Ml/Sec - Hach LQV157.99.50001 User Instructions

4. Select On to enable the sipper operation.
Note: When On is selected, the sipper unit completes a sipper cycle before each measurement and a purge
cycle (if enabled) after each measurement.
5. Select and configure each option.
Option Description
Sip Time Sets the period of time that the sipper unit pulls the sample through the process vial before
each measurement. Options: 1 to 300 seconds (default: 120 seconds). The pump flow speed is

1 mL/sec.

Settle Time Sets the period of time that the sample sits in the process vial before it is measured. Options:
1 to 300 seconds (default: 60 seconds). Use the Settle Time setting to let the air bubbles and
turbulence in the sample decrease before each measurement.
Purge Time Sets the period of time that the sipper unit pulls a user-supplied rinse agent through the
process vial when a purge cycle is done. Options: Off (default) or 1 to 300 seconds (default:
120 seconds).
Note: A minimum of 120 mL of rinse agent is necessary to remove sample from the tubing.
Purge Start Sets the purge cycle to start automatically after a measurement or when the user pushes
Purge. Options: Auto (default) or Manual.
Note: The Purge Start button is only enabled when Purge Time is set to on.
6. Push OK.
To exit and not save the changes, push Cancel. To change the settings to the factory default
settings, push Default.
Flush the vial and tubing
Before initial use of a new process vial or tubing, flush the process vial and tubing as follows:
1. Put the inlet tubing in approximately 400 mL of deionized water.
Make sure that the tube opening is at the bottom of the container.
2. Push Sipper, then push Purge to start a purge cycle.
3. Do step 2 again until approximately 360 mL of deonized water is pulled through the process vial
and tubing.
4. Push OK.
Measure a sample
1. Do a purge as follows:
a. Put the inlet tubing in deionized water.
b. Push Sipper, then push Purge to start a purge cycle.
c. Push OK.
2. Put the inlet tubing in the sample.
3. Push Read. The sipper unit completes a sipper cycle, then the turbidimeter measures the
sample.
If the Purge Start setting is set to Auto, a purge cycle is completed after the measurement.
If the Purge Start setting is set to Manual, the Read button changes to a Purge button.
4. Push Purge to start a purge cycle if applicable.
5. Do steps 3 and 4 again until the sample measurements are complete.
6. Do a purge. Refer to step 1.
Prepare the flow-thru head for storage
Before short-term storage, flush the process vial and tubing. Refer to
on page 9.
Flush the vial and tubing
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