Campbell Scientific OBS-3A Turbidity and Temperature Monitoring System - Manual (Page 9)

OBS-3A Turbidity and Temperature
Monitoring System
1. Introduction
The OBS-3A combines our OBS® probe with pressure, temperature, and
conductivity sensors in a battery-powered recording instrument. Batteries and
electronics are contained in a housing capable of operating at depths of up to
300 meters—depending on the pressure sensor installed.
Before installing the OBS-3A, please study:
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
2. Cautionary Statements
• Although the OBS-3A is rugged, it should be handled as precision
scientific instruments.
• Maximum depth for the OBS-3A housing is 300 meters. Working depths
for individual instruments are limited by the installed pressure sensor. If
exceeded, the pressure sensor will rupture and the housing will flood.
• Bright sun near the surface (<2 meters) or black-colored sediments can
cause erroneous OBS readings.
• The OBS sensor must be kept clean to measure sediment concentration or
turbidity accurately.
• When cleaning the OBS-3A, do not use MEK, benzene, toluene, or
electronic cleaners as they could damage the OBS window.
• The conductivity sensor is very fragile and is enclosed in a hole behind the
OBS sensor. Do not poke it with any tool or object as the electrodes may
be damaged.
• Always put the OBS-3A in sleep mode when it will not be used for a while
to conserve battery capacity (see Section 6.12, Shutdown).
3. Initial Inspection
• Upon receipt of the OBS-3A, inspect the packaging and contents for
damage. File damage claims with the shipping company.
• Check this information against the shipping documents to ensure the
correct product is received (see Section 3.1, Ships With).
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