The ORAKEL range of Residual Chlorine Analysers, Residual Chlorine Controllers and Residual Chlorine Monitors are membrane devices which are insensitive to changing pH, use no reagents, are extremely stable, and have reduced maintenance and reduced whole life costs.
The membraned amperometric chlorine sensors are enhanced with a third, reference electrode which eliminates zero drift. Its unique design means that pH correction is not usually required at all, completely eliminating reagents.
In addition to the state of the art potentiostatic chrono-amperometric free chlorine and total chlorine sensors, the ORAKEL range of residual chlorine analysers has all the functionality that you need, and more.
The ORAKEL chlorine analyser range is particularly suited to working in sites where reliability and ease of use are most important.
Water Treatment applications:
- Chlorine Dosing
- Cooling Towers
- Food Preparation
- Paper Mills
- Remote Sites
- Secondary Chlorination
Chlorine sensor options:
- Free Chlorine
- Total Chlorine
- Free Chlorine ‘zero’
The ORAKEL Chlorine sensor can be installed in a variety of auxiliary flow cells and self-cleaning devices.
For some applications with high and variable pH, pH compensation can improve the accuracy of the chlorine readings. For pH compensation to be valid it must be done with the highest quality pH sensors and with chlorine sensors that have a reduced susceptibility to varying pH, such as those used in the ORAKEL range of chlorine analysers.
An alternative to pH compensation is the use of CO2 to suppress the pH such that changes in the pH of the sample do not affect the chlorine reading.
Membrane covered potentiostatic chrono amperometric three-electrode system
Total Chlorine or Free Chlorine
0.01-2mg/l, 0.01-5mg/l, 0.01-10mg/l, 0.01-20mg/l, 0.5-200mg/l (free only)
0.01mg/l (ppm) (0.1 on 0-200mg/l ranges)
Better than ±0.05mg/l
-1% per month (without calibration)
Working electrode: Gold
Counter electrode: Stainless Steel
Silver / silver halide
Micro-porous hydrophillic membrane
Approximately 0.5l/min (min 0.25l/min)
0 to <45°C
Automatically by an integrated thermistor
pH 4 up to pH 9
T90: approx.120 seconds
Manual using Electrochemical test kit or DPD test kit
PVC, silicone, polycarbonate stainless steel
Diameter approx. 25mm, length 175mm
Membrane: Once a year (depending on water quality)
Electrolyte: Once a year (depending on water quality)
High levels of other oxidants such as Ozone and Chlorine Dioxide