Model 430

Compact Ozone Monitor


​​Ranges Min: 0 - 100 ppb
Max: 0 - 20,000 ppb (user-selectable)
Measurement Units ppb, ppm (user- selectable)
Zero Noise < 1 ppb (RMS)
Span Noise
< 0.5% of reading (RMS) above 100 ppb
Lower Detectable Limit
< 2  ppb
Zero Drift
< 1 ppb/24 hours
Span Drift
< 1% of full scale/24 hours
Response Time
< 35 seconds to 95%
1% of full scale
0.5 ppb or 0.5% of reading above 100 ppb​
Sample Flow Rate
800 cc/min +/-10%
Typical Power Consumption
12VDC, 9W
Analog Output Ranges
0 - 5V
Analog Output Resolution
16-Bit Resolution 
Internal Data Storage Capacity
10,000 lines (1 hr avg = 1.1 yr)
Included I/O
1 x RS-232
1 x 0-5V analog output
5 x 0-5V analog input
1 x SD card slot
Operating Temperature Range
5 - 40ºC (with US EPA approval)
Dimensions (HxWxD)
4.2" x 7.1” x 10.2” (107 x 180 x 597 mm)
​5.2 lbs (2.4 kg)
Humidity Range 0-95% RH non-condensing

Specifications are subject to change without notice.
All specifications are based on constant conditions.​​
US EPA Federal Equivalent Method EQOA-1015-229



  • Proven UV Absorption bench used in our popular line of Industrial Ozone products.
  • Highest quality of construction.
  • Rugged and lightweight ABS polycarbonate chassis with handle.
  • Well suited for portable, low power monitoring applications.
  • Wide operating range.



08311C - MANUAL, MODEL 430, Operation.pdf430 Manual603 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000089G - 430.pdf430 Specification457 KB
SAL000089G-CN 430.pdf430规格 (Chinese Specification)479 KB
SAL000107B - Industrial Gas Instruments Overview.pdfIndustrial Gas Instruments Overview545 KB
SAN19-0004A - TECHNOTE Portable Ozone Monitoring with the Model 430.pdfPortable Ozone Monitoring with the Model 430171 KB



The Model 430 O3 Monitor is a c​ompact instrument that uses the proven UV-absorption principle. The small footprint and robust design make it ideal for a variety of applications where portability and accuracy are both necessary.​