Hummingbird Communications Paracube Micro, Инструкция по эксплуатации

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17 of 35 01115009A _9
Paracube
®
Micro – Instruction Manual
The accuracy of error correction achieved by pressure compensation is detailed in
Section 3.1.
Method 3 – with Sensor’s On-board Pressure Compensation Disabled
In some cases it may be desirable for the end user to perform their own pressure
compensation. During sensor calibration, the span gas value and pressure reading
should be recorded. These values may then be used to correct the oxygen signal for
changes in sample pressure (if sensor is housed in a closed sample system) or
barometric pressure (if sensor is open to ambient conditions) according to the following
formula:
Where:
% O
2
comp
: Compensated O
2
value
% O
2
ind
: Current O
2
value
P
cal
: Calibration pressure
P
ind
: Current pressure
⎥⎦
⎤
⎢
⎣
⎡
× =
ind
cal
ind Comp
P
P
O O
2 2
% %
CAUTION – No. 7
If pressure compensation is toggled between its two operational
states a ‘C’ flag will appended to the output indicating a two point
calibration is required to ensure a valid oxygen reading.
CAUTION – No. 6
Pressure compensation is factory configured to measure internal
(sample gas) or external (barometric) pressure. Selecting the right
product variant for the application is essential if compensation is to
be applied correctly. The compensation is not interchangeable.
Note - No. 2
Users of variants 01115714, 01115715, 01115716 and 01115717
should refer to section 5 for guidance on how to provide their own
pressure compensation.