Design And Function - ProMinent CTE 1-mA Instrucciones De Servicio

Sensor de cloro total

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Sensor design

The CTE total chlorine sensor comprises 3 main parts, the top section, the

electrode shaft and the membrane cap (see fig. 1). The membrane cap filled

with electrolyte forms the measurement compartment into which the

electrodes are immersed.

A micro-porous membrane separates the measuring compartment from the

sample medium.

The amplifier electronics are embedded in plastic in the upper part of the

electrode shaft.

The sensor has a passive 4-20 mA two-wire interface. The sensor's power

supply is located in an external controller, e.g. DULCOMETER

Measured

variables

Total chlorine: free chlorine (Cl

Function of

sensor

The CTE total chlorine sensor is a membrane-capped amperometric two-

electrode sensor. It has a platinum working electrode and a silver halogenide-

coated counter- or reference electrode. The chlorine compounds contained in

the sample water diffuse through the membrane. The constant polarisation

voltage between the two electrodes instigates the electrochemical reaction of

the chlorine compounds on the working electrode. The resulting current is

measured as a primary signal (amperometric measurement principle). It is

proportional within the operating range pf the sensor to the chlorine concen-

tration and this type of sensor is only slightly pH-dependant. The primary

signal is converted by the amplifier electronics of the sensor into a

4-20 mA temperature-corrected output signal which is displayed in the

DULCOMETER

The CTE sensor measurement signal follows DPD 4 detection

(see section 8.2).

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