User`s manual

Section 5: Configure Menu, Part III - Calibration Coefficients
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Calibration Coefficients for Voltage Sensors
For all calibration dialog boxes, enter the sensor serial number and calibration
date. Many sensor calibration equations contain an offset term. Unless noted
otherwise, use the offset (default = 0.0) to make small corrections for sensor
drift between calibrations.
Calibration coefficients are discussed below for each type of sensor. Strain
gauge pressure sensors are covered first, followed by the remaining voltage
sensor types in alphabetical order.
Pressure (Strain Gauge) Calibration Coefficients
Enter coefficients:
• Pressure sensor without temperature compensation
! Enter A0, A1, and A2 coefficients from the calibration sheet
! For older units with a linear fit pressure calibration, enter M (A1) and
B (A0) from the calibration sheet, and set A2 to zero.
! For all units, offset is normally zero, but may be changed for non-
zero sea-surface condition. For example, if the in-air pressure reading
is negative, enter an equal positive value.
• Pressure sensor with temperature compensation
Enter ptempA0, ptempA1, ptempA2, pTCA0, pTCA1, pTCA2, pTCB0,
pTCB1, pTCB2, pA0, pA1, and pA2 from the calibration sheet.
Altimeter Calibration Coefficients
Enter the scale factor and offset.
altimeter height = [300 * voltage / scale factor] + offset
where
scale factor = full scale voltage * 300/full scale range
full scale range is dependent on the sensor (e.g., 50m, 100m, etc.)
full scale voltage is from calibration sheet (typically 5V)
Fluorometer Calibration Coefficients
• Biospherical Natural Fluorometer
Enter Cfn (natural fluorescence calibration coefficient), A1, A2, and B
from calibration sheet.
natural fluorescence Fn = Cfn * 10
V
production = A1 * Fn / (A2 + PAR)
chlorophyll concentration Chl = Fn / (B * PAR)
where
V is voltage from natural fluorescence sensor
Note:
To enter the altimeter alarm
set point, alarm hysteresis,
and minimum pressure to
enable alarm, select
Alarms in SEASAVE’s
Configure menu.
Note:
See Calibration Coefficients for
A/D Count Sensors above for
information on strain gauge
pressure sensors used on the
SBE 16plus, 19plus, and 49.
See Calibration Coefficients for
Frequency Sensors above for
information on Paroscientific
Digiquartz pressure sensors.