Hach-Lange Sigma SD900 Portable - Manual (Page 59)

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Section 6 Maintenance
CAUTION
Only qualified personnel should conduct the tasks described
in this section of the manual.
WARNING
Potential shock hazard. Always disconnect power to the
sampler before performing any maintenance or service.
CAUTION
Biological sample hazard. Follow safe handling protocols
during contact with sample bottles and sampler components.
Disconnect the sampler from power to disable the pump
before handling.
6.1 Upgrades, Repairs, General Maintenance
Only a qualified technician should service the sampler. For
example, steps that require knowledge of CMOS electrostatic
discharge precautions and advanced electronics training should
only be performed by a qualified technician.
6.2 Sampler cleaning
Sampler housing
Clean the interior and exterior of the sampler housing with a damp
sponge and mild detergent. Do not use abrasive cleaners.
Sample bottles
Clean the bottles using a brush and water with a mild detergent,
followed by a fresh water rinse and a distilled water rinse. Glass
bottles may also be autoclaved.
6.3 Pump maintenance
CAUTION
Pinch hazard. Always disconnect power to the sampler before
opening the pump cover.
The tubing in the peristaltic pump will deteriorate over time from the
action of the rollers against the tubing. Be sure to replace the pump
tubing before it splits to prolong the life of the sampler and prevent
contamination of the work area.
6.3.1 Pump tube life
Pump tube life depends on several factors:
• Distance from sample source. Locate the sampler as close to
the sample source as possible.
• Vertical lift. Minimize the vertical lift as much as possible.
• Intake rinses. Minimize the number of intake rinses prior to
sample collection.
• Sample retries. Minimize the number of sample retries to
successfully collect a sample.
• Sample volumes/duration. Minimize the volume of sample and
maximize the time between samples.