Hach AS950 Fonctionnement page 20

11. For the portable sampler, do steps
12. If the sample volume collected is not satisfactory when compared to the sample volume that is
specified in the sampling program, do steps
Divide the total volume by 5 to get the average sample volume.
4.2.1.3 Calibrate the sample volume—liquid detector disabled
When the liquid detector is disabled, calibrate the sample volume by time. The sample volume is
calibrated for the volume specified in the current sampling program. If the sample volume is changed
in the sampling program, manually calibrate the sample volume again for the new volume.
1. Push MENU.
2. Select Hardware Setup>Liquid Detect>Status. Make sure that the liquid detector is disabled.
3. Put the intake tubing into the sample water or tap water.
4. For the AWRS sampler, put a graduated cylinder under the distributor outlet or composite tube
support inside the AWRS cabinet.
5. For the refrigerated sampler, put a graduated cylinder under the distributor outlet or composite
tube support in the refrigerated cabinet.
6. For the portable sampler, put the tubing from the outlet side of the pump into a graduated
cylinder.
7. Push CALIBRATION, then select Volume>Sample Volume.
8. Push Next. The pump operates in reverse to purge the intake tube. The pump then operates in
the forward direction and starts to collect the sample.
9. Push STOP when the volume that is specified in the sampling program is collected.
10. Push Finish to complete the calibration or Retry to do the calibration again.
11. Connect the outlet tubing to the tube fitting on the sampler.
12. Push Exit to exit the volume calibration menu.
4.2.1.4 Verify the sample volume
To make sure that the sample volume is accurate, get 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 detector is enabled, enter the volume to be verified.
6. If the liquid detector is disabled, enter the volume that is specified in the sampling program.
7. Push OK. The pump cycle starts.
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.
4.2.2 Calibrate the sensors
Calibrate the sensors connected to the sampler.
1. Push CALIBRATION or push MENU and select Calibration.
2. Select the sensor to calibrate.
3. Obey the screen prompts to complete the procedure. Refer to the sensor documentation.
4.2.3 Calibrate the cabinet temperature—AWRS sampler
Refer to the service manual available on the manufacturer's website for the calibration procedure.
20 English
3–5 again.
2–11 again with five samples.