Campbell Scientific SR50-L CSC Ultrasonic Distance Sensor - Manual (Page 30)

SR50 Sonic Ranging Sensor
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7. Assembly/Disassembly Procedures
It is important to follow these instructions to disassemble the SR50.
Disassembly is required to change the Address/Option jumpers and to inspect
or replace the desiccant. There are two small packages of desiccant inside the
transducer housing as well as desiccant inside the electronics enclosure (Refer
to Figure 8).
Before proceeding with any maintenance on a data acquisition
system, always retrieve the data first. It is also recommended
that the datalogger program be saved. If possible, do not open
the SR50 in a field environment.
Do not remove the two Phillips screws which are countersunk
the least. The screws hold the transducer in place. If these
screws are removed, do not over tighten them when
reassembling. Over tightening will cause the transducer to bend.
Apply enough torque only to prevent the washer on the backside
from moving. Ensure that the washer is centered properly over
the backside of the transducer prior to tightening. Inspect the
gold foil of the transducer when complete to ensure that it is not
wrinkled from stress due to over tightening the screws.
IMPORTANT NOTES