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1.0 Introduction
The Walchem disinfection sensors consist of an amperometric
sensor assembly and a flow cell. Assembly of these parts is
required, so please read these instructions carefully. The sensor is
capable of measuring the disinfectant in clean water or in water
contaminated with debris thanks to our unique flow cell design.
WDSW100, WCNP100, WDS600, W900 and WebMaster series
controllers with amperometric chlorine sensors can be used for
reporting chlorine residual measurements in accordance with EPA
Method 334.0.
The standard (part numbers 104010
,
191300, 191441, 191530 &
191587) free chlorine/bromine sensor membrane is not compatible
with water containing surfactants!
Sensor
The sensor assembly includes the sensor body, a replaceable
membrane cap, a 100-ml bottle of electrolyte fill solution, and
special abrasive paper. Make sure that all parts are included.
The oxidizer molecules diffuse through the membrane and in the
acidic environment of the electrolyte fill solution, a redox reaction
occurs at the electrodes in the sensor. The current generated by this
reaction is converted to a robust voltage signal that is linear with the
concentration of the oxidizer.
Flow Cell
The flow cell consists of a translucent flow cell body, mounting nut
and o-ring, washer set and o-ring. Make sure that all parts are
included.
The flow cell is required to prevent bubble formation on the
membrane and to provide proper flow velocity across the face of the
membrane. The sensor will not read accurately if it is not installed
in the flow cell, with a flow rate between 30 and 100 liters per hour,
at an operating pressure of 1 atmosphere or less. The ¼” adapter
must NOT be removed from the flow cell.
