Summary of Response Times for Moored Applications
The first plot below is derived from the preceding plot and may be used to determine the time required from power-
up and pump turn-on to the availability of an acceptable dissolved oxygen sample with a 0.5-mil membrane. For
simplicity, we generally recommend a minimum pump time of 15 seconds for 15 °C and warmer water, and
reference the 1% curve below for colder water.
• Example – SBE 16plus with SBE 43 with 0.5-mil membrane:
If working in 20 °C water and wanting oxygen data to within 1% of actual oxygen concentrations, pump time of at
least 11 seconds is required. Set the SBE 16plus to pump during the entire sample (PumpMode=2) *, and set the
delay before sampling to 15 seconds (DelayBeforeSampling=15) *. We have allowed an extra 4 seconds of pump
time; this ensures that the sample will still be good if the SBE 16plus is in colder than expected water. Note that
longer pump times reduce battery endurance.
* See the appropriate CTD manual for the exact format of these commands; they vary, depending on the product and the
telemetry interface.
The next plot was derived in a similar fashion, and may be used to determine the time required from power-up and
pump turn-on to the availability of an acceptable dissolved oxygen sample with a 1.0-mil membrane. For simplicity,
we generally recommend a minimum pump time of 25 seconds for 15 °C and warmer water, and reference the
1% curve below for colder water.
0
5
10
15
20
25
30
0 10203040
Temperature in Degrees C
Time in Seconds
Time to 1% of final value
Time to 5% of final value
To 1% of final value
To 5% of final value
Summary of Response Times for 0.5-mil Membrane
To 1% of final value
To 5% of final value
Summary of Response Times for 1.0-mil Membrane
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