Emerson Clarity II Instruction Manual page 43

MODEL CLARITY II
Refer to the table to select the appropriate size volumetric flask and pipet. A single calibration requires about
300 mL of standard. Be sure to thoroughly mix the 4000 NTU standard before withdrawing liquid from the
bottle. DO NOT SHAKE VIGOROUSLY.
For example, to prepare 1.00 L of a 20.0 NTU standard, pipet 5.00 mL of 4000 NTU standard into a 1.00 L vol-
umetric flask and dilute to volume with the filtered deionized water obtained in step 1. Gently invert the flask
several times to mix. DO NOT SHAKE VIGOROUSLY. Use the 20.0 NTU standard within four hours after
preparing it. Before removing a portion of standard, mix well by gently inverting the flask repeatedly for at least
one minute.
Turbidity standards other than 20.0 NTU can be used to calibrate the sensor.
However, for greatest accuracy, particularly when measuring water having low tur-
bidity, 20.0 NTU standard is recommended. If the measured turbidity is at the
upper end of the scale (>100 NTU), calibrate at 200 NTU.
For users who do not have the appropriate volumetric glassware, a kit containing 4000 NTU standard, a vol-
umetric flask, and a pipet is available (PN 060-761855).
3. Rinse the calibration cup several times with filtered deionized water. Fill the calibration cup with filtered de-
ionized water to the level of the groove cut inside the cup.
4. Remove the sensor from the flow chamber. If the sensor is dirty, clean it by wiping with a soft, damp cloth.
Rinse the sensor with filtered deionized water and place it in the calibration cup. Swirl the sensor to remove
air bubbles. It is not necessary to completely screw the gray coupling nut onto the calibration cup.
C C a a l l i i b b r r a a t t e e
Program Display
Calibrate?
S S e e n n 1 1 Sen2
Calibrate?
S S e e n n s s o o r r
C C a a l l i i b b r r a a t t e e
Enter TSS Data
S S l l o o p p e e
Standard
Sensor in pure
H2O? Press ENTER
4000 NTU stnd
5.00 mL
10.00 mL
BEFORE REMOVING THE SENSOR, be absolutely
certain the process pressure is reduced to 0 psig
and the process temperature is at a safe level.
5. Press MENU. The main menu screen appears. Choose Calibrate.
Hold
6. If the sensor has dual input, choose Sen1 (sensor 1) or Sen2 (sensor 2).
Output
If the analyzer has single input, choose Sensor.
Output
7. Choose Calibrate.
>>
8. Choose Slope. If Lamp appears in this screen, refer to Section 6.5.
Grab
9. The analyzer prompts the user to put the sensor in filtered water. Press
ENTER.
Final volume
1.00 L
2.00 L
NOTE
CAUTION
procedure continued on following page
SECTION 6.0
CALIBRATION
35