CTD-N Technical Manual
page 78
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
NOTE.
There are two O-rings installed in the O-ring groove on the end cap: a backing O-ring, which has a
flat side and a round side, and a standard round O-ring. As shown below, the backing O-ring is installed
with the flat side facing toward the inside of the housing and the round side facing toward the outside
of the housing. The round O-ring is installed against the round end of the backing O-ring.
Backing and Standard Round O-rings Installed in O-ring Groove
in End Cap
9.
If nicks or scratches are found on an O-
ring, replace it. When replacing the O-ring,
first clean the O-ring surface on the end cap
with a lint-free cloth. Then lightly lubricate
the new O-ring with silicone grease and in-
stall it onto the end cap.
10.
Press the end cap into the housing, be-
ing careful not to pinch the wires.
11.
Spread the band clamp slightly, and
then install it over the end cap and housing
such that it straddles the groove in the
housing and the lip of the end cap, holding
the housing and end cap together.
12.
Latch the band clamp catch, and then
tighten the self-locking nut until it is snug.
Do not over-tighten.
Oil Fill Procedure and Capillary Tube Installation
NOTE.
The following procedure is for units with pressure sensors only.
The pressure sensor used in your instrument is exposed to ambient pressure through a pressure
port and an oil-filled capillary. The oil provides the required pressure coupling and is an electrical
insulator that prevents corrosion due to the dissimilar material compositions of the transducer and
instrument housing.
Included with your instrument is a capillary tube installation kit. The following procedure will pro-
vide guidance to allow you to install the capillary onto the instrument.
Should you require further assistance please do not hesitate to contact Teledyne RD Instruments
and ask to speak to a customer service representative.
