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Model 108-L Ozone Monitor

The Model 108-L Ozone Monitor is a versatile EPA-certified Federal Equivalent Method (FEM) for monitoring ambient ozone. The instrument is designed for easy integration into existing ozone or air monitoring systems. With an incredibly small footprint, the Model 108-L is a unique instrument with its ability to provide highly reliable ozone data at a size that makes it easy to incorporate into an existing product.

  • Measurement range of 0-100 ppm with an accuracy/precision of 1.5 ppb
  • EPA-certified as a FEM for regulatory compliance monitoring in accordance with the Clean Air Act (EQOA-0914-218)
  • Available in three user-friendly configurations to meet a variety of ozone monitoring needs


  • Provides accurate measurements of ozone from a few parts-per-billion by volume (ppb) to an upper limit of 100 parts-per-million (ppm) based on UV absorption
  • Standard OEM configuration makes use of the user’s ozone system pump to supply the air sample
  • Lightweight (2.0 lb, 0.89 kg) and has a low power consumption (~2 watt) relative to conventional instruments
  • Requires minimal maintenance, making it well suited for monitoring of ambient ozone and monitoring/control of ozone in industrial settings
  • Available in configurations including Enclosure with Pump and our AQLite Air Monitoring Package
  • Please contact us to discuss the best configuration for your application

Product Enclosures

Standard OEM

Suitable for either mounting in a custom enclosure or using as a component of a larger system.

  • Dimensions (Height x Width x Depth):  8.7 × 4.0 × 3.0 in (22 × 10 × 7.6 cm)     
  • Weight: 2.0 lb (0.89 kg)
  • Power Requirements: 11-28 VDC, nominally 165 mA at 12 V; 2.0 watt
  • Relay: one 2-Level
  • Federal Equivalent Method (FEM)
  • DewLine™ for Humidity Control
  • Robust and easy to service

108-L AQLite Package

Weatherproof enclosure with built-in pump and particle filters. Can be used outdoors for more localized ambient ozone monitoring or indoors for personal exposure monitoring.

  • Dimensions (Height × Width × Depth):  10.1 × 8.1 × 4.4 in (26 × 21 × 11 cm) 
  • Two configurations:  Basic & Standard (Standard has additional measurement and data communication features)
  • Weight:  ≤7 lb (3.2 kg)
  • Data outputs: RS232; Standard AQLite adds Cellular upload to Cloud + Bluetooth + micro SD card 
  • Power Requirement: <7 watt [Basic] or 15 watt [Standard]
  • Relay: One 2-Level
  • Federal Equivalent Method (FEM)
  • DewLine™ for Humidity Control
  • Robust and easy to service
  • More AQLite information


Enclosure with Pump

Adds a miniature pump and simple enclosure to the Model 108-L, enabling ozone measurements in your measurement & data system

  • Includes miniature air pump
  • Dimensions (Height × Width × Depth):  3.3 × 3.8 × 8.6 in (8.4 × 10 × 22 cm) 
  • Weight: 2.8 lb (1.27 kg)
  • Power Requirement: 200 mA at 12 V; 2.4 watt
  • Relay: One 2-Level
  • DewLine™ for Humidity Control
  • Robust and easy to service


  • Accurate ozone measurements based on UV absorption
  • Low power consumption (≈2.0 watt)
  • Small footprint designed for easy integration into ozone systems
  • 4-s response time (2s measurement interval)
  • Relay with 2 set points (based on user’s ozone set points)
  • 02.5 V, 420 mA analog outputs
  • RS232 Output
  • Bluetooth upgrade available
  • WiFi data access available
  • Higher measurement ranges are offered in other instruments in our Model 108 Series Ozone Monitors
    • Please inquire about our Model 108-M (20 ppb – 1000 ppm), Model 108-MH (100ppb – 10,000 ppm), or Model 108-H (0.02 wt% – 20wt%)
  • Model 108-L Ozone Monitor with 3-pin relay connector attached
  • 1.25A power adapter
  • Terminal strip connector (10-pin) wired with serial port connector (9PinM) and power jack (barrel)
  • Serial cable (9PinF-9PinF)
  • External ozone scrubber
  • USB flash drive preloaded with operation manual and other useful documentation
  • NIST-traceable calibration certificate
  • Integration into air quality monitoring systems to provide an accurate and reliable measurment of ambient ozone
  • Replacement of HMOS and Electrochemical sensors in an existing ozone system
  • Monitoring ozone exposure of individuals in the workplace
  • Monitoring and control of ozone in industrial settings
  • Incorporation into ozone disinfection systems
  • Long-term monitoring at remote locations where power is highly limited


Spec Sheet
Measurement Principle UV Absorption at 254 nm, single beam
Federal Equivalent Method (FEM) Yes, modification to EQOA-0914-218
Linear Dynamic Range 0-100,000 ppb (0-100 ppm)
Resolution 0.1 ppb
Precision (1σ for 10-s average; aka rms noise) Greater of 1.5 ppb or 2% of Reading
Limit of Detection (10-s average, 2σ) 3.0 ppb
Accuracy Greater of 1.5 ppb or 2% of Reading
Calibration NIST Traceable; Annual calibration recommended
Measurement Time, Frequency 2 s, 0.5 Hz
Data Averaging Options 10 s, 1 min, 5 min, 1 hr
Response Time, 100% of Step Change For 2-s output: 4 s, 2 data points
For 10-s output: 20 s, 2 data points
Adaptive Filter Available, user-specified parameters
Data Transfer Baud Rate 2400
Ozone Units ppb, pphm, ppm, µg m-3, mg m-3
Temperature Units oC, oF, K
Pressure Units mbar, torr, psi
T and P Corrected Yes
DewLine™ for Humidity Control Yes
Operating Temperature Range 0 to 50oC (0 to 40oC for FEM)
Flow Rate Minimum required: 0.6 L/min; Nominal: 1 L/min; Maximum: 1.5 L/min
Data Outputs RS232; 0-2.5 V, 4-20 mA
Power Requirements 11-28 V DC, nominally 165 mA at 12 V DC, 2 watt
Relay with 2 Setpoints Yes, responds based on user’s ozone set points
Size 8.7 x 4.0 x 3.0 inches (22 x 10 x 7.6 cm)
Weight 2.0 lb (0.89 kg)
Options Pump, Enclosure, Bluetooth, WiFi, AQLite packages


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