Hach 910, Инструкция по эксплуатации инструмента

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Page 15
GettingStarted.fm
Getting Started
Section 1 Getting Started
1.1 Items Required for Installing and Using the Flow Meter
Batteries
Use only Energizer EN-529, Alkaline, 6 V dc batteries (Cat. No. 3667).
Battery Compartment Desiccant
Use a desiccant cartridge to avoid moisture damage to the batteries and
electronics. See
Desiccant Maintenance on page 37 for more information.
Level and Velocity Sensors
Select the level or velocity sensors that best suit your application. For more
information, see
Choosing the Appropriate Meter and Sensor Combination on
page 16 .
Mounting Apparatus
Select the appropriate Logger and Sensor mounting apparatus from
Replacement Parts and Accessories on page 47 .
Programming and Data Retrieval Software
These flow meters require the use of InSight
®
or Vision
®
, a high-end,
integrated sewer system management application. InSight is recommended
for small- to medium-sized flow studies. For broader applications, Vision
supports automated data collection with an unlimited number of sensors. See
Software and Communications on page 19 for more information.
1.2 Optional Accessories for Use with the Flow Meter
Rain Gauge
Connect your flow meter to the Hach tipping bucket rain gauge to record
rainfall. See
Rain Gauge on page 35 for more information.
Wastewater Sampler
Connect an optional Hach wastewater sampler to the flow meter. Models 920
and 930 can set the pace for an external sampler in proportion to flow. In
storm water applications, these models can trigger the sampler in response to
water level or rainfall.
1.3 Planning for Success: Considerations for Installing Your Flow Meter
1.3.1 Choosing the Proper Site
The accuracy of flow measurements greatly depends on the suitability of the
monitoring site. Select sites that have normalized flow and minimal
turbulence. Turbulence can make it difficult to detect an average velocity in the
flow stream. Obstructions, vertical drops, pipe bends, and elbows can create
turbulence and affect the accuracy of your measurements.
Table 1 contains
suggestions for preventing turbulence.