System Operation Manual
SAT-DN-00434, Rev. B
LOBO
2017-05-16
Page 76 of 86
Copyright
2017 Sea-Bird Scientific. All rights reserved.
high sediment environment. This may have to be determined through experimentation. Refer to
the ISUS-X user manual for guard assembly instructions.
➢
If the sediment in the working environment is smaller than the mesh of the Nitex screen in the
biofoul guard (normally 100 µm), sediment can become trapped as stated above. Smaller mesh
sizes are available, although the smaller size will natural passive flushing of the sample volume.
The proper size may have to be determined through experimentation.
•
The ISUS probe should also be cleaned when the biofoul guard is cleaned/replaced. Refer to the
user manual.
•
If you are using the flow cell that attaches the ISUS to the WQM (or other) pump:
➢
The ISUS probe should be cleaned at each servicing trip, or whenever the battery pack is changed.
Carefully unscrew the retaining ring to access the probe. Be careful not to loose the two small o-
rings that are on the probe. Clean the probe as described in the ISUS manual.
➢
Flush the flow cell with fresh water to remove any sediment buildup.
➢
Clean the copper outflow tube (if present) with an abrasive pad to remove any fouling.
•
Make periodic DIW checks to check for long term drifts (see sampling tips, RD4). If possible, do it each
time the flowcell or biofoul guard is cleaned/replaced, and/or when the battery pack is replaced. You
may wish to perform a DIW check prior to cleaning the probe for comparison purposes.
•
Keep track of UV lamp usage. The lamp has a 1000 hour rating to 50% intensity, although the entire
life of the lamp may not be usable. Expect to return the sensor to Sea-Bird Scientific for lamp
replacement as the lamp on-time approaches 1000 hours.
•
An annual return to Sea-Bird Scientific for inspection and recalibration is suggested.
•
Periodically check real time clock accuracy (ISUS/ISUS-X only). Plan to replace the internal clock battery
after 2-3 years. This must be performed at Sea-Bird Scientific, as the unit needs to be disassembled.
11.3
Sea-Bird Scientific Alkaline Battery Pack Maintenance
A summary is provided below. Please refer to the battery pack user manual for further information.
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Avoid dropping or other hard impacts
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Rinse with fresh water after each use
•
Store with dummy connector in place
•
Store with pressure relief plug removed.
•
Check to ensure pressure relief plug is seated properly prior to deployment to prevent flooding.
•
Lightly lubricate male connector pins with Dow Corning DC-111 lubricant or equivalent
•
Any debris (sand, mud) in the female contact sockets should be removed with fresh water to prevent
damage to the contact and o-ring
•
Do not disconnect cables by pulling on the cables. Pull straight back on the connector.
•
Do not put angular loads on the connector
•
Inspect o-rings for damage when replacing batteries.
11.4
WET Labs WQM Maintenance
A summary of maintenance steps for the WQM is provided here that is specific to the LOBO system.
Please refer to the WQM manual for complete details.
If your LOBO system does not feature a WQM with plumbing to the ISUS flow cell, you may simply follow
the directions in the WQM manual for replacing and purging the bleach system. Note you will need to
disconnect the STOR-X to WQM cable and connect the WET Labs-supplied WQM communication cable to
use the WQM host software.
