Xylem H-310 - Manual (Page 13)

H-310
Installation 2-3
2.1.2 Environmental Concerns
Through years of experience dealing with measuring in the environment, we have learned that
Mother Nature is very unforgiving to electronic equipment. There are several environmental
concerns with respect to installation and use of the H-310.
1. Although the H-310 is submersible, it cannot be frozen. Damage will occur to the sensor if
it is frozen. Transducers which are installed in geographical areas with harsh winters should
be removed for the winter unless they are deep enough in the water that there is no danger of
freezing. Ice may form around the vent tube without causing damage or performance
degradation. However, the vent tube should be placed so as to minimize the possibility of it
being ripped as the ice shifts or breaks up during times of thawing.
2. As with all plastics, the polyethylene vent tube is sensitive to ultraviolet (UV) light. If
subjected to intense UV light for extended periods of time, rotting of the tube will occur.
Whenever possible, precautions should be taken to protect the above-water portion of the vent
tube from sun light.
3. Experience has shown that if part of the enclosure of the H-310 is above the water and
exposed to sunlight (e.g. installed in shallow water), a temperature gradient can occur inside
of the enclosure which will cause a partial pressure on the reference side of the sensor. This
pressure will raise or lower the H-310s pressure reading depending on the polarity of the
partial pressure. This is a "Laws of Physics" problem not unique to W
ATER LOG ® Series
transducers. It can easily be overcome by installing the transducer horizontally so that the
entire enclosure is covered by water.
2.3 Range of Stage
Use the following chart to determine the maximum depth at which the H-310 will measure
pressure accurately. Do not place the H-310 more than twice the rated depth for your model's
range, or the instrument will be damaged.
Model Pressure Range Depth Range * Accuracy
H-310-05 zero to 05 psi zero to 11.53 ft. +0.002 ft.
H-310-15 zero to 15 psi zero to 34.60 ft. +0.007 ft
H-310-30 zero to 30 psi zero to 69.20 ft. +0.014 ft.
*NOTE: Depth calculations are derived from the standard equation that one psi is generated by a
column of water 27.680 inches deep at 39.4 F.