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9
Pressure
The specifications for water pressure measurements vary by CTD-Diver model. The specifications
below apply at operating temperature.
DI281
DI282
DI283
DI284
Unit
Water column measurement range
10
50
100
200
mH
2
O
Accuracy (max)
± 2.0
± 10.0
± 20.0
± 40.0
cmH
2
O
Accuracy (typical)
± 0.5
± 2.5
± 5.0
± 10.0
cmH
2
O
Long-term stability
± 2
± 10
± 20
± 40
cmH
2
O
Resolution
0.2
1
2
4
cmH
2
O
Display resolution
0.058
0.192
0.358
0.716 cmH
2
O
Overload pressure
15
75
150
300
mH
2
O
2.5.1
Water Column Measurement Range
The height of water above the CTD-Diver that can be measured.
2.5.2
Accuracy (maximum)
Accuracy is the proximity of measurement results to the true value. The algebraic sum of all the errors
that influence the pressure measurement. These errors are due to linearity, hysteresis and
repeatability. During the CTD-Diver calibration process a CTD-Diver is rejected if the difference
between the measured pressure and the applied pressure is larger than the stated accuracy.
2.5.3
Accuracy (typical)
At least 68% of the measurements during the calibration check are within 0.05% FS of the
measurement range.
2.5.4
Long-term Stability
The stability of the measurement over a period of time when a constant pressure is applied at a
constant temperature.
2.5.5
Resolution
The smallest change in pressure that produces a response in the CTD-Diver measurement.
2.5.6
Display Resolution
The smallest increment in pressure that the CTD-Diver can measure.
2.5.7
Overload Pressure
The pressure at which the CTD-Diver pressure sensor will catastrophically fail.
Summary of Contents for CTD-Diver DI28 Series
Page 1: ...CTD Diver DI28x Series...
