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. Follow the steps outlined below to remove the coupler.

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The same coupler connects the turbidity sensor in the RBRsolo³ Tu. See the RBR instrument guide for compact instruments for instructions on coupling the turbidity sensor.

Steps

Step	Description
1	Disconnect the sensor Position the instrument vertically, with the sensor end-cap up. Press the sensor down firmly with your right hand to prevent it from moving and to secure the instrument in its position. With your left index finger and thumb, twist the flange closest to the instrument counterclockwise until loose. Remove the disconnected sensor with your right hand.
2	Access the female connector Twist the flange on the sensor counterclockwise. Remove the coupler.
3	Lubricate the female connector (see Underwater connector maintenance)
4	Reconnect the sensor Place the coupler back on the instrument. Twist clockwise until tight. Very carefully mate the sensor to the instrument (the pins on the sensor must be aligned with the corresponding holes). Press the sensor into the instrument to make sure the pins are inserted. With your right index finger and thumb, twist the right flange counterclockwise while slightly pushing the sensor in with your palm. 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. .