INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
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3.3.7. Reset Alarms Menu
3.4. TEMPERATURE CONTROLLED OVEN
3.4.1. Furnace temperature control unit
The zirconia cell must operate at a temperature above 600ºC. For optimal
performance, a set-point temperature of 812ºC was chosen. The oven that serves as
the heating device for the zirconia cell is made of a metal wire-wound heating
element. To minimize energy consumption, the heating element is encapsulated by
glass-fibre insulating material. The driving voltage for the heater is 120VAC. The
power is controlled by computer.
The temperature controller utilizes a PID algorithm to drive a solid-state relay, which in
its turn controls the on/off ratio of the voltage to the heater element, to generate
alarms and to enable the system to compensate for temperature changes.
The oven temperature is controlled by software included in the operating system of the
analyzer. All settings are factory programmed but may need to be fine-tuned depending
on local conditions. However, for servicing purposes it can be useful to change the
temperature of the oven. The temperature of the oven is displayed on the right-hand
side of the display screen.
By accessing the Temperature menu is the measurement screen, one can increase the
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