Description

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.

APPLICATIONS

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.

PH COMPENSATION

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.

PRODUCT SPECIFICATION

Type
Membrane covered potentiostatic chrono amperometric three-electrode system

Measurement
Total Chlorine or Free Chlorine

Range
0.01-2mg/l, 0.01-5mg/l, 0.01-10mg/l, 0.01-20mg/l, 0.5-200mg/l (free only)

Resolution
0.01mg/l (ppm) (0.1 on 0-200mg/l ranges)

Reproducibility
Better than ±0.05mg/l

Stability
-1% per month (without calibration)
Working electrode: Gold
Counter electrode: Stainless Steel

Reference electrode
Silver / silver halide

Membrane material
Micro-porous hydrophillic membrane

Flow rate
Approximately 0.5l/min (min 0.25l/min)

Temperature range
0 to <45°C

Temperature compensation
Automatically by an integrated thermistor

pH-range
pH 4 up to pH 9

First-polarisation time
2 hours

Re-polarisation time
30 min

Response time
T90: approx.120 seconds

Zero-point adjustment
Not necessary

Calibration
Manual using Electrochemical test kit or DPD test kit

Housing material
PVC, silicone, polycarbonate stainless steel

Dimensions
Diameter approx. 25mm, length 175mm

Maintenance intervals 
Membrane:     Once a year (depending on water quality)
Electrolyte:     Once a year (depending on water quality)

Interferences
High levels of other oxidants such as Ozone and Chlorine Dioxide