Campbell OBS-3A Manuel télécharger pdf (Page 62)

OBS-3A Turbidity and Temperature Monitoring System

during surveys or after each deployment. A sensor that has been stored dry

should be soaked in water for 15 minutes prior to use.

If the sensor becomes fouled with sediment, oil, or biological material,

conductivity will decline over a period of time indicating cleaning is necessary.

If a water jet fails to remove contaminants, the sensor can be flushed with hot

soapy water or warm alcohol. Do not use solvents. The last step in the

cleaning process should always be to flush with clean water.

9.4 Batteries

The unit runs on three D-size alkaline batteries. Buy the expensive ones with

the most distant pull date (“use before May 2012”). With all sensors installed,

the OBS-3A will run 400 hours in survey mode and for as long as 8000 hours

in one of the logging modes.

Always put OBS-3A to sleep when it will not be used for a

while to conserve battery capacity (see Section 6.12,

Shutdown).

CAUTION

Refer to FIGURE 6-2 for installing batteries. Put the unit on a padded surface

and remove the three screws from the end with the handlebar using the 5/64 in.

hex wrench provided in the spares kit. Grasp the handlebar, turn the sensor end

up and pull the cap straight out of the pressure-housing tube. Immediately

wipe up any water from inside the tube. Stand the unit up on the sensor end

and remove the desiccant bags. Slide the clip away from the batteries until the

spent cells pop up and can be slid out of the tube. Insert fresh batteries in the

tube with the positive terminal (+) up. Press them down and slide the clip over

the batteries until it contacts the tube wall. Replenish the desiccant bags and

clean and regrease the O-ring. Replace the end cap.

Do not over tighten the screws.

CAUTION

Battery life will depend on the percentage of time the unit is sampling.

TABLE 9-1 shows battery life as a function of sample duration and interval to

assist with planning your setup. Pick a power-efficient sampling schedule that

meets your scientific objectives.

TABLE 9-1. Battery Life (Hours)

Interval

120

256

1024

(Sec.)

100% 50% 100% 50% 100% 10% 100% 10%

1300 NO NO NO NO NO NO NO

600

> 8000 5450 2080 3150 1100 1460 530 NO

900

> 8000 > 8000 2970 5450 1600 2110 785 NO

1800

> 8000 > 8000 5160 > 8000 2950 3815 1510 1120

3600

> 8000 > 8000 > 8000 > 8000 5150 6400 2810 2110

Duration in seconds (% Power)

NO = Not possible; 1 = All sensors; 2 = OBS & depth sensors; 3 = Wave calculations.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 71 72

Commentaires sur ces manuels

Pas de commentaire

Campbell OBS-3A Manuel Page 62

Commentaires sur ces manuels

Produits connexes et manuels pour Mesure, test et contrôle Campbell OBS-3A