VERDER CARBOLITE GERO ABA 7/35B, Installation, Operation And Maintenance Instructions, Page: 25 / 94

4.0 Safety Features
In this section the word ‘user’ is to be interpreted as any person with access to or
responsibility for the ABA 7/35B and its ancillary equipment.
4.1 Electric Shock Risk Lamps
Opening the chamber door causes power to the heating elements to be
disconnected at both ends of the circuit.
Any failure of the relays involved in this switching causes one or two red Electric Shock
Risk lamps to illuminate; see sections 5.1 and 5.2.
The user is thereby warned that if, when the door is open, either or both of the electric
shock risk lamps are illuminated, then there is risk of electric shock from the exposed
heating elements.
The user should disconnect the equipment from the power supply and correct the fault
(see section 27.0).
A switch is provided to test that the warning lamps are themselves working; see section
5.0.
The user is responsible for regular checking using the test switch.
4.2 Power Failure Safety Feature
A power failure could occur during a test, leaving an incompletely burnt
sample and a chamber containing explosive or volatile matter. An
interruption of power is normally signaled by the display of the Carbolite
Gero logo on the balance display screen.
On a power failure, the door remains locked and automatically opens only on restarting
and safe completion of the test.
It may be necessary in some circumstances to bypass the door lock and a key is
provided for this purpose. Safe use of the key is the user’s responsibility.
4.3 Access to the Plenum Chamber
Soot can accumulate in the airway following the after-burner, giving rise to
fire risk.
The plenum chamber can be cleaned by first removing the upper panel on right side of
the case. Then loosen the 6 screws (DO NOT remove the screws) holding the removable
panel of the plenum chamber and remove the panel by sliding it sideways off the
screws to reveal the inside of the plenum chamber. see section 21.5.
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4.0 Safety Features