Pressure Sensor Maintenance; Pump Maintenance - Sea-Bird Electronics SBE 19plusV2 User Manual

Pressure Sensor Maintenance

CAUTION:
Do not put a brush or any object in
the pressure port. Doing so may
damage or break the pressure sensor.
Pressure
sensor
port
Nylon pressure capillary fitting for 19plus V2
with Quartz pressure sensor

Pump Maintenance

Section 5: Routine Maintenance and Calibration
Pressure sensor maintenance varies, depending on the type of pressure sensor
in your SBE 19plus V2.
Strain-Gauge Pressure Sensor
Periodically (approximately once a year) inspect the pressure port for particles
and debris. Rinse the pressure port with warm, de-ionized water to remove any
particles, debris, etc.
Quartz Pressure Sensor
At the factory, the pressure sensor and pressure port were filled with a silicon
oil, and a nylon pressure capillary fitting – which includes a pressure port
fitting and an external capillary tube – were used to retain the oil. The oil
transmits hydrostatic pressure via internal, stainless steel, capillary tubing to
the pressure sensor inside the instrument, and prevents corrosion that might
occur if the sensor diaphragm was exposed to water. The internal tubing and
nylon capillary fitting are vacuum back-filled at the factory.
Because of the viscosity of the silicone oil and capillary action, the silicone oil
does not run out of the external capillary tube. However, due to temperature
and pressure cycling over long periods, it is normal for some oil to slowly leak
out of the external capillary tube. When the oil is not visible or is receding
inside the translucent tube, or if the fitting has been damaged, refill the oil
using the supplied pressure sensor oil refill kit. See Application Note 12-1:
Pressure Port Oil Refill Procedure & Nylon Capillary Fitting Replacement.
See Application Note 75: Maintenance of SBE 5T, 5P, and 5M Pumps.
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