Section 4
Sensor maintenance
C A U T I O N
Do not use acetone or other solvents to clean any part of the sensor.
1.
After each cast or exposure to natural water, flush the sensor with clean fresh water.
2.
Use soapy water to clean any grease or oil on the optical face of the sensor. It is
made of ABS plastic and optical epoxy and can be damaged if an abrasive cleaner is
used.
3.
Dry the sensor with a clean soft cloth.
4.1 CT-DO maintenance
C A U T I O N
Do not use Triton
®
X-100 for long wash periods. Long exposure to Triton
®
X-100 damages the DO
sensor membrane and changes the calibration of the sensor.
C A U T I O N
Never put undiluted Triton
®
X-100 or bleach into the sensor.
Note: A stronger solution does not clean better. Do not use stronger solutions or longer wash times
than those recommended by the manufacturer.
Clean the conductivity cell and the dissolved oxygen sensor, which are in the CT-DO flow
path. Sensors that have marine growth that can be seen are dirty. The user may need to
do the steps below up to five times.
Supplies:
•
De-ionized or distilled water. If unavailable, use fresh tap water, used with Triton
®
X-100 or bleach. Do not use shipboard fresh water because it can have traces of oil
in it.
•
Triton
®
X-100 mixed 1000:1—The manufacturer supplies Triton
®
X-100 with each
sensor. Triton
®
X-100 is octyl phenol ethoxylate, a mild, non-ionic detergent. Make
sure that any alternative detergent that is used is scientific grade, with no colors,
perfumes, glycerins, lotions, etc.
•
Bleach mixed 50:1—Household bleach is usually 4–7% (40,000–70,000 ppm) sodium
hypochlorite with stabilizers.
•
Manufacturer-supplied CT-DO cleaning device.
•
19 liter (5 gal.) container to put water and the sensor in.
1.
Bend the exhaust tube assembly to remove the exhaust tube from the lower elbow
fitting.
Figure 1 Exhaust tube removed from elbow fitting
21
Содержание WQM Series
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