38
Installation and Operation of
Air Control
Note
Ashing furnaces -60 models contain a
feature to provide air (or inert gas)
flow within the furnace chamber.
Note
A pressurized air line with a minimum
working pressure range of 0 to 40 psi
is required.
Note
If furnace is to be used regularly, the
airline regulator may be left open to 30
psi.
Note
Appropriate exhaust must be provided
to remove smoke and gases produced
in an ashing procedure.
Models F30420-33-60-80, F30420C-60-80,
F30428C-60-80, F30430CM-33-60, F30430CM-
60, F30438CM-60
Installation
Compressed air hook-up
1.
A 0.250 inch tube fitting is located at the rear of
the furnace.
2.
Using 0.250 inch I.D. rubber tubing, connect a
length of tubing from this input fitting to a corre-
sponding 0.250 inch fitting located on the regulat-
ed side of a pressurized air service line.
3.
Prior to making connections at the regulator,
insure that the regulator is turned fully closed (0
psi).
4.
Turn flow control valve located at the bottom of
the flow meter (front control panel) fully clockwise
to closed position.
5.
Turn regulator to maximum output pressure of 30
psi. Check for any leaks at connection points of
connecting tubing.
6.
Open flow control valve slowly until ball in flow
meter reads between 40 to 45 liters per minute
flow rate.
7.
Open furnace door and check that air is exhaust-
ing from the manifold located at the bottom rear
of the chamber.
8.
Turn flow control valve to off (fully clockwise).
Exhaust tubing hook-up
Using accessory tubing available from Barnstead
International (part number AY408X1A for furnace temper-
atures less than 975°C, part number AY718X1 for furnace
temperatures of 975°C or greater) or equal quality 2.5" I.D.
tubing appropriate for the temperatures at which you will
operate your furnace, connect flexible tubing from vent port
at top of furnace case to an appropriate negative pressure
exhaust system. This exhaust system must be capable of
handling smoke and gases produced in an ashing proce-
dure.
