5.0 Operation
5.0
Operation
5.1
Operating Cycle
The product has fan-assisted circulation which operates when the instrument switch is
switched on.
Turn on the instrument switch to activate the temperature controllers. The controllers
illuminate and go through a short test cycle.
Over-Temperature option only
. If the digital over-temperature option has not yet
been set as required, set and activate it according to the over-temperature controller
instructions.
The product will heat up according to the controller setpoint or program, unless a time
switch is fitted and switched off.
DO NOT switch off if the temperature is above 100 °C - damage could be caused to the
fan and motor. Adjust the controller to allow the temperature to fall.
5.2
Operating Program
The program consists of the stages shown in the graph below. The rates of temperature
rise, dwell temperature and dwell times are all adjustable by the operator. The general
format of the program is installed at the manufacturing stage, with initial values as
shown in the table below.
Function
Initial Setting
Program
1
Start
2
Heat at a
controlled rate
heat up at 480 °C/ hour to
300 °C
SEG n 1
rmP.r
tGt
300 °C
rAtE
8 °C per min
3
Dwell for a pre-set
period
dwell at 300 °C for 1 hour
SEG N 2
dweLL
1 hour
4
Cool at a controlled
rate
Cool to 80 °C assisted by
inlet blower
SEG n 3
rmP.r
tGt
80 °C
rAtE
20 ° C per min
5
Dwell for a pre-set
period
80 °C for 12 hours
SEG n 4
dweLL 12 hours
6
Cool naturally to
room temperature
SEG n 5
SteP
0 °C
7
Finish
SEG n 6
End
This program causes the chamber to heat up at 480 °C per hour to a temperature of
300 °C. The temperature remains at 300 °C for 1 hour. At the end of the 1 hour dwell
the setpoint changes to 80 °C and the product cools down as quickly as possible to this
12
