DEPTHTROUBLESHOOTING
NON-VENTED DEPTH
On occasion the depth sensor can be affected by biological fouling that grows in the water passage tube.
The tube is the opening in the sonde that is located just below the pressure case mounting hardware. At
sites where severe fouling is a problem, the passage can be lightly coated with anti-fouling paint using a
pipe cleaner to make the application. Flushing the port clean should be done at the end of each
deployment with the plastic syringe provided in the sonde maintenance kit. Instruments with the side
mounted pressure sensors require periodic flushing of all four water access holes.
VENTED DEPTH
The vented depth sensor has the same concerns and servicing needs as the standard depth transducer.
Also, it is critical to make sure that the vented level desiccant cartridge is well maintained and is
replaced when it expires. Allowing humidity into the cable vent will cause condensation to form, which
can affect the measurement and even damage the pressure transducer.
In addition to maintaining the desiccant cartridge, it is important to maintain the o-rings in the cable
connector and the bulkhead connector. Keep them lightly lubricated and consider using the optional zinc
anode kit (p/n 006182) to protect the bulkhead and cable connector from corrosion. The zinc anode
should be used in all saltwater deployments.
Calibration with a vented depth sonde must be done with a vented field cable to eliminate a pressure
offset from occurring. A 6067 calibration cable and a non-vented field cable will apply pressure to the
backside of the pressure transducer and is usually the cause of a greater than 0.15 psig offset. In an
emergency situation the o-ring in the sonde’s communication connector (BCR) can be removed to allow
a pressure bypass for calibration. Be sure to install the o-ring prior to deployment or the connector and
epth transducer will be destroyed.
If the pressure offset is greater than 0.15 psig and calibration error is ruled out, the instrument will need
to be serviced at an authorized YSI service center.
Warning: When calibrating the depth sensor, any “Out of Range” message from the sonde is cause for
concern. A transducer that has leaked water and is malfunctioning can give this warning. Deployment of
a malfunctioning depth sensor could put the entire sonde at risk for water damage.
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