Scrubberless Ozone Monitor [211]

The new Model 211 Scrubberless Ozone Monitor uses the proven ultraviolet (UV) absorption method in combination with our patented (US Patent No. 8,395,776 B2) gas-phase scrubber technology to measure ozone virtually free of interferences. The instrument is ideally suited for measurements of ozone in heavily polluted air where interference is likely from particulates, mercury, or VOCs. The Model 211 combines the stability of our proven dual beam ozone monitors with our selective scrubber technology to provide accurate ozone measurements in the most polluted air. The enhanced optical path length of 30 cm provides a precision of better than 0.5 ppb for 10-second measurements, and the instrument can output new ozone measurements as often as every 2 seconds. The Model 211 now comes with SD flash card memory as a standard feature.  The Model 211 Scrubberless Ozone Monitor has been designated by the EPA as a Federal Equivalent Method (FEM): EQOA–0514–215.

 

Features

• Interference-free measurement of ambient ozone
• DewLine™ for elimination of water vapor interference, a unique feature of 2B Tech instruments
• Inexpensive, simple, and robust instrument design in a 19” rack mount enclosure
• Internal data logger
• SD flash memory for virtually unlimited portable data storage
• Dual beam, long path (30 cm) optical bench with high precision (< 0.5 ppb)
• NIST-traceable calibration (calibration suggested annually)
• Internal long-life sample pump (20,000 hours)
• EPA Federal Equivalent Method (FEM) for compliance monitoring (EQOA–0514–215)
• Candidate to become a new EPA Federal Reference Method (FRM)
• Convenient user interface, including remote operation via RS-232 communication
• Internal NO generator from non-toxic, non-corrosive nitrous oxide (N2O)
• Very low NO concentration used in comparison to ozone monitors based on NO chemiluminescence

 

Specifications

Measurement Principle	UV Absorbance at 254 nm; Dual Beam
Federal Equivalent Method (FEM)	Yes, EQOA–0514–215
Linear Dynamic Range	0-2,000 ppb (0-2 ppm)
Resolution	0.1 ppb
Precision (1σ rms noise)	Greater of 0.5 ppb or 1% of reading for 10-s average
Accuracy	Greater of 1.0 ppb or 2% of reading
Limit of Detection (2σ)	1.0 ppb
NIST-Traceable Calibration	Yes
Flow Rate (nominal)	~2 Liter/min
Flow Rate Requirement	>1.2 L/min
Baseline Drift	< 1 ppb/day < 3 ppb/year
Sensitivity Drift	< 0.5%/day < 3%/year
Response Time, 100% of Step Change	20 s for 10-s averaging; 4 s for 2-s measurement
Measurement and Averaging Times	2 s, 10 s, 1 min, 5 min, 1 hr
Internal Data Logger Capacity	16,383 lines (10-s avg. = 1.9 days; 1-min avg = 11 days; 5-min avg = 1.9 mo; 1-hr avg = 1.9 yr)
SD Card Logger Capacity	Minimum 2 GB (> 5-year capacity for 10-s measurement mode)
Ozone Units	ppb, ppm, pphm, µg m-3, mg m-3
Pressure Units	mbar, torr
Temperature Units	°C, K
T and P Corrected	Yes
Operating Temperature Range	10 to 50 °C
Operating Altitude Range	~0-13.5 km (150-1,013 mbar) standard; optional ~0-25 km (30-1,013 mbar) with upgraded pressure sensor
Power Requirement; Supplied by Battery or 110/220 VAC Power Pack	11-14 V dc or 120/240 V ac, 1 A at 12 V, 12 watt
Size	Rackmount: 17" w x 14.5" d x 5.5" h (43 x 37 x 14 cm)
Weight	14.7 lb (6.7 kg)
Data Outputs	RS232, 0-2.5 V Analog, optional 4-20 mA Analog, optional USB adapter
Data Transfer Baud Rates	2400, 4800, 19200
Output Ranges	User-Defined Scaling Factor in Menu
DewLine™	Yes
Long-Life Pump	Yes, 20,000 hr
Flow Meter	Yes
Options	Battery; External Particle Filter; Bluetooth; External Serial-to-USB Adapter; 4-20 mA Current Output; Lamp Heater; High-Altitude Upgrade (pressure sensor)