Sea-Bird Electronics SBE 38 Bedienungsanleitung PDF herunterladen (Seite 35)

Manual revision 006 Section 4: Deploying and Operating SBE 19plus V2 SBE 19plus V2

Moored Mode Pump Setting Recommendations

Sea-Bird provides the following recommendations for pump settings. Note that

longer pump times increase power usage, reducing battery endurance.

See Battery Endurance in Section 2: Description of SBE 19plus V2 for sample

battery endurance calculations.

Pump through Conductivity Cell Only

For most deployments, set MooredPumpMode=1 and

DelayBeforeSampling=0. The pump operates for 0.5 seconds before the

conductivity measurement is made, providing enough time to ventilate the cell

and bring in a new sample of water.

If the 19plus V2 is moored in an area with large thermal gradients, it may be

necessary to pump for a longer period of time, to eliminate any cell thermal

mass effects on the measurement. In this case, set MooredPumpMode=2 and

set DelayBeforeSampling= to a non-zero value, providing additional

ventilation time (allowing the conductivity cell temperature to equilibrate to

the water temperature) before taking the measurement.

Pump through Conductivity Cell and SBE 43 Dissolved Oxygen Sensor

Set MooredPumpMode=2.

As the pump brings new water into the SBE 43 plenum, some time is required

for the sensor to equilibrate to the new oxygen level. The time required is

dependent on the sensor’s membrane thickness, and on the water temperature.

Prior to 2007, all SBE 43s were sold with a 0.5 mil thick membrane.

Beginning in 2007, Sea-Bird began offering two membrane thicknesses –

0.5 mil (faster response, typically for profiling applications) and

1.0 mil (slower response but more durable, typically for moored applications).

• For a 0.5 mil thick membrane – Recommended DelayBeforeSampling=

varies in a non-linear fashion, from 15 seconds at 15 °C to 30 seconds at

0 °C.

• For a 1.0 mil thick membrane – Recommended DelayBeforeSampling=

varies in a non-linear fashion, from 25 seconds at 15 °C to 40 seconds at

0 °C.

Pump through Conductivity Cell and Beckman- or YSI-type

Dissolved Oxygen Sensor

Set MooredPumpMode=2. Set DelayBeforeSampling= to

120 to 180 seconds, allowing time for the oxygen sensor to polarize before

taking the measurement.

Note:

See Application Note 64: SBE 43

Dissolved Oxygen Sensor –

Background Information, Deployment

Recommendations, and Cleaning and

Storage for the response time curves.

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Sea-Bird Electronics SBE 38 Bedienungsanleitung Seite 35