Problem Solving - Zodiac O'Clair pH First Notice De Montage Et D'utilisation

Problem
The pH First always displays
a pH near to 7.0
The appliance always displays
a high value or the measurement
is constantly unstable
Impossible to calibrate on pH 7
(error message)
Quality of calibration of the pH
sensor < 25 %
Impossible to calibrate on pH 4
(error message)
Quality of calibration of the pH
sensor < 25 %
Slow response from the pH sensor
36
6.2.

Problem solving

Cause
Problem with cable
and / or connector
The sensor connection
cable is damaged
The pH sensor has an air
bubble in the bulb
The pH sensor is worn
The sensor cable is too close
to a power cable causing
interference
Buffer solution is ineffective
Problem with the sensor's
porous element, dirt deposits
The pH sensor is worn
Buffer solution is ineffective
Problem with the sensor's
porous element, dirt deposits
The pH sensor is worn
Static electricity
on the pH sensor
Remedy
• Make sure that the sensor-pH First connection
is not short -circuited (between the central
core of the cable and the exterior sheathing)
• Make sure that there is no moisture and / or
condensation around the BNC socket
• Check the cable and /or the BNC socket
• Put the sensor into upright position and
shake gently so that the air bubble rises back
up to the top
Note: The sensor should be fitted in a vertical
position or at an angle no greater than 45°
• Replace the pH sensor
• Reduce the distance between the appliance
and the sensor and / or place the cable else-
where
• Make sure that the solution used is pH 7
• Check the pH buffer solution with a pH
electronic meter
• Purchase a new pH 7 buffer solution
and recalibrate again
• Make sure that the sensor bulb is in good
condition, that it has not been allowed to dry
out of the water.
As a last resort, clean by soaking the elec-
trode in a 10 % hydrochloric acid solution
• Replace the pH sensor
• Make sure that the solution used is pH 4
• Check the pH buffer solution with a pH
electronic meter
• Purchase a new pH 4 buffer solution
and recalibrate again
• Make sure that the sensor bulb is in good
condition, that it has not been allowed to dry
out of the water.
As a last resort, clean by soaking the elec-
trode in a 10 % hydrochloric acid solution
• Replace the pH sensor
• During the calibration phase DO NOT WIPE
the pH sensor with a cloth or paper, but after
rinsing, shake it gently