Iron

Fe2+/Fe3+

Applications

  • Drinking water
  • Iron removal processes and residual coagulant monitoring
  • Industrial wastewater
  • Measurement of effluents and wastewaters
  • Boiler feed water
  • Corrosion control
  • Cooling water
  • Surface water
Iron

Description

The 3S colorimeter is a compact analytical instrumentation for online analysis and process monitoring. The colorimeter is based on a color-developing chemical reaction carried out inside the analyzer's glass cell. The sample, coming from an external reservoir or process stream is autonomously grabbed by the instrument and mixed with the appropriate reagents to make the reaction happen. The analyzer uses an LED light source and a photodiode to photometrically measure the developed color intensity (absorbance). The absorbance is proportional to the concentration of the target chemical species (analite).

Features:

  • Low reagents consumption and analytical reliability thanks to our custom designed miniature peristaltic pumps
  • Dual compartment design to guarantee a complete separation between the electronics and the hydraulic section
  • Color touchscreen to show the last measured value clearly, and to set all the options and settings via an user friendly interface
  • Datalogger function with data history in graphical form and USB download
  • Automatic calibration, validation and cleaning to reduce down time and operator intervention, their frequency can be freely set by the user
  • Fully integrable in industrial automation via the analog outputs (2 x 4-20 mA channels), digital output (2 relays + ModbusRTU) and digital input (voltage free contact)

Iron is ubiquitous on Earh's crust, it can be found in varying amounts in surface waters. It can can also be found in potable water especially when used as coagulant in water purification processes.
The determination ranges of the iron analyzer vary from trace μg/L to 200 mg/L using the (optional) internal dilution module. Ranges also depend on the chemical method used.

Method

In an acid buffered solution, ferrozine and iron react to form a purple colored complex measured at 572 nm. The absorption intensity is proportional to the iron concentration in the sample.

Features

Measured parameter Fe2+/Fe3+

Range

(Ø 26 mm) 2 - 250 ppb
(Ø 16 mm) 9 - 1000 ppb
(with dilution) 20 ppm

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 1 ppb / ± 5%
(Ø 16 mm) ± 5 ppb / ± 5%
Limit of detection 2 ppb
Wavelength 572 nm
Demineralized water Not required
Number of reagents 1
Min. analysis time 8 minutes
Default analysis time 15 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 2.5 L
(Ø 16 mm) 1.5 L

Reagents and standards

In a slightly acidic buffered solution, 1,10-phenanthroline and ferrous ion react to form an orange color in proportion to the iron concentration. The Fe(II)-phenanthroline complex is quite stable and measured at 430 nm. The absorption intensity is proportional to the iron concentration in the sample. A reduction of Iron(III) to Iron (II) must first be carried out in order to measure both iron species.

Features

Measured parameter Fe2+/Fe3+

Range

(Ø 26 mm) 0.02 - 3 ppm
(Ø 16 mm) 0.05 - 7 ppm
(with dilution) 200 ppm

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 0.02 ppm / ± 5%
(Ø 16 mm) ± 0.05 ppm / ± 5%
Limit of detection 0.02 ppm
Wavelength 430 nm
Demineralized water Not required
Reference ISO 6332:2009
Number of reagents 2
Min. analysis time 7 minutes
Default analysis time 20 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 3.5 L
(Ø 16 mm) 2 L

Reagents and standards

Technical Specifications

Model 3S-CL
Sampling Mode Batch, with freely settable frequency.
Sample Pressure: Atmospheric
Temperature: 5 ‐ 45°C (41 ‐ 113°F)
Flow Rate: 80 to 500 mL/min
Connection: 6 mm (¼-in.)
Drain Pressure-free drain
Connection: 12 mm (½-in.)
Input Streams 2
Material Epoxy-coated stainless steel AISI 304
Dimensions (H x W x D) 604 x 380 x 210 mm (23.6 x 14.8 x 8.2 in)
Weight 20 kg (44 lbs)
Power Supply Input Voltage: 115 VAC,230 VAC
Power consumption: max. 80 W
Output signals 2 x 4-20 mA analog outputs
Modbus via RS485,Ethernet
Alarms 2 SPDT programmable voltage-free relays
Digital Input None, Online, Start Extra, Skip Idle, Emergency Stop
Ambient Temperature 5 - 45 °C (41 - 113 °F)
Ambient Humidity 10 - 90 % RH (non-condensing)
Protection Grade IP54 (indoor only, outdoor use possible with external cabinet, not included)

Documentation

Related Accessories