40
membrane
pH indication lower than
actual value
Temperature indication is
higher than actual value.
Calibrate pH sensor
Calibrate the Temperature
(see Calibration) The
temperature sensor lags the
process temperature wait for
temperature equilibrium.
Zero Chlorine Reading
No electrolyte in the sensor
Open Circuit on FCS, broken
or bad electrical connection
Refill Sensor
Check connector and wiring to
the connector inside the T80
Unstable Chlorine Reading
Air bubbles on the membrane
Changing temperature, the
lag of the temperature sensor
looks like drift
Loosen TCS fitting and lift
sensor slightly to purge air
trapped in the flow cell.
Wait for equilibrium
Green LED
flickering or no
light
Supply Voltage to low
Defective Sensor
Verify 24V DC between the
Blue and White sensor wires
Return sensor to the
manufacturer for
reconditioning
Orange LED,
Continuously ON
Flickering
Wrong Polarity on signal
wires
Chlorine concentration to
high, sensor over range
Verify Black #3, Yel/Grn #2
Check for torn membrane,
verify chlorine concentration,
Recalibrate the sensor