Instruction Manual

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IM 11B08A01-01E
 Safety Instructions
This content described as follows is only for ATEX and IECEx.
● Specifi cation of safety system
Protection system Oven safety unit
Power supply Install in accordance with the specifi cation
of GC8000
Ambient condition
Threshold
value
Pressure 392 ±20 Pa
Flow rate of protection gas 35 L/min
Time Purging time 21 ±3 min 11 ±3 min
Safety response time < 2 sec
Safety
characteristics
HFT (*1) 1
SIL (*2) 2
Proof test interval No needed At least once within
3 years
Replacement interval (*3) At least once within
12 years
At least once within
27 years
Type of
protection
Protection system itself Ex d Ex px
Protection target Ex px
(*1) HFT: hardware Fault Tolerance
(*2) SIL: Safety Integrity Level
(*3) This interval is the longest period to maintain explosion proof function and does not mean that the system is under warranty
during the interval.
● Installation and wiring works
The safety system is built-in GC8000. Installation and wiring into GC8000 are completed before
shipping.
• Do not use for other than GC8000.
• Do not change connection of cables and harnesses.
● Action in Emergency
Relays and SSRs in safety system will be in safe state (contact opens) when de-energized.
In emergency, stop supply of power to GC8000 immediately and contact your nearest Yokogawa
representative.
• In a normal situation, follow the procedure of “3.3.4 Stopping operation” for shutdown, or
GC8000 may be damaged.
● Regular proof test
In order to maintain the safety function, proof test at least once while test period below is
necessary. Contact your nearest Yokogawa representative.
If proof test is not performed for longer than test interval, GC8000 cannot be used as explosion
proof equipment.
Protection system Oven safety unit
Test interval No needed 3 years
● Replacement
In following case, stop supply of power to GC8000 immediately and replace the safety system.
• Safety function does not work correctly.
• Safety system is used over replacement interval.
Replacement is needed even if all safety functions work correctly.
Contact your nearest Yokogawa representative.
Protection system Oven safety unit
Replacement interval 12 years 27 years
2nd Edition : May 11, 2012-00