Carbolite ABA 7/35B - Manual (Page 15)

15 MF60 – 1.04
4 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 section 5.1 and section 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 25).
A switch is provided to test that the warning lamps are themselves working; see section 5.1.
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 signalled by the display of the Carbolite 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 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 21.4
The user is responsible for maintaining a clean plenum chamber, and also for regular cleaning
of the chimney and the external flue or ducting system.