INTRODUCTION
The Data Industrial® SDI Series impeller flow sensor offers unparalleled performance for liquid flow measurement in closed
pipe systems in an easy to install economical package . Impeller sensors offer a quick response to changes in flow rate and
are well suited to flow control and batch type applications in addition to flow monitoring . The four-bladed impeller design is
rugged, non-fouling and does not require custom calibration .
Coupled with the proprietary patented digital detection circuit, the sensor measures flows from 1 .0 fps to over 20 fps,
regardless of the conductivity or turbidity of the liquid .
The battery powered versions are a complete flow measuring system providing a programmable display of rate, total or both
powered by a “C” sized lithium battery . Options include a scalable pulse output and a data logger .
MODELS AVAILABLE
Direct insert sensor models
are installed in piping configurations that are not in service or under pressure .
Hot tap insert sensor models
feature isolation valves and mounting hardware to install or remove the sensor from a pipeline
that would be difficult to shut down or drain . In a true “hot tap” installation the sensor is mounted in the pipe under pressure
by attaching a service saddle or weld-on fitting to the pipe and mounting the isolating valve and nipple to the threaded
connection . A hole is then cut in the wall of the pipe through the valve using a commercial tapping machine with a
1 in . (25 mm) size shell cutter . Once the hole is cut, the tapping machine is removed and the valve is shut . Then the sensor
assembly is mounted to the isolation valve and extended into the pipeline to measure flow .
Even in new construction a hot tap sensor may be appropriate for service considerations .
The small stem diameter allows the sensor to be inserted into the pressurized pipeline by hand without the need for an
installation tool . The mounting hardware holds the sensor firmly in place at the correct depth and alignment .
ELECTRONIC OUTPUTS
Scaled Pulse Output
The scaled pulse is produced by an onboard micro-controller for precise, accurate outputs . This option may be programmed
to produce a solid state contact closure scaled to any number of engineering units of measure . Sensors may be
preprogrammed at the factory or field programmed using the ASDIB-20 SDI programming kit and Windows
®
-based software
program . All information is stored in the flow sensor non-volatile memory .
Introduction
Page 5
May 2017
SEN-UM-00217-EN-10
