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Press CAL
Press NO
Press STAND
Press ▲ ▼ NEXT
Press OK
Press YES
Press OK
Press HOME
Press HOLD
Press EXIT
4.2 T
C
C
OTAL
HLORINE
4.2.1 A
C
UTO
AL
AUTO Calibration is an awkward calibration for the Total Chlorine sensor. It is the only way to enter the actual
zero potential of the total chlorine sensor. The Slope calibration "Cal 2" is best accomplished in the Standardized
menu, it is much easier and more straightforward.
AUTO Cal recognizes 0.00 ppm Total Chlorine solutions in Cal 1. The Zero point calibration is very consistent for
a Total Chlorine sensor and should only be done after rebuilding or replacing the sensor. To perform a zero
calibration either run chlorine free water through the flow cell or remove the sensor from the flow cell and place
it in a beaker of dechlorinated water. The zero point calibration will take about an hour for a new or rebuilt
sensor. Most sensors will burn down to a value of 0.1-0.2 mV, at this point accept the calibration and proceed to
Cal 2. Cal 2 sets the slope of the sensor. It is accomplished by setting the ppm value of the instrument to agree
with a DPD tested value of the water flowing through the TC80 Analyzer. The analyzer will suggest a corrected
value of 0.00 ppm, 5.00 ppm or 10.00 ppm, which will not be correct unless that happens to be the actual value
of the sample water, Press NO and enter the value from the DPD test. The nominal value for the slope is 5.0
nA/ppm ± 2 nA.
Action
Double Press any Button
Press HOLD
Press CAL
Press Yes/NO
Press AUTO then CAL 1
Press YES
Press OK
Press YES
Press YES
Press NO
Press OK
Press OK
Press HOME
Press HOLD
Press EXIT
Is this a new Sensor? (Yes, erases CAL Log in INFO, NO adds CAL to existing Log)
Place Sensor in CAL Solution (or leave in the process solution)
Enter Value
xx.xx pH (use arrows and NEXT to enter process pH value)
xx.xx pH, xxx.x mV, Accept Value?
OFFSET: xx.xx pH x.x mV, SLOPE: xx.xx mV/pH (this data written to Log)
Back to Cal Menu
Hold is ON (Press HOLD to turn off Hold)
Turn off Hold
Main Display
P
ALIBRATION
ROCEDURES
Prompt
MENU HOME, Hold is OFF
Hold freezes 4-20 mA Output and locks Alarm Relays during Calibration
Is this a new Sensor? (Yes erases CAL Log in INFO, NO adds CAL to existing Log)
Place TC Sensor in CAL 1 Solution ( use 0.00 ppm solution)
STABILIZING, 0.00 ppm, xxx.x nA, Accept Cal?
CAL 1 Value 0.00 ppm, 0.2 nA, OK?
Feed chlorinated water to the TC80, run DPD test when the reading stabilizes. If
the calibration times out and returns to the Home Screen, Press AUTO and select
Cal 2.
Continue to CAL2?
STABILIZING, 2.25 ppm, 13.2 nA, 5.00 ppm corrected, Accept Cal?
Enter Cal 2 Value, 2.25 ppm, Change value to the DPD tested value, OK?
OFFSET: 0.00 ppm, 0.2 nA, SLOPE: 5.86 nA/ ppm (data written to Log)
Calibration complete
Hold is ON
Turn off Hold
Main Display
34
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