Read Before Operating; General Information; Principle Of Operation - Qel QIRF Installation, Operation And Maintenance Manual

QIRF Operation And Maintenance Manual

READ BEFORE OPERATING

All individuals who have or will have the responsibility of using, maintaining, or
servicing this product must carefully read this manual. The product will perform as
designed only if it is used, maintained, and serviced in accordance with the
manufacturer's instructions.

1. General Information

1.1 Principle of Operation

The QIRF Smart Sensor is a microprocessor controlled Refrigerant gas Sensor or
Transmitter using infrared sensing technology. The concentration of Refrigerant is
measured by determining the amount of absorption of light in a specific frequency band.
As most gases have their characteristic spectra in the infrared. Those spectra derive from
the molecule's composition in such a way that no two molecular gases have the same IR
spectrum. IR spectra are the fingerprints of gases, and thus allow gases to be uniquely
identified.
By transmitting a beam of IR radiation through the air, or through any particular gas
volume, and recording how much is transmitted at selected spectral lines, one may decide
which gases are present and how much of each. This is a standard and well-proven
principle, routinely used in laboratory analyses of chemical species, and is also the basis
on which our sensors are made.
An IR detector is essentially a temperature sensor and is, therefore, potentially very
sensitive to changes in the ambient temperature. However, our QIRF smart sensor
modules do it better, faster, and more precisely. The QIRF smart sensors are entirely
electronic with no moving parts, and are built around our unique QT Gas Sample Cell
with constant temperature control integrated with IR Source and IR Detector together.
This makes our IR smart sensors work from -45°C to 65°C without being susceptible to
ambient temperature fluctuations.
QIRF Operation Manual May. 01, 2012
3
85050-301-000 Rev C