PEAK
Scientific Instruments Ltd
ZA300 Zero Air Gas Generator
Instructions for use Manual
30
th
March 2005
ZA300 issue 3
14
Catalytic Chamber
The Catalytic Chamber is heated to 400ºC and will cause severe burns if touched. If for any
reason the chamber or its associated parts need to be examined the generator must be switched
off and allowed to cool. THIS COULD TAKE UP TO 10 HOURS.
The Catalytic Chamber takes the form of cylindrical chamber with a heated central core. The annular
space is specifically designed to allow the required contact time with the catalyst to ensure complete
oxidization. The complete chamber is contained within an insulated enclosure as shown below.
Heater
Regardless of the supply voltage the heater is rated at 110 Vac. This minimizes the volt drop across the
conductors and prolongs the life of the element. The Heater is contained within a stainless steel sleeve to
facilitate removal should replacement be required.
Thermocouple
The thermocouple is “K” type spring-loaded bayonet fitting to ensure good contact with the chamber core.
Thermal Fuse
The thermal fuse is provided as a safety feature to cut supply to the heater thus preventing chamber
overheating in the event of a control or ventilation failure. It is a fail-safe device and if blown requires
replacing.
Note: -
The thermal fuse will not blow under normal operation. A blown thermal fuse indicates
that a fault exists which MUST be rectified before attempting to replace the thermal fuse. Refer to
the trouble shooting chart on page 15
for guidance.
Heater
Thermocouple
Thermal
Fuse
Air Inlet
Line
