Campbell OBS-3A Especificaciones descargar pdf (Pagina 10)

Section 2. Instrument Setup

Surveys

The OBS-3A will usually be towed from a cable harness for surveys. The

serial cable supplied with the unit is strong enough to tow the OBS-3A and a

5-kg depressor weight however; the towing forces must be transmitted to the

pressure housing and not to the connector. To provide strain relief for the

connector, attach a cable grip about 30 cm above the SUBCONN

connector

(FIGURE 1-2) and attach a short length of 1/8" (3 mm) wire rope to the cable

grip. Clamp the wire rope to the pressure housing in the clamping area with

two stainless steel hose clamps. Provide a small loop of slack cable between

the cable grip and connector and put chafe protection on the sensor head where

it contacts the wire rope.

2.2 Battery Installation

If unit is wet, perform the following operations with the unit held sensor end

up. Remove the three hex screws from the end with the handle and pull the cap

down and out of the housing. Use caution if you have significantly changed

elevation since the OBS-3A may be under pressure and the cap could pop out.

Then wipe water from inside walls of the tube with a paper towel (FIGURE

2.2-1). Slide the battery clip back and insert the batteries with the positive

terminal (+) toward the clip. Push the batteries down and slide the clip against

the housing wall to hold them in place. Inspect the o-ring in the cap and

replace the cap and screws.

FIGURE 2.2-1. Battery Installation

2-2

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Campbell OBS-3A Especificaciones Pagina 10