18 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Option "Hydrogen monitoring of the analyzer cabinet"
Function
The "Hydrogen monitoring of the analyzer cabinet" option is an additional
safety measure when an FID analyzer is built-in in the analyzer system. If a
leak occurs in the hydrogen path inside the analyzer cabinet and hydrogen
accumulates inside the cabinet, both the hydrogen supply and the power
supply are shut off before the explosion limit is reached – at 40% LEL. This
prevents formation of an ignitable mixture.
Scope of supply and delivery
Installed in the analyzer cabinet:
In the upper area, an ATEX-certified gas sensor with connection socket,
Outside on the right side wall, a solenoid valve that interrupts the hy-
drogen supply at 40% LEL and at power supply failure (H
2
safety valve).
Also supplied:
A gas warning center for evaluating the gas sensor signal,
A contactor for disconnecting the power supply to the analyzer cabinet,
A contactor for disconnecting the UPS if the system is prepared for a
UPS.
Installation
The electrical wiring of the gas sensor and the gas warning center for
switching off the power supply in the event of an alarm has not yet been
completed in the factory delivered condition of the analyzer system.
The gas warning center must be installed outside the analyzer cabinet in a
non-hazardous area in a distribution cabinet or similar. It must be electrically
connected to the gas sensor (see the order-specific set of drawings in this
regard).
The solenoid valve for disconnecting the hydrogen supply as well as the coils
of the contactors and relays for disconnecting the power supply and UPS (if
present) must be connected to a fault-signaling contact in the gas warning
center. The fault-signaling contact must be set so that the voltage is shut
off at 40% LEL and the contact itself latches.
The measuring signals (analog outputs and inputs), the status signals (digi-
tal outputs and inputs) as well as the bus systems of the analyzer system are
so designed that after the power supply (and possibly the UPS) are discon-
nected no component in the analyzer cabinet (contactor, relay, motor etc.)
that could generate an ignition spark can be actuated from the outside.
Potential-free measurement and status signals as well as bus connections
do not have to be disconnected separately in the event of a gas alarm. If,
however, an external signal that is not potential-free is fed in, the operator
must ensure that it is shut-off when the gas alarm is triggered, e.g. via an
isolating relay.
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