PHENIX
Technical Manual
v2.0
CCEI
page 15
Installing PHENIX with a chlorinator from another manufacturer:
CAUTION: This operation requires full knowledge of the equipment to be connected
and must be carried out by a professional. A wiring error could seriously damage the
equipment.
Given the variety of chlorinators available on the market, we are inviting engineers
wishing to perform this operation to contact our technical department.
SENSOR MAINTENANCE
When a pH or RedOx sensor is immersed in water, a film forms around the glass bulb
on the end. The thickness of this film increases over time. This invisible film induces
an increasingly long response time, degradation of the slope and an offset from point
0. The offset can be easily compensated for by regular calibration. The increase in
temperature is also an important factor in ageing.
Storing the sensors
Never leave the sensor immersed in distilled water.
Sensors stored wet can be reused immediately, sensors stored dry require rehydration
for several hours, but they will be less “aged”. Consequently, we recommend:
•
for long-term storage: store dry
•
for short-term storage: in a trimolar KCl solution, or failing that, in tap water.
Reconditioning sensors
The life span of a sensor can be extended by periodic reconditioning. To
recondition a sensor, leave it to soak in a dilute hydrochloric acid solution (HCl
0.1M).
To obtain this solution, add a few (8 to 10) drops of hydrochloric acid (HCl at 37%)
to a half-glass (5cl) of tap water.
When can you recondition?
-
if the slope becomes too low (often due to a contaminated or blocked junction)
-
when the response time becomes too long
-
when point 0 is offset.
Offset from point 0 can have a variety of causes:
-
electrolyte contaminated by liquid entering the sensor
-
contaminated junction
-
sensor used in an installation that has leakage currents due to improperly
insulated electrical equipment (In this case, reconditioning in unnecessary).
Calibration
Each sensor is characterised by its offset and its slope. These two measurement
points should be defined using standard solutions and transmitted to the connected
