Description 

Features

•	 Automatic quality assurance, alarms, and control features

•	 Gas phase calibration not required

•	 Identification and measurement of as many as 23 elements 

simultaneously (refer to the periodic table on the Elements 

Supported page of this data sheet)

•	 Internal calibration check incorporated with every sample analyzed

•	 Proven RTR/XRF technology demonstrated on the ocean floor, Mars,

and in thousands of beta attenuation monitors

•	 Daily, automatic upscale, blank, and flow checks

•	 Recognized by the EPA as an innovative clean air technology (Clean

Air Excellence Award, 2007)

•	 Sampling, analysis, and near-real-time reporting (every 15, 30, 60

and 120 minutes)

CES’Xact 640 system uses reel-to-reel (RTR) filter tape sampling and

nondestructive X-ray fluorescence (XRF) analysis to monitor stack

metal emissions. An isokinetic sub-sample of stack gas is taken from

the stilling chamber and drawn through a chemically reactive filter

tape. Vapor phase metals, including mercury (Hg), are deposited along

with the particulate matter (PM) on the filter tape.

The deposit is automatically advanced and analyzed by XRF for 

selected metals as the next sample is being collected. Sampling and

analysis are performed continuously and simultaneously, except 

during advancement of the tape (~20 sec) and during daily-automated

quality assurance checks.

In 2007, through its Clean Air Excellence Award, the EPA recognized

the Xact 640 CEMS as an outstanding achievement in innovative

clean air technology. The EPA also approved the Xact 640 CEMS as an 

alternative method for periodic Method 29 testing and feed stream

analysis, as well as for monitoring emissions during plant operation.

1 | www.cooperenvironmental.com

XactTM 640 Monitoring System

Multi-Metals Continuous Emissions 

Monitoring System (CEMS)
Measurement method. . . . . . . . . . . . . . . . . . 

Key applicable elements. . . . . . . . . . . . . . . . .

Measurement range. . . . . . . . . . . . . . . . . . . . .

Detection limits (IF, EPA IO 3.3)3. . . . . . . . .

Sampling and analysis times. . . . . . . . . . . . .

Calibration stability check frequency. . . .

Estimated recalibration frequency. . . . . . .

Sample flow rate. . . . . . . . . . . . . . . . . . . . . . . .

Linearity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Required operating environment. . . . . . . .

Power requirements4. . . . . . . . . . . . . . . . . . . .

Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Based on EPA Method IO 3.3: Determination of Metals in Ambient PM Using XRF

Sb, As, Ba, Cd, Cr, Co, Cu, Fe, Pb, Hg, Mn, Ni, Se, Ag, Sn, Tl, V, Zn, and more

available

Demonstrated up to 1963 μg/dscm

Metal and sample time dependent; refer to the minimum detection limit

(MDL) data

Every 15, 30, 60, 120 minutes, depending on the per sample mass

Automatically with each sample analyzed

Annually, when manufacturer’s operating recommendations are

followed

1.051pm

Correlation coefficient >0.98

Lab environment with temperature controlled to 20±3°C (68°F)

120 VAC/60 Hz @ 2-20 amp circuits

220 VAC/60 Hz 20 amp with an optional power converter

Modbus ASCII protocol

All metals that the system is calibrated to measure will be reported

Change or add elements

Enclosures

Remote control

Remote polling

Specifications

•	 Single monitor platform for Hg and HAP metals monitor compliance

•	 No PM monitor needed to comply with Mercury & Air Toxics (MATS) rule for power plants

•	 May be used to meet 40 CFR Part 60 and 63 regulations

•	 Measures total elemental, oxidized, and particulate mercury in μg/dscm

•	 Multi-metal analysis reduces expenses, time, and resources

•	 Non-destructive analysis allows for sample archiving

•	 Sensitive and reliable (ng/m3 to μg/m3 range)

Benefits

Applications

The Xact 640 monitoring system can simultaneously identify and measure multiple metals in flue gas to provide

data for use in the following applications.

•	 Hg CEMS

•	 HAP metals CEMS

•	 Baselining a new process

•	 Optimization of emission controls

•	 Permitting

•	 Regulatory compliance

•	 Risk management

2 | 3 Detection limits are determined using 95% confidence interference-free data. 4 Power must be conditioned to maintain a factory warranty or service agreement.
Sampling Time (min)

	 	 15	 30 60 120

Performance 

Cr

Mn

Fe

Co

Ni

Cu

Zn

Ga

Ge

As

Se

Ag

Cd

In

Sn

Sb

Ba

Hg

Tl

Pb

Bi

24

25

26

27

28

29

30

31

32

33

34

47

48

49

50

51

56

80

81

82

83

0.14

0.14

0.38

0.16

0.11

0.13

0.12

0.05

0.06

0.06

0.07

2.17

2.88

3.39

3.74

0.33

0.47

0.09

0.09

0.11

0.12 

0.05

0.05

0.13

0.06

0.04

0.05

0.04

0.02

0.02

0.02

0.02

0.77

1.02

1.20

1.32

0.12

0.17

0.03

0.03

0.04

0.04

0.018

0.018

0.048

0.020

0.014

0.017

0.014

0.007

0.008

0.007

0.009

0.271

0.360

0.424

0.467

0.042

0.059

0.012

0.012

0.014

0.015

0.006

0.006

0.017

0.007

0.005

0.006

0.005

0.002

0.003

0.003

0.003

0.096

0.127

0.150

0.165

0.015

0.021

0.004

0.004

0.005

0.005

Minimum Detection Limits (μg/dscm)

Element Atomic Number

3 |

Interference Free, 1 Sigma
Elements Supported 

Ordering Information

Xact 640 monitoring systems identify and measure the 63 elements highlighted in the table below. Minimum

detection limits (MDLs) for the elements highlighted in blue can be found on the Performance page of this

data sheet. The system is capable of measuring the elements highlighted in dark gray, but MDLs have not been

developed.

To place an order or for more information about the Xact 640 continuous emissions monitoring system,

contact your regional CES representative or email us at info@cooperenvironmental.com

Cooper Environmental Services, LLC

9403 SW Nimbus Ave.

Beaverton, OR 97008

T: 503-670-8127 F: 503-624-2120

www.cooperenvironmental.com

4 |

Be C

Mg

Ca

Sr

Ba

Ra

H

Li

Na

K

Rb

Cs

Fr

Hf

Rf

Ti

Zr

Sc

Y

*

**

V

Nb

Ta

Ha

Os

Hs

Fe

Ru

Re

Bh

Cr Mn

Mo

W

Sg

Co

Rh

Ir

Mt

Hg

Uub

Zn

Cd

Cu

Ag

Au

Rg

Ni

Pd

Pt

Ds

Ga

In

Tl

Uut

Bi

Uup Uuh Uus Uuo

Ge

Sn

As

Sb

Pb

Uuq

At

Se

Te

Br

I Xe

La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Rn

Kr

Al Si P S Cl Ar

B C N O F Ne

He

Po

Tc

* Lanthanide Series 

** Actinide Series