Hach SD900 Manuel D'utilisation De Base page 21

7. If the volume that was collected is different from the sample volume in the current program, enter
the volume that was actually collected. Push ENTER. The sensor is adjusted to accurately
measure all programmed volumes.
8. Select START to start the sampling program or CANCEL to exit the volume calibration menu.
Calibrate the sample volume manually
When the liquid sensor is disabled, all volumes must be calibrated manually by time. The sample
volume is calibrated for the volume specified in the current program. If the sample volume is changed
in the program, the sample volume must be calibrated again for the new volume.
1. Select PROGRAM SETUP>MODIFY SELECTED>LIQUID SENSOR>DISABLE to make sure that
the liquid sensor is disabled.
2. Put the intake tubing into the sample water or tap water.
3. Put the tubing from the outlet side of the pump into a graduated cylinder.
4. Push VOLUME CALIBRATION. If more than one volume is shown, select one of the volumes for
calibration.
5. Select START. The pump operates in reverse to purge the intake tube. The pump then operates
in the forward direction and starts to collect the sample.
6. Stop the pump at the selected volume or rinse location:
• Sample volume: push STOP when the volume that is specified in the main program is
collected.
• Rinse: push STOP when the liquid in the intake tubing gets to the liquid detector.
• Storm volume: push STOP when the volume specified in the stormwater program is collected.
7. Select DONE to go to the next volume calibration or REPEAT to do the calibration again.
8. When all volumes have been calibrated, select DONE.
9. Connect the outlet tubing to the tube fitting on the sampler.
10. Select START to start the sampling program or CANCEL to exit.
Verify the sample volume
To make sure that the sample volume is accurate, 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.
1. Push MANUAL OPERATION.
2. Select GRAB SAMPLE.
3. Put the intake tubing into the sample water.
4. Put the tubing from the outlet side of the pump into a graduated cylinder.
5. If the liquid sensor is enabled, enter the volume to be verified.
6. If the liquid sensor is disabled, enter the volume that is specified in the program.
7. Push ENTER. The pump cycle starts (purge-sample-purge).
8. Compare the volume that was collected in the graduated cylinder to the expected volume. If the
collected volume is not correct, do the volume calibration again.
Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
D A N G E R
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