Protir 204M - Protea Ltd

The 204M is a transportable CEM based on FTIR technology. It is MCERTS approved and used by stack testing organisations and laboratories for compliance and BS EN 14181 emissions monitoring. Using the 204M for measurements of waste incineration and combustion plant process is as simple using an FTIR can be. With pre-loaded calibration methods for 28 gas species, automatic nitrogen purging, in-built pressure and temperature alarms, analogue and digital I/O it is a complete site-ready back up CEM.

The ProtIR 204M and PAS software have been designed to allow stack emission monitoring to be carried out to the Environment Agency’s Technical Guidance Note M22 Measuring stack gas emissions using FTIR instruments (TGN M22) as simply and quickly as possible. With the built-in Standard Analysis Model for common gases there is no complex set-up of analysis required. The software as built-in calculations for drift and residual analysis, following the methods described in TGN M22.

Skilled users of the FTIR can use the chemometric building routines of the PAS software to build analytical methods for specific applications. Set up this way, the 204M can measure thousands of possible gas species over ranges from ppm to %Vol.

MCERTS

The only gas analyser specifically tested as a transportable CEM, the 204M has passed the Environment Agencies MCERTS test programme for use on waste incineration processes. This allows the instrument to be used by stack testing organisations with guarantees on quality of product build and on analytical accuracy.

Component	Standard Range / mg/m3	Extended Range / mg/m3*	Lower Detection Limit (LDL) / mg/m3**
CO	0 - 75 mCerts	0 - 18750	0.2
NO	0 - 200 mCerts	0 - 2000	0.9
NO₂	0 - 200	0 - 2000	0.3
N₂O	0 - 100	0 - 1000	0.2
SO₂	0 - 75 mCerts	0 - 30000	0.8
NH₃	0 - 15 mCerts	-	0.1
HCl	0 - 15 mCerts	0 - 4000	0.3
HF	0 - 15	0 - 70	0.1
HBr	0 - 200	-	1.8
CH4 (Methane)	0 - 70	0 - 700	0.2
C₂H₆ (Ethane)	0 - 50	0 - 1400	0.4
C₃H₈ (Propane)	0 - 50	0 - 2000	0.3
C₄H₁₀ (n-Butane)	0 - 50	0 - 300	0.9
C₆H₁₄ (n-Hexane)	0 - 50	0 - 400	0.9
C₂H₄ (Ethene)	0 - 25	0 - 1250	0.3
CH₃OH (Methanol)	0 - 70	-	0.4
HCHO (Formaldehyde)	0 - 20	-	0.3
C₆H₆ (Benzene)	0 - 250	-	3.4
C₆H₆O (Phenol)	0 - 100	-	0.4
HCN	0 - 15	0 - 600	0.2
CCl₄	0 - 200	0 - 1400	3.0
CS₂	0 - 100	0 - 400	0.4
COS	0 - 50	-	0.05
CF₄	0 - 40	0 - 600	0.05
SF₆	0 - 65	-	0.05
TOC (Indication only)	0 - 50	0 - 2000	0.4
H₂O	0 - 40%mCerts	-	<1000ppm
CO₂	0 - 20%	0 - 60%	<2 ppm
O₂ (via zirconia sensor)	0 - 20.9%mCerts	N/A	<0.4%

Zirconia Sensor

The 204M analyser contains an integrated ZrO₂ or Lambda sensor. For emissions compliance monitoring there is always the requirement to measure oxygen for correction and reporting of results. Often this requires a separate oxygen analyser, which will need extra sample conditioning. The ZrO₂ sensor is a hot, wet sensor built into the same gas sample path that the FTIR multi-gas analyser is measuring. This enables a real-time oxygen measurement to be made alongside the standard gas measurements of CO, NO, SO₂ etc.

The ZrO₂ is calibrated once on start-up of the analyser using ambient air as a span gas. The calibration is made using a built-in calibration wizard in the FTIR software:

In-built Dilution

The 204M gas analyser can be supplied with a built-in mass flow controller (MFC) that is controlled by the PAS software. This MFC is controlled to allow a precise amount of dilution gas to pass into the measurement stream, often at the sample probe. By diluting the sample accurately, this allows the 204M to measure much higher gas concentrations than would otherwise be possible with the analyser.