Hach 900 MAX - Manual (Page 120)

Page 118
Programming Features
8990apdx_pfeatures.fm
Appendix B
When calibrating a Timed Rinse, the line is purged, then liquid is pumped
toward the sensor. When the liquid reaches the predetermined point, press
any key to stop the pump. The pump will reverse and purge the line.
Timed Rinse Calibration Procedure—Sensor Disabled:
1. From the Main Menu, press OPTIONS .
2. Press VOLUME CALIBRATION .
3. Select Timed Calibrate and press SELECT .
4. Press START PUMPING . Wait while the pump purges the line, it will then
start pulling liquid toward the pump.
5. Press any key when the liquid reaches the desired point. The pump then
reverses to post-purge the line. The pump should be stopped when liquid
has reached the point past the sensor, but not into the pump body.
6. If the timed rinse stopped where you wanted, press DONE . If not, repeat
the timed rinse cycle by pressing TRY AGAIN .
Calibration Procedure—Sensor Enabled:
Note: Before calibrating, make
certain the desired sample volume
in the Setup menu is selected. 1. From the Main Menu, press OPTIONS .
2. Press VOLUME CALIBRATION ,
3. Main Calibration is the only choice with the sensor enabled. Press
SELECT .
4. Slip the pump tube off the sample fitting (near where it exits the pump
housing) and direct the end of the pump tube into a graduated cylinder.
5. Press START PUMPING . The pump will purge the line, and pump a sample
into the graduated cylinder. The pump will then stop to allow the line to
completely drain and finally reverse to post-purge the line.
Note: To check the sample size after calibration use the Manual Mode function key to
take a grab sample. Do not go back into calibration to check the volume since the
volume compensation is reset to zero at the start of a calibration.
6. If the sample was taken, then press DONE . If not, repeat the cycle by
pressing TRY AGAIN .
7. After pressing DONE , a screen will be displayed asking for the Actual
Volume. This is the volume measured in the graduated cylinder. Enter this
volume and press
ACCEPT when done. Note that the requested sample
volume is shown on top for reference.
8. When finished, re-install the pump tube onto the sample fitting.