ATI
Model A15/82 Fluoride Monitor with Auto-Calibration
26
O&M Manual
Rev-G (6/10)
FLUORIDE CALIBRATION STANDARD
The automatic calibration routine uses a fluoride standard that must be prepared in a 1 gallon container
and connected as shown in Figure 5. A 1 gallon container of fluoride standard will last in excess of 6 months
assuming if calibration is done every 24 hours and in excess of 1 year if calibration is done every 48 hours. This
standard must be mixed by the user during startup of the system.
Normally, the automatic calibration standard should be around 1 PPM. The solution can be mixed easily
using the 100 PPM standard supplied with the system. Start with a 1 gallon bottle of spring water or distilled
water. Open the gallon container and pour about 100 cc into a clean container. Measure 40 cc. of 100 PPM
standard into a graduated cylinder and pour this into the gallon bottle. Fill the gallon container to about the
bottom of the neck with the water poured into the separate container. This solution will be 1.00 to 1.05 PPM
fluoride and can be used for the automatic calibration procedure.
Another option for an automatic calibration solution is to use “fluoridate spring water” purchased from a
supermarket. Spring water with fluoride added is widely available. The only limitation here is that the exact
value of this solution must be determined. This is easily done using the analyzer to make the measurement.
After completion of the two-point calibration described on page 23, place the sample pickup tube into the
purchased fluoridated spring water. Allow this sample to run for 5 minutes. Record the measured value on the
bottle.
NOTE: Once the value of the “fluoridated spring water” has been determined, you must enter this value
in the step 21 of the configuration. If you do not enter the correct value into the configuration,
the automatic calibration routine will adjust the monitor incorrectly.
