Hach-Lange Sigma SD900 Portable - Manual (Page 47)

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Sampler operation
4.8.1 Volume calibration using the liquid sensor
Use the volume calibration with the liquid sensor enabled to adjust
sample volumes slightly.
Procedure:
1. Make sure the liquid sensor is enabled by selecting PROGRAM
SETUP > MODIFY SELECTED > LIQUID SENSOR > ENABLE .
2. Press VOLUME CALIBRATION and select CALIBRATION .
3. Remove the outlet pump tube from the fitting on the sampler
and place the tube into a graduated cylinder. Place the intake
tube into the sample source or tap water.
Note: Use the sample source for best accuracy.
4. Select START .
5. The pump will purge the intake tube and then collect the
sample volume that is specified in the sampling program. The
pump will then purge the intake tube.
To halt the calibration at any time, press the STOP key.
6. When the sample has been collected, select DONE . Compare
the volume collected in the graduated cylinder with the sample
volume that is entered in the program setup menu.
Select REPEAT to repeat the volume collection if necessary.
7. If the volume that was collected is different from the sample
volume in the current program, enter the volume that was
actually collected. Press
ENTER . The sensor is then adjusted to
accurately measure all programmed volumes.
To verify sample volume, collect a grab sample ( section 4.8.3
on page 47 ).
8. Select START to start the sampling program or CANCEL to exit
the volume calibration menu.
4.8.1.1 Reset the calibration
Use the reset cal option to restore the volume calibration to the
default factory settings.
Procedure:
1. Make sure the liquid sensor is enabled by selecting PROGRAM
SETUP > MODIFY SELECTED > LIQUID SENSOR > ENABLE .
2. To undo the calibration, press VOLUME CALIBRATION and
select RESET CAL .
3. The calibration will be reset to the default calibration and the
message “value has been reset to 0” will be shown.