User Manual for the Type 8300 Compatt 6
(and Variants)
UM-8300-Compatt 6
Issue B3
Sensor Type
1
Year
2
Years
Pressure Sensor (strain gauge)
see Section "Pressure Sensor Oil Top-Up" below
X
Pressure Sensor (Digiquartz®); see Sections
8.6.1 "Pressure Sensor Oil Top-Up"
and
"Depth Sensor (Digiquartz®) Recalibration"
.
X
Inclinometer (precision)
X
Inclinometer (MEMS)
X
Temperature, PRT
X
Sound Speed
1
X
Table 8–2 Maintenance and Recalibration Schedule
8.6.1 Pressure Sensor Oil Top-Up
The pressure sensor port (located on the face of the sensor endcap) contains high viscosity silicone oil
behind the red plug. The oil can seep out over time and must be replenished; otherwise sea water may
eventually make contact with the stainless steel pipework of the pressure sensor and corrode it.
A top-up kit is available for this operation, part number 650-0125.
To top up the oil:
1. Place the release endcap upside down.
2. Remove the red pressure port plug using a flat-bladed screwdriver.
3. Fill the syringe with the silicone oil and apply into the pressure port.
Note: the oil will flow best if it is at room temperature.
4. Leave the oil to stand for at least 4 hours to allow any air bubbles to slowly float up out of the oil.
5. Screw the red pressure port plug back in.
To stop the oil from seeping out while in storage, an adhesive label may be fitted over the port. This
must be removed before deployment, or if accurate pressure readings are needed.
8.6.2 Depth Sensor (Digiquartz
®
) Recalibration
The Digiquartz
®
depth sensor is very fragile and has a limited over-range capability. Endcaps that
contain these sensors are supplied with a sheet of calibration coefficients that are needed to convert
the measurements made by the Compatt 6 into an absolute pressure reading.
The manufacturer, Paroscientific Inc. do not provide any method to calibrate the sensor other than
removing small offset errors. This is achieved by recalculating the coefficients C1 and T1.
Under normal conditions a zero adjustment calibration will correct for normal component ageing. This
should be checked annually. A zero offset can be trimmed by re-computing the coefficients supplied
with the sensor (contact Sonardyne Support for details).
Consequently, the only calibration undertaken at Sonardyne involves a single point calibration at
atmospheric pressure, to a limit of 0.01%, using a calibrated barometer to measure the atmospheric
pressure to an accuracy greater than 0.01% FSD.
1
Sound Speed sensor is not recalibrated but is verified against a reference sensor.
Section 8 – Maintenance
33