This powerpoint presentation presents an AwwaRF project on issues with ultraviolet sensors that included: guidelines and standards do not agree;
commercial sensors do not meet
guidelines;
lack of consensus on key sensor
properties should be defined and
measured; and,
poor sensor performance observed in
prior studies. Project approach was designed to
develop UV sensor guidelines and included:
a literature review and vendor survey;
European and North American field
evaluation;
measure properties of commercial sensors
in laboratory; analyze impacts of measured properties
on dose monitoring using intensity and
CFD-based models; and,
obtain stakeholder feedback on
recommendations. Guidance was developed with
input from UV vendors that included the following:
vendors maintain 3 primary reference sensors to
calibrate working reference sensors;
properties of primary reference sensors measured;
total uncertainty of 5% or better;
calibrate LP sensors using LP light and MP
sensors using MP light; UV sensors have germicidal spectral response; and,
reference sensors should have an independent
readout. Guidance included:
field calibrate duty sensors using
reference sensors;
use three reference sensors to minimize
reference sensor uncertainty;
wet sensors are not practical for reference
sensor checks without special provision to
easily swap duty with reference sensor;
control rotational orientation of UV
sensors in sensor ports; specify lower bound of working range; and, final report gives properties for reference
and duty sensors defined to meet 20%
reference sensor check criterion specified
by UVDGM. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 36 |
| Published : | 11/01/2008 |
