SonTek/YSI
Using Frequency Pressure Sensors with SonTek/YSI Systems (December 2001)
4
4. Additional System Commands
This section describes the system commands used for external pressure sensor operation.
4.1. ADPs and Hydras
The following commands apply to ADP and Hydra (ADVOcean) systems that have an external
pressure sensor installed.
ExtPressureSensorInstalled Set [NONE|PAROS|DRUCK|PAROSFREQ]
•
Selects or disables the external pressure sensor type.
•
Set at the factory. Does not need to be changed except in some special cases.
•
The external pressure sensor option limits the maximum sampling rate of an ADV to 4 Hz
for the
PAROS
and to 10 Hz for a
DRUCK
or
PAROSFREQ
. To collect data at faster rates, you
must disable the external pressure sensor option.
PressFreqOffset Set [d]
•
Default parameters (in kHz):
0
(for
DRUCK
);
21
(for
PAROSFREQ
)
•
Sets/displays frequency offset (in kHz).
•
This parameter is set at the factory and should not be changed by the user.
PAROS CONT or DRUCK CONT or PAROSFREQ CONT
•
This command provides a useful tool to verify and troubleshoot the frequency sensor.
•
For
PAROS
sensors:
o
This command continually outputs pressure reading in dbar.
o
If the pressure reading is zero, the connection between the sensor and the processing
electronics may be damaged (or open).
•
For
DRUCK
and
PAROSFREQ
sensors:
o
This command outputs a sample consisting of converted pressure (dbar), temperature
(°C), and raw frequency counts (Hz) in the following format:
Druck Press = 10.03192 Temp = 22.11 Freq = 8055.674
o
The
DRUCK
frequency range (in air) is 7 to 10 kHz; the
PAROSFREQ
is 35 to 38 kHz.
o
If the frequency reading is zero, or is outside the range, the connection between the sen-
sor and processing electronics may be damaged (or open).
o
If the frequency reading is reasonable, but the corresponding pressure is not, this indi-
cates that the appropriate calibration is not loaded into the processor. Section 5 describes
how to load the
DRUCK
calibration.
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