Emerson PN 51-1055pHC/rev.K instruction manual Procedure-Calibration against a standard solution

MODEL SOLU COMP II

Possible	Cal Error
Proceed?	Yes	No
Updated	S2 Cell

Const: 1.0013/cm

SECTION 6.0

CALIBRATION

h.If the change is more than 10% of the present value, the Solu Comp II displays a warning screen. Choose Yes to have the analyzer accept the calibration. Choose No to repeat the calibration. Go to steps i through k.

i.After the calibration is accepted, the updated cell constant screen appears for about 5 seconds.

j.The display returns to the screen in step b. Choosing Sensor1 (pH sen- sor) will permit the pH measurement to be calibrated.

k.Press EXIT to return to the previous screen. To return to the main display, press MENU followed by EXIT.

6.BEFORE RETURNING THE ANALYZER TO SERVICE, BE SURE TO SET TEMPERATURE COMPENSA- TION BACK TO THE ORIGINAL SETTING(S).

6.8.3 Procedure-Calibration against a standard solution

1.Remove the sensor from the process. Rinse it with deionized water.

2.Rinse the sensor with standard solution. Immerse the sensor in the solution to above the vent holes. Move the sensor up and down several times to ensure liquid touches all the inside surfaces. Repeat twice, using fresh solution each time.

3.If the conductivity of the standard is defined at only certain temperatures, use a constant temperature bath to keep the solution at the required temperature. Measure temperature with a calibrated thermometer or use

the Solu Comp II to measure temperature. If temperature is not shown in the main display, press or until a screen showing temperature appears. To prevent contamination and evaporation, keep the standard in a covered container until it reaches temperature. Once the standard is at the desired temperature, place the rinsed sensor in the solution. Immerse the sensor to well above the vent holes. Move the sensor up and down to let air bubbles escape. When making the measurement, keep the sensor at least 1/4 inch (6 mm) away from the bottom and sides of the container. If the sensor touches the container, the conductivity reading may be in error.

4.If the conductivity of the standard as a function of temperature is known, simply fill a container with standard solution and place the rinsed sensor in the container. Immerse the sensor to well above the vent holes. Move

the sensor up and down to let air bubbles escape. When making the measurement, keep the sensor at least 1/4 inch (6 mm) away from the bottom and sides of the container. If the sensor touches the container, the con- ductivity reading may be in error. Also place a calibrated thermometer in the solution or use the Solu Comp II to measure temperature. If temperature is not shown in the main display, press or until a screen show- ing temperature appears. Note the conductivity of the standard at the measured temperature.

5. Turn off temperature correction in the Solu Comp II.

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