November 5, 2010
Rev1.4
48
Using an underwater connector
Some loggers are equipped with an Impulse MSSJ series underwater connector. This
connector makes it possible to program and retrieve data from the logger while it is
underwater. Please refer to the Real-time display section of the manual on page 18 for
more information about live data collection.
An optional RS485 interface allows for use of cables over 1km long.
To establish a connection, press the cable plug into the bulkhead receptacle and tighten the
stainless steel connector. Please see the note below for precautions regarding the O-rings.
O-ring specifications may be found in Appendix B on page 53.
Recent loggers are equipped with IE55 connectors and the following guidelines are
provided:
Lubricate mating surfaces with 3M Silicone Spray or equivalent. DO NOT GREASE.
Connectors must be lubricated on a regular basis.
IE55-1200 contact surfaces must be dry prior to mating.
Lubricate O-rings with Dow Corning #111 Valve Lubricant or equivalent.
Keep O-ring grooves clean and avoid cuts and nicks in the O-ring. Replace O-rings when
re-mounting connectors.
Avoid contact with solvents.
Avoid sharp bends at cable entry to connector.
Elastomers can be seriously degraded if exposed to direct sunlight or high ozone levels for
extended periods of time.
Note:
The seal for the underwater connection depends upon two O-
rings: one is attached to the connector and the other to the
bulkhead. There are two common difficulties relating to these O-
rings:
1. If the O-ring on the plug is not well greased, then the
alignment recess can cut the O-ring. Greasing the O-ring
before connecting the plug to the socket will prevent this
from happening.
2. The O-ring at the bottom of the receptacle is easily lost. It
is specially made for Impulse and has a non-standard
size. Replacements may be obtained, but the cost is
nearly five times that of a standard O-ring of similar size.
Do not lose this O-ring. If you do, contact RBR for a
replacement.