Model 865-A Deep Sea Acoustic Release/Transponder M-855-009
Benthos, Inc.
4
2.0 GENERAL DESCRIPTION
The Model 865-A Acoustic Release is supplied to the customer as follows. The customer should
check the shipment upon receipt to be sure the order is received complete and undamaged. Please
contact Benthos before returning any equipment damaged in shipment.
a. Model 865-A Acoustic Release/Transponder unit
b. Model 865-SL (Spare Link)
c. Spare Parts Kit 865-A-SPK (see Section 9)
d. Instruction Manual.
2.1 Construction (see Figure 2–1)
The Model 865-A consists of a transducer, electronics assembly, power pack and release assembly,
contained in a stainless steel housing.
The electronics, battery and release assembly can be withdrawn as one assembly by simply removing
the two stainless steel nuts and pulling on the end cap. The internal connection to the transducer at the
other end is automatically broken when the assembly is withdrawn, and remade when the assembly is
inserted.
When withdrawn, it can be seen that the release mechanism takes up about one third of the assembly,
the electronics and battery, the remainder. The electronics/battery section can be separated from the
release mechanism by removal of two No. 10-32 stainless steel nuts found on the opposite side of the
release mechanism mounting plate.
The electronics are protected by the short aluminum tube nearest the transducer connector. The circuit
boards may be exposed by simply removing two 1/4-20 flathead screws on the end plate, removing the
plate and sliding off the tube (see Figure 2-1).
There are two circuit boards back to back, separated by four spacers and a connector. They are:
a. 865 Board No. 1, Driver Board, C-855-130 (with largest components)
b. 865 Board No. 2, Logic Board, C-855-132.
The stainless steel housing consists of the tubing, a mooring eye, protective rails for the transducer, two
padeyes for attachment of other equipment and an end cap for the release mechanism. A 1018 carbon
steel sacrificial anode is mounted to the housing for corrosion protection (reference Drawing B-855-81,
Instructions for Anode Installation). Most of the external surface of the housing is painted to reduce the
exposed surface area.
NOTE: Minor scrapes or chips in the paint are not a problem as long as the anodes are properly
installed.
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