Manual – Starflow QSD Model 6527B and 6537A
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 08 05 2023.docx
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If the data logger used to read the Starflow QSD does not incorporate a barometric pressure
sensor, then the One Wire Bus 6515 Reference Barometer option should be purchased.
6515 should be mounted near the logger and is read by the Starflow QSD instrument, which
will then automatically compensate for the atmospheric pressure variations ensuring an
accurate depth measurement is achieved. This enables Starflow QSD to report actual water
depth (pressure) instead of barometric pressure plus water head.
4.4 Temperature
A solid-state temperature sensor is used to measure the water temperature. The speed of
sound in water and its conductivity are affected by temperature. The instrument uses this
measured temperature to compensate for temperature variations automatically.
4.5
Electrical Conductivity EC 6537A Only
The 6537A Starflow QSD is equipped with the capacity to measure the conductivity of the
water. A linear four-electrode configuration is used to make the measurement. A small
current is passed through the water, and the voltage developed by this current is measured.
The instrument uses these values to calculate the raw uncorrected conductivity.
Conductivity is dependent on the temperature of the water. The instrument uses the
measured temperature to compensate for the returned conductivity value. Both raw and
temperature-compensated conductivity values are available.
4.6 Accelerometer
The Starflow QSD has an integral accelerometer sensor to measure the inclination of the
instrument. The sensor returns the roll and pitch angle of the sensor (in degrees). This
information can be useful in ensuring the installation position of the sensor is correct and for
determining if the instrument has moved (bumped or washed away) during the post-
installation inspection.
4.7
Power Supply Voltage
The instrument’s internal power supply voltage is readable as a measurement parameter.
The operating range of the power supply is 12 to 24V DC. If the supply voltage falls below
defined limits, the instrument stops taking measurements to ensure only quality data is
measured.