Campbell OBS-3A Especificaciones descargar pdf (Pagina 9)

Section 2. Instrument Setup

2.1 Mounting Suggestions

Maximum depth for the OBS-3A housing is 300 meters.

Working depths for individual instruments are limited by the

installed pressure sensor. If exceeded, the pressure

sensor will rupture and the housing will flood.

CAUTION

TABLE 2.1-1. Working and Maximum Depths

Pressure Sensor Working Depth Maximum Depth

0.2 Bar 0 - 2 meters 3 meters

1 Bar 0 - 10 meters 15 meters

5 Bar 0 - 50 meters 75 meters

10 Bar 0 - 100 meters 150 meters

20 Bar 0 - 200 meters 300 meters

(1 Bar = 10 dBar # 10 meters of fresh water)

Schemes for mounting the OBS-3A will vary with applications, however, the

same basic precautions should be followed to ensure the unit is not lost or

damaged.

x The most important general precaution is to orient the unit so that the

OBS sensor “looks” into clear water without reflective surfaces.

x Nearly all exposed parts of the instrument are made of Delrin, a strong but

soft plastic. Always pad the parts of the OBS-3A housing that will

contact metal or other hard objects with electrical tape or neoprene.

Expanded polyethylene tubes make excellent padding.

x Never mount the instrument by the end-caps or attach anything to them.

This could stress the screws holding the unit together, cracking either the

end-caps or pressure housing, and cause a leak.

Moorings

The most convenient means for mounting the unit to a frame or wire is to use

large high-strength nylon cable ties (7.6 mm or 0.3" width) or stainless steel

hose clamps. Use at least six cable ties or two hose clamps for redundancy.

Position the clamps on the inner 2/3rds of the pressure tube, labeled “USE

HOSE CLAMPS HERE”, so stress is not transmitted to the ends (see FIGURE

1-1.). First cover the area(s) to be clamped with tape or 1/16" (2 mm) neoprene

sheet. Clamp the unit to the mounting frame or wire using the padded area.

Do not tighten the hose clamps more than necessary to produce a firm grip.

Over tightening may crack the pressure housing and cause a leak. Use spacer

blocks when necessary to prevent chafing the unit with the frame or wire.

2-1

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Campbell OBS-3A Especificaciones Pagina 9