HF scientific 19944 Triple Validation Turbidimeter - 0-100 NTU - Manual (Page 18)

TVT2 (5/02)
Rev. 1.7 (.pdf) 13
When the calibration procedure for the 10.0 NTU level is complete the CAL and
STORE blocks will stop flashing. You will see the following on the display:
11. Then, you will see the following on the display:
12. Drain the 10.0 NTU calibration standard from the sample well and rinse the well at
least twice with 0.02 NTU water.
13. Fill the well with 0.02 NTU water and then place the black cleanout plug on the
sample well (to block light).
14. Press the
↵ ↵↵ ↵
button to indicate to the instrument that you wish to calibrate on the 0.02
NTU calibration level. Once you have pressed the
↵ ↵↵ ↵
button, the current reading will
be actively displayed on the LCD display. Wait for the reading to stabilize, once the
reading has stabilized press the
↵ ↵↵ ↵
button again. The word CAL will appear on the
upper row of the LCD display and the word NO will appear on the lower row of the
LCD display.
15. This is the final step for calibration on the 0.02 NTU level; if you wish to exit without
calibrating simply press the
↵ ↵↵ ↵
button at this time. However, if you are satisfied and
wish to complete calibration on the 0.02 NTU level use the
tu
arrows to select the
word YES on the lower row of the display and then press the
↵ ↵↵ ↵
button to initiate
calibration. Both the CAL and STORE blocks will flash during the operation and
the word YES will change to a count down starting at 90. When the calibration
procedure for the 0.02 NTU level is complete the CAL and STORE blocks will stop
flashing.
Note: Prior to exiting the calibration routine ensure that the process water is flowing
through the sample chamber. This will help prevent unwanted spikes in the outputs
from the instrument.
16. The word END will appear on the lower row of the LCD display.