Hach-Lange SD900 Refrigerated Sampler, SD900 AWRS User Manual - Manual (Page 29)

• High setpoint off—indicates that a user-specified high setpoint is cleared, the measurement
channel of interest and the current measurement value.
• Low setpoint on—indicates when a user-specified low setpoint is activated, the measurement
channel of interest and the current measurement value.
• Low setpoint off—indicates when a user-specified low setpoint is cleared, the measurement
channel of interest and the current measurement value.
Erase the event log
Erase the event log after event details have been reviewed to reduce the number of entries that are
shown.
1. Select DIAGNOSTICS>EVENT LOG from the main menu to erase the event log.
2. Select ERASE.
3. Select YES to confirm the deletion.
View data from SDI-12 devices
If a sonde is detected on the SDI-12 interface and the sonde provides measurement data, the user
can view the current status of these measurements. Push STATUS or select STATUS in the main
menu.
The measurement status screen shows current measurement of each channel on the sonde which
includes the measurement name and unit assigned to each specific channel. The measurements will
be updated based on the user-defined scan interval. Navigation arrows on the screen indicate
whether additional channel information is available. CH0..CHX indicates the current position within
the available channels.
Volume calibration
The sample volume can be calibrated automatically with the liquid sensor or manually. When the
liquid sensor is used for volume calibration, the sensor is adjusted to accurately measure all
programmed volumes. If the liquid sensor is disabled, the volume for samples, rinses and stormwater
must be calibrated manually.
For typical applications, tap water can be used for the volume calibration. If the sample composition
is significantly different from typical water samples, calibrate the sampler with the liquid to be
collected. All programs must be stopped before calibration.
Calibrate the liquid sensor
The accuracy of the liquid sensor varies with the type of liquid that is sampled. For example, the
volume of a highly turbid sample may not be as accurate as that of clear water. The liquid sensor can
be calibrated with the sample water to improve volume accuracy.
1. Put the intake tubing into the sample water.
2. Push MENU.
3. Go to PROGRAM SETUP>MODIFY SELECTED>LIQUID SENSOR>ENABLE to make sure that
the liquid sensor is enabled.
4. Go to SYSTEM SETUP>LIQ SENSOR CAL.
5. Select PERFORM CAL.
6. Select START. The pump operates in reverse to purge the intake tube. The pump then operates
in the forward direction.
7. Look at the sample flow in the intake tube to make sure that the sample goes through the liquid
sensor.
8. When the sample goes through the liquid sensor and no bubbles are present, push STOP. The
intake tube is automatically purged. The liquid sensor calibration is complete.
9. Select DONE to exit or REPEAT to do the calibration again.
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