Manual – Starflow Ultrasonic Doppler Instrument
Model 6526
Unidata Manual - 6526 Starflow User Manual Issue 17 01 2020.docx
Page 2
Accessories:
The following accessories should be purchased according to your application requirements.
•
Model 6907B-14
12V, 14Ah Sealed Lead Acid Battery
•
Model 6904I-10
10W Solar Recharge Panel & Mount
•
Model 6904I-20
20W Solar Recharge Panel & Mount
•
Model 6702S Starflow Weatherproof Enclosure
•
Model 6705A Small Expanding Clamp SS expanding turn-buckle and band clips.
100mm wide, 100mm long, 50mm expansion.
Use in pipes up to 600mm (24") in diameter
•
Model 6705B Large Expanding Clamp SS expanding turn-buckle and band clips.
100mm wide, 150mm long, 100mm expansion.
Use in pipes over 600mm (24") in diameter
•
Model 6705D 1800mm Band Segment 100mm wide, 0.6mm Stainless Steel band
with 50mm spaced locating holes at both ends
•
Model 6705F Band Joiner Stainless Steel joiner
2.0
OPERATING PRINCIPLES
The Starflow measures velocity, depth and temperature each scan interval (15 to 600 seconds)
and logs data according to your specification in the scheme. The measured data are logged and
then scaled and processed during presentation and processing.
The Starflow contains a 512K micrologger which controls the instrument’s operation and logs the
measurements:
Water Velocity
in the vicinity of the Starflow is measured acoustically by recording the Doppler
shift from particles and microscopic air bubbles carried in the water.
Water Depth
is measured using a solid state pressure sensor mounted underneath the Starflow
and vented to atmospheric pressure via a vent tube inside the signal cable.
Water pressure is sensed via a pressure damping manifold which has been designed to sense
depth in front of the velocity transducer.
The shape of the sensing manifold is designed to reduce velocity effects on the pressure sensor.
These effects are significant at velocities above 2m/sec.
The vent tube is opened to the atmosphere through the signal cable connector and a vent tube
desiccant canister is fitted to ensure moisture does not enter the vent tube.
Temperature
is measured to refine the acoustic recordings. These are related to the speed of
sound in water, which is significantly affected by temperature.
Battery Voltage
is measured to allow the Starflow to stop operating if the supply voltage is below
defined limits.
Flow
, flow rate and total flow values are computed by Starflow from user defined channel
dimension information (see Flow Measurement Extensions on page 59). Alternatively, the flow
rate may be computed from the refined logged data using PC based computation of area x mean
from each logged point. Total flows are then accumulated as rate x time.
