![Sea-Bird Scientific SBE 25plus Скачать руководство пользователя страница 30](http://html.mh-extra.com/html/sea-bird-scientific/sbe-25plus/sbe-25plus_user-manual_1221400030.webp)
to put other sensors on the system so that they do not thermally contaminate the water
that flows to the sensors and the T-C Duct inlet.
If the water temperature at the deployment is very different from the temperature at which
the 25plus has been stored, let it sit near the surface of the water for 3–5 minutes and
then start the profile. This will reduce the thermal effect of the sensor housing on the
water that enters the cell.
When heavy seas cause dangerous ship motion, the 25plus descent may stop or go in
the opposite direction if the ship heaves upward faster than the system can descend. This
can cause loops in the real-time temperature trace. In addition, if the winch payout rate is
too fast, a loop of wire can form under water when the descent is slowed or stopped by
ship heave but the winch has not stopped. The loop gets out of phase with the heave and
closes on itself, which causes a kink. It is not easy to detect a loop in the cable when
there is 1000–2000 m of cable in the water. Systems with water samplers have more drag
than only the 25plus, so the possibility of a loop is greater. If 100–200 kg of weight are
added, the effect of drag will be reduced. The system will descend faster and stay in line
below the overboarding sheave.
"Spiking" is caused by a response time mismatch of conductivity and temperature
measurements, when the descent rate in not constant. Most spikes are removed when
the data is synchronized in time. Use the Data Processing software to align data more
precisely. A data set can be improved if the user removes the data collected when the
pressure did not increase.
5.6 Recover 25plus from deployment
W A R N I N G
If the user thinks that the alkaline batteries have leaks, pressure may have built up inside of the
pressure housing. Follow ESD protocols to release internal pressure. Put on safety glasses and
protective gloves and make sure that the sensor is pointed away from the body and other people.
In a well ventilated very SLOWLY loosen the bulkhead connector to release the pressure. Keep
away from heat, sparks, flame, and other sources of ignition. Do not smoke.
W A R N I N G
If the user thinks that a sensor has water in the pressure housing: Disconnect the sensor from any
power supply. Put on safety glasses and make sure that the sensor is pointed away from the body
and other people. In a well ventilated area, use the purge port (if the sensor is so equipped), or
very SLOWLY loosen the bulkhead connector to let the pressure release.
N O T I C E
To SLOWLY remove the bulkhead connector: loosen one bulkhead connector by 1 turn to open
the O-ring seal under the connector. If there is internal pressure, water may leak out or you may
hear a hiss. Let the pressure bleed off slowly. Then it will be safe to remove the end flange.
To stop operation and thus data collection, pull the plunger switch out, to the Off position,
or send the Stop command from a terminal program. The 25plus goes into a low power
mode.
1.
Flush the conductivity cell with fresh water.
2.
If the batteries have no charge, install new ones to transmit the stored data from the
25plus to a PC.
3.
If the 25plus will not be deployed again immediately, send the QA command to put
the 25plus into a low power mode.
4.
Remove the battery pack from the 25plus. The current draw in this mode is 70 µA,
which is supplied by the lithium ion coin battery.
Deployment and recovery
28
Содержание SBE 25plus
Страница 2: ......
Страница 6: ...SBE 25plus quick start guide 4 ...
Страница 12: ...Figure 4 SBE 32 Figure 5 SBE 36 Overview 10 ...
Страница 14: ...Figure 8 SBE 55 Overview 12 ...
Страница 22: ...Set up sensor and verify operation 20 ...
Страница 60: ...Serial sensor integration 58 ...
Страница 64: ...General information 62 ...
Страница 65: ......