System Startup
41
• Always clean the turbidimeter body or calibration cylinder per the instructions
in section 6.4.3 on page 48. Rinse with deionized water before calibrating.
• Store the calibration cylinder upside-down to minimize contamination between
calibrations.
• Pour the calibration standard into the turbidimeter body at the inflow end (left
side when facing the instrument).
• Gently invert StablCal standards for 1 minute before opening. Do not shake.
This ensures a consistent turbidity of the standard.
• If the 20.0 NTU StablCal standard is allowed to sit in the calibration cylinder or
turbidimeter body for more than 15 minutes, it must be remixed (gently swirled
in the calibration cylinder) before use to ensure a consistent turbidity.
• Discard all standards after use per the instructions on the container.
Never transfer the standard back into its original container. Contamination
will result.
• Always recalibrate after restoring default settings.
5.3.1 User-prepared Calibration
Before starting the calibration, read and apply the tips in section 5.3.
Follow the procedure as written (using 1 L of deionized water and 5.0 mL of
4000 NTU formazin) if using a calibration cylinder for calibration.
If using the turbidimeter body for the user-prepared calibration follow the
procedure below using 20 NTU formazin in step 6c. Prepare the standard as
follows:
1. Stop the sample flow, then drain and clean the body.
2. Prepare a 20 NTU standard by adding 5.0 mL of 4000 NTU formazin to a
1-L flask. Dilute to the mark with deionized water and invert gently to mix.
3. Drain the deionized water and pour the prepared 20 NTU standard into the
turbidimeter body at step 6c. Do not add additional 4000 NTU formazin.
Step Select Menu Level/Instructions Confirm
1
MAIN MENU —
2
SENSOR SETUP
3
SELECT SENSOR (if more than one sensor is connected)
4
CALIBRATE
5
— USER PREPD CAL
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