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METLAB
METLAB C14G2 biogenic CO₂ sampler — perspective view of the wall-mounted enclosure with the door visible and the front display lit.
New · ISO 13833:2013

Biogenic CO2 sampling, built for EU ETS compliance.

The METLAB C14G2 is an ISO 13833:2013 flow-proportional sampler that stays precise even under the most variable flue gas conditions. Pair it with our sampling services, 14C analysis and reporting — and go from zero to full compliance with one partner. Available in all EU countries.

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  • 60 years of emission measurement
  • ISO/IEC 17025:2018 accredited
  • 10+ years of Biogenic CO2 sampling according to ISO 13833:2013

One partner, from sampling probe to final report

Reporting biogenic CO2 under the EU ETS rests on two things: sampling carried out according to ISO 13833, and 14C analysis from an accredited laboratory. The analysis requirement is fixed; the sampling has to be done right. METLAB covers both — and our accreditation is the reason a customer can trust we do the sampling to standard.

The METLAB team — emission-measurement specialists and instrument engineers, photographed at the Enköping office.
Get in touch with one of our specialists.
01

The full chain, one supplier

Sampler, on-site installation, ISO 13833 sampling, 14C analysis through an accredited laboratory, performance evaluation, and the final report — handled under one contract.

02

A decade of ISO 13833 sampling

First permanent installation live since 2015, running continuously — among the longest ISO 13833 biogenic CO2 sampling track records in Europe.

03

Accredited lab and sampler manufacturer

Sweden's first air laboratory, founded 1965. Accredited to ISO/IEC 17025:2018 for emission measurements and calibrations. We design and build the C14G2 ourselves — the lab uses the instruments, and field use refines them.

Whether you operate the C14G2 yourself or hand the whole programme to METLAB, the 14C result is analysed by an accredited laboratory and the sampling behind it is done to ISO 13833.

The instrument

Precision CO2 sampling, engineered for industrial duty

The METLAB C14G2 captures CO2 in liquid absorbent under flow-proportional control, per EN-ISO 13833:2013. It is built for permanent installation in WtE stacks and for emissions laboratories that run sampling campaigns at multiple sites.

METLAB C14G2 biogenic CO₂ sampler — front view with the door visible and the front display lit.

  • Proven track record

    A third-generation design, refined over ten years of accredited measurements to ISO 13833:2013.

  • Easy and reliable absorbent system

    4M NaOH absorbent delivers uniform gas contact across the full sampling period. No channeling, no uneven saturation, and a sample exchange that can be performed safely with minimal training.

  • Real-time leak detection

    The C14G2 measures O2 downstream of the absorbent continuously. Comparing it to the stack CEMS O2 flags any air ingress in real time, so leaks are detected and expensive invalidated samples are avoided.

  • Precise proportional sampling

    Sample flow is regulated against the plant's CEMS flow signal directly over 4–20 mA. Proportionality is maintained well within standard requirements, even under variable gas-flow conditions.

  • Full remote control

    Operational parameters are accessible from the control room, including remote start and stop of sampling.

  • Compact, wall-mountable

    560 × 500 × 300 mm at 17 kg — small enough to wall-mount in a stack corridor without dedicated floor space.

Two C14G2 samplers installed side by side at a European Waste-to-Energy plant — wall-mounted in a compact configuration covering two parallel stack lines.
Installation in two lines at a European Waste-to-Energy plant — demonstrating the compact footprint of the sampler.

How it works

Two ways to install it — your choice

Flue gas is drawn from the stack, conditioned to remove moisture, and proportioned to the C14G2 where CO2 is captured in 4M NaOH absorbent at approximately 5 mL/min, proportional to flue gas flow. The plant's CEMS provides the flow reference. There are two common ways to plumb this in — pick the one that fits your facility.

A · Standard

Standard — independent sample train

Schematic of the standard installation: flue gas drawn from the stack through sampling probe, heated line, gas conditioner, pump with bypass valve, and gas inlet into the C14G2 sampler, with signal I/O and exhaust outputs.
A
Sampling probe
B
Heated line
C
Gas conditioner
D
Pump
E
Bypass valve (included)
F
Gas inlet
G
C14G2 sampler
H
Signal I/O
I
Exhaust

When to choose this. The default option for new installations and for plants that want the CO2 sampler to run independently of CEMS uptime. Full control over sample conditioning and continuity. On the downside, it requires a larger investment than the optional method.

B · Optional

Optional — downstream of existing CEMS

Schematic of the alternate installation downstream of an existing CEMS: flue gas drawn through sampling probe and heated line into the existing CEMS, with a passive conditioner sidestream feeding the C14G2 sampler.
A
Sampling probe
B
Heated line
C
Existing CEMS
D
Gas conditioner (passive)
E
C14G2 sampler
F
Signal I/O
G
Exhaust

When to choose this. The lowest-cost configuration where the plant already runs a CEMS that delivers a dry, unaltered sample stream. Trade-off: sample continuity is tied to CEMS uptime, so any CEMS maintenance or fault pauses the biogenic-CO2 campaign as well.

Either way, the sampler captures the same way and reports the same way. METLAB engineers can advise on the right choice for your stack configuration during the quote stage.

In the field

Field data from a Waste-to-Energy plant

The charts below are taken from a METLAB sampling report for a WtE installation, covering one month of the C14G2 running against the plant's CEMS. They illustrate the two things that determine whether a biogenic CO2 campaign is defensible: proportionality under variable stack conditions, and leak integrity across the whole campaign.

Time-series chart showing C14G2 sample flow (green) closely tracking flue gas flow (black) over the full sampling campaign.
Chart 1 · Proportionality Sample flow (green) tracks flue gas flow (black) across the campaign. Even under the most variable stack conditions, the sample remains a true reflection of the plant's actual emissions — not a fixed-rate snapshot.
Time-series chart showing the C14G2 sampler O₂ closely tracking the stack CEMS O₂ across the campaign, with no divergence visible.
Chart 2 · Leak integrity Sampler O2 tracks the stack CEMS O2 throughout the campaign. Any divergence flags an air leak in real time — well before the absorbent is shipped to the lab. The signal is exposed on the display and as a 4–20 mA output.

Both signals are available continuously. If something goes wrong, you find out in hours — not when the lab report arrives.

Specification

Built-to-spec, top to bottom

Description Specification
Dimensions (W × H × D)560 × 500 × 300 mm (excl. wall-mount)
Weight17 kg
Operating temperature0…+30 °C
Storage temperature−20 °C…+50 °C
Transport temperature−20 °C…+50 °C
Relative humidity20…90 %
Altitude−300…2000 m
Power100–240 V, 50/60 Hz, 1 A, Category II
Gas connectionsSwagelok 6 mm compression fittings
Input signals (4–20 mA)Stack O2; flue gas flow
Output signals (4–20 mA)Leak detection O2; sampling rate
Remote on/offRelay

Mounting. Available wall-mount (configurations A or B, C-C dimensions on request) or with rubber feet + carrying handle for portable use. Standard 2 m power cable with CEE 7/4 (“Schuko”, Type F) plug; open-end termination available on request.

Download the full data sheet (PDF)

Two ways to engage

Buy the instrument, or hand us the whole job

Option 1

C14G2 sampler

For operators and integrators who run their own sampling campaigns.

  • C14G2 sampler unit
  • Absorbent preparation instructions
  • Sampling protocols
  • Data handling guidance
  • Optional installation support
Get a quote
Option 2 · Turn-key

Full-service sampling & reporting

For operators who want EU ETS compliance delivered turn-key.

  • 4M NaOH absorbent prepared in our CO2-free laboratory, delivered to site, and collected after sampling
  • Absorbent installation by METLAB — or by your local staff after training
  • On-site installation of the sampler
  • Continuous sampling, typically one-month campaigns
  • 14C radiocarbon analysis through an accredited laboratory
  • Sampling performance evaluation
  • Complete reporting
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The full-service workflow

  1. 1

    Absorbent preparation

  2. 2

    Absorbent installation

  3. 3

    CO2 sampling (continuous, typically 1 month)

  4. 4

    Absorbent collection

  5. 5

    Sample handling and 14C analysis

  6. 6

    Reporting (biogenic / fossil fraction + sampling evaluation)

Absorbent handled safely, end to end

Prepared in the lab, ready to install

The C14G2 captures CO2 in a 4M NaOH solution, and the quality of that solution sets the quality of the result. METLAB's laboratory prepares it carbonate-free, so the only carbon the absorbent carries to the lab is the carbon sampled from the stack.

The prepared absorbent ships in custom heavy-duty transport cases — foam-seated, sealed, and rated for long-distance transport. The same cases carry the exposed absorbent back for 14C analysis. Preparation, transport, and return stay within one controlled chain, with no carbonate contamination introduced between the lab and the stack.

METLAB absorbent transport case — foam-seated bottles of 4M NaOH absorbent in a sealed transit case.

Trusted by some of Europe's largest Waste-to-Energy plants for biogenic CO2 monitoring compliance.

Current active markets include Sweden, Denmark, Norway, and Italy.

Customer references available on request — ask via the form below.

Frequently asked

Common questions

Is the C14G2 compliant with the EU ETS measurement requirements for biogenic CO2?

Yes. It implements EN-ISO 13833:2013 — the radiocarbon (14C) method recognized for separating biogenic from fossil CO2 in flue gas, which is the method referenced by the EU MRR framework for WtE.

How long is a typical sampling campaign?

One month of continuous sampling is the standard duration. Shorter or longer campaigns are possible depending on what your regulator requires.

Can the C14G2 be integrated with our existing CEMS?

Yes. 4–20 mA inputs accept stack O2 and flue gas flow signals from the CEMS, and the sampler can optionally be installed downstream of the CEMS outlet if the stream is dry and unaltered.

What happens if there's an air leak during sampling?

The C14G2 monitors its own O2 against the CEMS O2 continuously. Any divergence is visible on the touchscreen and on a 4–20 mA output, so leaks are detected in hours — not weeks.

Who performs the 14C analysis under the full-service option?

An accredited radiocarbon laboratory partner. METLAB handles sample preparation, splitting, dispatch, evaluation and the final report.

What's the lead time?

On request via the contact form — depends on configuration and current queue.

Can you provide customer references?

Yes, on request. Submit the form and tick “Request customer references” and we'll connect you with a relevant reference plant.

Contact

Talk to us about your EU ETS plan

Tell us about your plant and what you need — equipment, full-service sampling, analysis, or all three. A METLAB engineer will be in touch within two working days.

Interest (select any that apply)

Response within two working days.