Metal Ions Analyzer, Nickel Analyzer

Metal Ions Analyzer

AAI’s metal ion analyzer continuously draws a liquid sample and outputs real-time concentrations of metal ions including copper, iron, nickel, chromium, and cobalt.

From mining to electroplating, a wide range of processes require online monitoring of metal ions in solution. The traditional lab method for measuring metal ions uses atomic absorption spectroscopy, which comes with slow results, expensive instrumentation, and human involvement.

The OMA system provides always-online analysis of trace-to-high metal ion concentrations at the site. This fully automated solution provides real-time response. The flexibility of full-spectrum analysis allows the user to add/ remove metal ion measurements or modify measurement ranges at any time.

  • Continuously measures metal ion concentrations using dispersive UV-Vis/SW-NIR spectroscopy
  • Totally solid state build with no moving parts — modern design for low maintenance
  • Ultra-safe fiber optic design with dedicated sample flow cell — no toxic/corrosive sample fluid in analyzer enclosure
  • Excellent dynamic range due to photodiode array — no error due to absorbance saturation
  • Decades of field-proven performance in industrial and environmental applications
  • Also available in portable suitcase version for analysis at multiple sites

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Available measurements:

  • copper ions
  • nickel ions
  • iron ions
  • cobalt ions
  • chromium ions

Metal Ions' Absorbance Spectra

To measure metal ions' concentrations, the OMA detects the distinctive absorbance curves of each measured metal and mathematically isolates this structure from the total sample absorbance. In accordance with Beer-Lambert Law, the OMA correlates the height of each curve directly to its corresponding real-time metal concentration.

Absorbance Curves: Chromium

Absorbance Curves: Chromium

Absorbance Curves: Copper

Absorbance Curves: Copper

Absorbance Curves: Nickel

Absorbance Curves: Nickel, Metal Ions Analyzer, Nickel Analyzer


All OMA models are equivalent in function and performance with identical electronic configurations. The models vary by form factor and materials of construction, each intended for a unique use case.



Wall-mounted process analyzer

  • Indoor/outdoor use
  • ATEX, Class I Div 1/2, GOST...
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Suitcase process analyzer

  • Carry from site to site
  • Rugged suitcase enclosure
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Rackmount process analyzer

  • Fits standard 19" rack
  • Ideal for lab/shelter
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Explosion-Proof Models

The OMA-300 is offered in two explosion-proof formats:

Exp (Purged) Explosion-Proof OMA-300


Eexp systems are purged and pressurized using a certified air-purging device. This method ensures that toxic/explosive gas is not allowed to accumulate inside the enclosure and is ideal when instrument air is available.

Exd (Cast Aluminum) Explosion-Proof OMA-300


Eexd systems are contained within certified explosion-proof cast-aluminum enclosures. This method is more practical if the installation is remote or utilities are unreliable.


The OMA is built for direct analysis of the hot/wet sample, thus simplifying the scope of the sample system and retaining high sample integrity. From our vast experience in sampling design, we know that applications can be similar but are rarely identical. For this reason, we design and build sample conditioning systems on a project basis, working from the process to the drawing board.


Note: All performance specifications are subject to the assumption that the sample conditioning system and unit installation are approved by Applied Analytics. For any other arrangement, please inquire directly with Sales.

Measurement Principle Dispersive ultraviolet-visible (UV-Vis) absorbance spectrophotometry
Detector nova II™ UV-Vis diode array spectrophotometer
Spectral Range 200-800 nm
Light Source Pulsed xenon lamp (average 5 year lifespan)
Signal Transmission 600 μm core 1.8 meter fiber optic cables
Other lengths available
Path Length Application-dependent
Sample Conditioning Custom design per application
Analyzer Calibration If possible, analyzer is factory calibrated with certified calibration fluids; no re-calibration required after initial calibration; measurement normalized by Auto Zero
Reading Verification Simple verification with samples and self-check diagnostic
Human Machine Interface Industrial controller with touch-screen LCD display running ECLIPSE™ Software
Data Storage Solid State Drive
Analyzer Environment Indoor/Outdoor (no shelter required)
Ambient Temperature Standard: 0 to 35 °C (32 to 95 °F)
Optional: -20 to 55 °C (-4 to 131 °F)
To avoid radiational heating, use of a sunshade is recommended for systems installed in direct sunlight.
Sample Temperature Standard: -20 to 70 °C (-4 to 158 °F)
Optional: up to 150 °C (302 °F) with cooling extensions
Contact AAI for temperatures above 150 °C (302°F)
Sample Pressure Using standard flow cell: 206 bar (3000 psi)
Electrical 85 to 264 VAC 47 to 63 Hz
Power Consumption 45 watts
Standard Outputs 1x galvanically isolated 4-20mA analog output per measured analyte(up to 3; additional available by upgrade)
2x digital outputs for fault and SCS control
Optional Outputs Modbus TCP/IP; RS-232; RS-485; Fieldbus; Profibus; HART;
Select analyzer type: OMA-300 Wall-Mounted Analyzer
OMA-206P Portable Analyzer
OMA-406R Rackmount Analyzer
Response Time1-5 seconds
Zero Drift±0.1 % after 1hr warm-up, measured over 24hrs (constant ambient temperature)
Sensitivity±0.1 % full scale
Noise±0.004 AU at 220 nm
Example ranges below. Custom ranges available.
Cu2+0-100 ppm: ±1 ppm
Ni2+0-100 ppm: ±1 ppm
Fe2+0-100 ppm: ±1 ppm
Cr6+0-100 ppm: ±1 ppm
Co2+0-100 ppm: ±1 ppm
Standard Design General Purpose
Available Options ATEX, IECEx, EAC, PESO, JPN
Please inquire with your sales representative for additional certifications (CSA, FM etc.).


Product Features
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Application Note
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