APOA-370 Ambient Ozone O3 monitor/analyser


The APOA-370 continuously monitors atmospheric ozone concentrations using a cross flow modulated ultraviolet absorption method.

The APOA-370 employs an independent, internal dry-method sampling device to achieve the highest levels of sensitivity and accuracy. The dry method, due to its minimal maintenance requirements and capability of continuously monitoring and instantaneously analyzing gases in their unaltered state, has been a preferred method for monitoring the atmospheric pollution.


Cross-flow modulated ultra-violet absorption detector; Low range: 0-0.1 ppm F.S.
• Heated de-ozonizer removes any O3 in the reference gas to:
– Reduce interference
– Eliminate moisture interference
– Prolong life-cycle of the UV lamp
• Only inert materials (glass or PTFE) contact sample.


PrincipleNon dispersive ultra-violet-absorption method (NDUV)
ApplicationO3 in ambient air
RangeStandard ranges: 0-0.1/0.2/0.5/1.0 ppm; auto range ~ manual range selectable;
can be operated by remote switching.
Optional (measurable) ranges: 4 ranges selectable from 0-10 ppm, within 10 times range ratio;
auto range ~ manual range selectable; can be operated by remote switching.
Repeatability±1.0% of F.S.
Linearity±1.0% of F.S.
Sample gas flow rateApprox. 0.7 L/min
IndicationMeasured value, range, alarm, maintenance screen
AlarmsDuring AIC, zero calibration error, span calibration error, temperature error in ozone separator, light intensity error, etc.
On-screen messages are available in four languagesEnglish, German, French, and Japanese
Input/output• 0-1 V/0-10 V/4-20 mA, to be specified (2 systems: either (1) momentary value and integrated or (2) moving average value)
• Contact input/output
• RS-232C
Power100/110/115/120/220/230/240 VAC, 50/60 Hz (to be specified)
Dimensions430(W) x 550(D) x 221(H) mm
MassApprox. 20 kg

Environmental Protection




O3 – Ozone


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