Performance - Valeport miniSERIES Series Operating Manual

3.8. Performance

Sensor
Range
Sound Velocity
Accuracy
Resolution
Range
Conductivity
Accuracy
Resolution
Range
Pressure (Bar) Accuracy
Resolution
Range
Temperature
Accuracy
Resolution
Certain features of the sensors used in the "mini" range are designed specifically to enable high quality data to be
delivered:
Sound Velocity (miniSVP)
Carbon Composite Rods:
Digital Sampling
Technique:
Conductivity (miniCTD)
Construction Materials:
Digital Sampling
Technique:
Pressure (miniTIDE)
Temperature
Compensation:
Page 11
miniSVP
1400 – 1600m/s
±0.02m/s
0.001m/s
10, 50, 100, 300, 600 10, 50, 100, 300, 600
±0.05% range
0.001% range
-5 to +35°C
±0.01°C
0.001°C
The carbon composite material used for the sensor spacer rods has been specifically
selected to provide 3 features:
a) Excellent corrosion resistance
b) Very high strength
c) Virtually zero coefficient of thermal expansion
This last point is particularly important; accurate sound velocity measurement relies
on measuring the time taken for a pulse of sound to travel a known distance. The
material selected does not measurably expand over the operating temperatures of
the instrument, ensuring the highest possible accuracy at all times.
Enables a timing resolution of 1/100th of a nanosecond, equivalent to about
0.5mm/sec speed of sound on a 25mm path sensor, or 0.125mm/sec on a 100mm
sensor. In practice, the output is restricted to 1mm/sec resolution.
Linear sensor performance allows easy calibration.
The materials used in the Valeport Conductivity sensor have been specially chosen
to resist compression at high pressure, This unique approach ensures that it performs
within specification under even the harshest of field conditions.
A new digital sampling technique allows the Valeport conductivity sensor to operate
with significantly less noise and greater long term stability than traditional inductive
cells.
A new temperature compensated piezo-resistive pressure sensor allows performance
levels traditionally associated with costly resonant crystal sensors.
miniCTD
0 – 80mS/cm
±0.01mS/cm
0.001mS/cm
10, 30, 100, 300, 600
±0.05% range ±0.01% range
0.001% range 0.001% range
-5 to +35°C
±0.01°C
0.001°C
© 2019 Valeport Ltd
Specifications
miniTIDE