1
OBS501 Smart Turbidity Meter
with ClearSensor
®
Technology
1. Introduction
The OBS501 is a submersible turbidity meter that includes dual backscatter
and sidescatter sensors, shutter mechanism that keeps the lenses clean, and a
refillable biocide chamber that prevent fouling. It’s designed to prevent sand
grains or packed sediment from getting wedged between the shutter and the
sensor body, which inhibits the shutter’s movement.
The OBS501 has three communication modes: SDI-12, RS-232, or 0 to 5 V.
The mode defaults to SDI-12/RS-232 but can be set in our
Device
Configuration Utility
(
DevConfig
) to analog. As an SDI-12/RS-232 sensor, the
OBS501 is shipped with an address of 0.
This manual provides information only for CRBasic dataloggers.
It is also compatible with most of our retired Edlog dataloggers.
For Edlog datalogger support, see an older manual at
www.campbellsci.com/old-manuals
Scientific application engineer for assistance.
2. Precautions
•
section at the front of this
manual.
•
The OBS501 needs to be sent in after two years or 70,000 cycles for drive
shaft seal replacement. (See
aM9!
command in TABLE
(p. 21)
•
The sensor may be damaged if it is encased in ice. Damages caused by
freezing conditions will not be covered by our warranty.
•
Campbell Scientific recommends removing the sensor from the water for
the time period that the water is likely to freeze.
•
Minimize temperature shock. For example, do not take sensor from sunny
dashboard and immediately drop it in frigid water.
•
Ensure that obstructions are not in the backscatter sensor’s large field of
view. See Section
(p. 15)
, for more information.
•
Maximum depth for the OBS501 is 100 m.
•
The probe must be calibrated with sediments from the waters to be
monitored. The procedure for calibrating the probe is provided in Section
(p. 24)
.
NOTE
