Analisador de Óleo em Água – OIW-100

Disponível: Em Estoque

As global oil production grows each year, so does the amount of waterbeing released into the environment from refining and other processes.Continuously monitoring dynamic oil concentrations in effluent water, theOIW-100 is a painless and economical option for complying with increasinglystringent wastewater regulations.

This system uses anultrasonic homogenizer to create even droplets from un-dissolved oil, thuscreating a uniform medium for spectroscopic analysis. Measuring aromatics’absorbance across the 250-320nm wavelength range, the OIW-100 accurately correlatestotal oil concentrations down to the low parts per million (ppm).

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Turn-key control for both process and pollution.

Informação adicional


Pollution and Process Monitoring

In various industries, complying with environmentalagencies often boils down to verifying specified limits for oil content ineffluent water. For refineries and plants to validate their investments inwastewater processing, they require highly accurate online monitoring ofdissolved and un-dissolved hydrocarbon concentrations in runoff. Aside frompotential environmental code violations, higher-than-specification oil contentin post-processing water can indicate faulty equipment such as leaky heatexchangers. Also, since a portion of the water is often recycled into theprocess as cooling fluid or otherwise, oil contamination in wastewater can endup causing maintenance problems upstream.

The OIW-100 continuously monitors oilconcentrations in water ranging down to the low parts per million (ppm). Oilcontains a significant amount of aromatic hydrocarbons; crude carries around15% wt aromatics. These molecules show strong absorbance in the 250-320nmwavelength range. The nova-II spectrometer driving the OIW-100 is configured tomonitor aromatics’ absorbance in this region, correlating the data to the totaloil concentration in water; to perfect the correlation, the instrument iscalibrated for the typical composition of trace oil in the process (using acustomer sample).

Whereas basic photometric analyzers for oil inwater will measure at a single, discrete wavelength-254nm, a benzene absorbancepeak-the OIW-100 uses diode array technology, where 1,024 photodiodes monitor acontinuous absorbance range (250-320nm). This range comprises unique absorbancefeatures of light aromatics (including the benzene 254nm peak) as well asheavier aromatics. The diode array advantage is significant: monitoring thecomplete structure of the aromatic absorbance region allows for internalreferencing and produces a far more accurate measurement of total aromatics’concentration-and thus correlating more accurately to total oil-than a lone measurementat a benzene absorbance peak, a value which is susceptible tocross-interference or misattribution.

A traditional difficulty in this application is theimmiscibility of water and oil. The OIW-100 uses an ultrasonic homogenizer toforce the oil into mixture so that, for spectroscopic purposes, thehydrocarbons appear to be in aqueous solution. (For more about the homogenizer,see the sampling system tab.)

Applications for online oil-in-water analysis areoften found in:

  • Oil pollution prevention for refineries, oil fields, offshore drilling platforms, chemical and petrochemical plants, airports, steel mills, automobile manufacturing and other industries that tend to produce oily runoff
  • Treatment of wastewater, effluent streams, and rainwater
  • Deballasting
  • Any process stream sensitive to concentrations of aromatics like benzene, toluene, styrene, or xylene in water


Measurement Technology

nova-II UV-VIS diode array spectrometer

Light Source

pulsed xenon lamp (~5 year lifespan); deuterium and tungsten sources available

Sample Introduction

extractive sample conditioning system

Measurement Range

0-20 mg/L


±2% full scale

Response Time (T10 – T90)


Zero Drift

±0.1% after 1hr warm-up, measured over 24hrs (constant ambient temp.)


±0.1% full scale


0.004 AU at 220nm


for many applications, factory calibrated with calibration gases or liquids; for safety reasons, some applications require on-site calibration


easy verification/validation with gas/liquid samples or neutral density filters


Ambient Temperature

standard: 0 to 55 °C (32 to 131 °F) 
optional: -20 to 55 °C (-4 to 131 °F)

Sample Conditions


immersion probe: -20 to 150 °C (-4 to 302 °F) 
flow-through cell: -20 to 150 °C (-4 to 302 °F)


immersion probe: 100 bar (1470 psig) 
flow-through cell: 206 bar (3000 psi)


indoor/outdoor (no shelter required)



analyzer: 24′ H x 20′ W x 8′ D (610mm H x 508mm W x 203mm D) 
optional basic sampling system: 24′ H x 30′ W x 8′ D (610mm H x 760mm W x 200mm D)


32 lbs. (15 kg)

Wetted Materials

analyzer: teflon; K7 glass; Kalrez; Hastelloy C-276 
optional basic sampling system: teflon; quartz; Kalrez; Hastelloy C-276


one galvanically isolated 4-20mA output per component; modbus TCP/IP (optional); RS232 (optional); Fieldbus, Profibus, and HART (all optional); two digital outputs for fault and sampling system control (user programmable)

Electrical Requirements

85 to 264 VAC 47 to 63 Hz

Power Consumption

45 watts

Area Classification

General Purpose (standard) / Class I, Div. 2 (optional) / Class I, Div. 1 (optional) / ATEX Exp II 2(2) GD (optional)



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