Carbolite TVS Series - Manual (Page 2)

HZS, TVS
2
MF24 – 3.44
1.0 I NTRODUCTION
1.1 Models in the Range
The HZS and TVS range of 1200°C split tube furnaces is available in a variety of styles and
orientations. The principal varieties are:

vertical TVS, without outer casework , optionally with a wall bracket, for customer mounting;

vertical TVS as above, with a stand. One half of the furnace is fixed to the stand. This is
known as a “near hinge” arrangement;
 vertical TVS with a “far hinge” arrangement. Both halves of the furnace hinge from the stand;

horizontal HZS, in an outer case;

horizontal HZS as above, but fitted to an “L-stand” which can be used in a horizontal or
vertical position.
In all the above the furnace heating section and the electrical characteristics are the same.
The standard control arrangement for these 3-zone furnaces is for slave end zone controllers to
follow the temperature of the main controller. The end zones are quite short – 150mm in all
models. There are optional alternatives to this control arrangement, including independent control
of the heating zones, and the furnaces may also be ordered with equal zone lengths. Note that the
original design intent in these “3-zone” models is to achieve an extended uniform single zone.
When independent control is fitted, some temperature difference can be achieved, but Carbolite
can make no specific warranty as to the extent to which this is possible.
1.2 Voltage and Power Control
All models in this range, from March 2001, are supplied with heating elements designed for use
over the voltage range 200V-240V or 3-phase equivalents. The Carbolite control system
incorporates a “power limit” which effectively limits the voltage to 208V. It is most important that
any alternative system provided by the customer should be able to limit the power accordingly. See
sections 3.7 and 8.2.
1.3 Switches and Lights
1.4 Warning Symbols
Instrument switch: when the instrument switch is operated the temperature
control circuit is energised.
Heat Light: the adjacent light glows or flashes to indicate that power is
being supplied to the elements
DANGER of electrical shock–
read any warning printed by this
symbol.
DANGER – hot surface. Read any
warning printed by this symbol.
WARNING: all surfaces of a
furnace may be hot.
DANGER – read any
warning printed by this
symbol.
Heat Switch: the switch disconnects power to the heating elements; unless
this switch is off there is a danger of electric shock when inserting objects
into the furnace