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MODEL FCL-1056 SECTION 6.0
CALIBRATION
3. Press MENU. The main menu screen appears. The cursor will be on
Calibrate. Press ENTER.
4. Choose the sensor you wish to calibrate. Sensor 1 is the chlorine sensor.
Sensor 2 is the pH sensor.
5. Choose pH.
6. Choose Buffer Cal
7. Choose Auto.
5. USER ENTERED SLOPE AND OFFSET. If the slope and offset are known from other measurements, they can
be directly entered in the analyzer. Enter the slope as a positive number corrected to 25ºC. To calculate the
slope at 25ºC from the slope at temperature tºC, use the equation:
To calculate the offset use the following equation. The offset can be either positive or negative.
offset = mV
buffer
- (pH
buffer
- 7.00)(slope at 25ºC)
6. STABILITY SETTING. During automatic calibration, the analyzer measures noise and drift and does not accept
calibration data until readings are stable. Calibration data will be accepted as soon as the pH reading is
constant to within the factory-set limits of less than 0.02 pH change in 10 seconds. The stability settings are
programmable.
298
tºC + 273
6.4.3 Procedure-Auto Calibration
1. Obtain two buffer solutions. Ideally, the buffer pH values should bracket the range of pH to be measured.
2. Remove the sensor from the flow cell. If the process and buffer temperatures are appreciably different, place
the sensor in a container of tap water at the buffer temperature. Do not start the calibration until the sensor
has reached the buffer temperature.
Calibrate?
Sensor 1
Sensor 2
Output 1
Output 2
S2 Calibration
pH
ORP
Redox
Temperature
pH
S2 pH Cal
Zero Cal
Standardize
Slope: 56.19 mV/pH
Offset: 2mV
Buffer Cal
S2 pH Buffer Cal
Auto
Manual
Auto
Sensor 2
slope at 25ºC = (slope at tºC)