2B Technologies

Comparison of 2B Tech Ozone Monitors™

Which ozone monitor should I purchase?

The following table compares the specifications of the various 2B Tech Ozone Monitors and is meant to be helpful for deciding which Ozone Monitor is best for your application. The table is followed by a discussion of the suitability of the different models to various applications. If you have questions or need help with selecting the Ozone Monitor best suited to your needs, please do not hesitate to contact us.

Specification	Model
Specification	202	205	OEM-106-L	OEM-106-M	OEM-106-H
Measurement Principle	UV Absorbance	UV Absorbance	UV Absorbance	UV Absorbance	UV Absorbance
Linear Dynamic Range	0-100 ppm	0-100 ppm	0-10 ppm	0-1000 ppm	0-10 wt%
Resolution	0.1 ppb	0.1 ppb	1 ppb	0.01 ppm	0.01 wt%
Precision (1σ for 10-s average; aka rms noise)	1.5 ppb or 2% of Reading	1.0 ppb or 2% of Reading	2.0 ppb or 2% of Reading	0.01 ppm or 2% or reading	0.01 wt% or 2 % of reading
Accuracy	1.5 ppb or 2% of Reading	1.0 ppb or 2% of Reading	2.0 ppb or 2% of Reading	0.01 ppm or 2% or reading	0.01 wt% or 2 % of reading
NIST-Traceable Calibration	Yes	Yes	Yes	Yes	Yes
Limit of Detection (2σ)	3.0 ppb	2.0 ppb	4.0 ppb	0.02 ppm	0.02 wt%
Flow Rate (nominal)	1 L/min	1.8 L/min	1 L/min	1 L/min	1 L/min
Flow Rate Requirement	>0.6 L/min	>1.2 L	>0.6 L/min	>0.6 L/min	>0.6 L/min
Baseline Drift	<2 ppb/day <5 ppb/year	<1 ppb/day <3 ppb/year	<3 ppb/day <6 ppb/year	<0.01 ppm/day <0.03 ppm/year	<0.02%/day <0.1%/year
Sensitivity Drift	<1%/day <3%/year	<1%/day <3%/year	<1%/day <3%/year	<1%/day <3%/year	<1%/day <3%/year
Measurement Time, Frequency	10 s, 0.5 Hz	2 s, 0.1 Hz	10 s, 0.1 Hz	10 s, 0.1 Hz	10 s, 0.1 Hz
Response Time, 100% of Step Change	20 s 2 points	4 s 2 points	20 s 2 points	20 s 2 points	20 s 2 points
Averaging Times	10 s, 1 min, 5 min, 1 hr	2 s, 10 s, 1 min, 5 min, 1 hr	10 s, 1 min, 5 min, 1 hr	10 s, 1 min, 5 min, 1 hr	10 s, 1 min, 5 min, 1 hr
Ozone Units	ppb, ppm, pphm, µg m^-3, mg m^-3	ppb, ppm, pphm, µg m^-3, mg m^-3	ppb, ppm, pphm, µg m^-3, mg m^-3, mol %, wt %	ppb, ppm, pphm, µg m^-3, mg m^-3, mol %, wt %	ppb, ppm, pphm, µg m^-3, mg m^-3, mol %, wt %
Pressure Units	mbar, torr	mbar, torr	mbar, torr	mbar, torr	mbar, torr
Temperature Units	°C, K	°C, K	°C, K	°C, K	°C, K
T and P Corrected	Yes	Yes	Yes	Yes	Yes
Power Requirement; Supplied by battery or 110/220 VAC Power Pack	12 V dc, 335 mA, 4.0 watt	12 V dc, 415 mA, 5.0 watt	12 V dc, 290 mA, 3.5 watt	12 V dc, 290 mA, 3.5 watt	12 V dc, 290 mA, 3.5 watt
Size	3.5 x 8.5 x 11 in (9 x 21 x 29 cm)	3.5 x 8.5 x 11 in (9 x 21 x 29 cm)	2.5 x 7 x 9 in (6 x 18 x 23 cm)	2.5 x 7 x 9 in (6 x 18 x 23 cm)	2.5 x 7 x 9 in (6 x 18 x 23 cm)
Weight	4.7 lb (2.1 kg)	4.7 lb (2.1 kg)	1.7 lb (0.8 kg)	1.7 lb (0.8 kg)	1.7 lb (0.8 kg)
Data Logger Capacity	14,336 lines	14,336 lines	14,336 lines	14,336 lines	14,336 lines
Analog Inputs for Internal Logging of Other Instruments, 0-2.5 V	3 Inputs	3 Inputs	No	No	No
Serial Output, RS232	Yes	Yes	Yes	Yes	Yes
USB Output	External Adapter	External Adapter	Yes	Yes	Yes
Data Transfer Baud Rates	1200, 2400, 4800, 19200	1200, 2400, 4800, 19200	1200, 2400, 4800, 19200	1200, 2400, 4800, 19200	1200, 2400, 4800, 19200
Analog Voltage Output	0-2.5 V	0-2.5 V	0-2.5 V	0-2.5 V	0-2.5 V
Analog Curret Output	Optional 4-20 mA Upgrade	Optional 4-20 mA Upgrade	4-20 mA	4-20 mA	4-20 mA
Output Ranges	User Defined Scaling Factor in Menu	User Defined Scaling Factor in Menu	User Defined Scaling Factor in Menu	User Defined Scaling Factor in Menu	User Defined Scaling Factor in Menu
DewLine™	Yes	Yes	Yes	Yes	Yes
GPS Option	Yes	Yes	No	No	No
Flash Card Option	Yes	Yes	No	No	No
Relay with 2 Setpoints	No	No	Yes	Yes	Yes
Backup Air Pump	Yes	Yes	No	No	No
Flow Meter	Yes	Yes	No	No	No
Upgradable to Dual Beam	Yes	N/A	No	No	No

Applications

Air Pollution Monitoring

The Model 202, 205 and OEM-106-L are all well suited to ambient air measurements where ozone concentrations are typically in the range 0-100 ppb. The EPA air quality standard currenlty is 75 ppb for as an 8-hour weighted average. The Model 106-M and 106-H are not suited to this application. The Model was the first instrument introduced by 2B Technologies and is our most popular ozone and is widely used by the U.S. Forest Service, NOAA, the National Park Service and other government agencies. The Model 202 has been given the method number 901-O3 Model 202 because of its widespread use in monitoring networks. The Model 205 Dual Beam Ozone Monitor offers slightly improved precision and better baseline stability. However, if data are to be averaged for 5 minutes or more, the advantage of a dual beam instrument is minimal since the averaging greatly improves the precision. The critical components of the Model 106-L are identical to those used in the Models 202 and 205. The Model OEM-106-L is built on a single PCB, making it less expensive to manufacture and more compact. The OEM-106-L series will be available soon with an instrument case as the Model 106-L.

Measurements from Aircraft and Balloons

The Model 205 Dual Beam Ozone Monitor was designed specifically for aircraft measurements and vertical profiling using kites and balloons where high spatial resolution requires a fast response time. The Model 205 may be thought of as two Model 202 Ozone monitors working 90° out of phase. One detection cell is measuring sample air while the other is measuring ozone-scrubbed air. The roles of the two cells are switched every two seconds. This allows reporting of new measurements every 2 seconds with a 100% response time of 4 seconds. The Model 205 is the fastest ozone monitor commercially available. The Model 202 and Model 106-L also are useful for measurements on aircraft and balloons but with less spatial resolution.

Workspace Monitoring

Ozone has become widely used in industrial applications such as in HVAC systems for removing hydrocarbons and cigarette smoke from buildings, sterilization of medical instruments, soil and ground water remediation, preservation of fruits and vegetables in warehouses, processing of food products, ozone laundries, etc. The current OSHA limit for exposure of individuals working in those environments is 100 ppb based on an eight-hour average. As for air pollution monitoring, the models most suitable for measurements in this concentration range are the Models 202, 205 and 106-L. The relative advantages of each model are discussed above in the Air Pollution Monitoring Section.

Measurements of Surface Partial Discharges in Large Motors and Electrical Generators

The Model 202 Ozone Monitor has been successfully used for detecting surface partial discharges in electrical generators of hydroelectric power plans. For more details please see the paper by Louis Lépine of Hydro-Québec here. This application requires measurements at low ppb levels. Please contact us for a quote for a complete setup for this application including Model 202 Ozone Monitor, Pelican case for storage, 12-hour external battery, sampling tube and other accessories.

Industrial Ozone

As discussed above, ozone is widely used in industrial applications. The Models 106-M (medium ozone) and 106-H (high ozone) were design with shorter optical benches than the Model 106-L in order to extend the ozone measurement range to 1000 ppm and 10 wt% (30,000 ppm), respectively. The Model 106-M measures ozone in process streams with 0.01% resolution. The Model 106-H is designed for measuring ozone at the per cent level produced by ozone generators. The 106 series has a two-level relay switch for controlling ozone, sounding an alarm, or controlling other processes based on ozone concentration. The Model 106 series has a 4-20 mA output in order to interface with common industrial recording instrumentation. The Model 106 has exchangeable optical benches, so it possible to purchase one instrument and and one or two additional optical benches so cover additional ranges of ozone concentration. Three optical benches allows one to span eight orders of magnitude of ozone concentration.