October 28, 2014 

MEMORANDUM 

SUBJECT: Modern O3 Instrument Deployment Data 

FROM: Russell W. Long (U.S. EPA, ORD, NERL) 

TO: O3 NAAQS Review Docket, EPA-HQ-OAR-2008-0699. 

The 5-year review cycle of the NAAQS for criteria air pollutants requires review of existing 

monitoring methods to determine if they provide sufficient measurement accuracy, precision, 

specificity, and minimal measurement uncertainty to provide data suitable for protecting public 

health and to support exposure and health studies. Currently, nearly all compliance monitoring

in the U.S. is carried out with UV absorption Federal Equivalent Method (FEM) analyzers.

This document contains performance specifications and deployment information for existing and 

potential Federal Reference Methods (FRMs) and FEMs for determination of ozone in ambient air. 
Company 2-B 

Technologies

2-B 

Technologies

2-B 

Technologies

DKK-TOA Corp Ecotech MonitorLabs/Lear 

Siegler

Opsis

Performance 

Parameters

Model 2021 Model 2051 Model 2B 2111 Model 1003-AH

Model 1003-PC 

Model 1003-RS

Model 1008-AH 

Model1008-PC 

Model 1008-RS

Model 

GUX-313E 1

Model 

Serinus 101

Model

 O342M1

Model

SANOA1

Model

APOA-360

APOA-360-CE

Model

APOA-3701 

Model 8810 Model AR-500 

System 3001

FEM

Designation # 

(original)

EQOA-0410-1904 EQOA-0410-1904 EQOA-0514-215 EQOA-0577-0194 EQOA-0383-0564 EQOA-1107-169 EQOA-0809-1874 EQOA-0206-148 EQOA-0400-137 EQOA-0196-1124 EQOA-0506-1604 EQOA-0881-0534 EQOA-0495-103

FEM Designation 

Date (original)

4/27/2010 4/27/2010 6/18/2014 6/3/1977 3/10/1983 11/8/2007 7/31/2009 6/24/2002 5/8/2000 3/20/1996 5/1/2006 10/26/1981 5/2/1995

# Network/2014 4 0 16 7 0 3 0 0 2 6 1 0

% of Network 0.31% 0.00% 1.23% 0.54% 0.00% 0.23% 0.00% 0.00% 0.15% 0.46% 0.08% 0.00%

Measurement 

Principle

UV Absorption at 

254 nm

UV Absorption at 

254 nm; Dual 

Beam 

UV Absorption at 

254 nm; Dual Beam

UV absorption UV absorption UV absorption 

photometry

non-dispersive UV 

absorption 

UV absorption UV/Vis 

differential 

optical 

absorption 

spectrometry

non-dispersive UV 

absorption 

 differential 

optical absorption 

spectrometry

Range(s) 0-0.5 ppm 

(Designation 

description)

0.0015 ppm - 250 

ppm 

0-0.5 ppm 

(Designation 

description)

0.0015 ppm - 250 

ppm 

0.0005 ppm to 2.0 

ppm

0-0.5 ppm 

0-1.0 ppm 

(designation 

description)

0-0.5 ppm

0-1.0 ppm 

(designation 

description)

0-0.1 ppm

0-0.2 ppm 

0-0.5 ppm

(designation 

description)

0-1 ppm

Autoranging 0-20 

ppm 

(Analogue ranges 0-

0.050 ppm to 0-20 

ppm)

0-0.1 ppm

0-0.2 ppm 

0-0.5 ppm

0-1.0 ppm

0-2.0 ppm

0-5.0 ppm

0-10.0 ppm

or user selectable 

ranges

0-0.5 ppm

(designation 

description)

0-0.5 ppm

(designation 

description)

0-0.1 ppm

0-0.2 ppm

0-0.5 ppm

0-1.0 ppm

4 ranges selectable 

from 0-10 ppm, 

within 10 times 

range ratio

0-0.5 ppm

0-1.0 ppm

(designation 

description)

0-0.5 ppm

(designation 

description)

Noise Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 3 < 0.00025 ppm Footnote 3 Footnote 3

Lower detectable 

limit

0.003 ppm 0.002 ppm 0.001 ppm Footnote 3 Footnote 3 0.0005 ppm < 0.0005 ppm 0.4 ppb 0.0005 ppm 0.0005 ppm ≤1%

Interferents Footnote 2 Footnote 2 Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 2 Footnote 2 Footnote 2

Zero drift <0.002 ppm/day

<0.005ppm/year

<0.001 ppm/day

<0.003 ppm/year

<0.001 ppm/day<3 

ppb/year

Footnote 3 Footnote 3 Within 0.001 

ppm/24 hours

<0.0003 ppm/ 24 h

<0.0003 ppm/ 7 

days

less than 0.5 ppb / 

24 h less than 1 ppb 

/ 7 days 

< LDL/day at 

lowest range

< LDL/week at 

lowest range

< LDL/day at lowest 

range

< LDL/week at 

lowest range

≤2%/ 24 hrs

≤ 5% of limit 

value/30days

Modern O3 Instrument deployment and Performance Data

Office of Research and Development

October 2014

Dasibi Environnement SA Horiba
Company 2-B 

Technologies

2-B 

Technologies

2-B 

Technologies

DKK-TOA Corp Ecotech MonitorLabs/Lear 

Siegler

Dasibi Environnement SA Horiba Opsis

Span drift <1% /day <3%/year Footnote 3 Footnote 3 Within ± 1% FS/ 

24 hours

0.1% of reading/ 24 

hours

0.0005 ppm or 

<0.5% of reading/ 7 

days

less than 0.5 % / 24 

h less than 1 % 

< LDL/day at 

lowest range

< LDL/week at 

lowest range

< LDL/day at lowest 

range

< LDL/week at 

lowest range

≤2%/ 24 hrs

≤ 5% of limit 

value/30days

Lag time Footnote 3 Footnote 3 2 s Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 3

Rise time 

(response)

20 s, 2 points 4 s, 2 points 4 s Footnote 3 Footnote 3 Footnote 3 30 s to 95% Automatic & 

programmable

Min 20 sec

Within 75 s st 

lowest range

Within 75 s st 

lowest range

≤ 60s

Fall time Footnote 3 Footnote 3 4 s Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 3 Footnote 3

Precision Greater of 0.0015 

ppm or 2 % of 

reading

Greater of 0.001 

ppm or 2% of 

reading for 10 s 

average

Greater of 0.5 ppb 

or 1% of reading for 

10-s average

Footnote 3 Footnote 3 Footnote 3 0.0005 ppm at 

<0.100 ppm; 

Otherwise 0.2% of 

reading

Footnote 3 ± 1.0% of FS

Information 

Source

(unless footnoted)

twobtech.com web 

site

twobtech.com web 

site

twobtech.com web 

site

Company no longer 

exists

Company no longer 

exists

DKKTOA.com 

web site

ECOTECH web site Environnement SA 

web site

Specs not on web 

site

found some info at 

meteotech.co.il 

site

Horiba.com web site Sira Product 

Conformity 

Certificate; not on 

web site

1 EPA-designated 

FEM

2 Interferences tested according to 40 CFR Part 53

3

 Test informaiton included in FEM application 

4

 In Network
Company 

Performance 

Parameters

FEM

Designation # 

(original)

FEM Designation 

Date (original)

# Network/2014

% of Network

Measurement 

Principle

Range(s)

Noise

Lower detectable 

limit

Interferents

Zero drift

Office of Research and Development

October 2014

Seres SIR SA Tanabyte Thermo Electron

Thermo 

Environmental 

Model OZ-2000G1 Model 

S-50141

Models

722, 723,724, 

725, 726

Models 400E, 

T400

Models 400, 

400A

Model 

TML-10

Models

T265

Models

265E

Models 

ML9810/CM2010/EC9

812

ML9810B/CM2010B

Model 1010 

Ecotech Models 

EC9810AA

EC9810BB

EC9811C

Models 

ML9810B/CM2010B

Models 49a, 49Cb, 49iC

EQOA-0506-161 EQOA-0207-164 EQOA-0407-165 EQOA-0992-0874 EQOA-0992-

0874

EQOA-0992-

0874

EQOA-0611-

199

EQOA-0611-199 EQOA-0193-0914 EQOA-0193-0914 EQOA-0193-0914 EQOA-0880-0474

5/1/2006 2/28/2007 4/26/2007 9/12/2002

Mod 8/2010

6/11/1998

Mod 8/2010

9/28/1992

Mod 8/2010

10/7/2011

Mod 10/2012

10/7/2011

Mod 10/2012

2/3/1993

Mod 3/2011

2/3/1993

Mod 3/2011

2/3/1993

Mod 3/2011

8/27/1980 Total in 

Network

0 0 0 630 2 9 620 1300

0.00% 0.00% 0.00% 48% 0.15% 0.69% 48%

UV absorption UV absorption UV absorption UV absorption chemilumin

escence

chemiluminesc

ence

UV photometry UV photometry UV photometry UV photometry

0.1 -0.5-1 -5 and 10 

ppm

0-.05, .5, 1.0 ppm 0-0.5 ppm

0-1.0 ppm

(designation 

description)

100-10000 ppb

0-0.1 ppm to 0-10 

ppm, user 

selectable; Dual 

ranges and autoranging supported

0-0.1 ppm

0-1.0 ppm

(designation 

description)

0-0.1 ppm

0-1.0 ppm

(designation 

description)

0-0.1 ppm to 

0-2 ppm, 

user 

selectable; 

auto-ranging 

supported

0-0.1 ppm to 0-2 

ppm, user 

selectable; autoranging 

supported

0-0.05 ppm

0-1.0 ppm

(designation 

description)

0-20 ppm

0-0.05 ppm (A,B)

0-20 ppm (A,B,C)

a=0.5; 0-1.0b,

c=0-0.05 to 200 ppm

0-0.1 to 400 mg/m3

< 0.0005 ppm Zero Noise:

< 0.0003 ppm

Span Noise: <0.5 

% of reading 

(above 0.1 ppm)

Zero Noise:

< 0.003 ppm 

(RMS)

Span Noise:

<0.5% of reading 

RMS above 0.1 

ppm

Zero Noise:

< 0.003 ppm 

(RMS)

Span Noise:

<0.5% of 

reading RMS 

above 0.1 ppm

Zero Noise:

< 0.00015 

ppm

Span Noise:

<0.5% or 

reading 

above 0.1 

ppm

Zero Noise:

< 0.0003 ppm

< 0.00025 ppm with 

Kalman filter active

<0.00025 ppm or 0.1% 

of reading RMS 

whichever is greater, 

with Kalman filter 

active (A,C)

<0.0002 ppm RMS with 

Kalman Filter active (B)

b=0.0005 ppm RMS

c=Zero Noise: 0.25 ppb 

RMS (60 s averaging 

time)

0.0006 ppm < 0.006 ppm 

(RMS)

< 0.006 ppm 

(RMS)

<0.0003 ppm 0.0006 ppm < 0.0005 ppm with 

Kalman filter active

0.0005 ppm with 

Kalman filter active(A,C)

0.4 ppb or 2% of 

readingwith Kalman 

filter active(B)

b=0.001 ppm

Footnote 2 Footnote 2 Footnote 2 Footnote 2 Footnote 2 Footnote 2

0 (digital output)

<0.0005 

ppm/month

<0.001 ppm per 

month

<0.001 ppm/24 h

<0.001 ppm/7 

days

<0.001 ppm/24 

h

<0.001 ppm/7 

days

< 0.0005 

ppm/24 h

< 0.001 ppm/24 

h

24 hours: < 0.001 ppm

30 days: < 0.001 ppm

b,c= <0.001 ppm/24 

hour

Teledyne-Monitor/ Casella/Ecotech Labs/Weddin & 

Associates

Modern O3 Instrument deployment and Performance Data

Teledyne API

Teledyne Monitor
Company 

Span drift

Lag time

Rise time 

(response)

Fall time

Precision

Information 

Source

(unless footnoted)

1 EPA-designated 

FEM

2 Interferences tested according to 40 CFR Part 53

3

 Test informaiton included in FEM application 

4

 In Network

Seres SIR SA Tanabyte Thermo Electron

Thermo 

Environmental 

Teledyne-Monitor/ Casella/Ecotech Labs/Weddin & 

Associates

Teledyne API

Teledyne Monitor

0 (digital output)

<0.0005 

ppm/month

± 1% per month < 1% of reading/

7 days

< 1% of 

reading/

7 days

<0.5%of full 

scale/24 hrs

The greater of 

(<1% of reading/ 

or 0.001 ppm)/24 

h

24 hours: < 0.0005% 

ppm

30 days: < 0.0005% 

ppm

b,c=<1% full 

scale/month

15 sec 10 sec 10 sec <10 sec <10 sec b,c=10 s

30 sec

(90% FS)

20 sec <20 seconds to 

95%

<20 seconds to 

95%

<20 seconds 

to 95%

<20 seconds to 

95%

b,c=20 s

30 sec

(90% FS)

20 sec <20 seconds to 

95%

<20 seconds to 

95%

<20 seconds 

to 95%

<20 seconds to 

95%

< 0.001 ppm <0.5 % of reading <0.5% of reading 0.5% of reading <0.5% of 

reading

b,c=0.001 ppm

Seres website SIR SA web site tanabyte.com for 

all models except 

722

Teledyne-api web 

site

Teledyne-api 

web site 

Instruction 

Manual 400A

No details on 

TML-10 on 

web site

Teledyne-api 

web site

Teledyne-api 

web site

ECOTECH web site ECOTECH web site Thermo web site; 

Model 49C Manual;