In stock
- Installation & training on-site setup, gas connection and operator onboarding
- Method + calibration a Dumas SOP and protein factors set up on your samples
ELTRA ELEMENTRAC CN-r Carbon/Nitrogen Dumas Analyzer – Protein & Nitrogen | Food, Feed & Soil
Automated Dumas analyzer for nitrogen / protein and carbon — reliable results in under three minutes with interleave processing, over 70× faster than Kjeldahl, on any solid or liquid matrix.
- ✔ Dumas nitrogen / protein + carbon · validated by AOAC, ISO, DIN, AOCS, OIV
- ✔ < 3 min · interleave analysis · TCD (N) + NDIR (C)
- ✔ Integrated PC + touchscreen · FDA 21 CFR Part 11 · CN-r or N-r
- ✔ Lead time: configured to order — request current timeline
What your QC lab actually checks
Dumas protein and nitrogen, fast
Automated total nitrogen, protein and carbon determination by the Dumas method — validated by AOAC, AACC, ISO, DIN, ASBC, AOCS and OIV. Interleave processing combusts the current sample while analyzing the previous one, so results come in under three minutes, over 70× faster than Kjeldahl and with no hazardous acids. It handles any matrix, solid or liquid, up to 1 g, at a low cost per sample.
An applications engineer on the line
Dumas calibration, protein-factor setup and blank control from engineers who run materials characterization in-house. Sub-4h reply, NDA on request.
The ELTRA ELEMENTRAC CN-r is an automated Dumas analyzer for nitrogen / protein and carbon determination. It delivers reliable results in under three minutes at a low cost per sample, using interleave analysis — combustion of the current sample runs while the previous one is being measured. A modern, space-saving alternative to Kjeldahl (results over 70× faster), it has an integrated PC with tiltable touchscreen and FDA 21 CFR Part 11-compliant software, and is available as a carbon-and-nitrogen (CN-r) or nitrogen-only (N-r) analyzer.
Why food, feed and agriculture labs choose the CN-r
Dumas nitrogen, protein and carbon — fast, low-cost, high-throughput.
Dumas nitrogen, protein & carbon
Automated total nitrogen, protein and carbon determination by the Dumas method — internationally recognized and validated by AOAC, AACC, ISO, DIN, ASBC, AOCS and OIV.
Under 3 minutes, interleave
Intelligent interleave processing combusts the current sample while analyzing the previous one, giving results in less than three minutes — over 70× faster than Kjeldahl.
Any matrix, solid or liquid
Precise results across foods, feed, fertilizers, soil and fuels, on solid or liquid samples up to 1 g — with high-priority samples measured immediately, without re-sorting.
21 CFR Part 11, low cost per sample
FDA 21 CFR Part 11-compliant, network-capable ELEMENTS software; gas-saving functions and smart consumable use keep cost per sample low, with all consumables replaceable in under 20 minutes.
How Additive Plus supports it
A configured, installed analyzer with a Dumas method dialed in on your samples.
Configure to your samples
We spec the CN-r or N-r configuration, calibration standards and autoloader to your food, feed or soil matrices before it ships.
Install & train
Factory-trained engineers install the analyzer, connect oxygen, helium and air, and train your team on the ELEMENTS software.
Method & QC support
We help build the SOP — calibration, protein factor setup, blank control and a repeatable Dumas baseline for your standard.
What the CN-r measures
Full technical specifications are in the Specifications tab. Key measurement capability:
| Parameter | ELEMENTRAC CN-r |
|---|---|
| Measured | Nitrogen / protein and carbon (Dumas method) |
| Measurement ranges | Nitrogen 0.03–300 mg · carbon 0.02–175 mg |
| Detection | Thermal conductivity (N) · NDIR (C) |
| Sample weight | Up to 1.0 g (0.5 g nominal) · solid or liquid |
| Analysis time | < 3 minutes (interleave) |
| Requirements | Oxygen 99.999 % · helium 99.996 % · compressed air · PC/touchscreen integrated |
Typical sample materials
Protein and nitrogen in food, feed, fertilizers and soil.
Not sure the CN-r is the right analyzer?
Compare with other ELTRA elemental analyzers in our catalog.
Carbon / sulfurELEMENTRAC CS-rView analyzer →
C/H/SELEMENTRAC CHS-rView analyzer →
Why source the CN-r through Additive Plus
- Authorized channel for ELTRA / Verder Scientific lab equipment — sales, installation, training and service in one place.
- Configured to your samples — CN-r or N-r configuration, calibration and autoloader specified before shipping.
- Method development on your samples — Dumas calibration, protein factors and a repeatable SOP.
- <24h response from engineers who run materials characterization in-house. NDA on request.
| Brand | ELTRA |
| Model | ELEMENTRAC CN-r |
| Measurement ranges | Nitrogen: 0.03 mg to 300 mg Carbon: 0.02 mg to 175 mg |
| Typical weights | Up to 1.0 g, 0.5 g nominal |
| Analysis time | < 3 min |
| Detectors | Thermal conductivity detector (N) NDIR (C) |
| Typical samples | Food, feed stuff, fuels (coal and coke), environmental samples and fertilizers |
| Reagents | Magnesium perchlorate, sodium hydroxide, copper, aluminum oxide |
| Power supply | 230 VAC ±10%, 50/60 Hz |
| Required gas | Oxygen (99.999% purity) Helium (99.996% purity) Compressed air (oil and water free) |
| Configurations | CN-r, N-r |
| Weight | 135 kg |
| Dimensions | (W x H x D) 757 x 785 x 620 mm / 29.8 x 30.91 x 24.41 in |
Product videos
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- ✔ Lead time: configured to order — request current timeline
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Made to order
· Lead time: configured to order — request current timeline
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· Lead time: configured to order — request current timelineWhat our customers say
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Common questions
Don't see yours? Email [email protected] — NDA on request, typical reply within 4 hours.
What does the ELTRA ELEMENTRAC CN-r measure?
How does the Dumas method compare to Kjeldahl?
What samples can the CN-r handle?
How does interleave analysis speed things up?
Is the CN-r software compliant for regulated labs?
What does the CN-r need to run?
What is the lead time, and can Additive Plus set it up?
Place your order, or talk to an engineer first
Order ELTRA ELEMENTRAC CN-r Carbon/Nitrogen Dumas Analyzer – Protein & Nitrogen | Food, Feed & Soil direct, or talk to materials engineer