Infrared Transmitter Unit - CODEL Energy Tech 401 Installation, Operation And Maintenance Manual

EnergyTech 401
Operating and Maintenance Manual
2.1.1 Infrared Transmitter
Unit
Page: 14
At the heart of this unit is a small heater assembly designed by CODEL engineers
to give a high intensity uniform source of infrared energy over a long lifetime, in
excess of two years continuous operation, with a power consumption of only 26
watts. The heater has a stainless-steel cylindrical core, plasma coated with
refractory, and around which is a 'Kanthal' heating element. This is then enclosed
within refractory fibres and encapsulated in an aluminium cartridge. In the
infrequent event of failure, the complete heater assembly can be replaced on site
within ten minutes.
The radiation emitted by the heater is then 'chopped' by a motor-driven disc,
and focused across the duct by a lens. The chopper disc is driven by a small DC
motor. The phase and frequency of the chopper disc are monitored by a
radiation detector to provide a reference signal that is utilised by the signal
processor unit.
The system calibration is achieved by a small gas cell containing pure reference
gas that can be swung into the sight path by means of a 'stepper' motor and
gearbox assembly to enable continuous calibration updates to be maintained.
The chopper motor and stepper motor represent the only moving components
in the entire system.
A printed circuit board mounted at the front of the unit provides control circuitry
for the heater, the motors, and the reference wave detector.
illustrates the transmitter and receiver units.
CODEL
Monitoring Solutions