Using a coupler for bulkhead-mounted sensors

RBR standard instruments can use bulkhead-mounted sensors, some of which are connected via a coupler with two free-spinning flanges designed to tighten and hold the mating MCBH pairs together.

The same coupler connects the Seapoint turbidity sensor in the RBRsolo3 Tu. See Ruskin Instrument Guide: Compact Instruments³ for instructions on coupling the turbidity sensor.
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Fig. 51.    Coupler connecting a bulkhead-mounted sensor to an instrument.
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Fig. 52.    Direction of turn to tighten and loosen the flanges.

Follow the steps outlined below to remove and replace the coupler.

Steps to disconnect and reconnect a sensor

Step Description

1

Disconnect the sensor

  1. Position the instrument vertically, with the sensor end-cap up.

  2. Press the sensor down firmly with your right hand to prevent it from moving and to secure the instrument in its position.

  3. With your left index finger and thumb, twist the flange closest to the instrument counterclockwise until loose.

  4. Remove the disconnected sensor with your right hand.

2

Access the female connector

  1. Twist the flange on the sensor counterclockwise.

  2. Remove the coupler.

3

Lubricate the female connector (see Cables and connectors)

4

Reconnect the sensor

  1. Place the coupler back on the instrument.

  2. Twist clockwise until tight.

  3. Very carefully mate the sensor to the instrument (the pins on the sensor must be aligned with the corresponding holes).

  4. Press the sensor into the instrument to make sure the pins are inserted.

  5. With your right index finger and thumb, twist the right flange counterclockwise while slightly pushing the sensor in with your palm.

  6. Verify the tightness of both flanges.

    Occasionally, one of the flanges may begin to loosen while you are tightening the other one. It usually means that the pins did not mate properly. Carefully align the pins again and press harder. Wiggle the sensor gently to make sure the pins are inserted.