88 BEIJING:SPN Master pages 12/3/09 01:06 Page 2
spnfeature
PHOTOMETRY
time for new technology for the swimming pool
Photometric pool water analysis can reduce combined chlorines and
improve water and air quality. A study at a large municipal leisure centre
has shown the improved water management reduces the expenditure on
chemicals, water and energy costs by 20%
Photometry technology was used in a high
profile way at the Water Cube facility at the
Beijing Olympics
P
ool water has never been more difficult colour comparison – the same technology concentration of free chlorine – which
to maintain than right now. that pool managers use and trust on a daily is why the HPA relies on the DPD1 test
Pollution is on the increase for many basis. It has been proven that photometric for the mandatory manual monitoring
reasons, not least the longer opening technology will reduce combined chlorines of free chlorine.
hours at commercial pools and the ever and improve both water and air quality As with the photometers used for
increasing use of cosmetics by bathers providing a standard that not only makes manual tests, recalibration is only
using the pool. for better bathing conditions but keep required very rarely – typically 0.1
And while public health requirements public health happier too. ppm drift in a year of operation.
are monitored by an ever more skilful Arch Water Products have been working With electrode based technology,
inspector, the water quality provided to with this technology now for many years readings are affected by a wide variety
the bather constantly has to meet tighter and were recently rewarded when it was of factors such as TDS, water flow
controls. Put these issues against a selected as the preferred method of rate, pH etc. This is why there is need
backdrop of facility operators facing analysis and control for all the pools at the for regular (in worst cases) daily
constant financial and operational Water Cube facility at the Beijing Olympics. recalibration.
constraints whilst health and safety The system in the UK is distributed and All electrode based systems are
demands seem only to increase and plant installed under the name of ‘The HTH susceptible to contamination of
room engineers seem to be a dying breed. Professional’ and in conjunction with one electrode surfaces by contaminants
To address these issues facing all sorts of their equipment distributors ‘Pool such as oily deposits (natural body oils,
of pool administrators, help could lie in Sentry’ the automatic controller has moved sun screen, cosmetics etc) which is why
photometric pool water analysis. on to greater levels. they need regular cleaning.
This relatively new technology to the UK The HTH Professional’s features have
swimming pool market had previously already made vast savings in many pools A study at a large municipal leisure centre
been cost prohibitive and only found in across the UK. Here’s how that happens: has shown that the improved water
high specification applications, but is now management made possible by the
available at a price comparable with The advantages of the photometric combination of the HTH Professional
ordinary automatic controllers. DPD1 test over ‘chlorine electrodes’ (e.g. Controller and the Pool Sentry Service
Photometry differs greatly to redox, amperometric or specific ion package can reduce the expenditure on
amperometric and redox technology that use electrodes) are: chemicals, water and energy costs by 20%,
probes to assess the sanitiser level based on The precision (i.e. the reproducibility) even in a facility that had been previously
measuring conductivity in the water. of the measurement is + =0.02 ppm run to a high standard.
Photometric technology measures free chlorine.
chlorine content using the universally The DPD1 test is the ONLY test that Brian Tyler is the Commercial Accounts
employed method of DPD reagents and unequivocally measures the Manager for Arch Water Products
88 swimming pool news APRIL 09 Digital edition available at www.swimmingpoolnews.co.uk
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92