Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 19)

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IM 11B08A01-01E
 FM-X, ATEX, IECEx, TIIS
<Power on>
(1) Power is supplied to the protection system (fl ameproof enclosure).
(2) Protective gas (air) is supplied to the protective gas (Purging air) inlet.
(3) When the internal pressure in the electronics section, which is the control unit and oven unit
1 to 3, exceeds 392 ±20 (Pa), purging to each electronics section begins.
(4) After 21 ±3 minutes purging, power is applied to the electronics section of the control unit.
On the other hand, it does not be applied to the electronics section of the oven unit 1 to 3,
the heater and detector in the oven yet.
(5) When the internal pressure in the oven unit 1 to 3 exceeds 392 ±20 (Pa), purging to each
oven unit begins independently.
(6) After the purging time as follows, 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.
The purging time depends on the fl ameproof certifi cations.
TIIS, FM: 9 ±2.5 minutes
ATEX, IECEx: 11 ±3 minutes
<Power off>
(1) The operation and 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)
(1) When the internal pressure in the electronics section falls below 392 ±20 (Pa), the protection
system immediately shuts off the power supply to the control unit and oven unit 1 to 3.
(2) When the internal pressure described above returns to normal, the procedure starts
automatically from item (4) in <Power on>.
B. Each isothermal oven in the oven unit 1 to 3
(1) When any of internal pressure in the oven falls below 392 ±20 (Pa), the control unit
immediately shuts off the power supply to the electronics section of the relevant oven.
(2) When the internal pressure in the oven returns to normal, the procedure starts automatically
at item (6) in <Power on>.
2nd Edition : May 11, 2012-00