Chromium

Cr(III)/Cr(VI)

Applications

  • Drinking water
  • Industrial wastewater discharge limit monitoring or process optimization
  • Surface water
Chromium

Description

Colorimetric analyzer for Cr(III) / Cr(VI) ions determination.

Method

The determination is based on the reaction of 1,5-diphenylcarbazide with Chromium(VI) in an acid medium. The absorbance intensity is proportional to the chromium concentration in the sample and is measured at 525 nm.

Features

Measured parameter Cr(III)/Cr(VI)

Range

(Ø 26 mm) 0.05 - 300 ppb
(Ø 16 mm) 10 - 1000 ppb
(with dilution) 50 ppm

Reproducibility*

* if two values take whichever is greater.
(Ø 26 mm) ± 1 ppb / ± 5% (0-50 ppb), ± 2 ppb / ± 5% (50-300 ppb)
(Ø 16 mm) ± 5 ppb / ± 5% (≥ 300 ppb)
Limit of detection 0.05 ppb
Wavelength 525 nm
Demineralized water Not required
Number of reagents 2
Min. analysis time 8 minutes
Default analysis time 15 minutes

Reagent consumption**

** per month, at the default analysis frequency.
(Ø 26 mm) 1.4 L
(Ø 16 mm) 1 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,24 VDC
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

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