Hach 900 MAX Instrument Manual page 120

Appendix B
Note: Before calibrating, make
certain the desired sample volume
in the Setup menu is selected.
Page 118
Programming Features
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
2. Press
VOLUME CALIBRATION
3. Select Timed Calibrate and press
4. Press
START PUMPING
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
the timed rinse cycle by pressing
Calibration Procedure—Sensor Enabled:
1. From the Main Menu, press
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
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
pressing .
TRY AGAIN
7. After pressing , a screen will be displayed asking for the Actual
DONE
Volume. This is the volume measured in the graduated cylinder. Enter this
volume and press
ACCEPT
volume is shown on top for reference.
8. When finished, re-install the pump tube onto the sample fitting.
.
OPTIONS
.
.
SELECT
. Wait while the pump purges the line, it will then
.
TRY AGAIN
.
OPTIONS
,
. The pump will purge the line, and pump a sample
. If not, repeat the cycle by
DONE
when done. Note that the requested sample
. If not, repeat
DONE
8990apdx_pfeatures.fm