HF scientific 19998 Triple Validation Turbidimeter - 0-100 NTU - Manual (Page 17)

TVT 1 (5/02) 11
Rev. 2.6 (.pdf)
2. Shut off flow to the instrument.
3. Disconnect the quick connects at the top and bottom to separate the instrument from the
process stream, then unscrew and remove the cleanout plug on the instrument.
4. Open the drain valve to allow the process water to drain from the sample well and then close
the drain. Capture this water in a container if spilt water is not wanted.
5. Pour 0.02 NTU or “turbidity free” water into the optical well and use the brush, provided
with the instrument, to clean out the sample well.
6. Drain the sample well and rinse the well at least twice with 0.02 NTU water.
7. After the sample well is drained close the drain valve and add 10.0 NTU calibration standard
to rinse out the optical well. Repeat this step and drain the optical well.
8. Pour the 10.0 NTU calibration standard into the sample well (ensure that the well is
completely filled). Place the black cleanout plug back on the sample well (to block light).
Note: If you choose to use Formazin, be sure to clean the sample well immediately after
using Formazin and prior to returning to the measurement mode.
9. Press the
↵ ↵↵ ↵
button to indicate to the instrument that you wish to calibrate on the 10.0 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.
10. This is the final step for calibration at the 10.0 NTU level; if you wish to exit without
calibrating simply press the
↵ ↵↵ ↵
button. However, if you are satisfied and wish to complete
calibration on the 10.0 NTU level use the
tu
arrows to select the word YES on the lower