defr Glossar

Ozone measurement

Ozone, a powerful oxidizing agent, is used in many chemical processes and for sterilization in water treatment plants (drinking water treatment). Generators produce the ozone from air or oxygen with the aid of electrical discharges. It is then brought into contact with the medium being treated in reaction chambers.

The ozone demand depends on the nature and quantity of the constituents reacting with the ozone. Things are complicated by the fact that the ozone generators are incapable of delivering a steady concentration, even if a constant flow rate is maintained. Consequently, the continuous measurement of concentration is crucial: following the generators it is used to monitor the quantity produced, and at the reactor outlets it detects the residual concentration.

In the German Standard Method, photometric measurement is referred to as a quantitative measurement technique independent of calibration. However, it is a prerequisite that the absorption is measured with monochromatic light of wavelength 254 nm and that the instrument reading corresponds to an unambiguous extinction value. The SIGRIST photometer meets both requirements: combining an Hg low-pressure bulb with an interference filter guarantees monochromaticity, and the measuring method (alternating beam method) ensures an unambiguous correlation between the extinction and the reading. Under these circumstances the extinction coefficient is 3024 l/mol cm (according to DIN 19627 and IOA, International Ozone Association), and this type of ozone measurement can be regarded as an absolute measurement requiring no calibration with ozone.

The concentration readings (e.g. in g/m3 are valid for the pressures and temperatures prevailing during measurement. If they have to be converted to standard conditions (e.g. g/Nm3 , the following formula applies:

$K = K' \cdot \left( \frac{1013}{p} \right) \cdot \left( 1 + 0.00367 \cdot t \right)$

$K$ concentration under normal conditions (0°C, 1´013 mbar)
$K'$ concentration measure under the specific conditions at the measurement location
$p$ pressure in the flow cell in mbar
$t$ temperature in the flow cell in °C

Therefore the effect of the ambient conditions on the concentration is:

$\frac{-3\%}{+10°\text{C}}$ und $\frac{+1\%}{+10 \text{mbar}}$

The relations between the concentration units normally used are:

$\frac{1 \, \text{g}}{N\text{m}^{3}} = 0.047\,\% \; \text{Vol} = 0.077\% \, \text{Gew.}$

With Nm3 being a cubic meter of standard volume which converts temperature and pressure to the same standard state.

Index

Contact distribution partner

{{selectedCountry.Name}} {{country.Name}}

Please select your businessarea

{{ba.Name}}

Please select

{{area.Name}}

Please select your businessarea

{{ba.Name}}
{{selectedCountry.Name}} {{country.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}} {{area.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}}
Leonardo Pio
Responsible for the application: Water, Industrial Processes, Beverages & Food for the regions: AG, LU, NW, OW, VS, BS, BL, SO, BE, FR, NE, VD, GE and JU
Andreas Corradini
Responsible for the application: Water, Industrial Processes, Beverages & Food for the regions: TI, GR, UR, GL, SZ, ZG, ZH, SH, SG, TG, AR and AI Traffic & Environment: whole Switzerland
Ihr Businesspartner für Getränke & Lebensmittel:
Für Wasser, Industrielle Prozesse, Verkehr & Umwelt kontaktieren Sie unseren Hauptsitz.

Your distribution partner for beverages & food:
For water, industrial processes, traffic & environment please contact our headquarters

Ihr Businesspartner für Getränke & Lebensmittel:
Für Wasser, Industrielle Prozesse, Verkehr & Umwelt kontaktieren Sie unseren Hauptsitz.

Your distribution partner for beverages & food:
For water, industrial processes, traffic & environment please contact our headquarters

Contact headquarters

Ralf Isenberg
Sales Manager ScrubberGuard
Öffnungszeiten:
Montag–Freitag 08:00–12:00 und 13:30–17:00
Feiertage & Betriebsferien:
Seppitag: 19. März 2025, Ostern: 18. – 21. April 2025, Auffahrt: 29. Mai 2025, Pfingstmontag: 9. Juni 2025, Fronleichnam: 19. Juni 2025, Bundesfeiertag: 01. August 2025, Maria Himmelfahrt: 15. August 2025, Allerheiligen: 01. November 2025, Maria Empfängnis: 08. Dezember 2025, Betriebsferien: 24. Dezember 2025 – 04. Januar 2026
Opening hours:
Monday–Friday 08:00am–12:00pm und 1:30pm–5:00pm
Public & company holidays:
St Joseph's Day: 19. March 2025, Easter: 18. – 21. April 2025, Ascension Day: 29. May 2025, Whit Monday: 09. June 2025, Corpus Christi: 19. June 2025, Federal Holiday: 01. August 2025, Assumption Day: 15. August 2025, All Saints Day: 01. November 2025, Conception of Mary: 08. December 2025, Company holidays: 24. December 2025 – 04. January 2026