at Each Part”.
(5) The supply of power to the protection system is stopped.
(6) After the oven temperature drops, the supply of the Protective gas (air) is stopped. For long-
term operation stop, refer to “3.3.7 Precautions for long-term operation stop.
IMPORTANT
In case of emergency, stop the supply of power immediately. In this case, it may damage to the
analyzer.
<Low pressure in the pressureized enclosure>
A. Electronics section (control unit, oven unit 1 to 3)
When the internal pressure in the electronics section falls below 392 ±20 (Pa), the following
function is activated.
The power supply is not shut off automatically. It should be done manually.
- The alarm is outputted from the contact output.
- The pressure low alarm is indicated on the operation panel.
- The “ALARM” LED is turned on.
B. Each isothermal oven in the oven unit 1 to 3
When the internal pressure in any of the ovens falls below 392 ±20 (Pa), the control unit
immediately shuts off the power supply to the heater and detector in the respective ovens.
The function as follows is also activated at the same time.
- The alarm is outputted from the contact output.
- The pressure low alarm is indicated on the operation panel.
- The “ALARM” LED is turned on.
When the internal pressure in the oven returns to normal, the procedure starts automatically from
item (7) in <Power on>.
2nd Edition : May 11, 2012-00