Measurement Principle

UV Absorption at 254 nm; Dual Beam

Federal Equivalent Method (FEM)

Yes, EQOA-0410-190

Linear Dynamic Range

0 to 250 ppm

Resolution

0.1 ppb

Precision (1σ; rms noise)

Greater of 1.0 ppb or 2% of reading for 10-s average

Accuracy

Greater of 1.0 ppb or 2% of reading

Limit of Detection (2σ)

2.0 ppb for 10-s average

NIST-Traceable Calibration

Yes

Measurement Interval

2 s (Data averaging options: 10 s, 1 min, 5 min, 1 hr)

Flow Rate (nominal)

~1.8 Liter/min

Flow Rate Requirement

>1.2 L/min

Baseline Drift

<1 ppb/day; <3 ppb/year

Sensitivity Drift

<1%/day; <3%/year

Measurement Time, Frequency

2 s, 0.5 Hz

Response Time, * of Step Change

4 s, 2 points

Measurement and Averaging Times

2 s, 10 s, 1 min, 5 min, 1 hr

Internal Data Storage

16,383 lines (10 s avg. = 1.9 days; 5 min avg = 1.9 mo.)

Ozone Units

ppb, pphm, ppm, µg m-3, mg m-3

Pressure Units

mbar, torr

Temperature Units

°C, K

T and P Corrected

Yes

Operating Temperature Range

0 to 50 °C; -20 to 50 °C with low temperature modifications (rotary vane pump and lamp heater)